AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

QOpenGLWidget: invalidate the depth/stencil after rendering

Browse Source 
We don't need them any more, only the color is used for compositing.
In principle this enables a driver to not writeback their contents into
main memory.

Change-Id: Ibde17af6c14c98ebdca956aaf902dfd728f9219c
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Giuseppe D'Angelo 2023-07-22 00:47:28 +02:00
parent 76e650045e
commit 21d3bb9e74
1 changed files with 39 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
src/openglwidgets/qopenglwidget.cpp
View File

@ -553,7 +553,13 @@ public:
void initialize();
void render();
void invalidateFbo();
static constexpr GLenum gl_color_attachment0 = 0x8CE0; // GL_COLOR_ATTACHMENT0
static constexpr GLenum gl_depth_attachment = 0x8D00; // GL_DEPTH_ATTACHMENT
static constexpr GLenum gl_stencil_attachment = 0x8D20; // GL_STENCIL_ATTACHMENT
static constexpr GLenum gl_depth_stencil_attachment = 0x821A; // GL_DEPTH_STENCIL_ATTACHMENT
void invalidateFboBeforePainting();
void invalidateFboAfterPainting();
void destroyFbos();
@ -946,11 +952,11 @@ void QOpenGLWidgetPrivate::render()
}
if (updateBehavior == QOpenGLWidget::NoPartialUpdate && hasBeenComposed) {
invalidateFbo();
invalidateFboBeforePainting();
if (stereo && fbos[QOpenGLWidget::RightBuffer]) {
setCurrentTargetBuffer(QOpenGLWidget::RightBuffer);
invalidateFbo();
invalidateFboBeforePainting();
setCurrentTargetBuffer(QOpenGLWidget::LeftBuffer);
}
@ -967,11 +973,15 @@ void QOpenGLWidgetPrivate::render()
QOpenGLContextPrivate::get(ctx)->defaultFboRedirect = fbos[currentTargetBuffer]->handle();
q->paintGL();
if (updateBehavior == QOpenGLWidget::NoPartialUpdate)
invalidateFboAfterPainting();
if (stereo && fbos[QOpenGLWidget::RightBuffer]) {
setCurrentTargetBuffer(QOpenGLWidget::RightBuffer);
QOpenGLContextPrivate::get(ctx)->defaultFboRedirect = fbos[currentTargetBuffer]->handle();
q->paintGL();
if (updateBehavior == QOpenGLWidget::NoPartialUpdate)
invalidateFboAfterPainting();
}
QOpenGLContextPrivate::get(ctx)->defaultFboRedirect = 0;
@ -979,32 +989,43 @@ void QOpenGLWidgetPrivate::render()
flushPending = true;
}
void QOpenGLWidgetPrivate::invalidateFbo()
void QOpenGLWidgetPrivate::invalidateFboBeforePainting()
{
QOpenGLExtensions *f = static_cast<QOpenGLExtensions *>(QOpenGLContext::currentContext()->functions());
if (f->hasOpenGLExtension(QOpenGLExtensions::DiscardFramebuffer)) {
const int gl_color_attachment0 = 0x8CE0; // GL_COLOR_ATTACHMENT0
const int gl_depth_attachment = 0x8D00; // GL_DEPTH_ATTACHMENT
const int gl_stencil_attachment = 0x8D20; // GL_STENCIL_ATTACHMENT
const GLenum attachments[] = {
gl_color_attachment0,
gl_depth_attachment,
gl_stencil_attachment,
#ifdef Q_OS_WASM
// webgl does not allow separate depth and stencil attachments
// QTBUG-69913
const int gl_depth_stencil_attachment = 0x821A; // GL_DEPTH_STENCIL_ATTACHMENT
const GLenum attachments[] = {
gl_color_attachment0, gl_depth_attachment, gl_stencil_attachment, gl_depth_stencil_attachment
};
#else
const GLenum attachments[] = {
gl_color_attachment0, gl_depth_attachment, gl_stencil_attachment
};
// webgl does not allow separate depth and stencil attachments
// QTBUG-69913
gl_depth_stencil_attachment
#endif
};
f->discardFramebuffer(GL_FRAMEBUFFER, GLsizei(std::size(attachments)), attachments);
} else {
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
}
}
void QOpenGLWidgetPrivate::invalidateFboAfterPainting()
{
QOpenGLExtensions *f = static_cast<QOpenGLExtensions *>(QOpenGLContext::currentContext()->functions());
if (f->hasOpenGLExtension(QOpenGLExtensions::DiscardFramebuffer)) {
const GLenum attachments[] = {
gl_depth_attachment,
gl_stencil_attachment,
#ifdef Q_OS_WASM
// webgl does not allow separate depth and stencil attachments
// QTBUG-69913
gl_depth_stencil_attachment
#endif
};
f->discardFramebuffer(GL_FRAMEBUFFER, GLsizei(std::size(attachments)), attachments);
}
}
void QOpenGLWidgetPrivate::destroyFbos()
{
delete fbos[QOpenGLWidget::LeftBuffer];