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authorSven Gothel <[email protected]>2012-10-28 22:56:21 +0100
committerSven Gothel <[email protected]>2012-10-28 22:56:21 +0100
commit9b6448b1d54716fd455c0cad0c6133c0edeb3bb8 (patch)
treebd163d415d35f865e7f717dabe334a195caf067f /doxygen
parent17d47c83bb976b6185b1562a2c332ecfef258c48 (diff)
GLRendererQuirks: Add RequiresBoundVAO (w/ impl.), GLSLBuggyDiscard (todo) ; GLContextImpl: Bind default VAO if having quirk RequiresBoundVAO.
OSX w/ OpenGL >= 3 core context implementation requires a bound VAO for vertex attribute operations, i.e. VertexAttributePointer(..). This has been experienced on OSX 10.7.5, OpenGL 3.2 core w/ Nvidia GPU and in several forum posts. Such 'behavior' violates the GL 3.2 core specification, which does not state this requirement, hence it is a bug. (Please correct me if I am wrong!) GLContextImpl works around this quirk, by generating a default VAO and binds it at 1st makeCurrent (@creation) and deletes it at destroy. This is minimal invasive since no action is required for subsequent makeCurrent or release. We assume if a user uses and binds a VAO herself, she will mind this quirk. Note: We could enhance this workaround by quering for a currently bound VAO at makeCurrent() and bind our default if none. However, we refrain from this operation to minimize the workaround and complexity.
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