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Specify swap behavior preserved bit in openvg engine. 

Unlike OpenGL, the EGL_SWAP_BEHAVIOR_PRESERVED_BIT was not set for
the EGL configuration used with OpenVG. Yet the preserved swap was
enabled still, which, according to the EGL spec, should fail. To
make sure it still works with other EGL implementations, the bit
is now set in the configuration.

Reviewed-by: Jani Hautakangas
(cherry picked from commit 710aa7f8fbd72ee303c3348aa3aaf12d6984964d)
bb10
Laszlo Agocs 2011-04-27 10:05:25 +02:00 committed by Olivier Goffart
parent 02ebcdb8c7
commit dc131f1560
1 changed files with 5 additions and 4 deletions
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9
src/openvg/qwindowsurface_vgegl.cpp
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@ -269,19 +269,20 @@ static QEglContext *createContext(QPaintDevice *device)
configProps.setPixelFormat(QImage::Format_ARGB32); // XXX
configProps.setValue(EGL_ALPHA_MASK_SIZE, 1);
#ifdef EGL_VG_ALPHA_FORMAT_PRE_BIT
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT |
EGL_VG_ALPHA_FORMAT_PRE_BIT);
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT
| EGL_SWAP_BEHAVIOR_PRESERVED_BIT
| EGL_VG_ALPHA_FORMAT_PRE_BIT);
configProps.setRenderableType(QEgl::OpenVG);
if (!context->chooseConfig(configProps)) {
// Try again without the "pre" bit.
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
if (!context->chooseConfig(configProps)) {
delete context;
return 0;
}
}
#else
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
configProps.setValue(EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_SWAP_BEHAVIOR_PRESERVED_BIT);
configProps.setRenderableType(QEgl::OpenVG);
if (!context->chooseConfig(configProps)) {
delete context;