summaryrefslogtreecommitdiffstats
path: root/src/gui/opengl/qopenglfunctions.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/gui/opengl/qopenglfunctions.cpp')
-rw-r--r--src/gui/opengl/qopenglfunctions.cpp63
1 files changed, 5 insertions, 58 deletions
diff --git a/src/gui/opengl/qopenglfunctions.cpp b/src/gui/opengl/qopenglfunctions.cpp
index 4f48604a88..b4ff21f3fd 100644
--- a/src/gui/opengl/qopenglfunctions.cpp
+++ b/src/gui/opengl/qopenglfunctions.cpp
@@ -90,65 +90,18 @@ void CLASS::init(QOpenGLContext *context) \
that need it. The recommended way to use QOpenGLFunctions is by
direct inheritance:
- \code
- class MyGLWindow : public QWindow, protected QOpenGLFunctions
- {
- Q_OBJECT
- public:
- MyGLWindow(QScreen *screen = 0);
-
- protected:
- void initializeGL();
- void paintGL();
-
- QOpenGLContext *m_context;
- };
-
- MyGLWindow(QScreen *screen)
- : QWindow(screen), QOpenGLWidget(parent)
- {
- setSurfaceType(OpenGLSurface);
- create();
-
- // Create an OpenGL context
- m_context = new QOpenGLContext;
- m_context->create();
-
- // Setup scene and render it
- initializeGL();
- paintGL();
- }
-
- void MyGLWindow::initializeGL()
- {
- m_context->makeCurrent(this);
- initializeOpenGLFunctions();
- }
- \endcode
+ \snippet code/src_gui_opengl_qopenglfunctions.cpp 0
The \c{paintGL()} function can then use any of the OpenGL ES 2.0
functions without explicit resolution, such as glActiveTexture()
in the following example:
- \code
- void MyGLWindow::paintGL()
- {
- m_context->makeCurrent(this);
- glActiveTexture(GL_TEXTURE1);
- glBindTexture(GL_TEXTURE_2D, textureId);
- ...
- m_context->swapBuffers(this);
- m_context->doneCurrent();
- }
- \endcode
+ \snippet code/src_gui_opengl_qopenglfunctions.cpp 1
QOpenGLFunctions can also be used directly for ad-hoc invocation
of OpenGL ES 2.0 functions on all platforms:
- \code
- QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
- glFuncs.glActiveTexture(GL_TEXTURE1);
- \endcode
+ \snippet code/src_gui_opengl_qopenglfunctions.cpp 2
An alternative approach is to query the context's associated
QOpenGLFunctions instance. This is somewhat faster than the previous
@@ -157,10 +110,7 @@ void CLASS::init(QOpenGLContext *context) \
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
+ \snippet code/src_gui_opengl_qopenglfunctions.cpp 3
QOpenGLFunctions provides wrappers for all OpenGL ES 2.0
functions, including the common subset of OpenGL 1.x and ES
@@ -175,10 +125,7 @@ void CLASS::init(QOpenGLContext *context) \
feature. For example, the following checks if non power of two
textures are available:
- \code
- QOpenGLFunctions funcs(QOpenGLContext::currentContext());
- bool npot = funcs.hasOpenGLFeature(QOpenGLFunctions::NPOTTextures);
- \endcode
+ \snippet code/src_gui_opengl_qopenglfunctions.cpp 4
\sa QOpenGLContext, QSurfaceFormat
*/