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svga: Add a comment about depth format selection.

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José Fonseca 2011-04-08 15:21:10 +01:00 • committed by Brian Paul
parent 846a21d352
commit 6759ad53e2
1 changed files with 10 additions and 1 deletions
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11
src/gallium/drivers/svga/svga_screen.c
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@ -519,6 +519,15 @@ svga_screen_create(struct svga_winsys_screen *sws)
sws->get_cap(sws, SVGA3D_DEVCAP_VERTEX_SHADER_VERSION, &result) &&
result.u >= SVGA3DVSVERSION_30 ? TRUE : FALSE;
/*
* The D16, D24X8, and D24S8 formats always do an implicit shadow compare
* when sampled from, where as the DF16, DF24, and D24S8_INT do not. So
* we prefer the later when available.
*
* This mimics hardware vendors extensions for D3D depth sampling. See also
* http://aras-p.info/texts/D3D9GPUHacks.html
*/
{
SVGA3dSurfaceFormatCaps mask;
mask.value = 0;
@ -551,7 +560,7 @@ svga_screen_create(struct svga_winsys_screen *sws)
sws->get_cap(sws, SVGA3D_DEVCAP_SURFACEFMT_Z_D24S8_INT, &result) &&
(result.u & mask.value) == mask.value ?
SVGA3D_Z_D24S8_INT : svgascreen->depth.s8z24;
}
}
#if 1