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r300/compiler: fix shadow sampling with swizzled coords

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Taking the W component from coords directly ignores swizzling. Instead,
take the component which is mapped to W in the TEX instruction parameter.
The same for Z.

NOTE: This is a candidate for the 7.9 branch.
This commit is contained in:
Marek Olšák
2010-09-28 03:58:23 +02:00
parent c2ea7ffb0a
commit 7128e1625b
1 changed files with 5 additions and 4 deletions
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src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
+5 -4
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@@ -175,17 +175,18 @@ int radeonTransformTEX(
inst_rcp->U.I.DstReg.Index = tmp_recip_w;
inst_rcp->U.I.DstReg.WriteMask = RC_MASK_W;
inst_rcp->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
/* XXX do not take W, instead, see which channel is mapped to W. */
inst_rcp->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
inst_rcp->U.I.SrcReg[0].Swizzle =
RC_MAKE_SWIZZLE_SMEAR(GET_SWZ(inst->U.I.SrcReg[0].Swizzle, 3));
}
/* Perspective-divide r by W (if it's TXP) and add the texture sample (see below). */
/* Perspective-divide Z by W (if it's TXP) and add the texture sample (see below). */
tmp_sum = rc_find_free_temporary(c);
inst_mad = rc_insert_new_instruction(c, inst_rcp ? inst_rcp : inst);
inst_mad->U.I.DstReg.File = RC_FILE_TEMPORARY;
inst_mad->U.I.DstReg.Index = tmp_sum;
inst_mad->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
inst_mad->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_ZZZZ;
inst_mad->U.I.SrcReg[0].Swizzle =
RC_MAKE_SWIZZLE_SMEAR(GET_SWZ(inst->U.I.SrcReg[0].Swizzle, 2));
if (inst->U.I.Opcode == RC_OPCODE_TXP) {
inst_mad->U.I.Opcode = RC_OPCODE_MAD;
inst_mad->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;