----- Original Message ----- > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 09/19/2011 07:20 AM, Brian Paul wrote: > > On 09/19/2011 04:25 AM, Yuanhan Liu wrote: > >> If I understand correctly, the new GL3 buffer object queries > >> parameters, like BUFFER_MAP_ACCESS_FLAGS, depends on > >> ARB_map_buffer_range extension. > > > > That would make sense, but in fact the extension spec > > (http://www.opengl.org/registry/specs/ARB/map_buffer_range.txt) > > says nothing about these queries. They were added in GL 3.0. > > It seems like this could be an error in the extension spec. This is > one of the extensions, like ARB_framebuffer_object, that "back ports" > OpenGL 3.0 functionality to previous versions. These extensions are > supposed to provide *identical* functionality to OpenGL 3.0. The > other cases of mismatches have been determined to be bugs in the > extension specs.
FWIW, this ability would be useful for GL debuggers such as apitrace. Otherwise the ARB_map_buffer_range extension is unbalanced: it adds new state that can never be queried. > The question is, what do other implementations do? The other other > question is, are there any implementations that support > ARB_map_buffer_range but not OpenGL 3.0? Very good questions... The answer to the later question can be obtained by data mining openbenchmarking.org, by entering this query on google: site:openbenchmarking.org GL_ARB_map_buffer_range glxinfo "OpenGL version string: 2.1" -mesa and there are a few NVIDIA cards / driver combinations out there that hit this: OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce 7900 GT/GTO/PCI/SSE2 OpenGL version string: 2.1.2 NVIDIA 260.19.36 OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: Quadro FX 3450/4000 SDI/PCI/SSE2 OpenGL version string: 2.1.2 NVIDIA 195.36.31 OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce Go 7400/PCI/SSE2 OpenGL version string: 2.1.2 NVIDIA 270.29 OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce Go 7900 GS/PCI/SSE2 OpenGL version string: 2.1.2 NVIDIA 260.19.06 OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce 7600 GT/PCI/SSE2 OpenGL version string: 2.1.2 NVIDIA 270.30 If anybody had one of these, we could tell for sure. Jose _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
