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authorBrian Paul <brianp@vmware.com>2009-07-29 16:27:03 -0600
committerBrian Paul <brianp@vmware.com>2009-07-29 16:33:58 -0600
commitb9889517f5e7eceb14bd103bbdff9ff47ce6ed25 (patch)
tree3ce1520391909f877eefa91c9b1b464fac5d2b37 /src/gallium/auxiliary/tgsi/tgsi_sse2.c
parent9c4c9f2837e08c5f69bc0d12bce7a656b2291837 (diff)
gallium: fix SSE shadow texture instructions
When sampling a 2D shadow map we need 3 texcoord components, not 2. The third component (distance from light source) is compared against the texture sample to return the result (visible vs. occluded). Also, enable proper handling of TGSI_TEXTURE_SHADOW targets in Mesa->TGSI translation. There's a possibility for breakage in gallium drivers if they fail to handle the TGSI_TEXTURE_SHADOW1D / TGSI_TEXTURE_SHADOW2D / TGSI_TEXTURE_SHADOWRECT texture targets for TGSI_OPCODE_TEX/TXP instructions, but that should be easy to fix. With these changes, progs/demos/shadowtex.c renders properly again with softpipe.
Diffstat (limited to 'src/gallium/auxiliary/tgsi/tgsi_sse2.c')
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_sse2.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_sse2.c b/src/gallium/auxiliary/tgsi/tgsi_sse2.c
index 781ea1e75c..16848f7cc5 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_sse2.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_sse2.c
@@ -1467,15 +1467,15 @@ emit_tex( struct x86_function *func,
switch (inst->InstructionExtTexture.Texture) {
case TGSI_TEXTURE_1D:
- case TGSI_TEXTURE_SHADOW1D:
count = 1;
break;
case TGSI_TEXTURE_2D:
case TGSI_TEXTURE_RECT:
- case TGSI_TEXTURE_SHADOW2D:
- case TGSI_TEXTURE_SHADOWRECT:
count = 2;
break;
+ case TGSI_TEXTURE_SHADOW1D:
+ case TGSI_TEXTURE_SHADOW2D:
+ case TGSI_TEXTURE_SHADOWRECT:
case TGSI_TEXTURE_3D:
case TGSI_TEXTURE_CUBE:
count = 3;