From: Brian Paul <brianp@vmware.com>
Date: Wed, 15 Sep 2010 19:56:00 +0000 (-0600)
Subject: tgsi: fix incorrect usage_mask for shadow tex instructions
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=95254bbd2ddf0c6207a642604cc218ac9d711501;p=mesa.git

tgsi: fix incorrect usage_mask for shadow tex instructions

The shadow versions of the texture targets use an extra component
(Z) to express distance from light source to the fragment.
Fixes the shadowtex demo with llvmpipe.
---

diff --git a/src/gallium/auxiliary/tgsi/tgsi_util.c b/src/gallium/auxiliary/tgsi/tgsi_util.c
index 3ec54964169..08e7e89bd67 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_util.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_util.c
@@ -262,19 +262,20 @@ tgsi_util_get_inst_usage_mask(const struct tgsi_full_instruction *inst,
    case TGSI_OPCODE_TXL:
    case TGSI_OPCODE_TXP:
       if (src_idx == 0) {
+         /* Note that the SHADOW variants use the Z component too */
          switch (inst->Texture.Texture) {
          case TGSI_TEXTURE_1D:
-         case TGSI_TEXTURE_SHADOW1D:
             read_mask = TGSI_WRITEMASK_X;
             break;
-
+         case TGSI_TEXTURE_SHADOW1D:
+            read_mask = TGSI_WRITEMASK_XZ;
+            break;
          case TGSI_TEXTURE_2D:
          case TGSI_TEXTURE_RECT:
-         case TGSI_TEXTURE_SHADOW2D:
-         case TGSI_TEXTURE_SHADOWRECT:
             read_mask = TGSI_WRITEMASK_XY;
             break;
-
+         case TGSI_TEXTURE_SHADOW2D:
+         case TGSI_TEXTURE_SHADOWRECT:
          case TGSI_TEXTURE_3D:
          case TGSI_TEXTURE_CUBE:
             read_mask = TGSI_WRITEMASK_XYZ;