af1dbfd223
glViewport expects device pixels, but the various geometry accessors returns values in device-independent pixels. Change-Id: I8004692de82251e4f1f25bf8f2698895f222ede3 Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
247 lines
7.1 KiB
C++
247 lines
7.1 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** You may use this file under the terms of the BSD license as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
|
|
** of its contributors may be used to endorse or promote products derived
|
|
** from this software without specific prior written permission.
|
|
**
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include "glwidget.h"
|
|
#include <math.h>
|
|
|
|
#include "cube.h"
|
|
|
|
#include <QGLPixelBuffer>
|
|
|
|
#ifndef GL_MULTISAMPLE
|
|
#define GL_MULTISAMPLE 0x809D
|
|
#endif
|
|
|
|
static GLfloat colorArray[][4] = {
|
|
{0.243f, 0.423f, 0.125f, 1.0f},
|
|
{0.176f, 0.31f, 0.09f, 1.0f},
|
|
{0.4f, 0.69f, 0.212f, 1.0f},
|
|
{0.317f, 0.553f, 0.161f, 1.0f}
|
|
};
|
|
|
|
GLWidget::GLWidget(QWidget *parent)
|
|
: QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
|
|
, geom(0)
|
|
, cube(0)
|
|
{
|
|
// create the pbuffer
|
|
QGLFormat pbufferFormat = format();
|
|
pbufferFormat.setSampleBuffers(false);
|
|
pbuffer = new QGLPixelBuffer(QSize(512, 512), pbufferFormat, this);
|
|
setWindowTitle(tr("OpenGL pbuffers"));
|
|
initializeGeometry();
|
|
}
|
|
|
|
GLWidget::~GLWidget()
|
|
{
|
|
pbuffer->releaseFromDynamicTexture();
|
|
glDeleteTextures(1, &dynamicTexture);
|
|
delete pbuffer;
|
|
|
|
qDeleteAll(cubes);
|
|
qDeleteAll(tiles);
|
|
delete cube;
|
|
}
|
|
|
|
void GLWidget::initializeGL()
|
|
{
|
|
initCommon();
|
|
glShadeModel(GL_SMOOTH);
|
|
glEnable(GL_LIGHTING);
|
|
glEnable(GL_LIGHT0);
|
|
static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
|
|
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
|
|
initPbuffer();
|
|
cube->startAnimation();
|
|
connect(cube, SIGNAL(changed()), this, SLOT(update()));
|
|
for (int i = 0; i < 3; ++i)
|
|
{
|
|
cubes[i]->startAnimation();
|
|
connect(cubes[i], SIGNAL(changed()), this, SLOT(update()));
|
|
}
|
|
}
|
|
|
|
void GLWidget::paintGL()
|
|
{
|
|
pbuffer->makeCurrent();
|
|
drawPbuffer();
|
|
// On direct render platforms, drawing onto the pbuffer context above
|
|
// automatically updates the dynamic texture. For cases where rendering
|
|
// directly to a texture is not supported, explicitly copy.
|
|
if (!hasDynamicTextureUpdate)
|
|
pbuffer->updateDynamicTexture(dynamicTexture);
|
|
makeCurrent();
|
|
|
|
// Use the pbuffer as a texture to render the scene
|
|
glBindTexture(GL_TEXTURE_2D, dynamicTexture);
|
|
|
|
// set up to render the scene
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
glLoadIdentity();
|
|
glTranslatef(0.0f, 0.0f, -10.0f);
|
|
|
|
// draw the background
|
|
glPushMatrix();
|
|
glScalef(aspect, 1.0f, 1.0f);
|
|
for (int i = 0; i < tiles.count(); ++i)
|
|
tiles[i]->draw();
|
|
glPopMatrix();
|
|
|
|
// draw the bouncing cubes
|
|
for (int i = 0; i < cubes.count(); ++i)
|
|
cubes[i]->draw();
|
|
}
|
|
|
|
void GLWidget::initializeGeometry()
|
|
{
|
|
geom = new Geometry();
|
|
CubeBuilder cBuilder(geom, 0.5);
|
|
cBuilder.setColor(QColor(255, 255, 255, 212));
|
|
// build the 3 bouncing, spinning cubes
|
|
for (int i = 3; i > 0; --i)
|
|
cubes.append(cBuilder.newCube(QVector3D((float)(i-1), -1.5f, 5 - i)));
|
|
|
|
// build the spinning cube which goes in the dynamic texture
|
|
cube = cBuilder.newCube();
|
|
cube->removeBounce();
|
|
|
|
// build the background tiles
|
|
TileBuilder tBuilder(geom);
|
|
tBuilder.setColor(QColor(Qt::white));
|
|
for (int c = -2; c <= +2; ++c)
|
|
for (int r = -2; r <= +2; ++r)
|
|
tiles.append(tBuilder.newTile(QVector3D(c, r, 0)));
|
|
|
|
// graded backdrop for the pbuffer scene
|
|
TileBuilder bBuilder(geom, 0.0f, 2.0f);
|
|
bBuilder.setColor(QColor(102, 176, 54, 210));
|
|
backdrop = bBuilder.newTile(QVector3D(0.0f, 0.0f, -1.5f));
|
|
backdrop->setColors(colorArray);
|
|
}
|
|
|
|
void GLWidget::initCommon()
|
|
{
|
|
qglClearColor(QColor(Qt::darkGray));
|
|
|
|
glEnable(GL_DEPTH_TEST);
|
|
glEnable(GL_CULL_FACE);
|
|
glEnable(GL_MULTISAMPLE);
|
|
|
|
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
|
glEnable(GL_BLEND);
|
|
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
geom->loadArrays();
|
|
}
|
|
|
|
void GLWidget::perspectiveProjection()
|
|
{
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
#ifdef QT_OPENGL_ES
|
|
glFrustumf(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
|
|
#else
|
|
glFrustum(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
|
|
#endif
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
void GLWidget::orthographicProjection()
|
|
{
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
#ifdef QT_OPENGL_ES
|
|
glOrthof(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
|
|
#else
|
|
glOrtho(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
|
|
#endif
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
void GLWidget::resizeGL(int width, int height)
|
|
{
|
|
glViewport(0, 0, width * devicePixelRatio(), height * devicePixelRatio());
|
|
aspect = (qreal)width / (qreal)(height ? height : 1);
|
|
perspectiveProjection();
|
|
}
|
|
|
|
void GLWidget::drawPbuffer()
|
|
{
|
|
orthographicProjection();
|
|
|
|
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
glDisable(GL_TEXTURE_2D);
|
|
backdrop->draw();
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
glBindTexture(GL_TEXTURE_2D, cubeTexture);
|
|
glDisable(GL_CULL_FACE);
|
|
cube->draw();
|
|
glEnable(GL_CULL_FACE);
|
|
|
|
glFlush();
|
|
}
|
|
|
|
void GLWidget::initPbuffer()
|
|
{
|
|
pbuffer->makeCurrent();
|
|
|
|
cubeTexture = bindTexture(QImage(":res/cubelogo.png"));
|
|
|
|
initCommon();
|
|
|
|
// generate a texture that has the same size/format as the pbuffer
|
|
dynamicTexture = pbuffer->generateDynamicTexture();
|
|
|
|
// bind the dynamic texture to the pbuffer - this is a no-op under X11
|
|
hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
|
|
makeCurrent();
|
|
}
|
|
|
|
void GLWidget::setAnimationPaused(bool enable)
|
|
{
|
|
cube->setAnimationPaused(enable);
|
|
for (int i = 0; i < 3; ++i)
|
|
cubes[i]->setAnimationPaused(enable);
|
|
}
|