How do I get OSG to re-create all GL objects in response to the GL context
being recreated?
I'm trying to get my Android GLES2 app to gracefully handle switching to/from
the Activity where OSG is running, as well as to handle sleep/wake. Whenever
these happen, the EGL context is lost, and all GL objects (buffers, textures,
programs, etc.) are silently deleted.
Therefore, the usual approach is to call glGen*() when the EGL surface is
recreated. Calling glDelete* is counter-productive; the GL objects are already
gone.
I've tried using osg::discardAllGLObjects(), thinking that this will force OSG
to regenerate the GL objects during the next frame(). It appears to correctly
discard the VBOs and texture objects, but it does not discard shaders or
programs.
Code:
void osg::discardAllGLObjects(unsigned int contextID)
{
#ifdef OSG_GL_DISPLAYLISTS_AVAILABLE
osg::Drawable::discardAllDeletedDisplayLists(contextID);
#endif
#ifdef OSG_GL_FIXED_FUNCTION_AVAILABLE
osg::FragmentProgram::discardDeletedFragmentProgramObjects(contextID);
osg::VertexProgram::discardDeletedVertexProgramObjects(contextID);
#endif
osg::GLBufferObject::discardAllBufferObjects(contextID);
osg::Texture::discardAllTextureObjects(contextID);[/b]
osg::FrameBufferObject::discardDeletedFrameBufferObjects(contextID);
osg::Program::discardDeletedGlPrograms(contextID);
osg::RenderBuffer::discardDeletedRenderBuffers(contextID);
osg::Shader::discardDeletedGlShaders(contextID);
osg::OcclusionQueryNode::discardDeletedQueryObjects(contextID);
}
As you can see, this function will discard shaders and programs which have
already been deleted, but as far as OSG knows, none of them have been deleted.
The textures and buffers each have centralized managers, but the shaders and
programs do not.
How should I approach this problem? Is there a straightforward way to fix
osg::discardAllGLObjects() so that it will discard all GL shader objects? Do I
need to track all of my osg::Shader instances myself so I can call
Shader::releaseGLObjects() and Shader::dirtyShader()?
Thanks,
James
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=49231#49231
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