From: Brian Paul <brianp@vmware.com>
Date: Thu, 18 Aug 2011 21:54:53 +0000 (-0600)
Subject: mesa: set Q=1 for OPCODE_TEX execution
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0eb18ee55719377ebd90456bde605384ce4ec14a;p=mesa.git

mesa: set Q=1 for OPCODE_TEX execution

Q should not be significant for OPCODE_TEX, but it winds up getting
passed to the compute_lambda() function.  Make sure it's 1.0 to
prevent garbage values, which is effectively what we get when the
swizzle is coord.xyzz (which is what GLSL gives us).

Part of the fix for piglit's fbo-generatemipmap-array test.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---

diff --git a/src/mesa/program/prog_execute.c b/src/mesa/program/prog_execute.c
index c70a1e344e5..77f842a1630 100644
--- a/src/mesa/program/prog_execute.c
+++ b/src/mesa/program/prog_execute.c
@@ -1651,6 +1651,14 @@ _mesa_execute_program(struct gl_context * ctx,
             GLfloat texcoord[4], color[4];
             fetch_vector4(&inst->SrcReg[0], machine, texcoord);
 
+            /* For TEX, texcoord.Q should not be used and its value should not
+             * matter (at most, we pass coord.xyz to texture3D() in GLSL).
+             * Set Q=1 so that FetchTexelDeriv() doesn't get a garbage value
+             * which is effectively what happens when the texcoord swizzle
+             * is .xyzz
+             */
+            texcoord[3] = 1.0f;
+
             fetch_texel(ctx, machine, inst, texcoord, 0.0, color);
 
             if (DEBUG_PROG) {