I'm curious about what the proper behavior should be for extensions that
have been integrated into core. In particular I'm looking at
ARB_texture_cube_map as we are using that in one of the ARB_texture_view
piglit tests and when run on the Mesa driver the piglit
function piglit_require_extension("GL_ARB_texture_cube_map") fails.Running with MESA_INFO on I see: Mesa: Mesa GL_VERSION = 3.1 (Core Profile) Mesa 9.3.0-devel (git-0398dd3) Mesa: Mesa GL_RENDERER = Mesa DRI Intel(R) Ivybridge Server Mesa: Mesa GL_VENDOR = Intel Open Source Technology Center Mesa: Mesa GL_EXTENSIONS does not contain ARB_texture_cube_map When we run the same test on the NVIDIA closed source driver the test does find an ARB_texture_cube_map extension. It also is given a compatibility context and not a Core Profile context. The spec says that deprecated features may not be available in newer Core Profiles. ARB_texture_cube_map has not been deprecated, it's been promoted into core. According to the OpenGL Spec: H.3.2 Promoting Extensions to Core Features Extensions can be promoted to required core features in later revisions of OpenGL. When this occurs, the extension specifications are merged into the core specifica- tion. Functions and enumerants that are part of such promoted extensions will have the ARB, KHR, EXT, or vendor affix removed. I*mplementations of such later revisions should continue to export the name* *strings of promoted extensions in the EXTENSIONS strings and continue to support* *the affixed versions of functions and enumerants as a transition aid.* For descriptions of extensions promoted to core features in OpenGL 1.3 and beyond, see the corresponding version of the OpenGL specification, or the de- scriptions of that version in version-specific appendices to later versions of the specification. This says to me that the Mesa driver should be listing GL_ARB_texture_cube_map in it's extension string. So, why isn't it there? What am I missing? What should the piglit test do? Is this going to be a compatibility issue for applications? Thanks, Courtney -- Courtney Goeltzenleuchter LunarG
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