FGFS-4.1/OpenSceneGraph
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Added TestSupportCallback to properly handle querry of OpenGL support of

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vertex texturing in GLSL.
This commit is contained in:
Robert Osfield 2005-12-01 14:09:38 +00:00
parent b324156ec8
commit 1c9f1b8eb1
1 changed files with 40 additions and 22 deletions
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62
examples/osgshaderterrain/osgshaderterrain.cpp
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@ -729,6 +729,39 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int /*numTreesToCreates*
return scene;
}
class TestSupportCallback : public osgProducer::OsgCameraGroup::RealizeCallback
{
public:
TestSupportCallback():_supported(true),_errorMessage() {}
virtual void operator()( osgProducer::OsgCameraGroup&, osgProducer::OsgSceneHandler& sh, const Producer::RenderSurface& )
{
unsigned int contextID = sh.getSceneView()->getState()->getContextID();
osg::GL2Extensions* gl2ext = osg::GL2Extensions::Get(contextID,true);
if( gl2ext )
{
if( !gl2ext->isGlslSupported() )
{
_supported = false;
_errorMessage = "ERROR: GLSL not supported by OpenGL driver.";
}
GLint numVertexTexUnits = 0;
glGetIntegerv( GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &numVertexTexUnits );
if( numVertexTexUnits <= 0 )
{
_supported = false;
_errorMessage = "ERROR: vertex texturing not supported by OpenGL driver.";
}
}
}
bool _supported;
std::string _errorMessage;
};
int main( int argc, char **argv )
{
@ -777,31 +810,16 @@ int main( int argc, char **argv )
// add model to viewer.
viewer.setSceneData( node );
osg::ref_ptr<TestSupportCallback> testSupportCallback = new TestSupportCallback();
viewer.setRealizeCallback(testSupportCallback.get());
// create the windows and run the threads.
viewer.realize();
// not all hardware can support vertex texturing, so check first.
for(unsigned int contextID = 0;
contextID<viewer.getDisplaySettings()->getMaxNumberOfGraphicsContexts();
++contextID)
if (!testSupportCallback->_supported)
{
osg::GL2Extensions* gl2ext = osg::GL2Extensions::Get(contextID,false);
if( gl2ext )
{
if( !gl2ext->isGlslSupported() )
{
std::cout<<"ERROR: GLSL not supported by OpenGL driver."<<std::endl;
return 1;
}
GLint numVertexTexUnits = 0;
glGetIntegerv( GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &numVertexTexUnits );
if( numVertexTexUnits <= 0 )
{
std::cout<<"ERROR: vertex texturing not supported by OpenGL driver."<<std::endl;
return 1;
}
}
osg::notify(osg::WARN)<<testSupportCallback->_errorMessage<<std::endl;
exit(1);
}
while( !viewer.done() )