Mesa (mesa_7_4_branch): mesa: use correct tex unit lod bias for TXB instruction

[Brian Paul]

Module: Mesa
Branch: mesa_7_4_branch
Commit: 0590edeea038659d18332b61c504ccf6e97fe7fc
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0590edeea038659d18332b61c504ccf6e97fe7fc

Author: Brian Paul <brianp at vmware.com>
Date:   Thu Apr  2 13:09:32 2009 -0600

mesa: use correct tex unit lod bias for TXB instruction

(cherry picked from master, commit 1ab225017ed1ea8bd9e266d10ee56ab914bb28c1)

---

 src/mesa/shader/prog_execute.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/shader/prog_execute.c b/src/mesa/shader/prog_execute.c
index a93733c..6a79cf4 100644
--- a/src/mesa/shader/prog_execute.c
+++ b/src/mesa/shader/prog_execute.c
@@ -1577,8 +1577,8 @@ _mesa_execute_program(GLcontext * ctx,
       case OPCODE_TXB:         /* GL_ARB_fragment_program only */
          /* Texel lookup with LOD bias */
          {
-            const struct gl_texture_unit *texUnit
-               = &ctx->Texture.Unit[inst->TexSrcUnit];
+            const GLuint unit = machine->Samplers[inst->TexSrcUnit];
+            const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
             GLfloat texcoord[4], color[4], lodBias;
 
             fetch_vector4(&inst->SrcReg[0], machine, texcoord);