Ian Romanick wrote:
Log message: Fixed the various supported texture wrap modes. Added a fallback for unsupportable combinations of S/T wrap modes.
All of the exported modes on Radeon, R200, and MGA should be correct now. I'm going to try and look at i830 this week. Could somebody please see about fixing up Rage128 and 3dfx? I see that both of those have some of the same problems that the "fixed" drivers used to have.
Has anyone had a chance to look at this on either Rage128 or 3dfx? I did a little snooping in both drivers, and I have a couple theories, but someone with the actual hardware will have to verify them.
I think the Rage128 driver is wrong in a couple of ways. It uses the same mode for GL_CLAMP and GL_CLAMP_TO_BORDER. If the hardware, like the Intel hardware, can't support GL_CLAMP, then it should use GL_CLAMP_TO_EDGE. This is consistent with the Intel driver. I think it's also closer to what people are likely to expect.
I looked at Delph3D, and the Rage128 drivers for the other operating system don't support ARB_texture_mirrored_repeat. They do, however, support ATI_texure_mirror_once. Changing 'b' in texwrap.c to 1.2 (from 0.2) will show which the driver is actually doing.
http://delphi3d.net/hardware/viewreport.php?report=294
The Rage128 driver also doesn't export the SGI versions of any of the clamp extensions. This is trivial and not necessary, but is probably a good idea.
The 3dfx driver also has a number of problems. The switch-statement that handles texture wrap modes doesn't have a case for GL_CLAMP_TO_EDGE, which is a required part of GL 1.2. The bad part is that because GL_CLAMP_TO_EDGE comes after GL_CLAMP in the test, it will probably look okay in the test. Moreover, I don't see a mode for it (or GL_CLAMP_TO_BORDER) in tdfx_glide.h. I'm not sure what we should do about that. At the very least we should make GL_CLAMP_TO_EDGE work like GL_CLAMP. Leaving the currently set mode as-is is just plain wrong.
tdfx_glide.h has a mirror mode (GR_TEXTURECLAMP_MIRROR_EXT, line 308), so the hardware probably supports ARB / IBM_texture_mirrored_repeat. That should be investigated.
The driver also doesn't export any of the extension strings. I assme that is because it doesn't actually support any of the extensions (even the required one).
The Banshee driver (from 07-Jan-2000), Voodoo3 driver (from 16-Jan-2001), and the Voodoo5 driver (from 21-Nov-2000) for that other operating system all export SGIS_texture_edge_clamp, but that's all. Either 3dfx implements GL_CLAMP as GL_CLAMP_TO_EDGE (like Intel), or there some missing bits in tdfx_glide.h.
http://delphi3d.net/hardware/viewreport.php?report=19 http://delphi3d.net/hardware/viewreport.php?report=17 http://delphi3d.net/hardware/viewreport.php?report=204
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