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Update QOpenGLFunctions docs 

Mention QOpenGLContext::functions() which is used quite commonly in Qt
itself and also some examples.

Also, make it clear that new instances do not degrade performance since
function resolving is done only once.

Change-Id: I74ac194a0b3956a70e5078dd5a1bcdd277b5cc28
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
bb10
Laszlo Agocs 2014-08-01 12:49:51 +02:00
parent e453484bca
commit 751a74c339
1 changed files with 12 additions and 0 deletions
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12
src/gui/opengl/qopenglfunctions.cpp
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@ -126,6 +126,18 @@ QT_BEGIN_NAMESPACE
glFuncs.glActiveTexture(GL_TEXTURE1);
\endcode
An alternative approach is to query the context's associated
QOpenGLFunctions instance. This is somewhat faster than the previous
approach due to avoiding the creation of a new instance, but the difference
is fairly small since the internal data structures are shared, and function
resolving happens only once for a given context, regardless of the number of
QOpenGLFunctions instances initialized for it.
\code
QOpenGLFunctions *glFuncs = QOpenGLContext::currentContext()->functions();
glFuncs->glActiveTexture(GL_TEXTURE1);
\endcode
QOpenGLFunctions provides wrappers for all OpenGL ES 2.0
functions, including the common subset of OpenGL 1.x and ES
2.0. While such functions, for example glClear() or