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Cache the current QOpenGLFramebufferObject

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This doesn't cover FBOs bound directly with glBindFramebuffer(),
but it's perfect to create a fast path for code we know uses QOGLFBO,
thus avoiding expensive glGetIntegerv() driver calls.

The use case is to use this in QSG24BitTextMaskShader::activate(), where
we need to check if the current FBO is sRGB capable.

Change-Id: I434eeeb7e6a3d16be9327315536ad7280245085d
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
This commit is contained in:
Sérgio Martins 2016-08-05 10:51:49 +01:00
parent fbc9edb5e7
commit 0681e60380
2 changed files with 11 additions and 1 deletions
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7
src/gui/kernel/qopenglcontext_p.h
View File

@ -61,6 +61,7 @@ QT_BEGIN_NAMESPACE
class QOpenGLFunctions;
class QOpenGLContext;
class QOpenGLFramebufferObject;
class QOpenGLMultiGroupSharedResource;
class Q_GUI_EXPORT QOpenGLSharedResource
@ -204,6 +205,7 @@ public:
, workaround_missingPrecisionQualifiers(false)
, active_engine(0)
, qgl_current_fbo_invalid(false)
, qgl_current_fbo(Q_NULLPTR)
, defaultFboRedirect(0)
{
requestedFormat = QSurfaceFormat::defaultFormat();
@ -242,6 +244,11 @@ public:
bool qgl_current_fbo_invalid;
// Set and unset in QOpenGLFramebufferObject::bind()/unbind().
// (Only meaningful for QOGLFBO since an FBO might be bound by other means)
// Saves us from querying the driver for the current FBO in most paths.
QOpenGLFramebufferObject *qgl_current_fbo;
QVariant nativeHandle;
GLuint defaultFboRedirect;

5
src/gui/opengl/qopenglframebufferobject.cpp
View File

@ -1068,6 +1068,7 @@ bool QOpenGLFramebufferObject::bind()
d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, d->fbo());
QOpenGLContextPrivate::get(current)->qgl_current_fbo_invalid = true;
QOpenGLContextPrivate::get(current)->qgl_current_fbo = this;
if (d->format.samples() == 0) {
// Create new textures to replace the ones stolen via takeTexture().
@ -1107,7 +1108,9 @@ bool QOpenGLFramebufferObject::release()
if (current) {
d->funcs.glBindFramebuffer(GL_FRAMEBUFFER, current->defaultFramebufferObject());
QOpenGLContextPrivate::get(current)->qgl_current_fbo_invalid = true;
QOpenGLContextPrivate *contextPrv = QOpenGLContextPrivate::get(current);
contextPrv->qgl_current_fbo_invalid = true;
contextPrv->qgl_current_fbo = Q_NULLPTR;
}
return true;