diff options
| -rw-r--r-- | src/mesa/program/prog_execute.c | 8 |
1 files changed, 8 insertions, 0 deletions
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) { |