1 files changed, 7 insertions, 0 deletions
diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index bb4c5b38d4..f5053d3289 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -3922,6 +3922,13 @@ _mesa_parse_arb_fragment_program(GLcontext* ctx, GLenum target,
 
    if (program->FogOption)
       program->Base.InputsRead |= FRAG_BIT_FOGC;
+
+   /* XXX: assume that ARB fragment programs don't have access to the
+    * FrontFacing and PointCoord values stuffed into the fog
+    * coordinate in GLSL shaders.
+    */
+   if (program->Base.InputsRead & FRAG_BIT_FOGC)
+      program->UsesFogFragCoord = TRUE;
       
    if (program->Base.Instructions)
       _mesa_free(program->Base.Instructions);