[Bug 21515] VENDOR_WINE vs VENDOR_ATI with xf86-video-ati

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=21515





--- Comment #48 from Stefan Dösinger <stefandoesinger at gmx.at>  2010-02-10 08:20:09 ---
I suspect the problematic part of the ati_dx9 quirk is this one:

>    if(gl_info->supported[ARB_TEXTURE_NON_POWER_OF_TWO])
>    {
>        TRACE("GL_ARB_texture_non_power_of_two advertised on R500 or earlier card, removing.\n");
>        gl_info->supported[ARB_TEXTURE_NON_POWER_OF_TWO] = FALSE;
>        gl_info->supported[WINE_NORMALIZED_TEXRECT] = TRUE;
>    }
The background is that R500 and earlier cards do not support unconditional NP2
textures(GL_ARB_texture_non_power_of_two). However, both fglrx and OSX
advertise OpenGL 2.0, which mandates support for this extension. As a result,
the driver doesn't complain if they are used and falls back to software
rendering. As a result, we disable the ARB_TEXTURE_NON_POWER_OF_TWO support.

There is an equivalent extension for direct3d's *conditional* NP2 support -
GL_ARB_texture_rectangle. R500 cards support this just fine, but this extension
has a major problem: It uses non-normalized texture coordinates(range 0.0-width
and 0.0-height), which makes using them pretty awkward, since D3D's conditional
NP2 textures use normalized(range 0.0-1.0) coords.

However, both fglrx and the OSX drivers are nice enough to render the emulated
"unconditional" NP2 textures in hardware as long as all conditions that
GL_ARB_texture_rectangle exposes are met. Those textures use normalized
texcoords, so we can pass the coords to GL 1:1, and the driver can pass them to
the card 1:1 as well.

To signal the rest of the code that it can use the APIs from
ARB_texture_non_power_of_two, but has to observe the restrictions imposed by
ARB_texture_rectangle, we set a faked extension WINE_normalized_texrect.

This whole thing assumes however, that the driver emulates unconditional NP2
textures in HW if possible, rather than falling back to software or not
rendering at all. In the R300 glxinfo linked above advertises GL 1.5, and does
not advertise ARB_texture_non_power_of_two, so the WINE_normalized_texrect fake
extension should never be set.

R600+ cards(the dx10 ones) support unconditional NP2
textures(GL_ARB_texture_non_power_of_two) just fine, so no quirk is needed for
them. We can just use whatever the driver advertises.

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