void SVG::renderToTexture(const QRectF& textureRect, QGLFramebufferObjectPtr targetFbo)
{
saveGLState();
// generate and set view box in logical coordinates
QRectF viewbox(svgExtents_.x() + textureRect.x() * svgExtents_.width(),
svgExtents_.y() + textureRect.y() * svgExtents_.height(),
textureRect.width() * svgExtents_.width(),
textureRect.height() * svgExtents_.height());
svgRenderer_.setViewBox(viewbox);
// Multisampled FBO for anti-aliased rendering
QGLFramebufferObjectFormat format;
format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
format.setSamples(MULTI_SAMPLE_ANTI_ALIASING_SAMPLES);
QGLFramebufferObjectPtr renderFbo( new QGLFramebufferObject( targetFbo->size(), format ));
// Render to multisampled FBO
QPainter painter(renderFbo.get());
painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
svgRenderer_.render(&painter);
painter.end();
// Copy to texture FBO
QGLFramebufferObject::blitFramebuffer(
targetFbo.get(), QRect(0, 0, renderFbo->width(), renderFbo->height()),
renderFbo.get(), QRect(0, 0, renderFbo->width(), renderFbo->height()));
glBindTexture(GL_TEXTURE_2D, targetFbo->texture());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
restoreGLState();
}
void FBORenderStrategy::createFBOs(const QSize& size)
{
if (multisampleFBO && resolveFBO && resolveFBO->size() == size)
return;
// Create a multisample FBO and an FBO to resolve into
QGLFramebufferObjectFormat fboFormat;
fboFormat.setSamples(4);
fboFormat.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
delete multisampleFBO;
multisampleFBO = new QGLFramebufferObject(size, fboFormat);
delete resolveFBO;
resolveFBO = new QGLFramebufferObject(size);
}
QPaintEngine* QGLPixmapData::paintEngine() const
{
if (!isValid())
return 0;
if (m_renderFbo)
return m_engine;
if (useFramebufferObjects()) {
extern QGLWidget* qt_gl_share_widget();
if (!QGLContext::currentContext())
qt_gl_share_widget()->makeCurrent();
QGLShareContextScope ctx(qt_gl_share_widget()->context());
QGLFramebufferObjectFormat format;
format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
format.setSamples(4);
format.setInternalTextureFormat(GLenum(m_hasAlpha ? GL_RGBA : GL_RGB));
m_renderFbo = qgl_fbo_pool()->acquire(size(), format);
if (m_renderFbo) {
if (!m_engine)
m_engine = new QGL2PaintEngineEx;
return m_engine;
}
qWarning() << "Failed to create pixmap texture buffer of size " << size() << ", falling back to raster paint engine";
}
// If the application wants to paint into the QPixmap, we first
// force it to QImage format and then paint into that.
// This is simpler than juggling multiple GL contexts.
const_cast<QGLPixmapData *>(this)->forceToImage();
if (m_hasFillColor) {
m_source.fill(PREMUL(m_fillColor.rgba()));
m_hasFillColor = false;
}
return m_source.paintEngine();
}
QPaintEngine* QGLPixmapData::paintEngine() const
{
if (!isValid())
return 0;
if (m_renderFbo)
return m_engine;
if (useFramebufferObjects()) {
extern QGLWidget* qt_gl_share_widget();
if (!QGLContext::currentContext())
const_cast<QGLContext *>(qt_gl_share_context())->makeCurrent();
QGLShareContextScope ctx(qt_gl_share_context());
QGLFramebufferObjectFormat format;
format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
format.setSamples(4);
format.setInternalTextureFormat(GLenum(m_hasAlpha ? GL_RGBA : GL_RGB));
m_renderFbo = qgl_fbo_pool()->acquire(size(), format);
if (m_renderFbo) {
if (!m_engine)
m_engine = new QGL2PaintEngineEx;
return m_engine;
}
qWarning() << "Failed to create pixmap texture buffer of size " << size() << ", falling back to raster paint engine";
}
m_dirty = true;
if (m_source.size() != size())
m_source = QImage(size(), QImage::Format_ARGB32_Premultiplied);
if (m_hasFillColor) {
m_source.fill(PREMUL(m_fillColor.rgba()));
m_hasFillColor = false;
}
return m_source.paintEngine();
}
static PyObject *meth_QGLFramebufferObjectFormat_setSamples(PyObject *sipSelf, PyObject *sipArgs)
{
PyObject *sipParseErr = NULL;
{
int a0;
QGLFramebufferObjectFormat *sipCpp;
if (sipParseArgs(&sipParseErr, sipArgs, "Bi", &sipSelf, sipType_QGLFramebufferObjectFormat, &sipCpp, &a0))
{
Py_BEGIN_ALLOW_THREADS
sipCpp->setSamples(a0);
Py_END_ALLOW_THREADS
Py_INCREF(Py_None);
return Py_None;
}
}
/* Raise an exception if the arguments couldn't be parsed. */
sipNoMethod(sipParseErr, sipName_QGLFramebufferObjectFormat, sipName_setSamples, doc_QGLFramebufferObjectFormat_setSamples);
return NULL;
}
GLWidget::GLWidget(QWidget *parent)
: QGLWidget(QGLFormat(QGL::SampleBuffers|QGL::AlphaChannel), parent)
{
setWindowTitle(tr("OpenGL framebuffer objects"));
makeCurrent();
if (QGLFramebufferObject::hasOpenGLFramebufferBlit()) {
QGLFramebufferObjectFormat format;
format.setSamples(4);
format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
render_fbo = new QGLFramebufferObject(512, 512, format);
texture_fbo = new QGLFramebufferObject(512, 512);
} else {
render_fbo = new QGLFramebufferObject(1024, 1024);
texture_fbo = render_fbo;
}
rot_x = rot_y = rot_z = 0.0f;
scale = 0.1f;
anim = new QTimeLine(750, this);
anim->setUpdateInterval(20);
connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
connect(anim, SIGNAL(finished()), SLOT(animFinished()));
svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
logo = QImage(":/res/designer.png");
logo = logo.convertToFormat(QImage::Format_ARGB32);
tile_list = glGenLists(1);
glNewList(tile_list, GL_COMPILE);
glBegin(GL_QUADS);
{
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
}
glEnd();
glEndList();
wave = new GLfloat[logo.width()*logo.height()];
memset(wave, 0, logo.width()*logo.height());
startTimer(30); // wave timer
}
void Layer::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
QtPainter *qvpainter = NULL;
#ifdef QT_OPENGL_LIB
QPainter *fboPainter;
QGLFramebufferObject *fbo = NULL;
QGLWidget *qglWidget = qobject_cast<QGLWidget *>(widget);
if (qglWidget) { // on-screen OpenGL
QGLContext *context = const_cast<QGLContext *>(qglWidget->context());
qvpainter = new OpenGLPainter(painter, context);
} else if (cacheMode() != QGraphicsItem::NoCache &&
QGLFramebufferObject::hasOpenGLFramebufferObjects()) {
// caching, try FBO
// if we have direct rendering and FBO support, make use of
// FBO, but this could still just be in software
// NOTE: In Qt 4.6, 'painter' would already target an FBO, if we
// were using the 'OpenGL2' paint engine. We have decided to stick
// with the original engine for now, as the OpenGL2 engine relies
// heavily on shaders, which is slow for our use case.
// Apparently, we must use the QGLContext associated with
// the view being painted. Thus, PlotView tracks whether it is
// inside a paintEvent, so we can get the current QGLWidget.
OverlayScene *overlayScene = qobject_cast<OverlayScene *>(scene());
if (overlayScene)
qglWidget = qobject_cast<QGLWidget *>(overlayScene->view()->viewport());
else {
QList<QGraphicsView *> views = scene()->views();
for (int i = 0; i < views.size() && !qglWidget; i++) {
PlotView *view = qobject_cast<PlotView *>(views[i]);
if (view && view->isPainting())
qglWidget = qobject_cast<QGLWidget *>(view->viewport());
}
}
if (qglWidget) {
QSize size(painter->device()->width(), painter->device()->height());
QGLContext *context = const_cast<QGLContext *>(qglWidget->context());
// GC during paint callback may have reset this
if (qglWidget->context() != QGLContext::currentContext())
qglWidget->makeCurrent();
// NOTE: need Qt 4.6 for antialiasing to work with FBOs
#if QT_VERSION >= 0x40600
if (!fboMultisamplingFailed) {
QGLFramebufferObjectFormat fboFormat;
fboFormat.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
fboFormat.setSamples(4); // 4X antialiasing should be enough?
qInstallMsgHandler(fboDebugMsgCatcher);
fbo = new QGLFramebufferObject(size, fboFormat);
qInstallMsgHandler(0);
if (fboMultisamplingFailed) {
delete fbo;
fbo = NULL;
}
}
#endif
if (!fbo)
fbo = new QGLFramebufferObject(size);
// clear the FBO
fboPainter = new QPainter(fbo);
fboPainter->setCompositionMode(QPainter::CompositionMode_Source);
fboPainter->fillRect(0, 0, size.width(), size.height(), Qt::transparent);
fboPainter->setCompositionMode(QPainter::CompositionMode_SourceOver);
qvpainter = new OpenGLPainter(fboPainter, context);
qvpainter->setTransform(painter->worldTransform());
}
}
#endif
if (!qvpainter) // fallback to Qt renderer
qvpainter = new QtPainter(painter);
// NOTE: in QT 4.6 exposedRect will just be the bounding rect, by default
paintPlot(qvpainter, option->exposedRect);
delete qvpainter;
#ifdef QT_OPENGL_LIB
if (fbo) { // silliness: download to image, only to upload to texture
painter->setWorldMatrixEnabled(false);
qglWidget->makeCurrent(); // gc during callback may have cleared this
// need to tell Qt that 'fboImage' is actually premultiplied
QImage fboImage = fbo->toImage();
const uchar *data = fboImage.bits(); // no deep copy
QImage premultImage = QImage(data,
fboImage.width(),
fboImage.height(),
QImage::Format_ARGB32_Premultiplied);
// Not sure why this can't be (0, 0)...
painter->drawImage(QPointF(1, -1), premultImage);
delete fboPainter;
delete fbo;
}
#endif
}
void MouseMagnifyingGlassInteractorComponent::generateMagnifyingGlassTexture(const Coord &magnifyingGlassCenterScr) {
bool antialiased = false;
bool canUseMultisampleFbo = OpenGlConfigManager::getInst().isExtensionSupported("GL_EXT_framebuffer_multisample");
if (QGLFramebufferObject::hasOpenGLFramebufferBlit() && canUseMultisampleFbo) {
antialiased = true;
}
int fboSize = static_cast<int>(radius * 2);
// instantiate fbo if needed
if (fbo == NULL) {
QGLFramebufferObjectFormat fboFormat;
fboFormat.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
if (antialiased) {
fboFormat.setSamples(OpenGlConfigManager::getInst().maxNumberOfSamples());
}
fbo = new QGLFramebufferObject(fboSize, fboSize, fboFormat);
if (antialiased) {
fbo2 = new QGLFramebufferObject(fboSize, fboSize);
}
if (!antialiased) {
GlTextureManager::getInst().registerExternalTexture(textureName, fbo->texture());
}
else {
GlTextureManager::getInst().registerExternalTexture(textureName, fbo2->texture());
}
}
Vector<int, 4> viewport = glWidget->getScene()->getViewport();
// get the magnifying glass bounding box in screen space
BoundingBox boundingBox;
boundingBox[0] = Coord(magnifyingGlassCenterScr.getX() - radius, magnifyingGlassCenterScr.getY() - radius);
boundingBox[1] = Coord(magnifyingGlassCenterScr.getX() + radius, magnifyingGlassCenterScr.getY() + radius);
// compute the zoom factor to apply to scene's camera to get the area under the magnifying glass displayed entirely in the viewport
float bbWidthScreen = boundingBox[1][0] - boundingBox[0][0];
float bbHeightScreen = boundingBox[1][1] - boundingBox[0][1];
float startSize = glWidget->screenToViewport(min(glWidget->width(), glWidget->height()));
float endSize = max(bbHeightScreen, bbWidthScreen);
float zoomFactor = startSize / endSize;
// backup current camera parameters
float sceneRadiusBak = camera->getSceneRadius();
float zoomFactorBak = camera->getZoomFactor();
Coord eyesBak = camera->getEyes();
Coord centerBak = camera->getCenter();
Coord upBak = camera->getUp();
Coord move = boxCenter - centerBak;
camera->setCenter(camera->getCenter() + move);
camera->setEyes(camera->getEyes() + move);
camera->setZoomFactor(magnifyPower * zoomFactor * zoomFactorBak);
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// resize the viewport to the size of fbo and render the scene into this last one
GlScene *scene = glWidget->getScene();
scene->setViewport(0, 0, fboSize, fboSize);
fbo->bind();
Color color = scene->getBackgroundColor();
glClearColor(color.getRGL(), color.getGGL(), color.getBGL(), color.getAGL());
glClear(GL_COLOR_BUFFER_BIT);
scene->draw();
fbo->release();
if (antialiased) {
QGLFramebufferObject::blitFramebuffer(fbo2, QRect(0,0,fboSize, fboSize), fbo, QRect(0,0,fboSize, fboSize));
}
// restore original camera parameters
scene->setViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
camera->setSceneRadius(sceneRadiusBak);
camera->setZoomFactor(zoomFactorBak);
camera->setEyes(eyesBak);
camera->setCenter(centerBak);
camera->setUp(upBak);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
// need to call this explicitely otherwise we have to redraw the scene
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
}
void QwtPlotGLCanvas::paintGL()
{
const bool hasFocusIndicator =
hasFocus() && focusIndicator() == CanvasFocusIndicator;
QPainter painter;
#if QT_VERSION < 0x040600
painter.begin( this );
draw( &painter );
#else
if ( testPaintAttribute( QwtPlotGLCanvas::BackingStore ) )
{
if ( d_data->fbo == NULL || d_data->fbo->size() != size() )
{
invalidateBackingStore();
const int numSamples = 16;
QGLFramebufferObjectFormat format;
format.setSamples( numSamples );
format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
QGLFramebufferObject fbo( size(), format );
QPainter fboPainter( &fbo );
draw( &fboPainter);
fboPainter.end();
d_data->fbo = new QGLFramebufferObject( size() );
QRect rect(0, 0, width(), height());
QGLFramebufferObject::blitFramebuffer(d_data->fbo, rect, &fbo, rect);
}
// drawTexture( QRectF( -1.0, 1.0, 2.0, -2.0 ), d_data->fbo->texture() );
if ( hasFocusIndicator )
painter.begin( this );
glBindTexture(GL_TEXTURE_2D, d_data->fbo->texture());
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f);
glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex2f( 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex2f( 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex2f(-1.0f, 1.0f);
glEnd();
}
else
{
painter.begin( this );
draw( &painter );
}
#endif
if ( hasFocus() && focusIndicator() == CanvasFocusIndicator )
drawFocusIndicator( &painter );
}