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qt5base-lts/src/opengl/qgl.cpp
Giuseppe D'Angelo 779e2f38ea QtOpenGL: remove \link usages 
Change-Id: I34509eaf87a91bf31a78b08c91d9a57e704d8989
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>
2012-05-29 11:35:21 +02:00

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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qapplication.h"
#include "qplatformdefs.h"
#include "qgl.h"
#include <qdebug.h>
#include <qglfunctions.h>
#include <qdatetime.h>
#include <stdlib.h> // malloc
#include "qpixmap.h"
#include "qimage.h"
#include "qgl_p.h"
#include "gl2paintengineex/qpaintengineex_opengl2_p.h"
#include <qpa/qplatformopenglcontext.h>
#include <qglpixelbuffer.h>
#include <qglframebufferobject.h>
#include <private/qimage_p.h>
#include <qpa/qplatformpixmap.h>
#include <private/qglpixelbuffer_p.h>
#include <private/qimagepixmapcleanuphooks_p.h>
#include "qcolormap.h"
#include "qfile.h"
#include "qlibrary.h"
#include <qmutex.h>
// #define QT_GL_CONTEXT_RESOURCE_DEBUG
QT_BEGIN_NAMESPACE
QGLExtensionFuncs QGLContextPrivate::qt_extensionFuncs;
struct QGLThreadContext {
~QGLThreadContext() {
if (context)
context->doneCurrent();
}
QGLContext *context;
};
Q_GLOBAL_STATIC(QGLFormat, qgl_default_format)
class QGLDefaultOverlayFormat: public QGLFormat
{
public:
inline QGLDefaultOverlayFormat()
{
setOption(QGL::FormatOption(0xffff << 16)); // turn off all options
setOption(QGL::DirectRendering);
setPlane(1);
}
};
Q_GLOBAL_STATIC(QGLDefaultOverlayFormat, defaultOverlayFormatInstance)
Q_GLOBAL_STATIC(QGLSignalProxy, theSignalProxy)
QGLSignalProxy *QGLSignalProxy::instance()
{
QGLSignalProxy *proxy = theSignalProxy();
if (proxy && proxy->thread() != qApp->thread()) {
if (proxy->thread() == QThread::currentThread())
proxy->moveToThread(qApp->thread());
}
return proxy;
}
/*!
\namespace QGL
\inmodule QtOpenGL
\brief The QGL namespace specifies miscellaneous identifiers used
in the Qt OpenGL module.
\ingroup painting-3D
*/
/*!
\enum QGL::FormatOption
This enum specifies the format options that can be used to configure an OpenGL
context. These are set using QGLFormat::setOption().
\value DoubleBuffer Specifies the use of double buffering.
\value DepthBuffer Enables the use of a depth buffer.
\value Rgba Specifies that the context should use RGBA as its pixel format.
\value AlphaChannel Enables the use of an alpha channel.
\value AccumBuffer Enables the use of an accumulation buffer.
\value StencilBuffer Enables the use of a stencil buffer.
\value StereoBuffers Enables the use of a stereo buffers for use with visualization hardware.
\value DirectRendering Specifies that the context is used for direct rendering to a display.
\value HasOverlay Enables the use of an overlay.
\value SampleBuffers Enables the use of sample buffers.
\value DeprecatedFunctions Enables the use of deprecated functionality for OpenGL 3.x
contexts. A context with deprecated functionality enabled is
called a full context in the OpenGL specification.
\value SingleBuffer Specifies the use of a single buffer, as opposed to double buffers.
\value NoDepthBuffer Disables the use of a depth buffer.
\value ColorIndex Specifies that the context should use a color index as its pixel format.
\value NoAlphaChannel Disables the use of an alpha channel.
\value NoAccumBuffer Disables the use of an accumulation buffer.
\value NoStencilBuffer Disables the use of a stencil buffer.
\value NoStereoBuffers Disables the use of stereo buffers.
\value IndirectRendering Specifies that the context is used for indirect rendering to a buffer.
\value NoOverlay Disables the use of an overlay.
\value NoSampleBuffers Disables the use of sample buffers.
\value NoDeprecatedFunctions Disables the use of deprecated functionality for OpenGL 3.x
contexts. A context with deprecated functionality disabled is
called a forward compatible context in the OpenGL specification.
\sa {Sample Buffers Example}
*/
/*****************************************************************************
QGLFormat implementation
*****************************************************************************/
/*!
\class QGLFormat
\brief The QGLFormat class specifies the display format of an OpenGL
rendering context.
\ingroup painting-3D
A display format has several characteristics:
\list
\li \l{setDoubleBuffer()}{Double or single buffering.}
\li \l{setDepth()}{Depth buffer.}
\li \l{setRgba()}{RGBA or color index mode.}
\li \l{setAlpha()}{Alpha channel.}
\li \l{setAccum()}{Accumulation buffer.}
\li \l{setStencil()}{Stencil buffer.}
\li \l{setStereo()}{Stereo buffers.}
\li \l{setDirectRendering()}{Direct rendering.}
\li \l{setOverlay()}{Presence of an overlay.}
\li \l{setPlane()}{Plane of an overlay.}
\li \l{setSampleBuffers()}{Multisample buffers.}
\endlist
You can also specify preferred bit depths for the color buffer,
depth buffer, alpha buffer, accumulation buffer and the stencil
buffer with the functions: setRedBufferSize(), setGreenBufferSize(),
setBlueBufferSize(), setDepthBufferSize(), setAlphaBufferSize(),
setAccumBufferSize() and setStencilBufferSize().
Note that even if you specify that you prefer a 32 bit depth
buffer (e.g. with setDepthBufferSize(32)), the format that is
chosen may not have a 32 bit depth buffer, even if there is a
format available with a 32 bit depth buffer. The main reason for
this is how the system dependant picking algorithms work on the
different platforms, and some format options may have higher
precedence than others.
You create and tell a QGLFormat object what rendering options you
want from an OpenGL rendering context.
OpenGL drivers or accelerated hardware may or may not support
advanced features such as alpha channel or stereographic viewing.
If you request some features that the driver/hardware does not
provide when you create a QGLWidget, you will get a rendering
context with the nearest subset of features.
There are different ways to define the display characteristics of
a rendering context. One is to create a QGLFormat and make it the
default for the entire application:
\snippet code/src_opengl_qgl.cpp 0
Or you can specify the desired format when creating an object of
your QGLWidget subclass:
\snippet code/src_opengl_qgl.cpp 1
After the widget has been created, you can find out which of the
requested features the system was able to provide:
\snippet code/src_opengl_qgl.cpp 2
\legalese
OpenGL is a trademark of Silicon Graphics, Inc. in the
United States and other countries.
\endlegalese
\sa QGLContext, QGLWidget
*/
#ifndef QT_OPENGL_ES
static inline void transform_point(GLdouble out[4], const GLdouble m[16], const GLdouble in[4])
{
#define M(row,col) m[col*4+row]
out[0] =
M(0, 0) * in[0] + M(0, 1) * in[1] + M(0, 2) * in[2] + M(0, 3) * in[3];
out[1] =
M(1, 0) * in[0] + M(1, 1) * in[1] + M(1, 2) * in[2] + M(1, 3) * in[3];
out[2] =
M(2, 0) * in[0] + M(2, 1) * in[1] + M(2, 2) * in[2] + M(2, 3) * in[3];
out[3] =
M(3, 0) * in[0] + M(3, 1) * in[1] + M(3, 2) * in[2] + M(3, 3) * in[3];
#undef M
}
static inline GLint qgluProject(GLdouble objx, GLdouble objy, GLdouble objz,
const GLdouble model[16], const GLdouble proj[16],
const GLint viewport[4],
GLdouble * winx, GLdouble * winy, GLdouble * winz)
{
GLdouble in[4], out[4];
in[0] = objx;
in[1] = objy;
in[2] = objz;
in[3] = 1.0;
transform_point(out, model, in);
transform_point(in, proj, out);
if (in[3] == 0.0)
return GL_FALSE;
in[0] /= in[3];
in[1] /= in[3];
in[2] /= in[3];
*winx = viewport[0] + (1 + in[0]) * viewport[2] / 2;
*winy = viewport[1] + (1 + in[1]) * viewport[3] / 2;
*winz = (1 + in[2]) / 2;
return GL_TRUE;
}
#endif // !QT_OPENGL_ES
/*!
Constructs a QGLFormat object with the following default settings:
\list
\li \l{setDoubleBuffer()}{Double buffer:} Enabled.
\li \l{setDepth()}{Depth buffer:} Enabled.
\li \l{setRgba()}{RGBA:} Enabled (i.e., color index disabled).
\li \l{setAlpha()}{Alpha channel:} Disabled.
\li \l{setAccum()}{Accumulator buffer:} Disabled.
\li \l{setStencil()}{Stencil buffer:} Enabled.
\li \l{setStereo()}{Stereo:} Disabled.
\li \l{setDirectRendering()}{Direct rendering:} Enabled.
\li \l{setOverlay()}{Overlay:} Disabled.
\li \l{setPlane()}{Plane:} 0 (i.e., normal plane).
\li \l{setSampleBuffers()}{Multisample buffers:} Disabled.
\endlist
*/
QGLFormat::QGLFormat()
{
d = new QGLFormatPrivate;
}
/*!
Creates a QGLFormat object that is a copy of the current
defaultFormat().
If \a options is not 0, the default format is modified by the
specified format options. The \a options parameter should be
QGL::FormatOption values OR'ed together.
This constructor makes it easy to specify a certain desired format
in classes derived from QGLWidget, for example:
\snippet code/src_opengl_qgl.cpp 3
Note that there are QGL::FormatOption values to turn format settings
both on and off, e.g. QGL::DepthBuffer and QGL::NoDepthBuffer,
QGL::DirectRendering and QGL::IndirectRendering, etc.
The \a plane parameter defaults to 0 and is the plane which this
format should be associated with. Not all OpenGL implementations
supports overlay/underlay rendering planes.
\sa defaultFormat(), setOption(), setPlane()
*/
QGLFormat::QGLFormat(QGL::FormatOptions options, int plane)
{
d = new QGLFormatPrivate;
QGL::FormatOptions newOpts = options;
d->opts = defaultFormat().d->opts;
d->opts |= (newOpts & 0xffff);
d->opts &= ~(newOpts >> 16);
d->pln = plane;
}
/*!
\internal
*/
void QGLFormat::detach()
{
if (d->ref.load() != 1) {
QGLFormatPrivate *newd = new QGLFormatPrivate(d);
if (!d->ref.deref())
delete d;
d = newd;
}
}
/*!
Constructs a copy of \a other.
*/
QGLFormat::QGLFormat(const QGLFormat &other)
{
d = other.d;
d->ref.ref();
}
/*!
Assigns \a other to this object.
*/
QGLFormat &QGLFormat::operator=(const QGLFormat &other)
{
if (d != other.d) {
other.d->ref.ref();
if (!d->ref.deref())
delete d;
d = other.d;
}
return *this;
}
/*!
Destroys the QGLFormat.
*/
QGLFormat::~QGLFormat()
{
if (!d->ref.deref())
delete d;
}
/*!
\fn bool QGLFormat::doubleBuffer() const
Returns true if double buffering is enabled; otherwise returns
false. Double buffering is enabled by default.
\sa setDoubleBuffer()
*/
/*!
If \a enable is true sets double buffering; otherwise sets single
buffering.
Double buffering is enabled by default.
Double buffering is a technique where graphics are rendered on an
off-screen buffer and not directly to the screen. When the drawing
has been completed, the program calls a swapBuffers() function to
exchange the screen contents with the buffer. The result is
flicker-free drawing and often better performance.
Note that single buffered contexts are currently not supported
with EGL.
\sa doubleBuffer(), QGLContext::swapBuffers(),
QGLWidget::swapBuffers()
*/
void QGLFormat::setDoubleBuffer(bool enable)
{
setOption(enable ? QGL::DoubleBuffer : QGL::SingleBuffer);
}
/*!
\fn bool QGLFormat::depth() const
Returns true if the depth buffer is enabled; otherwise returns
false. The depth buffer is enabled by default.
\sa setDepth(), setDepthBufferSize()
*/
/*!
If \a enable is true enables the depth buffer; otherwise disables
the depth buffer.
The depth buffer is enabled by default.
The purpose of a depth buffer (or Z-buffering) is to remove hidden
surfaces. Pixels are assigned Z values based on the distance to
the viewer. A pixel with a high Z value is closer to the viewer
than a pixel with a low Z value. This information is used to
decide whether to draw a pixel or not.
\sa depth(), setDepthBufferSize()
*/
void QGLFormat::setDepth(bool enable)
{
setOption(enable ? QGL::DepthBuffer : QGL::NoDepthBuffer);
}
/*!
\fn bool QGLFormat::rgba() const
Returns true if RGBA color mode is set. Returns false if color
index mode is set. The default color mode is RGBA.
\sa setRgba()
*/
/*!
If \a enable is true sets RGBA mode. If \a enable is false sets
color index mode.
The default color mode is RGBA.
RGBA is the preferred mode for most OpenGL applications. In RGBA
color mode you specify colors as red + green + blue + alpha
quadruplets.
In color index mode you specify an index into a color lookup
table.
\sa rgba()
*/
void QGLFormat::setRgba(bool enable)
{
setOption(enable ? QGL::Rgba : QGL::ColorIndex);
}
/*!
\fn bool QGLFormat::alpha() const
Returns true if the alpha buffer in the framebuffer is enabled;
otherwise returns false. The alpha buffer is disabled by default.
\sa setAlpha(), setAlphaBufferSize()
*/
/*!
If \a enable is true enables the alpha buffer; otherwise disables
the alpha buffer.
The alpha buffer is disabled by default.
The alpha buffer is typically used for implementing transparency
or translucency. The A in RGBA specifies the transparency of a
pixel.
\sa alpha(), setAlphaBufferSize()
*/
void QGLFormat::setAlpha(bool enable)
{
setOption(enable ? QGL::AlphaChannel : QGL::NoAlphaChannel);
}
/*!
\fn bool QGLFormat::accum() const
Returns true if the accumulation buffer is enabled; otherwise
returns false. The accumulation buffer is disabled by default.
\sa setAccum(), setAccumBufferSize()
*/
/*!
If \a enable is true enables the accumulation buffer; otherwise
disables the accumulation buffer.
The accumulation buffer is disabled by default.
The accumulation buffer is used to create blur effects and
multiple exposures.
\sa accum(), setAccumBufferSize()
*/
void QGLFormat::setAccum(bool enable)
{
setOption(enable ? QGL::AccumBuffer : QGL::NoAccumBuffer);
}
/*!
\fn bool QGLFormat::stencil() const
Returns true if the stencil buffer is enabled; otherwise returns
false. The stencil buffer is enabled by default.
\sa setStencil(), setStencilBufferSize()
*/
/*!
If \a enable is true enables the stencil buffer; otherwise
disables the stencil buffer.
The stencil buffer is enabled by default.
The stencil buffer masks certain parts of the drawing area so that
masked parts are not drawn on.
\sa stencil(), setStencilBufferSize()
*/
void QGLFormat::setStencil(bool enable)
{
setOption(enable ? QGL::StencilBuffer: QGL::NoStencilBuffer);
}
/*!
\fn bool QGLFormat::stereo() const
Returns true if stereo buffering is enabled; otherwise returns
false. Stereo buffering is disabled by default.
\sa setStereo()
*/
/*!
If \a enable is true enables stereo buffering; otherwise disables
stereo buffering.
Stereo buffering is disabled by default.
Stereo buffering provides extra color buffers to generate left-eye
and right-eye images.
\sa stereo()
*/
void QGLFormat::setStereo(bool enable)
{
setOption(enable ? QGL::StereoBuffers : QGL::NoStereoBuffers);
}
/*!
\fn bool QGLFormat::directRendering() const
Returns true if direct rendering is enabled; otherwise returns
false.
Direct rendering is enabled by default.
\sa setDirectRendering()
*/
/*!
If \a enable is true enables direct rendering; otherwise disables
direct rendering.
Direct rendering is enabled by default.
Enabling this option will make OpenGL bypass the underlying window
system and render directly from hardware to the screen, if this is
supported by the system.
\sa directRendering()
*/
void QGLFormat::setDirectRendering(bool enable)
{
setOption(enable ? QGL::DirectRendering : QGL::IndirectRendering);
}
/*!
\fn bool QGLFormat::sampleBuffers() const
Returns true if multisample buffer support is enabled; otherwise
returns false.
The multisample buffer is disabled by default.
\sa setSampleBuffers()
*/
/*!
If \a enable is true, a GL context with multisample buffer support
is picked; otherwise ignored.
\sa sampleBuffers(), setSamples(), samples()
*/
void QGLFormat::setSampleBuffers(bool enable)
{
setOption(enable ? QGL::SampleBuffers : QGL::NoSampleBuffers);
}
/*!
Returns the number of samples per pixel when multisampling is
enabled. By default, the highest number of samples that is
available is used.
\sa setSampleBuffers(), sampleBuffers(), setSamples()
*/
int QGLFormat::samples() const
{
return d->numSamples;
}
/*!
Set the preferred number of samples per pixel when multisampling
is enabled to \a numSamples. By default, the highest number of
samples available is used.
\sa setSampleBuffers(), sampleBuffers(), samples()
*/
void QGLFormat::setSamples(int numSamples)
{
detach();
if (numSamples < 0) {
qWarning("QGLFormat::setSamples: Cannot have negative number of samples per pixel %d", numSamples);
return;
}
d->numSamples = numSamples;
setSampleBuffers(numSamples > 0);
}
/*!
\since 4.2
Set the preferred swap interval. This can be used to sync the GL
drawing into a system window to the vertical refresh of the screen.
Setting an \a interval value of 0 will turn the vertical refresh syncing
off, any value higher than 0 will turn the vertical syncing on.
Under Windows and under X11, where the \c{WGL_EXT_swap_control}
and \c{GLX_SGI_video_sync} extensions are used, the \a interval
parameter can be used to set the minimum number of video frames
that are displayed before a buffer swap will occur. In effect,
setting the \a interval to 10, means there will be 10 vertical
retraces between every buffer swap.
Under Windows the \c{WGL_EXT_swap_control} extension has to be present,
and under X11 the \c{GLX_SGI_video_sync} extension has to be present.
*/
void QGLFormat::setSwapInterval(int interval)
{
detach();
d->swapInterval = interval;
}
/*!
\since 4.2
Returns the currently set swap interval. -1 is returned if setting
the swap interval isn't supported in the system GL implementation.
*/
int QGLFormat::swapInterval() const
{
return d->swapInterval;
}
/*!
\fn bool QGLFormat::hasOverlay() const
Returns true if overlay plane is enabled; otherwise returns false.
Overlay is disabled by default.
\sa setOverlay()
*/
/*!
If \a enable is true enables an overlay plane; otherwise disables
the overlay plane.
Enabling the overlay plane will cause QGLWidget to create an
additional context in an overlay plane. See the QGLWidget
documentation for further information.
\sa hasOverlay()
*/
void QGLFormat::setOverlay(bool enable)
{
setOption(enable ? QGL::HasOverlay : QGL::NoOverlay);
}
/*!
Returns the plane of this format. The default for normal formats
is 0, which means the normal plane. The default for overlay
formats is 1, which is the first overlay plane.
\sa setPlane(), defaultOverlayFormat()
*/
int QGLFormat::plane() const
{
return d->pln;
}
/*!
Sets the requested plane to \a plane. 0 is the normal plane, 1 is
the first overlay plane, 2 is the second overlay plane, etc.; -1,
-2, etc. are underlay planes.
Note that in contrast to other format specifications, the plane
specifications will be matched exactly. This means that if you
specify a plane that the underlying OpenGL system cannot provide,
an \l{QGLWidget::isValid()}{invalid} QGLWidget will be
created.
\sa plane()
*/
void QGLFormat::setPlane(int plane)
{
detach();
d->pln = plane;
}
/*!
Sets the format option to \a opt.
\sa testOption()
*/
void QGLFormat::setOption(QGL::FormatOptions opt)
{
detach();
if (opt & 0xffff)
d->opts |= opt;
else
d->opts &= ~(opt >> 16);
}
/*!
Returns true if format option \a opt is set; otherwise returns false.
\sa setOption()
*/
bool QGLFormat::testOption(QGL::FormatOptions opt) const
{
if (opt & 0xffff)
return (d->opts & opt) != 0;
else
return (d->opts & (opt >> 16)) == 0;
}
/*!
Set the minimum depth buffer size to \a size.
\sa depthBufferSize(), setDepth(), depth()
*/
void QGLFormat::setDepthBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setDepthBufferSize: Cannot set negative depth buffer size %d", size);
return;
}
d->depthSize = size;
setDepth(size > 0);
}
/*!
Returns the depth buffer size.
\sa depth(), setDepth(), setDepthBufferSize()
*/
int QGLFormat::depthBufferSize() const
{
return d->depthSize;
}
/*!
\since 4.2
Set the preferred red buffer size to \a size.
\sa setGreenBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setRedBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setRedBufferSize: Cannot set negative red buffer size %d", size);
return;
}
d->redSize = size;
}
/*!
\since 4.2
Returns the red buffer size.
\sa setRedBufferSize()
*/
int QGLFormat::redBufferSize() const
{
return d->redSize;
}
/*!
\since 4.2
Set the preferred green buffer size to \a size.
\sa setRedBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setGreenBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setGreenBufferSize: Cannot set negative green buffer size %d", size);
return;
}
d->greenSize = size;
}
/*!
\since 4.2
Returns the green buffer size.
\sa setGreenBufferSize()
*/
int QGLFormat::greenBufferSize() const
{
return d->greenSize;
}
/*!
\since 4.2
Set the preferred blue buffer size to \a size.
\sa setRedBufferSize(), setGreenBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setBlueBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setBlueBufferSize: Cannot set negative blue buffer size %d", size);
return;
}
d->blueSize = size;
}
/*!
\since 4.2
Returns the blue buffer size.
\sa setBlueBufferSize()
*/
int QGLFormat::blueBufferSize() const
{
return d->blueSize;
}
/*!
Set the preferred alpha buffer size to \a size.
This function implicitly enables the alpha channel.
\sa setRedBufferSize(), setGreenBufferSize(), alphaBufferSize()
*/
void QGLFormat::setAlphaBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setAlphaBufferSize: Cannot set negative alpha buffer size %d", size);
return;
}
d->alphaSize = size;
setAlpha(size > 0);
}
/*!
Returns the alpha buffer size.
\sa alpha(), setAlpha(), setAlphaBufferSize()
*/
int QGLFormat::alphaBufferSize() const
{
return d->alphaSize;
}
/*!
Set the preferred accumulation buffer size, where \a size is the
bit depth for each RGBA component.
\sa accum(), setAccum(), accumBufferSize()
*/
void QGLFormat::setAccumBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setAccumBufferSize: Cannot set negative accumulate buffer size %d", size);
return;
}
d->accumSize = size;
setAccum(size > 0);
}
/*!
Returns the accumulation buffer size.
\sa setAccumBufferSize(), accum(), setAccum()
*/
int QGLFormat::accumBufferSize() const
{
return d->accumSize;
}
/*!
Set the preferred stencil buffer size to \a size.
\sa stencilBufferSize(), setStencil(), stencil()
*/
void QGLFormat::setStencilBufferSize(int size)
{
detach();
if (size < 0) {
qWarning("QGLFormat::setStencilBufferSize: Cannot set negative stencil buffer size %d", size);
return;
}
d->stencilSize = size;
setStencil(size > 0);
}
/*!
Returns the stencil buffer size.
\sa stencil(), setStencil(), setStencilBufferSize()
*/
int QGLFormat::stencilBufferSize() const
{
return d->stencilSize;
}
/*!
\since 4.7
Set the OpenGL version to the \a major and \a minor numbers. If a
context compatible with the requested OpenGL version cannot be
created, a context compatible with version 1.x is created instead.
\sa majorVersion(), minorVersion()
*/
void QGLFormat::setVersion(int major, int minor)
{
if (major < 1 || minor < 0) {
qWarning("QGLFormat::setVersion: Cannot set zero or negative version number %d.%d", major, minor);
return;
}
detach();
d->majorVersion = major;
d->minorVersion = minor;
}
/*!
\since 4.7
Returns the OpenGL major version.
\sa setVersion(), minorVersion()
*/
int QGLFormat::majorVersion() const
{
return d->majorVersion;
}
/*!
\since 4.7
Returns the OpenGL minor version.
\sa setVersion(), majorVersion()
*/
int QGLFormat::minorVersion() const
{
return d->minorVersion;
}
/*!
\enum QGLFormat::OpenGLContextProfile
\since 4.7
This enum describes the OpenGL context profiles that can be
specified for contexts implementing OpenGL version 3.2 or
higher. These profiles are different from OpenGL ES profiles.
\value NoProfile OpenGL version is lower than 3.2.
\value CoreProfile Functionality deprecated in OpenGL version 3.0 is not available.
\value CompatibilityProfile Functionality from earlier OpenGL versions is available.
*/
/*!
\since 4.7
Set the OpenGL context profile to \a profile. The \a profile is
ignored if the requested OpenGL version is less than 3.2.
\sa profile()
*/
void QGLFormat::setProfile(OpenGLContextProfile profile)
{
detach();
d->profile = profile;
}
/*!
\since 4.7
Returns the OpenGL context profile.
\sa setProfile()
*/
QGLFormat::OpenGLContextProfile QGLFormat::profile() const
{
return d->profile;
}
/*!
\fn bool QGLFormat::hasOpenGL()
Returns true if the window system has any OpenGL support;
otherwise returns false.
\warning This function must not be called until the QApplication
object has been created.
*/
/*!
\fn bool QGLFormat::hasOpenGLOverlays()
Returns true if the window system supports OpenGL overlays;
otherwise returns false.
\warning This function must not be called until the QApplication
object has been created.
*/
QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(const QString &versionString)
{
QGLFormat::OpenGLVersionFlags versionFlags = QGLFormat::OpenGL_Version_None;
if (versionString.startsWith(QLatin1String("OpenGL ES"))) {
QStringList parts = versionString.split(QLatin1Char(' '));
if (parts.size() >= 3) {
if (parts[2].startsWith(QLatin1String("1."))) {
if (parts[1].endsWith(QLatin1String("-CM"))) {
versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_0 |
QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
if (parts[2].startsWith(QLatin1String("1.1")))
versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_1 |
QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
} else {
// Not -CM, must be CL, CommonLite
versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
if (parts[2].startsWith(QLatin1String("1.1")))
versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
}
} else {
// OpenGL ES version 2.0 or higher
versionFlags |= QGLFormat::OpenGL_ES_Version_2_0;
}
} else {
// if < 3 parts to the name, it is an unrecognised OpenGL ES
qWarning("Unrecognised OpenGL ES version");
}
} else {
// not ES, regular OpenGL, the version numbers are first in the string
if (versionString.startsWith(QLatin1String("1."))) {
switch (versionString[2].toLatin1()) {
case '5':
versionFlags |= QGLFormat::OpenGL_Version_1_5;
case '4':
versionFlags |= QGLFormat::OpenGL_Version_1_4;
case '3':
versionFlags |= QGLFormat::OpenGL_Version_1_3;
case '2':
versionFlags |= QGLFormat::OpenGL_Version_1_2;
case '1':
versionFlags |= QGLFormat::OpenGL_Version_1_1;
default:
break;
}
} else if (versionString.startsWith(QLatin1String("2."))) {
versionFlags |= QGLFormat::OpenGL_Version_1_1 |
QGLFormat::OpenGL_Version_1_2 |
QGLFormat::OpenGL_Version_1_3 |
QGLFormat::OpenGL_Version_1_4 |
QGLFormat::OpenGL_Version_1_5 |
QGLFormat::OpenGL_Version_2_0;
if (versionString[2].toLatin1() == '1')
versionFlags |= QGLFormat::OpenGL_Version_2_1;
} else if (versionString.startsWith(QLatin1String("3."))) {
versionFlags |= QGLFormat::OpenGL_Version_1_1 |
QGLFormat::OpenGL_Version_1_2 |
QGLFormat::OpenGL_Version_1_3 |
QGLFormat::OpenGL_Version_1_4 |
QGLFormat::OpenGL_Version_1_5 |
QGLFormat::OpenGL_Version_2_0 |
QGLFormat::OpenGL_Version_2_1 |
QGLFormat::OpenGL_Version_3_0;
switch (versionString[2].toLatin1()) {
case '3':
versionFlags |= QGLFormat::OpenGL_Version_3_3;
case '2':
versionFlags |= QGLFormat::OpenGL_Version_3_2;
case '1':
versionFlags |= QGLFormat::OpenGL_Version_3_1;
case '0':
break;
default:
versionFlags |= QGLFormat::OpenGL_Version_3_1 |
QGLFormat::OpenGL_Version_3_2 |
QGLFormat::OpenGL_Version_3_3;
break;
}
} else if (versionString.startsWith(QLatin1String("4."))) {
versionFlags |= QGLFormat::OpenGL_Version_1_1 |
QGLFormat::OpenGL_Version_1_2 |
QGLFormat::OpenGL_Version_1_3 |
QGLFormat::OpenGL_Version_1_4 |
QGLFormat::OpenGL_Version_1_5 |
QGLFormat::OpenGL_Version_2_0 |
QGLFormat::OpenGL_Version_2_1 |
QGLFormat::OpenGL_Version_3_0 |
QGLFormat::OpenGL_Version_3_1 |
QGLFormat::OpenGL_Version_3_2 |
QGLFormat::OpenGL_Version_3_3 |
QGLFormat::OpenGL_Version_4_0;
} else {
versionFlags |= QGLFormat::OpenGL_Version_1_1 |
QGLFormat::OpenGL_Version_1_2 |
QGLFormat::OpenGL_Version_1_3 |
QGLFormat::OpenGL_Version_1_4 |
QGLFormat::OpenGL_Version_1_5 |
QGLFormat::OpenGL_Version_2_0 |
QGLFormat::OpenGL_Version_2_1 |
QGLFormat::OpenGL_Version_3_0 |
QGLFormat::OpenGL_Version_3_1 |
QGLFormat::OpenGL_Version_3_2 |
QGLFormat::OpenGL_Version_3_3 |
QGLFormat::OpenGL_Version_4_0;
}
}
return versionFlags;
}
/*!
\enum QGLFormat::OpenGLVersionFlag
\since 4.2
This enum describes the various OpenGL versions that are
recognized by Qt. Use the QGLFormat::openGLVersionFlags() function
to identify which versions that are supported at runtime.
\value OpenGL_Version_None If no OpenGL is present or if no OpenGL context is current.
\value OpenGL_Version_1_1 OpenGL version 1.1 or higher is present.
\value OpenGL_Version_1_2 OpenGL version 1.2 or higher is present.
\value OpenGL_Version_1_3 OpenGL version 1.3 or higher is present.
\value OpenGL_Version_1_4 OpenGL version 1.4 or higher is present.
\value OpenGL_Version_1_5 OpenGL version 1.5 or higher is present.
\value OpenGL_Version_2_0 OpenGL version 2.0 or higher is present.
Note that version 2.0 supports all the functionality of version 1.5.
\value OpenGL_Version_2_1 OpenGL version 2.1 or higher is present.
\value OpenGL_Version_3_0 OpenGL version 3.0 or higher is present.
\value OpenGL_Version_3_1 OpenGL version 3.1 or higher is present.
Note that OpenGL version 3.1 or higher does not necessarily support all the features of
version 3.0 and lower.
\value OpenGL_Version_3_2 OpenGL version 3.2 or higher is present.
\value OpenGL_Version_3_3 OpenGL version 3.3 or higher is present.
\value OpenGL_Version_4_0 OpenGL version 4.0 or higher is present.
\value OpenGL_ES_CommonLite_Version_1_0 OpenGL ES version 1.0 Common Lite or higher is present.
\value OpenGL_ES_Common_Version_1_0 OpenGL ES version 1.0 Common or higher is present.
The Common profile supports all the features of Common Lite.
\value OpenGL_ES_CommonLite_Version_1_1 OpenGL ES version 1.1 Common Lite or higher is present.
\value OpenGL_ES_Common_Version_1_1 OpenGL ES version 1.1 Common or higher is present.
The Common profile supports all the features of Common Lite.
\value OpenGL_ES_Version_2_0 OpenGL ES version 2.0 or higher is present.
Note that OpenGL ES version 2.0 does not support all the features of OpenGL ES 1.x.
So if OpenGL_ES_Version_2_0 is returned, none of the ES 1.x flags are returned.
See also \l{http://www.opengl.org} for more information about the different
revisions of OpenGL.
\sa openGLVersionFlags()
*/
/*!
\since 4.2
Identifies, at runtime, which OpenGL versions that are supported
by the current platform.
Note that if OpenGL version 1.5 is supported, its predecessors
(i.e., version 1.4 and lower) are also supported. To identify the
support of a particular feature, like multi texturing, test for
the version in which the feature was first introduced (i.e.,
version 1.3 in the case of multi texturing) to adapt to the largest
possible group of runtime platforms.
This function needs a valid current OpenGL context to work;
otherwise it will return OpenGL_Version_None.
\sa hasOpenGL(), hasOpenGLOverlays()
*/
QGLFormat::OpenGLVersionFlags QGLFormat::openGLVersionFlags()
{
static bool cachedDefault = false;
static OpenGLVersionFlags defaultVersionFlags = OpenGL_Version_None;
QGLContext *currentCtx = const_cast<QGLContext *>(QGLContext::currentContext());
QGLTemporaryContext *tmpContext = 0;
if (currentCtx && currentCtx->d_func()->version_flags_cached)
return currentCtx->d_func()->version_flags;
if (!currentCtx) {
if (cachedDefault) {
return defaultVersionFlags;
} else {
if (!hasOpenGL())
return defaultVersionFlags;
tmpContext = new QGLTemporaryContext;
cachedDefault = true;
}
}
QString versionString(QLatin1String(reinterpret_cast<const char*>(glGetString(GL_VERSION))));
OpenGLVersionFlags versionFlags = qOpenGLVersionFlagsFromString(versionString);
if (currentCtx) {
currentCtx->d_func()->version_flags_cached = true;
currentCtx->d_func()->version_flags = versionFlags;
}
if (tmpContext) {
defaultVersionFlags = versionFlags;
delete tmpContext;
}
return versionFlags;
}
/*!
Returns the default QGLFormat for the application. All QGLWidget
objects that are created use this format unless another format is
specified, e.g. when they are constructed.
If no special default format has been set using
setDefaultFormat(), the default format is the same as that created
with QGLFormat().
\sa setDefaultFormat()
*/
QGLFormat QGLFormat::defaultFormat()
{
return *qgl_default_format();
}
/*!
Sets a new default QGLFormat for the application to \a f. For
example, to set single buffering as the default instead of double
buffering, your main() might contain code like this:
\snippet code/src_opengl_qgl.cpp 4
\sa defaultFormat()
*/
void QGLFormat::setDefaultFormat(const QGLFormat &f)
{
*qgl_default_format() = f;
}
/*!
Returns the default QGLFormat for overlay contexts.
The default overlay format is:
\list
\li \l{setDoubleBuffer()}{Double buffer:} Disabled.
\li \l{setDepth()}{Depth buffer:} Disabled.
\li \l{setRgba()}{RGBA:} Disabled (i.e., color index enabled).
\li \l{setAlpha()}{Alpha channel:} Disabled.
\li \l{setAccum()}{Accumulator buffer:} Disabled.
\li \l{setStencil()}{Stencil buffer:} Disabled.
\li \l{setStereo()}{Stereo:} Disabled.
\li \l{setDirectRendering()}{Direct rendering:} Enabled.
\li \l{setOverlay()}{Overlay:} Disabled.
\li \l{setSampleBuffers()}{Multisample buffers:} Disabled.
\li \l{setPlane()}{Plane:} 1 (i.e., first overlay plane).
\endlist
\sa setDefaultFormat()
*/
QGLFormat QGLFormat::defaultOverlayFormat()
{
return *defaultOverlayFormatInstance();
}
/*!
Sets a new default QGLFormat for overlay contexts to \a f. This
format is used whenever a QGLWidget is created with a format that
hasOverlay() enabled.
For example, to get a double buffered overlay context (if
available), use code like this:
\snippet code/src_opengl_qgl.cpp 5
As usual, you can find out after widget creation whether the
underlying OpenGL system was able to provide the requested
specification:
\snippet code/src_opengl_qgl.cpp 6
\sa defaultOverlayFormat()
*/
void QGLFormat::setDefaultOverlayFormat(const QGLFormat &f)
{
QGLFormat *defaultFormat = defaultOverlayFormatInstance();
*defaultFormat = f;
// Make sure the user doesn't request that the overlays themselves
// have overlays, since it is unlikely that the system supports
// infinitely many planes...
defaultFormat->setOverlay(false);
}
/*!
Returns true if all the options of the two QGLFormat objects
\a a and \a b are equal; otherwise returns false.
\relates QGLFormat
*/
bool operator==(const QGLFormat& a, const QGLFormat& b)
{
return (a.d == b.d) || ((int) a.d->opts == (int) b.d->opts
&& a.d->pln == b.d->pln
&& a.d->alphaSize == b.d->alphaSize
&& a.d->accumSize == b.d->accumSize
&& a.d->stencilSize == b.d->stencilSize
&& a.d->depthSize == b.d->depthSize
&& a.d->redSize == b.d->redSize
&& a.d->greenSize == b.d->greenSize
&& a.d->blueSize == b.d->blueSize
&& a.d->numSamples == b.d->numSamples
&& a.d->swapInterval == b.d->swapInterval
&& a.d->majorVersion == b.d->majorVersion
&& a.d->minorVersion == b.d->minorVersion
&& a.d->profile == b.d->profile);
}
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QGLFormat &f)
{
const QGLFormatPrivate * const d = f.d;
dbg.nospace() << "QGLFormat("
<< "options " << d->opts
<< ", plane " << d->pln
<< ", depthBufferSize " << d->depthSize
<< ", accumBufferSize " << d->accumSize
<< ", stencilBufferSize " << d->stencilSize
<< ", redBufferSize " << d->redSize
<< ", greenBufferSize " << d->greenSize
<< ", blueBufferSize " << d->blueSize
<< ", alphaBufferSize " << d->alphaSize
<< ", samples " << d->numSamples
<< ", swapInterval " << d->swapInterval
<< ", majorVersion " << d->majorVersion
<< ", minorVersion " << d->minorVersion
<< ", profile " << d->profile
<< ')';
return dbg.space();
}
#endif
/*!
Returns false if all the options of the two QGLFormat objects
\a a and \a b are equal; otherwise returns true.
\relates QGLFormat
*/
bool operator!=(const QGLFormat& a, const QGLFormat& b)
{
return !(a == b);
}
struct QGLContextGroupList {
void append(QGLContextGroup *group) {
QMutexLocker locker(&m_mutex);
m_list.append(group);
}
void remove(QGLContextGroup *group) {
QMutexLocker locker(&m_mutex);
m_list.removeOne(group);
}
QList<QGLContextGroup *> m_list;
QMutex m_mutex;
};
Q_GLOBAL_STATIC(QGLContextGroupList, qt_context_groups)
/*****************************************************************************
QGLContext implementation
*****************************************************************************/
QGLContextGroup::QGLContextGroup(const QGLContext *context)
: m_context(context), m_refs(1)
{
qt_context_groups()->append(this);
}
QGLContextGroup::~QGLContextGroup()
{
qt_context_groups()->remove(this);
}
const QGLContext *qt_gl_transfer_context(const QGLContext *ctx)
{
if (!ctx)
return 0;
QList<const QGLContext *> shares
(QGLContextPrivate::contextGroup(ctx)->shares());
if (shares.size() >= 2)
return (ctx == shares.at(0)) ? shares.at(1) : shares.at(0);
else
return 0;
}
QGLContextPrivate::QGLContextPrivate(QGLContext *context)
: internal_context(false)
, q_ptr(context)
, texture_destroyer(0)
, functions(0)
{
group = new QGLContextGroup(context);
if (qApp) {
texture_destroyer = new QGLTextureDestroyer;
texture_destroyer->moveToThread(qApp->thread());
}
}
QGLContextPrivate::~QGLContextPrivate()
{
delete functions;
if (!group->m_refs.deref()) {
Q_ASSERT(group->context() == q_ptr);
delete group;
}
delete texture_destroyer;
}
void QGLContextPrivate::init(QPaintDevice *dev, const QGLFormat &format)
{
Q_Q(QGLContext);
glFormat = reqFormat = format;
valid = false;
q->setDevice(dev);
guiGlContext = 0;
ownContext = false;
fbo = 0;
crWin = false;
initDone = false;
sharing = false;
max_texture_size = -1;
version_flags_cached = false;
version_flags = QGLFormat::OpenGL_Version_None;
extension_flags_cached = false;
extension_flags = 0;
current_fbo = 0;
default_fbo = 0;
active_engine = 0;
workaround_needsFullClearOnEveryFrame = false;
workaround_brokenFBOReadBack = false;
workaround_brokenTexSubImage = false;
workaroundsCached = false;
workaround_brokenTextureFromPixmap = false;
workaround_brokenTextureFromPixmap_init = false;
workaround_brokenAlphaTexSubImage = false;
workaround_brokenAlphaTexSubImage_init = false;
for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
vertexAttributeArraysEnabledState[i] = false;
}
QGLContext* QGLContext::currentCtx = 0;
/*
Read back the contents of the currently bound framebuffer, used in
QGLWidget::grabFrameBuffer(), QGLPixelbuffer::toImage() and
QGLFramebufferObject::toImage()
*/
static void convertFromGLImage(QImage &img, int w, int h, bool alpha_format, bool include_alpha)
{
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
// OpenGL gives RGBA; Qt wants ARGB
uint *p = (uint*)img.bits();
uint *end = p + w*h;
if (alpha_format && include_alpha) {
while (p < end) {
uint a = *p << 24;
*p = (*p >> 8) | a;
p++;
}
} else {
// This is an old legacy fix for PowerPC based Macs, which
// we shouldn't remove
while (p < end) {
*p = 0xff000000 | (*p>>8);
++p;
}
}
} else {
// OpenGL gives ABGR (i.e. RGBA backwards); Qt wants ARGB
for (int y = 0; y < h; y++) {
uint *q = (uint*)img.scanLine(y);
for (int x=0; x < w; ++x) {
const uint pixel = *q;
if (alpha_format && include_alpha) {
*q = ((pixel << 16) & 0xff0000) | ((pixel >> 16) & 0xff)
| (pixel & 0xff00ff00);
} else {
*q = 0xff000000 | ((pixel << 16) & 0xff0000)
| ((pixel >> 16) & 0xff) | (pixel & 0x00ff00);
}
q++;
}
}
}
img = img.mirrored();
}
QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha)
{
QImage img(size, (alpha_format && include_alpha) ? QImage::Format_ARGB32_Premultiplied
: QImage::Format_RGB32);
int w = size.width();
int h = size.height();
glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
convertFromGLImage(img, w, h, alpha_format, include_alpha);
return img;
}
QImage qt_gl_read_texture(const QSize &size, bool alpha_format, bool include_alpha)
{
QImage img(size, alpha_format ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32);
int w = size.width();
int h = size.height();
#if !defined(QT_OPENGL_ES_2)
//### glGetTexImage not in GL ES 2.0, need to do something else here!
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
#endif
convertFromGLImage(img, w, h, alpha_format, include_alpha);
return img;
}
// returns the highest number closest to v, which is a power of 2
// NB! assumes 32 bit ints
int qt_next_power_of_two(int v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
++v;
return v;
}
Q_GLOBAL_STATIC(QGLTextureCache, qt_gl_texture_cache)
QGLTextureCache::QGLTextureCache()
: m_cache(64*1024) // cache ~64 MB worth of textures - this is not accurate though
{
QImagePixmapCleanupHooks::instance()->addPlatformPixmapModificationHook(cleanupTexturesForPixampData);
QImagePixmapCleanupHooks::instance()->addPlatformPixmapDestructionHook(cleanupBeforePixmapDestruction);
QImagePixmapCleanupHooks::instance()->addImageHook(cleanupTexturesForCacheKey);
}
QGLTextureCache::~QGLTextureCache()
{
QImagePixmapCleanupHooks::instance()->removePlatformPixmapModificationHook(cleanupTexturesForPixampData);
QImagePixmapCleanupHooks::instance()->removePlatformPixmapDestructionHook(cleanupBeforePixmapDestruction);
QImagePixmapCleanupHooks::instance()->removeImageHook(cleanupTexturesForCacheKey);
}
void QGLTextureCache::insert(QGLContext* ctx, qint64 key, QGLTexture* texture, int cost)
{
QWriteLocker locker(&m_lock);
const QGLTextureCacheKey cacheKey = {key, QGLContextPrivate::contextGroup(ctx)};
m_cache.insert(cacheKey, texture, cost);
}
void QGLTextureCache::remove(qint64 key)
{
QWriteLocker locker(&m_lock);
QMutexLocker groupLocker(&qt_context_groups()->m_mutex);
QList<QGLContextGroup *>::const_iterator it = qt_context_groups()->m_list.constBegin();
while (it != qt_context_groups()->m_list.constEnd()) {
const QGLTextureCacheKey cacheKey = {key, *it};
m_cache.remove(cacheKey);
++it;
}
}
bool QGLTextureCache::remove(QGLContext* ctx, GLuint textureId)
{
QWriteLocker locker(&m_lock);
QList<QGLTextureCacheKey> keys = m_cache.keys();
for (int i = 0; i < keys.size(); ++i) {
QGLTexture *tex = m_cache.object(keys.at(i));
if (tex->id == textureId && tex->context == ctx) {
tex->options |= QGLContext::MemoryManagedBindOption; // forces a glDeleteTextures() call
m_cache.remove(keys.at(i));
return true;
}
}
return false;
}
void QGLTextureCache::removeContextTextures(QGLContext* ctx)
{
QWriteLocker locker(&m_lock);
QList<QGLTextureCacheKey> keys = m_cache.keys();
for (int i = 0; i < keys.size(); ++i) {
const QGLTextureCacheKey &key = keys.at(i);
if (m_cache.object(key)->context == ctx)
m_cache.remove(key);
}
}
/*
a hook that removes textures from the cache when a pixmap/image
is deref'ed
*/
void QGLTextureCache::cleanupTexturesForCacheKey(qint64 cacheKey)
{
qt_gl_texture_cache()->remove(cacheKey);
}
void QGLTextureCache::cleanupTexturesForPixampData(QPlatformPixmap* pmd)
{
cleanupTexturesForCacheKey(pmd->cacheKey());
}
void QGLTextureCache::cleanupBeforePixmapDestruction(QPlatformPixmap* pmd)
{
// Remove any bound textures first:
cleanupTexturesForPixampData(pmd);
}
QGLTextureCache *QGLTextureCache::instance()
{
return qt_gl_texture_cache();
}
// DDS format structure
struct DDSFormat {
quint32 dwSize;
quint32 dwFlags;
quint32 dwHeight;
quint32 dwWidth;
quint32 dwLinearSize;
quint32 dummy1;
quint32 dwMipMapCount;
quint32 dummy2[11];
struct {
quint32 dummy3[2];
quint32 dwFourCC;
quint32 dummy4[5];
} ddsPixelFormat;
};
// compressed texture pixel formats
#define FOURCC_DXT1 0x31545844
#define FOURCC_DXT2 0x32545844
#define FOURCC_DXT3 0x33545844
#define FOURCC_DXT4 0x34545844
#define FOURCC_DXT5 0x35545844
#ifndef GL_COMPRESSED_RGB_S3TC_DXT1_EXT
#define GL_COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
#define GL_COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1
#define GL_COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2
#define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3
#endif
#ifndef GL_GENERATE_MIPMAP_SGIS
#define GL_GENERATE_MIPMAP_SGIS 0x8191
#define GL_GENERATE_MIPMAP_HINT_SGIS 0x8192
#endif
/*!
\class QGLContext
\brief The QGLContext class encapsulates an OpenGL rendering context.
\ingroup painting-3D
An OpenGL rendering context is a complete set of OpenGL state
variables. The rendering context's \l {QGL::FormatOption} {format}
is set in the constructor, but it can also be set later with
setFormat(). The format options that are actually set are returned
by format(); the options you asked for are returned by
requestedFormat(). Note that after a QGLContext object has been
constructed, the actual OpenGL context must be created by
explicitly calling the \l{create()}
function. The makeCurrent() function makes this context the
current rendering context. You can make \e no context current
using doneCurrent(). The reset() function will reset the context
and make it invalid.
You can examine properties of the context with, e.g. isValid(),
isSharing(), initialized(), windowCreated() and
overlayTransparentColor().
If you're using double buffering you can swap the screen contents
with the off-screen buffer using swapBuffers().
Please note that QGLContext is not thread safe.
*/
/*!
\enum QGLContext::BindOption
\since 4.6
A set of options to decide how to bind a texture using bindTexture().
\value NoBindOption Don't do anything, pass the texture straight
through.
\value InvertedYBindOption Specifies that the texture should be flipped
over the X axis so that the texture coordinate 0,0 corresponds to
the top left corner. Inverting the texture implies a deep copy
prior to upload.
\value MipmapBindOption Specifies that bindTexture() should try
to generate mipmaps. If the GL implementation supports the \c
GL_SGIS_generate_mipmap extension, mipmaps will be automatically
generated for the texture. Mipmap generation is only supported for
the \c GL_TEXTURE_2D target.
\value PremultipliedAlphaBindOption Specifies that the image should be
uploaded with premultiplied alpha and does a conversion accordingly.
\value LinearFilteringBindOption Specifies that the texture filtering
should be set to GL_LINEAR. Default is GL_NEAREST. If mipmap is
also enabled, filtering will be set to GL_LINEAR_MIPMAP_LINEAR.
\value DefaultBindOption In Qt 4.5 and earlier, bindTexture()
would mirror the image and automatically generate mipmaps. This
option helps preserve this default behavior.
\omitvalue CanFlipNativePixmapBindOption Used by x11 from pixmap to choose
whether or not it can bind the pixmap upside down or not.
\omitvalue MemoryManagedBindOption Used by paint engines to
indicate that the pixmap should be memory managed along side with
the pixmap/image that it stems from, e.g. installing destruction
hooks in them.
\omitvalue TemporarilyCachedBindOption Used by paint engines on some
platforms to indicate that the pixmap or image texture is possibly
cached only temporarily and must be destroyed immediately after the use.
\omitvalue InternalBindOption
*/
/*!
\obsolete
Constructs an OpenGL context for the given paint \a device, which
can be a widget or a pixmap. The \a format specifies several
display options for the context.
If the underlying OpenGL/Window system cannot satisfy all the
features requested in \a format, the nearest subset of features
will be used. After creation, the format() method will return the
actual format obtained.
Note that after a QGLContext object has been constructed, \l
create() must be called explicitly to create the actual OpenGL
context. The context will be \l {isValid()}{invalid} if it was not
possible to obtain a GL context at all.
*/
QGLContext::QGLContext(const QGLFormat &format, QPaintDevice *device)
: d_ptr(new QGLContextPrivate(this))
{
Q_D(QGLContext);
d->init(device, format);
}
/*!
Constructs an OpenGL context with the given \a format which
specifies several display options for the context.
If the underlying OpenGL/Window system cannot satisfy all the
features requested in \a format, the nearest subset of features
will be used. After creation, the format() method will return the
actual format obtained.
Note that after a QGLContext object has been constructed, \l
create() must be called explicitly to create the actual OpenGL
context. The context will be \l {isValid()}{invalid} if it was not
possible to obtain a GL context at all.
\sa format(), isValid()
*/
QGLContext::QGLContext(const QGLFormat &format)
: d_ptr(new QGLContextPrivate(this))
{
Q_D(QGLContext);
d->init(0, format);
}
/*!
Destroys the OpenGL context and frees its resources.
*/
QGLContext::~QGLContext()
{
// remove any textures cached in this context
QGLTextureCache::instance()->removeContextTextures(this);
// clean up resources specific to this context
d_ptr->cleanup();
QGLSignalProxy::instance()->emitAboutToDestroyContext(this);
reset();
}
void QGLContextPrivate::cleanup()
{
}
#define ctx q_ptr
void QGLContextPrivate::setVertexAttribArrayEnabled(int arrayIndex, bool enabled)
{
Q_ASSERT(arrayIndex < QT_GL_VERTEX_ARRAY_TRACKED_COUNT);
#ifdef glEnableVertexAttribArray
Q_ASSERT(glEnableVertexAttribArray);
#endif
if (vertexAttributeArraysEnabledState[arrayIndex] && !enabled)
glDisableVertexAttribArray(arrayIndex);
if (!vertexAttributeArraysEnabledState[arrayIndex] && enabled)
glEnableVertexAttribArray(arrayIndex);
vertexAttributeArraysEnabledState[arrayIndex] = enabled;
}
void QGLContextPrivate::syncGlState()
{
#ifdef glEnableVertexAttribArray
Q_ASSERT(glEnableVertexAttribArray);
#endif
for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i) {
if (vertexAttributeArraysEnabledState[i])
glEnableVertexAttribArray(i);
else
glDisableVertexAttribArray(i);
}
}
#undef ctx
void QGLContextPrivate::swapRegion(const QRegion &)
{
Q_Q(QGLContext);
q->swapBuffers();
}
/*!
\overload
Reads the compressed texture file \a fileName and generates a 2D GL
texture from it.
This function can load DirectDrawSurface (DDS) textures in the
DXT1, DXT3 and DXT5 DDS formats if the \c GL_ARB_texture_compression
and \c GL_EXT_texture_compression_s3tc extensions are supported.
Since 4.6.1, textures in the ETC1 format can be loaded if the
\c GL_OES_compressed_ETC1_RGB8_texture extension is supported
and the ETC1 texture has been encapsulated in the PVR container format.
Also, textures in the PVRTC2 and PVRTC4 formats can be loaded
if the \c GL_IMG_texture_compression_pvrtc extension is supported.
\sa deleteTexture()
*/
GLuint QGLContext::bindTexture(const QString &fileName)
{
QGLTexture texture(this);
QSize size = texture.bindCompressedTexture(fileName);
if (!size.isValid())
return 0;
return texture.id;
}
static inline QRgb qt_gl_convertToGLFormatHelper(QRgb src_pixel, GLenum texture_format)
{
if (texture_format == GL_BGRA) {
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return ((src_pixel << 24) & 0xff000000)
| ((src_pixel >> 24) & 0x000000ff)
| ((src_pixel << 8) & 0x00ff0000)
| ((src_pixel >> 8) & 0x0000ff00);
} else {
return src_pixel;
}
} else { // GL_RGBA
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
return (src_pixel << 8) | ((src_pixel >> 24) & 0xff);
} else {
return ((src_pixel << 16) & 0xff0000)
| ((src_pixel >> 16) & 0xff)
| (src_pixel & 0xff00ff00);
}
}
}
QRgb qt_gl_convertToGLFormat(QRgb src_pixel, GLenum texture_format)
{
return qt_gl_convertToGLFormatHelper(src_pixel, texture_format);
}
static void convertToGLFormatHelper(QImage &dst, const QImage &img, GLenum texture_format)
{
Q_ASSERT(dst.depth() == 32);
Q_ASSERT(img.depth() == 32);
if (dst.size() != img.size()) {
int target_width = dst.width();
int target_height = dst.height();
qreal sx = target_width / qreal(img.width());
qreal sy = target_height / qreal(img.height());
quint32 *dest = (quint32 *) dst.scanLine(0); // NB! avoid detach here
uchar *srcPixels = (uchar *) img.scanLine(img.height() - 1);
int sbpl = img.bytesPerLine();
int dbpl = dst.bytesPerLine();
int ix = int(0x00010000 / sx);
int iy = int(0x00010000 / sy);
quint32 basex = int(0.5 * ix);
quint32 srcy = int(0.5 * iy);
// scale, swizzle and mirror in one loop
while (target_height--) {
const uint *src = (const quint32 *) (srcPixels - (srcy >> 16) * sbpl);
int srcx = basex;
for (int x=0; x<target_width; ++x) {
dest[x] = qt_gl_convertToGLFormatHelper(src[srcx >> 16], texture_format);
srcx += ix;
}
dest = (quint32 *)(((uchar *) dest) + dbpl);
srcy += iy;
}
} else {
const int width = img.width();
const int height = img.height();
const uint *p = (const uint*) img.scanLine(img.height() - 1);
uint *q = (uint*) dst.scanLine(0);
if (texture_format == GL_BGRA) {
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
// mirror + swizzle
for (int i=0; i < height; ++i) {
const uint *end = p + width;
while (p < end) {
*q = ((*p << 24) & 0xff000000)
| ((*p >> 24) & 0x000000ff)
| ((*p << 8) & 0x00ff0000)
| ((*p >> 8) & 0x0000ff00);
p++;
q++;
}
p -= 2 * width;
}
} else {
const uint bytesPerLine = img.bytesPerLine();
for (int i=0; i < height; ++i) {
memcpy(q, p, bytesPerLine);
q += width;
p -= width;
}
}
} else {
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
for (int i=0; i < height; ++i) {
const uint *end = p + width;
while (p < end) {
*q = (*p << 8) | ((*p >> 24) & 0xff);
p++;
q++;
}
p -= 2 * width;
}
} else {
for (int i=0; i < height; ++i) {
const uint *end = p + width;
while (p < end) {
*q = ((*p << 16) & 0xff0000) | ((*p >> 16) & 0xff) | (*p & 0xff00ff00);
p++;
q++;
}
p -= 2 * width;
}
}
}
}
}
QGLExtensionFuncs& QGLContextPrivate::extensionFuncs(const QGLContext *)
{
return qt_extensionFuncs;
}
QImage QGLContextPrivate::convertToGLFormat(const QImage &image, bool force_premul,
GLenum texture_format)
{
QImage::Format target_format = image.format();
if (force_premul || image.format() != QImage::Format_ARGB32)
target_format = QImage::Format_ARGB32_Premultiplied;
QImage result(image.width(), image.height(), target_format);
convertToGLFormatHelper(result, image.convertToFormat(target_format), texture_format);
return result;
}
/*! \internal */
QGLTexture *QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint format,
QGLContext::BindOptions options)
{
Q_Q(QGLContext);
const qint64 key = image.cacheKey();
QGLTexture *texture = textureCacheLookup(key, target);
if (texture) {
if (image.paintingActive()) {
// A QPainter is active on the image - take the safe route and replace the texture.
q->deleteTexture(texture->id);
texture = 0;
} else {
glBindTexture(target, texture->id);
return texture;
}
}
if (!texture)
texture = bindTexture(image, target, format, key, options);
// NOTE: bindTexture(const QImage&, GLenum, GLint, const qint64, bool) should never return null
Q_ASSERT(texture);
// Enable the cleanup hooks for this image so that the texture cache entry is removed when the
// image gets deleted:
QImagePixmapCleanupHooks::enableCleanupHooks(image);
return texture;
}
// #define QGL_BIND_TEXTURE_DEBUG
// map from Qt's ARGB endianness-dependent format to GL's big-endian RGBA layout
static inline void qgl_byteSwapImage(QImage &img, GLenum pixel_type)
{
const int width = img.width();
const int height = img.height();
if (pixel_type == GL_UNSIGNED_INT_8_8_8_8_REV
|| (pixel_type == GL_UNSIGNED_BYTE && QSysInfo::ByteOrder == QSysInfo::LittleEndian))
{
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
}
} else {
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = (p[x] << 8) | ((p[x] >> 24) & 0xff);
}
}
}
QGLTexture* QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint internalFormat,
const qint64 key, QGLContext::BindOptions options)
{
Q_Q(QGLContext);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf("QGLContextPrivate::bindTexture(), imageSize=(%d,%d), internalFormat =0x%x, options=%x, key=%llx\n",
image.width(), image.height(), internalFormat, int(options), key);
QTime time;
time.start();
#endif
#ifndef QT_NO_DEBUG
// Reset the gl error stack...git
while (glGetError() != GL_NO_ERROR) ;
#endif
// Scale the pixmap if needed. GL textures needs to have the
// dimensions 2^n+2(border) x 2^m+2(border), unless we're using GL
// 2.0 or use the GL_TEXTURE_RECTANGLE texture target
int tx_w = qt_next_power_of_two(image.width());
int tx_h = qt_next_power_of_two(image.height());
QImage img = image;
if (!(QGLExtensions::glExtensions() & QGLExtensions::NPOTTextures)
&& !(QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_ES_Version_2_0)
&& (target == GL_TEXTURE_2D && (tx_w != image.width() || tx_h != image.height())))
{
img = img.scaled(tx_w, tx_h);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - upscaled to %dx%d (%d ms)\n", tx_w, tx_h, time.elapsed());
#endif
}
GLuint filtering = options & QGLContext::LinearFilteringBindOption ? GL_LINEAR : GL_NEAREST;
GLuint tx_id;
glGenTextures(1, &tx_id);
glBindTexture(target, tx_id);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filtering);
#if defined(QT_OPENGL_ES_2)
bool genMipmap = false;
#endif
if (glFormat.directRendering()
&& (QGLExtensions::glExtensions() & QGLExtensions::GenerateMipmap)
&& target == GL_TEXTURE_2D
&& (options & QGLContext::MipmapBindOption))
{
#if !defined(QT_OPENGL_ES_2)
glHint(GL_GENERATE_MIPMAP_HINT_SGIS, GL_NICEST);
glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
#else
glHint(GL_GENERATE_MIPMAP_HINT, GL_NICEST);
genMipmap = true;
#endif
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, options & QGLContext::LinearFilteringBindOption
? GL_LINEAR_MIPMAP_LINEAR : GL_NEAREST_MIPMAP_NEAREST);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - generating mipmaps (%d ms)\n", time.elapsed());
#endif
} else {
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filtering);
}
QImage::Format target_format = img.format();
bool premul = options & QGLContext::PremultipliedAlphaBindOption;
GLenum externalFormat;
GLuint pixel_type;
if (QGLExtensions::glExtensions() & QGLExtensions::BGRATextureFormat) {
externalFormat = GL_BGRA;
if (QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_1_2)
pixel_type = GL_UNSIGNED_INT_8_8_8_8_REV;
else
pixel_type = GL_UNSIGNED_BYTE;
} else {
externalFormat = GL_RGBA;
pixel_type = GL_UNSIGNED_BYTE;
}
switch (target_format) {
case QImage::Format_ARGB32:
if (premul) {
img = img.convertToFormat(target_format = QImage::Format_ARGB32_Premultiplied);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - converted ARGB32 -> ARGB32_Premultiplied (%d ms) \n", time.elapsed());
#endif
}
break;
case QImage::Format_ARGB32_Premultiplied:
if (!premul) {
img = img.convertToFormat(target_format = QImage::Format_ARGB32);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - converted ARGB32_Premultiplied -> ARGB32 (%d ms)\n", time.elapsed());
#endif
}
break;
case QImage::Format_RGB16:
pixel_type = GL_UNSIGNED_SHORT_5_6_5;
externalFormat = GL_RGB;
internalFormat = GL_RGB;
break;
case QImage::Format_RGB32:
break;
default:
if (img.hasAlphaChannel()) {
img = img.convertToFormat(premul
? QImage::Format_ARGB32_Premultiplied
: QImage::Format_ARGB32);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - converted to 32-bit alpha format (%d ms)\n", time.elapsed());
#endif
} else {
img = img.convertToFormat(QImage::Format_RGB32);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - converted to 32-bit (%d ms)\n", time.elapsed());
#endif
}
}
if (options & QGLContext::InvertedYBindOption) {
if (img.isDetached()) {
int ipl = img.bytesPerLine() / 4;
int h = img.height();
for (int y=0; y<h/2; ++y) {
int *a = (int *) img.scanLine(y);
int *b = (int *) img.scanLine(h - y - 1);
for (int x=0; x<ipl; ++x)
qSwap(a[x], b[x]);
}
} else {
// Create a new image and copy across. If we use the
// above in-place code then a full copy of the image is
// made before the lines are swapped, which processes the
// data twice. This version should only do it once.
img = img.mirrored();
}
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - flipped bits over y (%d ms)\n", time.elapsed());
#endif
}
if (externalFormat == GL_RGBA) {
// The only case where we end up with a depth different from
// 32 in the switch above is for the RGB16 case, where we set
// the format to GL_RGB
Q_ASSERT(img.depth() == 32);
qgl_byteSwapImage(img, pixel_type);
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - did byte swapping (%d ms)\n", time.elapsed());
#endif
}
#ifdef QT_OPENGL_ES
// OpenGL/ES requires that the internal and external formats be
// identical.
internalFormat = externalFormat;
#endif
#ifdef QGL_BIND_TEXTURE_DEBUG
printf(" - uploading, image.format=%d, externalFormat=0x%x, internalFormat=0x%x, pixel_type=0x%x\n",
img.format(), externalFormat, internalFormat, pixel_type);
#endif
const QImage &constRef = img; // to avoid detach in bits()...
glTexImage2D(target, 0, internalFormat, img.width(), img.height(), 0, externalFormat,
pixel_type, constRef.bits());
#if defined(QT_OPENGL_ES_2)
if (genMipmap)
glGenerateMipmap(target);
#endif
#ifndef QT_NO_DEBUG
GLenum error = glGetError();
if (error != GL_NO_ERROR) {
qWarning(" - texture upload failed, error code 0x%x, enum: %d (%x)\n", error, target, target);
}
#endif
#ifdef QGL_BIND_TEXTURE_DEBUG
static int totalUploadTime = 0;
totalUploadTime += time.elapsed();
printf(" - upload done in %d ms, (accumulated: %d ms)\n", time.elapsed(), totalUploadTime);
#endif
// this assumes the size of a texture is always smaller than the max cache size
int cost = img.width()*img.height()*4/1024;
QGLTexture *texture = new QGLTexture(q, tx_id, target, options);
QGLTextureCache::instance()->insert(q, key, texture, cost);
return texture;
}
QGLTexture *QGLContextPrivate::textureCacheLookup(const qint64 key, GLenum target)
{
Q_Q(QGLContext);
QGLTexture *texture = QGLTextureCache::instance()->getTexture(q, key);
if (texture && texture->target == target
&& (texture->context == q || QGLContext::areSharing(q, texture->context)))
{
return texture;
}
return 0;
}
/*! \internal */
QGLTexture *QGLContextPrivate::bindTexture(const QPixmap &pixmap, GLenum target, GLint format, QGLContext::BindOptions options)
{
Q_Q(QGLContext);
QPlatformPixmap *pd = pixmap.handle();
Q_UNUSED(pd);
const qint64 key = pixmap.cacheKey();
QGLTexture *texture = textureCacheLookup(key, target);
if (texture) {
if (pixmap.paintingActive()) {
// A QPainter is active on the pixmap - take the safe route and replace the texture.
q->deleteTexture(texture->id);
texture = 0;
} else {
glBindTexture(target, texture->id);
return texture;
}
}
if (!texture) {
QImage image = pixmap.toImage();
// If the system depth is 16 and the pixmap doesn't have an alpha channel
// then we convert it to RGB16 in the hope that it gets uploaded as a 16
// bit texture which is much faster to access than a 32-bit one.
if (pixmap.depth() == 16 && !image.hasAlphaChannel() )
image = image.convertToFormat(QImage::Format_RGB16);
texture = bindTexture(image, target, format, key, options);
}
// NOTE: bindTexture(const QImage&, GLenum, GLint, const qint64, bool) should never return null
Q_ASSERT(texture);
if (texture->id > 0)
QImagePixmapCleanupHooks::enableCleanupHooks(pixmap);
return texture;
}
/*! \internal */
int QGLContextPrivate::maxTextureSize()
{
if (max_texture_size != -1)
return max_texture_size;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
#if defined(QT_OPENGL_ES)
return max_texture_size;
#else
GLenum proxy = GL_PROXY_TEXTURE_2D;
GLint size;
GLint next = 64;
glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glGetTexLevelParameteriv(proxy, 0, GL_TEXTURE_WIDTH, &size);
if (size == 0) {
return max_texture_size;
}
do {
size = next;
next = size * 2;
if (next > max_texture_size)
break;
glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glGetTexLevelParameteriv(proxy, 0, GL_TEXTURE_WIDTH, &next);
} while (next > size);
max_texture_size = size;
return max_texture_size;
#endif
}
/*!
Returns a QGLFunctions object that is initialized for this context.
*/
QGLFunctions *QGLContext::functions() const
{
QGLContextPrivate *d = const_cast<QGLContextPrivate *>(d_func());
if (!d->functions) {
d->functions = new QGLFunctions(this);
d->functions->initializeGLFunctions(this);
}
return d->functions;
}
/*!
Generates and binds a 2D GL texture to the current context, based
on \a image. The generated texture id is returned and can be used in
later \c glBindTexture() calls.
\overload
*/
GLuint QGLContext::bindTexture(const QImage &image, GLenum target, GLint format)
{
if (image.isNull())
return 0;
Q_D(QGLContext);
QGLTexture *texture = d->bindTexture(image, target, format, DefaultBindOption);
return texture->id;
}
/*!
\since 4.6
Generates and binds a 2D GL texture to the current context, based
on \a image. The generated texture id is returned and can be used
in later \c glBindTexture() calls.
The \a target parameter specifies the texture target. The default
target is \c GL_TEXTURE_2D.
The \a format parameter sets the internal format for the
texture. The default format is \c GL_RGBA.
The binding \a options are a set of options used to decide how to
bind the texture to the context.
The texture that is generated is cached, so multiple calls to
bindTexture() with the same QImage will return the same texture
id.
Note that we assume default values for the glPixelStore() and
glPixelTransfer() parameters.
\sa deleteTexture()
*/
GLuint QGLContext::bindTexture(const QImage &image, GLenum target, GLint format, BindOptions options)
{
if (image.isNull())
return 0;
Q_D(QGLContext);
QGLTexture *texture = d->bindTexture(image, target, format, options);
return texture->id;
}
/*! \overload
Generates and binds a 2D GL texture based on \a pixmap.
*/
GLuint QGLContext::bindTexture(const QPixmap &pixmap, GLenum target, GLint format)
{
if (pixmap.isNull())
return 0;
Q_D(QGLContext);
QGLTexture *texture = d->bindTexture(pixmap, target, format, DefaultBindOption);
return texture->id;
}
/*!
\overload
\since 4.6
Generates and binds a 2D GL texture to the current context, based
on \a pixmap.
*/
GLuint QGLContext::bindTexture(const QPixmap &pixmap, GLenum target, GLint format, BindOptions options)
{
if (pixmap.isNull())
return 0;
Q_D(QGLContext);
QGLTexture *texture = d->bindTexture(pixmap, target, format, options);
return texture->id;
}
/*!
Removes the texture identified by \a id from the texture cache,
and calls glDeleteTextures() to delete the texture from the
context.
\sa bindTexture()
*/
void QGLContext::deleteTexture(GLuint id)
{
if (QGLTextureCache::instance()->remove(this, id))
return;
glDeleteTextures(1, &id);
}
void qt_add_rect_to_array(const QRectF &r, GLfloat *array)
{
qreal left = r.left();
qreal right = r.right();
qreal top = r.top();
qreal bottom = r.bottom();
array[0] = left;
array[1] = top;
array[2] = right;
array[3] = top;
array[4] = right;
array[5] = bottom;
array[6] = left;
array[7] = bottom;
}
void qt_add_texcoords_to_array(qreal x1, qreal y1, qreal x2, qreal y2, GLfloat *array)
{
array[0] = x1;
array[1] = y1;
array[2] = x2;
array[3] = y1;
array[4] = x2;
array[5] = y2;
array[6] = x1;
array[7] = y2;
}
#if !defined(QT_OPENGL_ES_2)
static void qDrawTextureRect(const QRectF &target, GLint textureWidth, GLint textureHeight, GLenum textureTarget)
{
GLfloat tx = 1.0f;
GLfloat ty = 1.0f;
#ifdef QT_OPENGL_ES
Q_UNUSED(textureWidth);
Q_UNUSED(textureHeight);
Q_UNUSED(textureTarget);
#else
if (textureTarget != GL_TEXTURE_2D) {
if (textureWidth == -1 || textureHeight == -1) {
glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_WIDTH, &textureWidth);
glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_HEIGHT, &textureHeight);
}
tx = GLfloat(textureWidth);
ty = GLfloat(textureHeight);
}
#endif
GLfloat texCoordArray[4*2] = {
0, ty, tx, ty, tx, 0, 0, 0
};
GLfloat vertexArray[4*2];
qt_add_rect_to_array(target, vertexArray);
glVertexPointer(2, GL_FLOAT, 0, vertexArray);
glTexCoordPointer(2, GL_FLOAT, 0, texCoordArray);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
#endif // !QT_OPENGL_ES_2
/*!
\since 4.4
This function supports the following use cases:
\list
\li On OpenGL and OpenGL ES 1.x it draws the given texture, \a textureId,
to the given target rectangle, \a target, in OpenGL model space. The
\a textureTarget should be a 2D texture target.
\li On OpenGL and OpenGL ES 2.x, if a painter is active, not inside a
beginNativePainting / endNativePainting block, and uses the
engine with type QPaintEngine::OpenGL2, the function will draw the given
texture, \a textureId, to the given target rectangle, \a target,
respecting the current painter state. This will let you draw a texture
with the clip, transform, render hints, and composition mode set by the
painter. Note that the texture target needs to be GL_TEXTURE_2D for this
use case, and that this is the only supported use case under OpenGL ES 2.x.
\endlist
*/
void QGLContext::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
#if !defined(QT_OPENGL_ES) || defined(QT_OPENGL_ES_2)
if (d_ptr->active_engine &&
d_ptr->active_engine->type() == QPaintEngine::OpenGL2) {
QGL2PaintEngineEx *eng = static_cast<QGL2PaintEngineEx*>(d_ptr->active_engine);
if (!eng->isNativePaintingActive()) {
QRectF src(0, 0, target.width(), target.height());
QSize size(target.width(), target.height());
if (eng->drawTexture(target, textureId, size, src))
return;
}
}
#endif
#ifndef QT_OPENGL_ES_2
#ifdef QT_OPENGL_ES
if (textureTarget != GL_TEXTURE_2D) {
qWarning("QGLContext::drawTexture(): texture target must be GL_TEXTURE_2D on OpenGL ES");
return;
}
#else
const bool wasEnabled = glIsEnabled(GL_TEXTURE_2D);
GLint oldTexture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTexture);
#endif
glEnable(textureTarget);
glBindTexture(textureTarget, textureId);
qDrawTextureRect(target, -1, -1, textureTarget);
#ifdef QT_OPENGL_ES
glDisable(textureTarget);
#else
if (!wasEnabled)
glDisable(textureTarget);
glBindTexture(textureTarget, oldTexture);
#endif
#else
Q_UNUSED(target);
Q_UNUSED(textureId);
Q_UNUSED(textureTarget);
qWarning("drawTexture() with OpenGL ES 2.0 requires an active OpenGL2 paint engine");
#endif
}
/*!
\since 4.4
This function supports the following use cases:
\list
\li By default it draws the given texture, \a textureId,
at the given \a point in OpenGL model space. The
\a textureTarget should be a 2D texture target.
\li If a painter is active, not inside a
beginNativePainting / endNativePainting block, and uses the
engine with type QPaintEngine::OpenGL2, the function will draw the given
texture, \a textureId, at the given \a point,
respecting the current painter state. This will let you draw a texture
with the clip, transform, render hints, and composition mode set by the
painter. Note that the texture target needs to be GL_TEXTURE_2D for this
use case.
\endlist
\note This function is not supported under any version of OpenGL ES.
*/
void QGLContext::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
#ifdef QT_OPENGL_ES
Q_UNUSED(point);
Q_UNUSED(textureId);
Q_UNUSED(textureTarget);
qWarning("drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget) not supported with OpenGL ES, use rect version instead");
#else
const bool wasEnabled = glIsEnabled(GL_TEXTURE_2D);
GLint oldTexture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTexture);
glEnable(textureTarget);
glBindTexture(textureTarget, textureId);
GLint textureWidth;
GLint textureHeight;
glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_WIDTH, &textureWidth);
glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_HEIGHT, &textureHeight);
if (d_ptr->active_engine &&
d_ptr->active_engine->type() == QPaintEngine::OpenGL2) {
QGL2PaintEngineEx *eng = static_cast<QGL2PaintEngineEx*>(d_ptr->active_engine);
if (!eng->isNativePaintingActive()) {
QRectF dest(point, QSizeF(textureWidth, textureHeight));
QRectF src(0, 0, textureWidth, textureHeight);
QSize size(textureWidth, textureHeight);
if (eng->drawTexture(dest, textureId, size, src))
return;
}
}
qDrawTextureRect(QRectF(point, QSizeF(textureWidth, textureHeight)), textureWidth, textureHeight, textureTarget);
if (!wasEnabled)
glDisable(textureTarget);
glBindTexture(textureTarget, oldTexture);
#endif
}
/*!
This function sets the limit for the texture cache to \a size,
expressed in kilobytes.
By default, the cache limit is approximately 64 MB.
\sa textureCacheLimit()
*/
void QGLContext::setTextureCacheLimit(int size)
{
QGLTextureCache::instance()->setMaxCost(size);
}
/*!
Returns the current texture cache limit in kilobytes.
\sa setTextureCacheLimit()
*/
int QGLContext::textureCacheLimit()
{
return QGLTextureCache::instance()->maxCost();
}
/*!
\fn QGLFormat QGLContext::format() const
Returns the frame buffer format that was obtained (this may be a
subset of what was requested).
\sa requestedFormat()
*/
/*!
\fn QGLFormat QGLContext::requestedFormat() const
Returns the frame buffer format that was originally requested in
the constructor or setFormat().
\sa format()
*/
/*!
Sets a \a format for this context. The context is \l{reset()}{reset}.
Call create() to create a new GL context that tries to match the
new format.
\snippet code/src_opengl_qgl.cpp 7
\sa format(), reset(), create()
*/
void QGLContext::setFormat(const QGLFormat &format)
{
Q_D(QGLContext);
reset();
d->glFormat = d->reqFormat = format;
}
/*!
\internal
*/
void QGLContext::setDevice(QPaintDevice *pDev)
{
Q_D(QGLContext);
if (isValid())
reset();
d->paintDevice = pDev;
if (d->paintDevice && (d->paintDevice->devType() != QInternal::Widget
&& d->paintDevice->devType() != QInternal::Pixmap
&& d->paintDevice->devType() != QInternal::Pbuffer)) {
qWarning("QGLContext: Unsupported paint device type");
}
}
/*!
\fn bool QGLContext::isValid() const
Returns true if a GL rendering context has been successfully
created; otherwise returns false.
*/
/*!
\fn void QGLContext::setValid(bool valid)
\internal
Forces the GL rendering context to be valid.
*/
/*!
\fn bool QGLContext::isSharing() const
Returns true if this context is sharing its GL context with
another QGLContext, otherwise false is returned. Note that context
sharing might not be supported between contexts with different
formats.
*/
/*!
Returns true if \a context1 and \a context2 are sharing their
GL resources such as textures, shader programs, etc;
otherwise returns false.
\since 4.6
*/
bool QGLContext::areSharing(const QGLContext *context1, const QGLContext *context2)
{
if (!context1 || !context2)
return false;
return context1->d_ptr->group == context2->d_ptr->group;
}
/*!
\fn bool QGLContext::deviceIsPixmap() const
Returns true if the paint device of this context is a pixmap;
otherwise returns false.
*/
/*!
\fn bool QGLContext::windowCreated() const
Returns true if a window has been created for this context;
otherwise returns false.
\sa setWindowCreated()
*/
/*!
\fn void QGLContext::setWindowCreated(bool on)
If \a on is true the context has had a window created for it. If
\a on is false no window has been created for the context.
\sa windowCreated()
*/
/*!
\fn uint QGLContext::colorIndex(const QColor& c) const
\internal
Returns a colormap index for the color c, in ColorIndex mode. Used
by qglColor() and qglClearColor().
*/
/*!
\fn bool QGLContext::initialized() const
Returns true if this context has been initialized, i.e. if
QGLWidget::initializeGL() has been performed on it; otherwise
returns false.
\sa setInitialized()
*/
/*!
\fn void QGLContext::setInitialized(bool on)
If \a on is true the context has been initialized, i.e.
QGLContext::setInitialized() has been called on it. If \a on is
false the context has not been initialized.
\sa initialized()
*/
/*!
\fn const QGLContext* QGLContext::currentContext()
Returns the current context, i.e. the context to which any OpenGL
commands will currently be directed. Returns 0 if no context is
current.
\sa makeCurrent()
*/
/*!
\fn QColor QGLContext::overlayTransparentColor() const
If this context is a valid context in an overlay plane, returns
the plane's transparent color. Otherwise returns an \l{QColor::isValid()}{invalid} color.
The returned color's \l{QColor::pixel()}{pixel} value is
the index of the transparent color in the colormap of the overlay
plane. (Naturally, the color's RGB values are meaningless.)
The returned QColor object will generally work as expected only
when passed as the argument to QGLWidget::qglColor() or
QGLWidget::qglClearColor(). Under certain circumstances it can
also be used to draw transparent graphics with a QPainter. See the
examples/opengl/overlay_x11 example for details.
*/
/*!
Creates the GL context. Returns true if it was successful in
creating a valid GL rendering context on the paint device
specified in the constructor; otherwise returns false (i.e. the
context is invalid).
After successful creation, format() returns the set of features of
the created GL rendering context.
If \a shareContext points to a valid QGLContext, this method will
try to establish OpenGL display list and texture object sharing
between this context and the \a shareContext. Note that this may
fail if the two contexts have different \l {format()} {formats}.
Use isSharing() to see if sharing is in effect.
\warning Implementation note: initialization of C++ class
members usually takes place in the class constructor. QGLContext
is an exception because it must be simple to customize. The
virtual functions chooseContext() (and chooseVisual() for X11) can
be reimplemented in a subclass to select a particular context. The
problem is that virtual functions are not properly called during
construction (even though this is correct C++) because C++
constructs class hierarchies from the bottom up. For this reason
we need a create() function.
\sa chooseContext(), format(), isValid()
*/
bool QGLContext::create(const QGLContext* shareContext)
{
Q_D(QGLContext);
if (!d->paintDevice && !d->guiGlContext)
return false;
reset();
d->valid = chooseContext(shareContext);
if (d->valid && d->paintDevice && d->paintDevice->devType() == QInternal::Widget) {
QWidgetPrivate *wd = qt_widget_private(static_cast<QWidget *>(d->paintDevice));
wd->usesDoubleBufferedGLContext = d->glFormat.doubleBuffer();
}
return d->valid;
}
bool QGLContext::isValid() const
{
Q_D(const QGLContext);
return d->valid;
}
void QGLContext::setValid(bool valid)
{
Q_D(QGLContext);
d->valid = valid;
}
bool QGLContext::isSharing() const
{
Q_D(const QGLContext);
return d->group->isSharing();
}
QGLFormat QGLContext::format() const
{
Q_D(const QGLContext);
return d->glFormat;
}
QGLFormat QGLContext::requestedFormat() const
{
Q_D(const QGLContext);
return d->reqFormat;
}
QPaintDevice* QGLContext::device() const
{
Q_D(const QGLContext);
return d->paintDevice;
}
bool QGLContext::deviceIsPixmap() const
{
Q_D(const QGLContext);
return d->paintDevice->devType() == QInternal::Pixmap;
}
bool QGLContext::windowCreated() const
{
Q_D(const QGLContext);
return d->crWin;
}
void QGLContext::setWindowCreated(bool on)
{
Q_D(QGLContext);
d->crWin = on;
}
bool QGLContext::initialized() const
{
Q_D(const QGLContext);
return d->initDone;
}
void QGLContext::setInitialized(bool on)
{
Q_D(QGLContext);
d->initDone = on;
}
const QGLContext* QGLContext::currentContext()
{
if (const QOpenGLContext *threadContext = QOpenGLContext::currentContext()) {
return QGLContext::fromOpenGLContext(const_cast<QOpenGLContext *>(threadContext));
}
return 0;
}
void QGLContextPrivate::setCurrentContext(QGLContext *context)
{
Q_UNUSED(context);
}
/*!
\fn bool QGLContext::chooseContext(const QGLContext* shareContext = 0)
This semi-internal function is called by create(). It creates a
system-dependent OpenGL handle that matches the format() of \a
shareContext as closely as possible, returning true if successful
or false if a suitable handle could not be found.
On Windows, it calls the virtual function choosePixelFormat(),
which finds a matching pixel format identifier. On X11, it calls
the virtual function chooseVisual() which finds an appropriate X
visual. On other platforms it may work differently.
*/
/*! \fn int QGLContext::choosePixelFormat(void* dummyPfd, HDC pdc)
\b{Win32 only:} This virtual function chooses a pixel format
that matches the OpenGL \l{setFormat()}{format}.
Reimplement this function in a subclass if you need a custom
context.
\warning The \a dummyPfd pointer and \a pdc are used as a \c
PIXELFORMATDESCRIPTOR*. We use \c void to avoid using
Windows-specific types in our header files.
\sa chooseContext()
*/
/*! \fn void *QGLContext::chooseVisual()
\b{X11 only:} This virtual function tries to find a visual that
matches the format, reducing the demands if the original request
cannot be met.
The algorithm for reducing the demands of the format is quite
simple-minded, so override this method in your subclass if your
application has spcific requirements on visual selection.
\sa chooseContext()
*/
/*! \fn void *QGLContext::tryVisual(const QGLFormat& f, int bufDepth)
\internal
\b{X11 only:} This virtual function chooses a visual that matches
the OpenGL \l{format()}{format}. Reimplement this function
in a subclass if you need a custom visual.
\sa chooseContext()
*/
/*!
\fn void QGLContext::reset()
Resets the context and makes it invalid.
\sa create(), isValid()
*/
/*!
\fn void QGLContext::makeCurrent()
Makes this context the current OpenGL rendering context. All GL
functions you call operate on this context until another context
is made current.
In some very rare cases the underlying call may fail. If this
occurs an error message is output to stderr.
*/
/*!
\fn void QGLContext::swapBuffers() const
Swaps the screen contents with an off-screen buffer. Only works if
the context is in double buffer mode.
\sa QGLFormat::setDoubleBuffer()
*/
/*!
\fn void QGLContext::doneCurrent()
Makes no GL context the current context. Normally, you do not need
to call this function; QGLContext calls it as necessary.
*/
/*!
\fn QPaintDevice* QGLContext::device() const
Returns the paint device set for this context.
\sa QGLContext::QGLContext()
*/
/*!
\obsolete
\fn void QGLContext::generateFontDisplayLists(const QFont& font, int listBase)
Generates a set of 256 display lists for the 256 first characters
in the font \a font. The first list will start at index \a listBase.
\sa QGLWidget::renderText()
*/
/*****************************************************************************
QGLWidget implementation
*****************************************************************************/
/*!
\class QGLWidget
\brief The QGLWidget class is a widget for rendering OpenGL graphics.
\ingroup painting-3D
QGLWidget provides functionality for displaying OpenGL graphics
integrated into a Qt application. It is very simple to use. You
inherit from it and use the subclass like any other QWidget,
except that you have the choice between using QPainter and
standard OpenGL rendering commands.
QGLWidget provides three convenient virtual functions that you can
reimplement in your subclass to perform the typical OpenGL tasks:
\list
\li paintGL() - Renders the OpenGL scene. Gets called whenever the widget
needs to be updated.
\li resizeGL() - Sets up the OpenGL viewport, projection, etc. Gets
called whenever the widget has been resized (and also when it
is shown for the first time because all newly created widgets get a
resize event automatically).
\li initializeGL() - Sets up the OpenGL rendering context, defines display
lists, etc. Gets called once before the first time resizeGL() or
paintGL() is called.
\endlist
Here is a rough outline of how a QGLWidget subclass might look:
\snippet code/src_opengl_qgl.cpp 8
If you need to trigger a repaint from places other than paintGL()
(a typical example is when using \l{QTimer}{timers} to
animate scenes), you should call the widget's updateGL() function.
Your widget's OpenGL rendering context is made current when
paintGL(), resizeGL(), or initializeGL() is called. If you need to
call the standard OpenGL API functions from other places (e.g. in
your widget's constructor or in your own paint functions), you
must call makeCurrent() first.
QGLWidget provides functions for requesting a new display
\l{QGLFormat}{format} and you can also create widgets with
customized rendering \l{QGLContext}{contexts}.
You can also share OpenGL display lists between QGLWidget objects (see
the documentation of the QGLWidget constructors for details).
Note that under Windows, the QGLContext belonging to a QGLWidget
has to be recreated when the QGLWidget is reparented. This is
necessary due to limitations on the Windows platform. This will
most likely cause problems for users that have subclassed and
installed their own QGLContext on a QGLWidget. It is possible to
work around this issue by putting the QGLWidget inside a dummy
widget and then reparenting the dummy widget, instead of the
QGLWidget. This will side-step the issue altogether, and is what
we recommend for users that need this kind of functionality.
On Mac OS X, when Qt is built with Cocoa support, a QGLWidget
can't have any sibling widgets placed ontop of itself. This is due
to limitations in the Cocoa API and is not supported by Apple.
\section1 Overlays
The QGLWidget creates a GL overlay context in addition to the
normal context if overlays are supported by the underlying system.
If you want to use overlays, you specify it in the
\l{QGLFormat}{format}. (Note: Overlay must be requested in the format
passed to the QGLWidget constructor.) Your GL widget should also
implement some or all of these virtual methods:
\list
\li paintOverlayGL()
\li resizeOverlayGL()
\li initializeOverlayGL()
\endlist
These methods work in the same way as the normal paintGL() etc.
functions, except that they will be called when the overlay
context is made current. You can explicitly make the overlay
context current by using makeOverlayCurrent(), and you can access
the overlay context directly (e.g. to ask for its transparent
color) by calling overlayContext().
On X servers in which the default visual is in an overlay plane,
non-GL Qt windows can also be used for overlays.
\section1 Painting Techniques
As described above, subclass QGLWidget to render pure 3D content in the
following way:
\list
\li Reimplement the QGLWidget::initializeGL() and QGLWidget::resizeGL() to
set up the OpenGL state and provide a perspective transformation.
\li Reimplement QGLWidget::paintGL() to paint the 3D scene, calling only
OpenGL functions to draw on the widget.
\endlist
It is also possible to draw 2D graphics onto a QGLWidget subclass, it is necessary
to reimplement QGLWidget::paintEvent() and do the following:
\list
\li Construct a QPainter object.
\li Initialize it for use on the widget with the QPainter::begin() function.
\li Draw primitives using QPainter's member functions.
\li Call QPainter::end() to finish painting.
\endlist
Overpainting 2D content on top of 3D content takes a little more effort.
One approach to doing this is shown in the
\l{Overpainting Example}{Overpainting} example.
\section1 Threading
As of Qt version 4.8, support for doing threaded GL rendering has
been improved. There are three scenarios that we currently support:
\list
\li 1. Buffer swapping in a thread.
Swapping buffers in a double buffered context may be a
synchronous, locking call that may be a costly operation in some
GL implementations. Especially so on embedded devices. It's not
optimal to have the CPU idling while the GPU is doing a buffer
swap. In those cases it is possible to do the rendering in the
main thread and do the actual buffer swap in a separate
thread. This can be done with the following steps:
1. Call doneCurrent() in the main thread when the rendering is
finished.
2. Notify the swapping thread that it can grab the context.
3. Make the rendering context current in the swapping thread with
makeCurrent() and then call swapBuffers().
4. Call doneCurrent() in the swapping thread and notify the main
thread that swapping is done.
Doing this will free up the main thread so that it can continue
with, for example, handling UI events or network requests. Even if
there is a context swap involved, it may be preferable compared to
having the main thread wait while the GPU finishes the swap
operation. Note that this is highly implementation dependent.
\li 2. Texture uploading in a thread.
Doing texture uploads in a thread may be very useful for
applications handling large amounts of images that needs to be
displayed, like for instance a photo gallery application. This is
supported in Qt through the existing bindTexture() API. A simple
way of doing this is to create two sharing QGLWidgets. One is made
current in the main GUI thread, while the other is made current in
the texture upload thread. The widget in the uploading thread is
never shown, it is only used for sharing textures with the main
thread. For each texture that is bound via bindTexture(), notify
the main thread so that it can start using the texture.
\li 3. Using QPainter to draw into a QGLWidget in a thread.
In Qt 4.8, it is possible to draw into a QGLWidget using a
QPainter in a separate thread. Note that this is also possible for
QGLPixelBuffers and QGLFramebufferObjects. Since this is only
supported in the GL 2 paint engine, OpenGL 2.0 or OpenGL ES 2.0 is
required.
QGLWidgets can only be created in the main GUI thread. This means
a call to doneCurrent() is necessary to release the GL context
from the main thread, before the widget can be drawn into by
another thread. Also, the main GUI thread will dispatch resize and
paint events to a QGLWidget when the widget is resized, or parts
of it becomes exposed or needs redrawing. It is therefore
necessary to handle those events because the default
implementations inside QGLWidget will try to make the QGLWidget's
context current, which again will interfere with any threads
rendering into the widget. Reimplement QGLWidget::paintEvent() and
QGLWidget::resizeEvent() to notify the rendering thread that a
resize or update is necessary, and be careful not to call the base
class implementation. If you are rendering an animation, it might
not be necessary to handle the paint event at all since the
rendering thread is doing regular updates. Then it would be enough
to reimplement QGLWidget::paintEvent() to do nothing.
\endlist
As a general rule when doing threaded rendering: be aware that
binding and releasing contexts in different threads have to be
synchronized by the user. A GL rendering context can only be
current in one thread at any time. If you try to open a QPainter
on a QGLWidget and the widget's rendering context is current in
another thread, it will fail.
In addition to this, rendering using raw GL calls in a separate
thread is supported.
\e{OpenGL is a trademark of Silicon Graphics, Inc. in the United States and other
countries.}
\sa QGLPixelBuffer, {Hello GL Example}, {2D Painting Example}, {Overpainting Example},
{Grabber Example}
*/
/*!
Constructs an OpenGL widget with a \a parent widget.
The \l{QGLFormat::defaultFormat()}{default format} is
used. The widget will be \l{isValid()}{invalid} if the
system has no \l{QGLFormat::hasOpenGL()}{OpenGL support}.
The \a parent and widget flag, \a f, arguments are passed
to the QWidget constructor.
If \a shareWidget is a valid QGLWidget, this widget will share
OpenGL display lists and texture objects with \a shareWidget. But
if \a shareWidget and this widget have different \l {format()}
{formats}, sharing might not be possible. You can check whether
sharing is in effect by calling isSharing().
The initialization of OpenGL rendering state, etc. should be done
by overriding the initializeGL() function, rather than in the
constructor of your QGLWidget subclass.
\sa QGLFormat::defaultFormat(), {Textures Example}
*/
QGLWidget::QGLWidget(QWidget *parent, const QGLWidget* shareWidget, Qt::WindowFlags f)
: QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
Q_D(QGLWidget);
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);
setAutoFillBackground(true); // for compatibility
d->init(new QGLContext(QGLFormat::defaultFormat(), this), shareWidget);
}
/*!
\internal
*/
QGLWidget::QGLWidget(QGLWidgetPrivate &dd, const QGLFormat &format, QWidget *parent, const QGLWidget *shareWidget, Qt::WindowFlags f)
: QWidget(dd, parent, f | Qt::MSWindowsOwnDC)
{
Q_D(QGLWidget);
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);
setAutoFillBackground(true); // for compatibility
d->init(new QGLContext(format, this), shareWidget);
}
/*!
Constructs an OpenGL widget with parent \a parent.
The \a format argument specifies the desired
\l{QGLFormat}{rendering options}.
If the underlying OpenGL/Window system
cannot satisfy all the features requested in \a format, the
nearest subset of features will be used. After creation, the
format() method will return the actual format obtained.
The widget will be \l{isValid()}{invalid} if the system
has no \l{QGLFormat::hasOpenGL()}{OpenGL support}.
The \a parent and widget flag, \a f, arguments are passed
to the QWidget constructor.
If \a shareWidget is a valid QGLWidget, this widget will share
OpenGL display lists and texture objects with \a shareWidget. But
if \a shareWidget and this widget have different \l {format()}
{formats}, sharing might not be possible. You can check whether
sharing is in effect by calling isSharing().
The initialization of OpenGL rendering state, etc. should be done
by overriding the initializeGL() function, rather than in the
constructor of your QGLWidget subclass.
\sa QGLFormat::defaultFormat(), isValid()
*/
QGLWidget::QGLWidget(const QGLFormat &format, QWidget *parent, const QGLWidget* shareWidget,
Qt::WindowFlags f)
: QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
Q_D(QGLWidget);
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);
setAutoFillBackground(true); // for compatibility
d->init(new QGLContext(format, this), shareWidget);
}
/*!
Constructs an OpenGL widget with parent \a parent.
The \a context argument is a pointer to the QGLContext that
you wish to be bound to this widget. This allows you to pass in
your own QGLContext sub-classes.
The widget will be \l{isValid()}{invalid} if the system
has no \l{QGLFormat::hasOpenGL()}{OpenGL support}.
The \a parent and widget flag, \a f, arguments are passed
to the QWidget constructor.
If \a shareWidget is a valid QGLWidget, this widget will share
OpenGL display lists and texture objects with \a shareWidget. But
if \a shareWidget and this widget have different \l {format()}
{formats}, sharing might not be possible. You can check whether
sharing is in effect by calling isSharing().
The initialization of OpenGL rendering state, etc. should be done
by overriding the initializeGL() function, rather than in the
constructor of your QGLWidget subclass.
\sa QGLFormat::defaultFormat(), isValid()
*/
QGLWidget::QGLWidget(QGLContext *context, QWidget *parent, const QGLWidget *shareWidget,
Qt::WindowFlags f)
: QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
Q_D(QGLWidget);
setAttribute(Qt::WA_PaintOnScreen);
setAttribute(Qt::WA_NoSystemBackground);
setAutoFillBackground(true); // for compatibility
d->init(context, shareWidget);
}
/*!
Destroys the widget.
*/
QGLWidget::~QGLWidget()
{
Q_D(QGLWidget);
delete d->glcx;
d->glcx = 0;
d->cleanupColormaps();
}
/*!
\fn QGLFormat QGLWidget::format() const
Returns the format of the contained GL rendering context.
*/
/*!
\fn bool QGLWidget::doubleBuffer() const
Returns true if the contained GL rendering context has double
buffering; otherwise returns false.
\sa QGLFormat::doubleBuffer()
*/
/*!
\fn void QGLWidget::setAutoBufferSwap(bool on)
If \a on is true automatic GL buffer swapping is switched on;
otherwise it is switched off.
If \a on is true and the widget is using a double-buffered format,
the background and foreground GL buffers will automatically be
swapped after each paintGL() call.
The buffer auto-swapping is on by default.
\sa autoBufferSwap(), doubleBuffer(), swapBuffers()
*/
/*!
\fn bool QGLWidget::autoBufferSwap() const
Returns true if the widget is doing automatic GL buffer swapping;
otherwise returns false.
\sa setAutoBufferSwap()
*/
/*!
\fn QFunctionPointer QGLContext::getProcAddress() const
Returns a function pointer to the GL extension function passed in
\a proc. 0 is returned if a pointer to the function could not be
obtained.
*/
/*!
\fn bool QGLWidget::isValid() const
Returns true if the widget has a valid GL rendering context;
otherwise returns false. A widget will be invalid if the system
has no \l{QGLFormat::hasOpenGL()}{OpenGL support}.
*/
bool QGLWidget::isValid() const
{
Q_D(const QGLWidget);
return d->glcx && d->glcx->isValid();
}
/*!
\fn bool QGLWidget::isSharing() const
Returns true if this widget's GL context is shared with another GL
context, otherwise false is returned. Context sharing might not be
possible if the widgets use different formats.
\sa format()
*/
bool QGLWidget::isSharing() const
{
Q_D(const QGLWidget);
return d->glcx->isSharing();
}
/*!
\fn void QGLWidget::makeCurrent()
Makes this widget the current widget for OpenGL operations, i.e.
makes the widget's rendering context the current OpenGL rendering
context.
*/
void QGLWidget::makeCurrent()
{
Q_D(QGLWidget);
d->glcx->makeCurrent();
}
/*!
\fn void QGLWidget::doneCurrent()
Makes no GL context the current context. Normally, you do not need
to call this function; QGLContext calls it as necessary. However,
it may be useful in multithreaded environments.
*/
void QGLWidget::doneCurrent()
{
Q_D(QGLWidget);
d->glcx->doneCurrent();
}
/*!
\fn void QGLWidget::swapBuffers()
Swaps the screen contents with an off-screen buffer. This only
works if the widget's format specifies double buffer mode.
Normally, there is no need to explicitly call this function
because it is done automatically after each widget repaint, i.e.
each time after paintGL() has been executed.
\sa doubleBuffer(), setAutoBufferSwap(), QGLFormat::setDoubleBuffer()
*/
void QGLWidget::swapBuffers()
{
Q_D(QGLWidget);
d->glcx->swapBuffers();
}
/*!
\fn const QGLContext* QGLWidget::overlayContext() const
Returns the overlay context of this widget, or 0 if this widget
has no overlay.
\sa context()
*/
/*!
\fn void QGLWidget::makeOverlayCurrent()
Makes the overlay context of this widget current. Use this if you
need to issue OpenGL commands to the overlay context outside of
initializeOverlayGL(), resizeOverlayGL(), and paintOverlayGL().
Does nothing if this widget has no overlay.
\sa makeCurrent()
*/
/*!
\obsolete
Sets a new format for this widget.
If the underlying OpenGL/Window system cannot satisfy all the
features requested in \a format, the nearest subset of features will
be used. After creation, the format() method will return the actual
rendering context format obtained.
The widget will be assigned a new QGLContext, and the initializeGL()
function will be executed for this new context before the first
resizeGL() or paintGL().
This method will try to keep display list and texture object sharing
in effect with other QGLWidget objects, but changing the format might make
sharing impossible. Use isSharing() to see if sharing is still in
effect.
\sa format(), isSharing(), isValid()
*/
void QGLWidget::setFormat(const QGLFormat &format)
{
setContext(new QGLContext(format,this));
}
/*!
\fn const QGLContext *QGLWidget::context() const
Returns the context of this widget.
It is possible that the context is not valid (see isValid()), for
example, if the underlying hardware does not support the format
attributes that were requested.
*/
/*
\fn void QGLWidget::setContext(QGLContext *context,
const QGLContext* shareContext,
bool deleteOldContext)
\obsolete
Sets a new context for this widget. The QGLContext \a context must
be created using \e new. QGLWidget will delete \a context when
another context is set or when the widget is destroyed.
If \a context is invalid, QGLContext::create() is performed on
it. The initializeGL() function will then be executed for the new
context before the first resizeGL() or paintGL().
If \a context is invalid, this method will try to keep display list
and texture object sharing in effect, or (if \a shareContext points
to a valid context) start display list and texture object sharing
with that context, but sharing might be impossible if the two
contexts have different \l {format()} {formats}. Use isSharing() to
see whether sharing is in effect.
If \a deleteOldContext is true (the default), the existing context
will be deleted. You may use false here if you have kept a pointer
to the old context (as returned by context()), and want to restore
that context later.
\sa context(), isSharing()
*/
/*!
\fn void QGLWidget::updateGL()
Updates the widget by calling glDraw().
*/
void QGLWidget::updateGL()
{
if (updatesEnabled() && testAttribute(Qt::WA_Mapped))
glDraw();
}
/*!
\fn void QGLWidget::updateOverlayGL()
Updates the widget's overlay (if any). Will cause the virtual
function paintOverlayGL() to be executed.
The widget's rendering context will become the current context and
initializeGL() will be called if it hasn't already been called.
*/
/*!
This virtual function is called once before the first call to
paintGL() or resizeGL(), and then once whenever the widget has
been assigned a new QGLContext. Reimplement it in a subclass.
This function should set up any required OpenGL context rendering
flags, defining display lists, etc.
There is no need to call makeCurrent() because this has already
been done when this function is called.
*/
void QGLWidget::initializeGL()
{
}
/*!
This virtual function is called whenever the widget needs to be
painted. Reimplement it in a subclass.
There is no need to call makeCurrent() because this has already
been done when this function is called.
*/
void QGLWidget::paintGL()
{
}
/*!
\fn void QGLWidget::resizeGL(int width , int height)
This virtual function is called whenever the widget has been
resized. The new size is passed in \a width and \a height.
Reimplement it in a subclass.
There is no need to call makeCurrent() because this has already
been done when this function is called.
*/
void QGLWidget::resizeGL(int, int)
{
}
/*!
This virtual function is used in the same manner as initializeGL()
except that it operates on the widget's overlay context instead of
the widget's main context. This means that initializeOverlayGL()
is called once before the first call to paintOverlayGL() or
resizeOverlayGL(). Reimplement it in a subclass.
This function should set up any required OpenGL context rendering
flags, defining display lists, etc. for the overlay context.
There is no need to call makeOverlayCurrent() because this has
already been done when this function is called.
*/
void QGLWidget::initializeOverlayGL()
{
}
/*!
This virtual function is used in the same manner as paintGL()
except that it operates on the widget's overlay context instead of
the widget's main context. This means that paintOverlayGL() is
called whenever the widget's overlay needs to be painted.
Reimplement it in a subclass.
There is no need to call makeOverlayCurrent() because this has
already been done when this function is called.
*/
void QGLWidget::paintOverlayGL()
{
}
/*!
\fn void QGLWidget::resizeOverlayGL(int width , int height)
This virtual function is used in the same manner as paintGL()
except that it operates on the widget's overlay context instead of
the widget's main context. This means that resizeOverlayGL() is
called whenever the widget has been resized. The new size is
passed in \a width and \a height. Reimplement it in a subclass.
There is no need to call makeOverlayCurrent() because this has
already been done when this function is called.
*/
void QGLWidget::resizeOverlayGL(int, int)
{
}
/*!
\fn void QGLWidget::paintEvent(QPaintEvent *event)
Handles paint events passed in the \a event parameter. Will cause
the virtual paintGL() function to be called.
The widget's rendering context will become the current context and
initializeGL() will be called if it hasn't already been called.
*/
void QGLWidget::paintEvent(QPaintEvent *)
{
if (updatesEnabled()) {
glDraw();
updateOverlayGL();
}
}
/*!
\fn void QGLWidget::resizeEvent(QResizeEvent *event)
Handles resize events that are passed in the \a event parameter.
Calls the virtual function resizeGL().
*/
/*!
\fn void QGLWidget::setMouseTracking(bool enable)
If \a enable is true then mouse tracking is enabled; otherwise it
is disabled.
*/
/*!
Renders the current scene on a pixmap and returns the pixmap.
You can use this method on both visible and invisible QGLWidget objects.
This method will create a pixmap and a temporary QGLContext to
render on the pixmap. It will then call initializeGL(),
resizeGL(), and paintGL() on this context. Finally, the widget's
original GL context is restored.
The size of the pixmap will be \a w pixels wide and \a h pixels
high unless one of these parameters is 0 (the default), in which
case the pixmap will have the same size as the widget.
If \a useContext is true, this method will try to be more
efficient by using the existing GL context to render the pixmap.
The default is false. Only use true if you understand the risks.
Note that under Windows a temporary context has to be created
and usage of the \e useContext parameter is not supported.
Overlays are not rendered onto the pixmap.
If the GL rendering context and the desktop have different bit
depths, the result will most likely look surprising.
Note that the creation of display lists, modifications of the view
frustum etc. should be done from within initializeGL(). If this is
not done, the temporary QGLContext will not be initialized
properly, and the rendered pixmap may be incomplete/corrupted.
*/
QPixmap QGLWidget::renderPixmap(int w, int h, bool useContext)
{
Q_D(QGLWidget);
QSize sz = size();
if ((w > 0) && (h > 0))
sz = QSize(w, h);
QPixmap pm(sz);
d->glcx->doneCurrent();
bool success = true;
if (useContext && isValid() && d->renderCxPm(&pm))
return pm;
QGLFormat fmt = d->glcx->requestedFormat();
fmt.setDirectRendering(false); // Direct is unlikely to work
fmt.setDoubleBuffer(false); // We don't need dbl buf
QGLContext* ocx = d->glcx;
ocx->doneCurrent();
d->glcx = new QGLContext(fmt, &pm);
d->glcx->create();
if (d->glcx->isValid())
updateGL();
else
success = false;
delete d->glcx;
d->glcx = ocx;
ocx->makeCurrent();
if (success) {
return pm;
}
return QPixmap();
}
/*!
Returns an image of the frame buffer. If \a withAlpha is true the
alpha channel is included.
Depending on your hardware, you can explicitly select which color
buffer to grab with a glReadBuffer() call before calling this
function.
*/
QImage QGLWidget::grabFrameBuffer(bool withAlpha)
{
makeCurrent();
QImage res;
int w = width();
int h = height();
if (format().rgba())
res = qt_gl_read_framebuffer(QSize(w, h), format().alpha(), withAlpha);
return res;
}
/*!
Initializes OpenGL for this widget's context. Calls the virtual
function initializeGL().
*/
void QGLWidget::glInit()
{
Q_D(QGLWidget);
if (!isValid())
return;
makeCurrent();
initializeGL();
d->glcx->setInitialized(true);
}
/*!
Executes the virtual function paintGL().
The widget's rendering context will become the current context and
initializeGL() will be called if it hasn't already been called.
*/
void QGLWidget::glDraw()
{
Q_D(QGLWidget);
if (!isValid())
return;
makeCurrent();
#ifndef QT_OPENGL_ES
if (d->glcx->deviceIsPixmap())
glDrawBuffer(GL_FRONT);
#endif
if (!d->glcx->initialized()) {
glInit();
resizeGL(d->glcx->device()->width(), d->glcx->device()->height()); // New context needs this "resize"
}
paintGL();
if (doubleBuffer()) {
if (d->autoSwap)
swapBuffers();
} else {
glFlush();
}
}
/*!
Convenience function for specifying a drawing color to OpenGL.
Calls glColor4 (in RGBA mode) or glIndex (in color-index mode)
with the color \a c. Applies to this widgets GL context.
\note This function is not supported on OpenGL/ES 2.0 systems.
\sa qglClearColor(), QGLContext::currentContext(), QColor
*/
void QGLWidget::qglColor(const QColor& c) const
{
#if !defined(QT_OPENGL_ES_2)
#ifdef QT_OPENGL_ES
glColor4f(c.redF(), c.greenF(), c.blueF(), c.alphaF());
#else
Q_D(const QGLWidget);
const QGLContext *ctx = QGLContext::currentContext();
if (ctx) {
if (ctx->format().rgba())
glColor4f(c.redF(), c.greenF(), c.blueF(), c.alphaF());
else if (!d->cmap.isEmpty()) { // QGLColormap in use?
int i = d->cmap.find(c.rgb());
if (i < 0)
i = d->cmap.findNearest(c.rgb());
glIndexi(i);
} else
glIndexi(ctx->colorIndex(c));
}
#endif //QT_OPENGL_ES
#else
Q_UNUSED(c);
#endif //QT_OPENGL_ES_2
}
/*!
Convenience function for specifying the clearing color to OpenGL.
Calls glClearColor (in RGBA mode) or glClearIndex (in color-index
mode) with the color \a c. Applies to this widgets GL context.
\sa qglColor(), QGLContext::currentContext(), QColor
*/
void QGLWidget::qglClearColor(const QColor& c) const
{
#ifdef QT_OPENGL_ES
glClearColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
#else
Q_D(const QGLWidget);
const QGLContext *ctx = QGLContext::currentContext();
if (ctx) {
if (ctx->format().rgba())
glClearColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
else if (!d->cmap.isEmpty()) { // QGLColormap in use?
int i = d->cmap.find(c.rgb());
if (i < 0)
i = d->cmap.findNearest(c.rgb());
glClearIndex(i);
} else
glClearIndex(ctx->colorIndex(c));
}
#endif
}
/*!
Converts the image \a img into the unnamed format expected by
OpenGL functions such as glTexImage2D(). The returned image is not
usable as a QImage, but QImage::width(), QImage::height() and
QImage::bits() may be used with OpenGL. The GL format used is
\c GL_RGBA.
\omit ###
\l opengl/texture example
The following few lines are from the texture example. Most of the
code is irrelevant, so we just quote the relevant bits:
\quotefromfile opengl/texture/gltexobj.cpp
\skipto tex1
\printline tex1
\printline gllogo.bmp
We create \e tex1 (and another variable) for OpenGL, and load a real
image into \e buf.
\skipto convertToGLFormat
\printline convertToGLFormat
A few lines later, we convert \e buf into OpenGL format and store it
in \e tex1.
\skipto glTexImage2D
\printline glTexImage2D
\printline tex1.bits
Note the dimension restrictions for texture images as described in
the glTexImage2D() documentation. The width must be 2^m + 2*border
and the height 2^n + 2*border where m and n are integers and
border is either 0 or 1.
Another function in the same example uses \e tex1 with OpenGL.
\endomit
*/
QImage QGLWidget::convertToGLFormat(const QImage& img)
{
QImage res(img.size(), QImage::Format_ARGB32);
convertToGLFormatHelper(res, img.convertToFormat(QImage::Format_ARGB32), GL_RGBA);
return res;
}
/*!
\fn QGLColormap & QGLWidget::colormap() const
Returns the colormap for this widget.
Usually it is only top-level widgets that can have different
colormaps installed. Asking for the colormap of a child widget
will return the colormap for the child's top-level widget.
If no colormap has been set for this widget, the QGLColormap
returned will be empty.
\sa setColormap(), QGLColormap::isEmpty()
*/
/*!
\fn void QGLWidget::setColormap(const QGLColormap & cmap)
Set the colormap for this widget to \a cmap. Usually it is only
top-level widgets that can have colormaps installed.
\sa colormap()
*/
/*!
\obsolete
Returns the value of the first display list that is generated for
the characters in the given \a font. \a listBase indicates the base
value used when generating the display lists for the font. The
default value is 2000.
\note This function is not supported on OpenGL/ES systems.
*/
int QGLWidget::fontDisplayListBase(const QFont & font, int listBase)
{
#ifndef QT_OPENGL_ES
Q_D(QGLWidget);
int base;
if (!d->glcx) { // this can't happen unless we run out of mem
return 0;
}
// always regenerate font disp. lists for pixmaps - hw accelerated
// contexts can't handle this otherwise
bool regenerate = d->glcx->deviceIsPixmap();
#ifndef QT_NO_FONTCONFIG
// font color needs to be part of the font cache key when using
// antialiased fonts since one set of glyphs needs to be generated
// for each font color
QString color_key;
if (font.styleStrategy() != QFont::NoAntialias) {
GLfloat color[4];
glGetFloatv(GL_CURRENT_COLOR, color);
color_key.sprintf("%f_%f_%f",color[0], color[1], color[2]);
}
QString key = font.key() + color_key + QString::number((int) regenerate);
#else
QString key = font.key() + QString::number((int) regenerate);
#endif
if (!regenerate && (d->displayListCache.find(key) != d->displayListCache.end())) {
base = d->displayListCache[key];
} else {
int maxBase = listBase - 256;
QMap<QString,int>::ConstIterator it;
for (it = d->displayListCache.constBegin(); it != d->displayListCache.constEnd(); ++it) {
if (maxBase < it.value()) {
maxBase = it.value();
}
}
maxBase += 256;
d->glcx->generateFontDisplayLists(font, maxBase);
d->displayListCache[key] = maxBase;
base = maxBase;
}
return base;
#else // QT_OPENGL_ES
Q_UNUSED(font);
Q_UNUSED(listBase);
return 0;
#endif
}
#ifndef QT_OPENGL_ES
static void qt_save_gl_state()
{
glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glShadeModel(GL_FLAT);
glDisable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
glDisable(GL_STENCIL_TEST);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
static void qt_restore_gl_state()
{
glMatrixMode(GL_TEXTURE);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
glPopClientAttrib();
}
static void qt_gl_draw_text(QPainter *p, int x, int y, const QString &str,
const QFont &font)
{
GLfloat color[4];
glGetFloatv(GL_CURRENT_COLOR, &color[0]);
QColor col;
col.setRgbF(color[0], color[1], color[2],color[3]);
QPen old_pen = p->pen();
QFont old_font = p->font();
p->setPen(col);
p->setFont(font);
p->drawText(x, y, str);
p->setPen(old_pen);
p->setFont(old_font);
}
#endif // !QT_OPENGL_ES
/*!
Renders the string \a str into the GL context of this widget.
\a x and \a y are specified in window coordinates, with the origin
in the upper left-hand corner of the window. If \a font is not
specified, the currently set application font will be used to
render the string. To change the color of the rendered text you can
use the glColor() call (or the qglColor() convenience function),
just before the renderText() call.
The \a listBase parameter is obsolete and will be removed in a
future version of Qt.
\note This function clears the stencil buffer.
\note This function is not supported on OpenGL/ES systems.
\note This function temporarily disables depth-testing when the
text is drawn.
\note This function can only be used inside a
QPainter::beginNativePainting()/QPainter::endNativePainting() block
if the default OpenGL paint engine is QPaintEngine::OpenGL. To make
QPaintEngine::OpenGL the default GL engine, call
QGL::setPreferredPaintEngine(QPaintEngine::OpenGL) before the
QApplication constructor.
\l{Overpainting Example}{Overpaint} with QPainter::drawText() instead.
*/
void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font, int)
{
#ifndef QT_OPENGL_ES
Q_D(QGLWidget);
if (str.isEmpty() || !isValid())
return;
GLint view[4];
bool use_scissor_testing = glIsEnabled(GL_SCISSOR_TEST);
if (!use_scissor_testing)
glGetIntegerv(GL_VIEWPORT, &view[0]);
int width = d->glcx->device()->width();
int height = d->glcx->device()->height();
bool auto_swap = autoBufferSwap();
QPaintEngine *engine = paintEngine();
if (engine && engine->isActive()) {
qWarning("QGLWidget::renderText(): Calling renderText() while a GL 2 paint engine is"
" active on the same device is not allowed.");
return;
}
QPainter *p;
bool reuse_painter = false;
if (engine->isActive()) {
reuse_painter = true;
p = engine->painter();
qt_save_gl_state();
glDisable(GL_DEPTH_TEST);
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, height, 0, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
} else {
setAutoBufferSwap(false);
// disable glClear() as a result of QPainter::begin()
d->disable_clear_on_painter_begin = true;
p = new QPainter(this);
}
QRect viewport(view[0], view[1], view[2], view[3]);
if (!use_scissor_testing && viewport != rect()) {
// if the user hasn't set a scissor box, we set one that
// covers the current viewport
glScissor(view[0], view[1], view[2], view[3]);
glEnable(GL_SCISSOR_TEST);
} else if (use_scissor_testing) {
// use the scissor box set by the user
glEnable(GL_SCISSOR_TEST);
}
qt_gl_draw_text(p, x, y, str, font);
if (reuse_painter) {
qt_restore_gl_state();
} else {
p->end();
delete p;
setAutoBufferSwap(auto_swap);
d->disable_clear_on_painter_begin = false;
}
#else // QT_OPENGL_ES
Q_UNUSED(x);
Q_UNUSED(y);
Q_UNUSED(str);
Q_UNUSED(font);
qWarning("QGLWidget::renderText is not supported under OpenGL/ES");
#endif
}
/*! \overload
\a x, \a y and \a z are specified in scene or object coordinates
relative to the currently set projection and model matrices. This
can be useful if you want to annotate models with text labels and
have the labels move with the model as it is rotated etc.
\note This function is not supported on OpenGL/ES systems.
\note If depth testing is enabled before this function is called,
then the drawn text will be depth-tested against the models that
have already been drawn in the scene. Use \c{glDisable(GL_DEPTH_TEST)}
before calling this function to annotate the models without
depth-testing the text.
\l{Overpainting Example}{Overpaint} with QPainter::drawText() instead.
*/
void QGLWidget::renderText(double x, double y, double z, const QString &str, const QFont &font, int)
{
#ifndef QT_OPENGL_ES
Q_D(QGLWidget);
if (str.isEmpty() || !isValid())
return;
bool auto_swap = autoBufferSwap();
int width = d->glcx->device()->width();
int height = d->glcx->device()->height();
GLdouble model[4][4], proj[4][4];
GLint view[4];
glGetDoublev(GL_MODELVIEW_MATRIX, &model[0][0]);
glGetDoublev(GL_PROJECTION_MATRIX, &proj[0][0]);
glGetIntegerv(GL_VIEWPORT, &view[0]);
GLdouble win_x = 0, win_y = 0, win_z = 0;
qgluProject(x, y, z, &model[0][0], &proj[0][0], &view[0],
&win_x, &win_y, &win_z);
win_y = height - win_y; // y is inverted
QPaintEngine *engine = paintEngine();
if (engine && engine->isActive()) {
qWarning("QGLWidget::renderText(): Calling renderText() while a GL 2 paint engine is"
" active on the same device is not allowed.");
return;
}
QPainter *p;
bool reuse_painter = false;
bool use_depth_testing = glIsEnabled(GL_DEPTH_TEST);
bool use_scissor_testing = glIsEnabled(GL_SCISSOR_TEST);
if (engine->isActive()) {
reuse_painter = true;
p = engine->painter();
qt_save_gl_state();
} else {
setAutoBufferSwap(false);
// disable glClear() as a result of QPainter::begin()
d->disable_clear_on_painter_begin = true;
p = new QPainter(this);
}
QRect viewport(view[0], view[1], view[2], view[3]);
if (!use_scissor_testing && viewport != rect()) {
glScissor(view[0], view[1], view[2], view[3]);
glEnable(GL_SCISSOR_TEST);
} else if (use_scissor_testing) {
glEnable(GL_SCISSOR_TEST);
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0, 0, width, height);
glOrtho(0, width, height, 0, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glAlphaFunc(GL_GREATER, 0.0);
glEnable(GL_ALPHA_TEST);
if (use_depth_testing)
glEnable(GL_DEPTH_TEST);
glTranslated(0, 0, -win_z);
qt_gl_draw_text(p, qRound(win_x), qRound(win_y), str, font);
if (reuse_painter) {
qt_restore_gl_state();
} else {
p->end();
delete p;
setAutoBufferSwap(auto_swap);
d->disable_clear_on_painter_begin = false;
}
#else // QT_OPENGL_ES
Q_UNUSED(x);
Q_UNUSED(y);
Q_UNUSED(z);
Q_UNUSED(str);
Q_UNUSED(font);
qWarning("QGLWidget::renderText is not supported under OpenGL/ES");
#endif
}
QGLFormat QGLWidget::format() const
{
Q_D(const QGLWidget);
return d->glcx->format();
}
const QGLContext *QGLWidget::context() const
{
Q_D(const QGLWidget);
return d->glcx;
}
bool QGLWidget::doubleBuffer() const
{
Q_D(const QGLWidget);
return d->glcx->d_ptr->glFormat.testOption(QGL::DoubleBuffer);
}
void QGLWidget::setAutoBufferSwap(bool on)
{
Q_D(QGLWidget);
d->autoSwap = on;
}
bool QGLWidget::autoBufferSwap() const
{
Q_D(const QGLWidget);
return d->autoSwap;
}
/*!
Calls QGLContext:::bindTexture(\a image, \a target, \a format) on the currently
set context.
\sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QImage &image, GLenum target, GLint format)
{
if (image.isNull())
return 0;
Q_D(QGLWidget);
return d->glcx->bindTexture(image, target, format, QGLContext::DefaultBindOption);
}
/*!
\overload
\since 4.6
The binding \a options are a set of options used to decide how to
bind the texture to the context.
*/
GLuint QGLWidget::bindTexture(const QImage &image, GLenum target, GLint format, QGLContext::BindOptions options)
{
if (image.isNull())
return 0;
Q_D(QGLWidget);
return d->glcx->bindTexture(image, target, format, options);
}
/*!
Calls QGLContext:::bindTexture(\a pixmap, \a target, \a format) on the currently
set context.
\sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QPixmap &pixmap, GLenum target, GLint format)
{
if (pixmap.isNull())
return 0;
Q_D(QGLWidget);
return d->glcx->bindTexture(pixmap, target, format, QGLContext::DefaultBindOption);
}
/*!
\overload
\since 4.6
Generates and binds a 2D GL texture to the current context, based
on \a pixmap. The generated texture id is returned and can be used in
The binding \a options are a set of options used to decide how to
bind the texture to the context.
*/
GLuint QGLWidget::bindTexture(const QPixmap &pixmap, GLenum target, GLint format,
QGLContext::BindOptions options)
{
Q_D(QGLWidget);
return d->glcx->bindTexture(pixmap, target, format, options);
}
/*! \overload
Calls QGLContext::bindTexture(\a fileName) on the currently set context.
\sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QString &fileName)
{
Q_D(QGLWidget);
return d->glcx->bindTexture(fileName);
}
/*!
Calls QGLContext::deleteTexture(\a id) on the currently set
context.
\sa bindTexture()
*/
void QGLWidget::deleteTexture(GLuint id)
{
Q_D(QGLWidget);
d->glcx->deleteTexture(id);
}
/*!
\since 4.4
Calls the corresponding QGLContext::drawTexture() with
\a target, \a textureId, and \a textureTarget for this
widget's context.
*/
void QGLWidget::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
Q_D(QGLWidget);
d->glcx->drawTexture(target, textureId, textureTarget);
}
/*!
\since 4.4
Calls the corresponding QGLContext::drawTexture() with
\a point, \a textureId, and \a textureTarget for this
widget's context.
*/
void QGLWidget::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
Q_D(QGLWidget);
d->glcx->drawTexture(point, textureId, textureTarget);
}
Q_GLOBAL_STATIC(QGLEngineThreadStorage<QGL2PaintEngineEx>, qt_gl_2_engine)
Q_OPENGL_EXPORT QPaintEngine* qt_qgl_paint_engine()
{
return qt_gl_2_engine()->engine();
}
/*!
\internal
Returns the GL widget's paint engine.
*/
QPaintEngine *QGLWidget::paintEngine() const
{
return qt_qgl_paint_engine();
}
typedef const GLubyte * (QGLF_APIENTRYP qt_glGetStringi)(GLenum, GLuint);
#ifndef GL_NUM_EXTENSIONS
#define GL_NUM_EXTENSIONS 0x821D
#endif
QGLExtensionMatcher::QGLExtensionMatcher(const char *str)
{
init(str);
}
QGLExtensionMatcher::QGLExtensionMatcher()
{
const char *extensionStr = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));
if (extensionStr) {
init(extensionStr);
} else {
// clear error state
while (glGetError()) {}
const QGLContext *ctx = QGLContext::currentContext();
if (ctx) {
qt_glGetStringi glGetStringi = (qt_glGetStringi)ctx->getProcAddress(QLatin1String("glGetStringi"));
GLint numExtensions;
glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
for (int i = 0; i < numExtensions; ++i) {
const char *str = reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i));
m_offsets << m_extensions.size();
while (*str != 0)
m_extensions.append(*str++);
m_extensions.append(' ');
}
}
}
}
void QGLExtensionMatcher::init(const char *str)
{
m_extensions = str;
// make sure extension string ends with a space
if (!m_extensions.endsWith(' '))
m_extensions.append(' ');
int index = 0;
int next = 0;
while ((next = m_extensions.indexOf(' ', index)) >= 0) {
m_offsets << index;
index = next + 1;
}
}
/*
Returns the GL extensions for the current context.
*/
QGLExtensions::Extensions QGLExtensions::currentContextExtensions()
{
QGLExtensionMatcher extensions;
Extensions glExtensions;
if (extensions.match("GL_ARB_texture_rectangle"))
glExtensions |= TextureRectangle;
if (extensions.match("GL_ARB_multisample"))
glExtensions |= SampleBuffers;
if (extensions.match("GL_SGIS_generate_mipmap"))
glExtensions |= GenerateMipmap;
if (extensions.match("GL_ARB_texture_compression"))
glExtensions |= TextureCompression;
if (extensions.match("GL_EXT_texture_compression_s3tc"))
glExtensions |= DDSTextureCompression;
if (extensions.match("GL_OES_compressed_ETC1_RGB8_texture"))
glExtensions |= ETC1TextureCompression;
if (extensions.match("GL_IMG_texture_compression_pvrtc"))
glExtensions |= PVRTCTextureCompression;
if (extensions.match("GL_ARB_fragment_program"))
glExtensions |= FragmentProgram;
if (extensions.match("GL_ARB_fragment_shader"))
glExtensions |= FragmentShader;
if (extensions.match("GL_ARB_shader_objects"))
glExtensions |= FragmentShader;
if (extensions.match("GL_ARB_texture_mirrored_repeat"))
glExtensions |= MirroredRepeat;
if (extensions.match("GL_EXT_framebuffer_object"))
glExtensions |= FramebufferObject;
if (extensions.match("GL_EXT_stencil_two_side"))
glExtensions |= StencilTwoSide;
if (extensions.match("GL_EXT_stencil_wrap"))
glExtensions |= StencilWrap;
if (extensions.match("GL_EXT_packed_depth_stencil"))
glExtensions |= PackedDepthStencil;
if (extensions.match("GL_NV_float_buffer"))
glExtensions |= NVFloatBuffer;
if (extensions.match("GL_ARB_pixel_buffer_object"))
glExtensions |= PixelBufferObject;
if (extensions.match("GL_IMG_texture_format_BGRA8888"))
glExtensions |= BGRATextureFormat;
#if defined(QT_OPENGL_ES_2)
glExtensions |= FramebufferObject;
glExtensions |= GenerateMipmap;
glExtensions |= FragmentShader;
#endif
#if defined(QT_OPENGL_ES)
if (extensions.match("GL_OES_packed_depth_stencil"))
glExtensions |= PackedDepthStencil;
if (extensions.match("GL_OES_element_index_uint"))
glExtensions |= ElementIndexUint;
if (extensions.match("GL_OES_depth24"))
glExtensions |= Depth24;
#else
glExtensions |= ElementIndexUint;
#endif
if (extensions.match("GL_ARB_framebuffer_object")) {
// ARB_framebuffer_object also includes EXT_framebuffer_blit.
glExtensions |= FramebufferObject;
glExtensions |= FramebufferBlit;
}
if (extensions.match("GL_EXT_framebuffer_blit"))
glExtensions |= FramebufferBlit;
if (extensions.match("GL_ARB_texture_non_power_of_two"))
glExtensions |= NPOTTextures;
if (extensions.match("GL_EXT_bgra"))
glExtensions |= BGRATextureFormat;
{
GLboolean srgbCapableFramebuffers;
glGetBooleanv(FRAMEBUFFER_SRGB_CAPABLE_EXT, &srgbCapableFramebuffers);
if (srgbCapableFramebuffers)
glExtensions |= SRGBFrameBuffer;
}
return glExtensions;
}
class QGLDefaultExtensions
{
public:
QGLDefaultExtensions() {
QGLTemporaryContext tempContext;
extensions = QGLExtensions::currentContextExtensions();
}
QGLExtensions::Extensions extensions;
};
Q_GLOBAL_STATIC(QGLDefaultExtensions, qtDefaultExtensions)
/*
Returns the GL extensions for the current QGLContext. If there is no
current QGLContext, a default context will be created and the extensions
for that context will be returned instead.
*/
QGLExtensions::Extensions QGLExtensions::glExtensions()
{
Extensions extensionFlags = 0;
QGLContext *currentCtx = const_cast<QGLContext *>(QGLContext::currentContext());
if (currentCtx && currentCtx->d_func()->extension_flags_cached)
return currentCtx->d_func()->extension_flags;
if (!currentCtx) {
extensionFlags = qtDefaultExtensions()->extensions;
} else {
extensionFlags = currentContextExtensions();
currentCtx->d_func()->extension_flags_cached = true;
currentCtx->d_func()->extension_flags = extensionFlags;
}
return extensionFlags;
}
/*
This is the shared initialization for all platforms. Called from QGLWidgetPrivate::init()
*/
void QGLWidgetPrivate::initContext(QGLContext *context, const QGLWidget* shareWidget)
{
Q_Q(QGLWidget);
glDevice.setWidget(q);
glcx = 0;
autoSwap = true;
if (context && !context->device())
context->setDevice(q);
q->setContext(context, shareWidget ? shareWidget->context() : 0);
if (!glcx)
glcx = new QGLContext(QGLFormat::defaultFormat(), q);
}
Q_GLOBAL_STATIC(QString, qt_gl_lib_name)
void qt_set_gl_library_name(const QString& name)
{
qt_gl_lib_name()->operator=(name);
}
const QString qt_gl_library_name()
{
if (qt_gl_lib_name()->isNull()) {
# if defined(QT_OPENGL_ES_2)
return QLatin1String("GLESv2");
# else
return QLatin1String("GL");
# endif
}
return *qt_gl_lib_name();
}
void QGLContextGroup::addShare(const QGLContext *context, const QGLContext *share) {
Q_ASSERT(context && share);
if (context->d_ptr->group == share->d_ptr->group)
return;
// Make sure 'context' is not already shared with another group of contexts.
Q_ASSERT(context->d_ptr->group->m_refs.load() == 1);
// Free 'context' group resources and make it use the same resources as 'share'.
QGLContextGroup *group = share->d_ptr->group;
delete context->d_ptr->group;
context->d_ptr->group = group;
group->m_refs.ref();
// Maintain a list of all the contexts in each group of sharing contexts.
// The list is empty if the "share" context wasn't sharing already.
if (group->m_shares.isEmpty())
group->m_shares.append(share);
group->m_shares.append(context);
}
void QGLContextGroup::removeShare(const QGLContext *context) {
// Remove the context from the group.
QGLContextGroup *group = context->d_ptr->group;
if (group->m_shares.isEmpty())
return;
group->m_shares.removeAll(context);
// Update context group representative.
Q_ASSERT(group->m_shares.size() != 0);
if (group->m_context == context)
group->m_context = group->m_shares[0];
// If there is only one context left, then make the list empty.
if (group->m_shares.size() == 1)
group->m_shares.clear();
}
QSize QGLTexture::bindCompressedTexture
(const QString& fileName, const char *format)
{
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly))
return QSize();
QByteArray contents = file.readAll();
file.close();
return bindCompressedTexture
(contents.constData(), contents.size(), format);
}
// PVR header format for container files that store textures compressed
// with the ETC1, PVRTC2, and PVRTC4 encodings. Format information from the
// PowerVR SDK at http://www.imgtec.com/powervr/insider/powervr-sdk.asp
// "PVRTexTool Reference Manual, version 1.11f".
struct PvrHeader
{
quint32 headerSize;
quint32 height;
quint32 width;
quint32 mipMapCount;
quint32 flags;
quint32 dataSize;
quint32 bitsPerPixel;
quint32 redMask;
quint32 greenMask;
quint32 blueMask;
quint32 alphaMask;
quint32 magic;
quint32 surfaceCount;
};
#define PVR_MAGIC 0x21525650 // "PVR!" in little-endian
#define PVR_FORMAT_MASK 0x000000FF
#define PVR_FORMAT_PVRTC2 0x00000018
#define PVR_FORMAT_PVRTC4 0x00000019
#define PVR_FORMAT_ETC1 0x00000036
#define PVR_HAS_MIPMAPS 0x00000100
#define PVR_TWIDDLED 0x00000200
#define PVR_NORMAL_MAP 0x00000400
#define PVR_BORDER_ADDED 0x00000800
#define PVR_CUBE_MAP 0x00001000
#define PVR_FALSE_COLOR_MIPMAPS 0x00002000
#define PVR_VOLUME_TEXTURE 0x00004000
#define PVR_ALPHA_IN_TEXTURE 0x00008000
#define PVR_VERTICAL_FLIP 0x00010000
#ifndef GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG
#define GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG 0x8C00
#define GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG 0x8C01
#define GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG 0x8C02
#define GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG 0x8C03
#endif
#ifndef GL_ETC1_RGB8_OES
#define GL_ETC1_RGB8_OES 0x8D64
#endif
bool QGLTexture::canBindCompressedTexture
(const char *buf, int len, const char *format, bool *hasAlpha)
{
if (QSysInfo::ByteOrder != QSysInfo::LittleEndian) {
// Compressed texture loading only supported on little-endian
// systems such as x86 and ARM at the moment.
return false;
}
if (!format) {
// Auto-detect the format from the header.
if (len >= 4 && !qstrncmp(buf, "DDS ", 4)) {
*hasAlpha = true;
return true;
} else if (len >= 52 && !qstrncmp(buf + 44, "PVR!", 4)) {
const PvrHeader *pvrHeader =
reinterpret_cast<const PvrHeader *>(buf);
*hasAlpha = (pvrHeader->alphaMask != 0);
return true;
}
} else {
// Validate the format against the header.
if (!qstricmp(format, "DDS")) {
if (len >= 4 && !qstrncmp(buf, "DDS ", 4)) {
*hasAlpha = true;
return true;
}
} else if (!qstricmp(format, "PVR") || !qstricmp(format, "ETC1")) {
if (len >= 52 && !qstrncmp(buf + 44, "PVR!", 4)) {
const PvrHeader *pvrHeader =
reinterpret_cast<const PvrHeader *>(buf);
*hasAlpha = (pvrHeader->alphaMask != 0);
return true;
}
}
}
return false;
}
#define ctx QGLContext::currentContext()
QSize QGLTexture::bindCompressedTexture
(const char *buf, int len, const char *format)
{
if (QSysInfo::ByteOrder != QSysInfo::LittleEndian) {
// Compressed texture loading only supported on little-endian
// systems such as x86 and ARM at the moment.
return QSize();
}
#if !defined(QT_OPENGL_ES)
if (!glCompressedTexImage2D) {
if (!(QGLExtensions::glExtensions() & QGLExtensions::TextureCompression)) {
qWarning("QGLContext::bindTexture(): The GL implementation does "
"not support texture compression extensions.");
return QSize();
}
glCompressedTexImage2D = (_glCompressedTexImage2DARB) ctx->getProcAddress(QLatin1String("glCompressedTexImage2DARB"));
if (!glCompressedTexImage2D) {
qWarning("QGLContext::bindTexture(): could not resolve "
"glCompressedTexImage2DARB.");
return QSize();
}
}
#endif
if (!format) {
// Auto-detect the format from the header.
if (len >= 4 && !qstrncmp(buf, "DDS ", 4))
return bindCompressedTextureDDS(buf, len);
else if (len >= 52 && !qstrncmp(buf + 44, "PVR!", 4))
return bindCompressedTexturePVR(buf, len);
} else {
// Validate the format against the header.
if (!qstricmp(format, "DDS")) {
if (len >= 4 && !qstrncmp(buf, "DDS ", 4))
return bindCompressedTextureDDS(buf, len);
} else if (!qstricmp(format, "PVR") || !qstricmp(format, "ETC1")) {
if (len >= 52 && !qstrncmp(buf + 44, "PVR!", 4))
return bindCompressedTexturePVR(buf, len);
}
}
return QSize();
}
QSize QGLTexture::bindCompressedTextureDDS(const char *buf, int len)
{
// We only support 2D texture loading at present.
if (target != GL_TEXTURE_2D)
return QSize();
// Bail out if the necessary extension is not present.
if (!(QGLExtensions::glExtensions() & QGLExtensions::DDSTextureCompression)) {
qWarning("QGLContext::bindTexture(): DDS texture compression is not supported.");
return QSize();
}
const DDSFormat *ddsHeader = reinterpret_cast<const DDSFormat *>(buf + 4);
if (!ddsHeader->dwLinearSize) {
qWarning("QGLContext::bindTexture(): DDS image size is not valid.");
return QSize();
}
int blockSize = 16;
GLenum format;
switch(ddsHeader->ddsPixelFormat.dwFourCC) {
case FOURCC_DXT1:
format = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
blockSize = 8;
break;
case FOURCC_DXT3:
format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
break;
case FOURCC_DXT5:
format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
break;
default:
qWarning("QGLContext::bindTexture(): DDS image format not supported.");
return QSize();
}
const GLubyte *pixels =
reinterpret_cast<const GLubyte *>(buf + ddsHeader->dwSize + 4);
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
int size;
int offset = 0;
int available = len - int(ddsHeader->dwSize + 4);
int w = ddsHeader->dwWidth;
int h = ddsHeader->dwHeight;
// load mip-maps
for(int i = 0; i < (int) ddsHeader->dwMipMapCount; ++i) {
if (w == 0) w = 1;
if (h == 0) h = 1;
size = ((w+3)/4) * ((h+3)/4) * blockSize;
if (size > available)
break;
glCompressedTexImage2D(GL_TEXTURE_2D, i, format, w, h, 0,
size, pixels + offset);
offset += size;
available -= size;
// half size for each mip-map level
w = w/2;
h = h/2;
}
// DDS images are not inverted.
options &= ~QGLContext::InvertedYBindOption;
return QSize(ddsHeader->dwWidth, ddsHeader->dwHeight);
}
QSize QGLTexture::bindCompressedTexturePVR(const char *buf, int len)
{
// We only support 2D texture loading at present. Cube maps later.
if (target != GL_TEXTURE_2D)
return QSize();
// Determine which texture format we will be loading.
const PvrHeader *pvrHeader = reinterpret_cast<const PvrHeader *>(buf);
GLenum textureFormat;
quint32 minWidth, minHeight;
switch (pvrHeader->flags & PVR_FORMAT_MASK) {
case PVR_FORMAT_PVRTC2:
if (pvrHeader->alphaMask)
textureFormat = GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
else
textureFormat = GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
minWidth = 16;
minHeight = 8;
break;
case PVR_FORMAT_PVRTC4:
if (pvrHeader->alphaMask)
textureFormat = GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
else
textureFormat = GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
minWidth = 8;
minHeight = 8;
break;
case PVR_FORMAT_ETC1:
textureFormat = GL_ETC1_RGB8_OES;
minWidth = 4;
minHeight = 4;
break;
default:
qWarning("QGLContext::bindTexture(): PVR image format 0x%x not supported.", int(pvrHeader->flags & PVR_FORMAT_MASK));
return QSize();
}
// Bail out if the necessary extension is not present.
if (textureFormat == GL_ETC1_RGB8_OES) {
if (!(QGLExtensions::glExtensions() &
QGLExtensions::ETC1TextureCompression)) {
qWarning("QGLContext::bindTexture(): ETC1 texture compression is not supported.");
return QSize();
}
} else {
if (!(QGLExtensions::glExtensions() &
QGLExtensions::PVRTCTextureCompression)) {
qWarning("QGLContext::bindTexture(): PVRTC texture compression is not supported.");
return QSize();
}
}
// Boundary check on the buffer size.
quint32 bufferSize = pvrHeader->headerSize + pvrHeader->dataSize;
if (bufferSize > quint32(len)) {
qWarning("QGLContext::bindTexture(): PVR image size is not valid.");
return QSize();
}
// Create the texture.
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
if (pvrHeader->mipMapCount) {
if ((options & QGLContext::LinearFilteringBindOption) != 0) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
}
} else if ((options & QGLContext::LinearFilteringBindOption) != 0) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
// Load the compressed mipmap levels.
const GLubyte *buffer =
reinterpret_cast<const GLubyte *>(buf + pvrHeader->headerSize);
bufferSize = pvrHeader->dataSize;
quint32 level = 0;
quint32 width = pvrHeader->width;
quint32 height = pvrHeader->height;
while (bufferSize > 0 && level <= pvrHeader->mipMapCount) {
quint32 size =
(qMax(width, minWidth) * qMax(height, minHeight) *
pvrHeader->bitsPerPixel) / 8;
if (size > bufferSize)
break;
glCompressedTexImage2D(GL_TEXTURE_2D, GLint(level), textureFormat,
GLsizei(width), GLsizei(height), 0,
GLsizei(size), buffer);
width /= 2;
height /= 2;
buffer += size;
++level;
}
// Restore the default pixel alignment for later texture uploads.
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
// Set the invert flag for the texture. The "vertical flip"
// flag in PVR is the opposite sense to our sense of inversion.
if ((pvrHeader->flags & PVR_VERTICAL_FLIP) != 0)
options &= ~QGLContext::InvertedYBindOption;
else
options |= QGLContext::InvertedYBindOption;
return QSize(pvrHeader->width, pvrHeader->height);
}
#undef ctx
QT_END_NAMESPACE
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