From c0ef16647424452ba60e165c82c59f5ff64f12d4 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 25 Mar 2008 11:32:31 -0600
Subject: [PATCH] mesa: append fog instructions after parsing if a fog option
 is set

Drivers don't have to worry about it then.
---
 src/mesa/shader/arbprogparse.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index 6782491cc50..6648ed7b719 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -35,6 +35,7 @@
 #include "shader/grammar/grammar_mesa.h"
 #include "arbprogparse.h"
 #include "program.h"
+#include "programopt.h"
 #include "prog_parameter.h"
 #include "prog_statevars.h"
 #include "context.h"
@@ -3929,6 +3930,16 @@ _mesa_parse_arb_fragment_program(GLcontext* ctx, GLenum target,
       _mesa_free_parameter_list(program->Base.Parameters);
    program->Base.Parameters    = ap.Base.Parameters;
 
+   /* Append fog instructions now if the program has "OPTION ARB_fog_exp"
+    * or similar.  We used to leave this up to drivers, but it appears
+    * there's no hardware that wants to do fog in a discrete stage separate
+    * from the fragment shader.
+    */
+   if (program->FogOption != GL_NONE) {
+      _mesa_append_fog_code(ctx, program);
+      program->FogOption = GL_NONE;
+   }
+
 #if DEBUG_FP
    _mesa_printf("____________Fragment program %u ________\n", program->Base.ID);
    _mesa_print_program(&program->Base);
-- 
2.30.2