r300/compiler: fix shadow sampling with swizzled coords

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.

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c b/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
index 09cb8b2..de988b7 100644 (file)
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
@@ -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;