2011-04-27 10:05:43 +00:00
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/****************************************************************************
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**
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2013-01-02 11:13:29 +00:00
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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2012-09-19 12:28:29 +00:00
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** Contact: http://www.qt-project.org/legal
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2011-04-27 10:05:43 +00:00
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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2012-09-19 12:28:29 +00:00
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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2011-04-27 10:05:43 +00:00
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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2012-01-24 06:17:24 +00:00
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**
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2011-04-27 10:05:43 +00:00
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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2011-05-07 20:57:49 +00:00
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#include <QtWidgets>
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2011-04-27 10:05:43 +00:00
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#include <QtOpenGL>
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#include "glwidget.h"
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GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)
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: QGLWidget(parent, shareWidget)
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{
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clearColor = Qt::black;
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xRot = 0;
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yRot = 0;
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zRot = 0;
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program = 0;
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}
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GLWidget::~GLWidget()
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{
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}
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QSize GLWidget::minimumSizeHint() const
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{
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return QSize(50, 50);
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}
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QSize GLWidget::sizeHint() const
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{
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return QSize(200, 200);
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}
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void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle)
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{
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xRot += xAngle;
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yRot += yAngle;
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zRot += zAngle;
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updateGL();
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}
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void GLWidget::setClearColor(const QColor &color)
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{
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clearColor = color;
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updateGL();
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}
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void GLWidget::initializeGL()
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{
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2014-03-03 13:47:27 +00:00
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initializeOpenGLFunctions();
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2011-04-27 10:05:43 +00:00
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makeObject();
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_CULL_FACE);
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Dynamic GL switch on Windows
The patch introduces a new build configuration on Windows which
can be requested by passing -opengl dynamic to configure.
Platforms other than Windows (including WinRT) are not affected.
The existing Angle and desktop configurations are not affected.
These continue to function as before and Angle remains the default.
In the future, when all modules have added support for the dynamic
path, as described below, the default configuration could be changed
to be the dynamic one. This would allow providing a single set of
binaries in the official builds instead of the current two.
When requesting dynamic GL, Angle is built but QT_OPENGL_ES[_2] are
never defined. Instead, the code path that has traditionally been
desktop GL only becomes the dynamic path that has to do runtime
checks. Qt modules and applications are not linked to opengl32.dll or
libegl/glesv2.dll in this case. Instead, QtGui exports all necessary
egl/egl/gl functions which will, under the hood, forward all requests
to a dynamically loaded EGL/WGL/GL implementation.
Porting guide (better said, changes needed to prepare your code to
work with dynamic GL builds when the fallback to Angle is utilized):
1. In !QT_OPENGL_ES[_2] code branches use QOpenGLFunctions::isES() to
differentiate between desktop and ES where needed. Keep in mind that
it is the desktop GL header (plus qopenglext.h) that is included,
not the GLES one.
QtGui's proxy will handle some differences, for example calling
glClearDepth will route to glClearDepthf when needed. The built-in
eglGetProcAddress is able to retrieve pointers for standard GLES2
functions too so code resolving OpenGL 2 functions will function
in any case.
2. QT_CONFIG will contain "opengl" and "dynamicgl" in dynamic builds,
but never "angle" or "opengles2".
3. The preprocessor define QT_OPENGL_DYNAMIC is also available in
dynamic builds. The usage of this is strongly discouraged and should
not be needed anywhere except for QtGui and the platform plugin.
4. Code in need of the library handle can use
QOpenGLFunctions::platformGLHandle().
The decision on which library to load is currently based on a simple
test that creates a dummy window/context and tries to resolve an
OpenGL 2 function. If this fails, it goes for Angle. This seems to work
well on Win7 PCs for example that do not have proper graphics drivers
providing OpenGL installed but are D3D9 capable using the default drivers.
Setting QT_OPENGL to desktop or angle skips the test and forces
usage of the given GL. There are also two new application attributes
that could be used for the same purpose.
If Angle is requested but the libraries are not present, desktop is
tried. If desktop is requested, or if angle is requested but nothing
works, the EGL/WGL functions will still be callable but will return 0.
This conveniently means that eglInitialize() and such will report a failure.
Debug messages can be enabled by setting QT_OPENGLPROXY_DEBUG. This will
tell which implementation is chosen.
The textures example application is ported to OpenGL 2, the GL 1
code path is removed.
[ChangeLog][QtGui] Qt builds on Windows can now be configured for
dynamic loading of the OpenGL implementation. This can be requested
by passing -opengl dynamic to configure. In this mode no modules will
link to opengl32.dll or Angle's libegl/libglesv2. Instead, QtGui will
dynamically choose between desktop and Angle during the first GL/EGL/WGL
call. This allows deploying applications with a single set of Qt libraries
with the ability of transparently falling back to Angle in case the
opengl32.dll is not suitable, due to missing graphics drivers for example.
Task-number: QTBUG-36483
Change-Id: I716fdebbf60b355b7d9ef57d1e069eef366b4ab9
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
2014-01-27 13:45:11 +00:00
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#ifdef GL_TEXTURE_2D
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2011-04-27 10:05:43 +00:00
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glEnable(GL_TEXTURE_2D);
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#endif
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#define PROGRAM_VERTEX_ATTRIBUTE 0
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#define PROGRAM_TEXCOORD_ATTRIBUTE 1
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QGLShader *vshader = new QGLShader(QGLShader::Vertex, this);
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const char *vsrc =
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"attribute highp vec4 vertex;\n"
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"attribute mediump vec4 texCoord;\n"
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"varying mediump vec4 texc;\n"
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"uniform mediump mat4 matrix;\n"
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"void main(void)\n"
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"{\n"
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" gl_Position = matrix * vertex;\n"
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" texc = texCoord;\n"
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"}\n";
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vshader->compileSourceCode(vsrc);
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QGLShader *fshader = new QGLShader(QGLShader::Fragment, this);
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const char *fsrc =
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"uniform sampler2D texture;\n"
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"varying mediump vec4 texc;\n"
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"void main(void)\n"
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"{\n"
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" gl_FragColor = texture2D(texture, texc.st);\n"
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"}\n";
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fshader->compileSourceCode(fsrc);
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program = new QGLShaderProgram(this);
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program->addShader(vshader);
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program->addShader(fshader);
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program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE);
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program->bindAttributeLocation("texCoord", PROGRAM_TEXCOORD_ATTRIBUTE);
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program->link();
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program->bind();
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program->setUniformValue("texture", 0);
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}
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void GLWidget::paintGL()
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{
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qglClearColor(clearColor);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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QMatrix4x4 m;
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m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f);
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m.translate(0.0f, 0.0f, -10.0f);
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m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
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m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
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m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f);
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program->setUniformValue("matrix", m);
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program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE);
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program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE);
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program->setAttributeArray
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(PROGRAM_VERTEX_ATTRIBUTE, vertices.constData());
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program->setAttributeArray
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(PROGRAM_TEXCOORD_ATTRIBUTE, texCoords.constData());
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for (int i = 0; i < 6; ++i) {
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glBindTexture(GL_TEXTURE_2D, textures[i]);
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glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
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}
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}
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void GLWidget::resizeGL(int width, int height)
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{
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int side = qMin(width, height);
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glViewport((width - side) / 2, (height - side) / 2, side, side);
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}
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void GLWidget::mousePressEvent(QMouseEvent *event)
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{
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lastPos = event->pos();
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}
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void GLWidget::mouseMoveEvent(QMouseEvent *event)
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{
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int dx = event->x() - lastPos.x();
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int dy = event->y() - lastPos.y();
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if (event->buttons() & Qt::LeftButton) {
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rotateBy(8 * dy, 8 * dx, 0);
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} else if (event->buttons() & Qt::RightButton) {
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rotateBy(8 * dy, 0, 8 * dx);
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}
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lastPos = event->pos();
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}
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void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */)
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{
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emit clicked();
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}
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void GLWidget::makeObject()
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{
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static const int coords[6][4][3] = {
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{ { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
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{ { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },
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{ { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },
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{ { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },
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{ { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },
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{ { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
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};
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for (int j=0; j < 6; ++j) {
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textures[j] = bindTexture
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(QPixmap(QString(":/images/side%1.png").arg(j + 1)), GL_TEXTURE_2D);
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}
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for (int i = 0; i < 6; ++i) {
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for (int j = 0; j < 4; ++j) {
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texCoords.append
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(QVector2D(j == 0 || j == 3, j == 0 || j == 1));
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vertices.append
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(QVector3D(0.2 * coords[i][j][0], 0.2 * coords[i][j][1],
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0.2 * coords[i][j][2]));
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}
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}
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}
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