Tested by piglit ati_draw_buffers-arbfp.
---
 src/mesa/program/program_parse_extra.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/src/mesa/program/program_parse_extra.c 
b/src/mesa/program/program_parse_extra.c
index ae98b78..9ade9be 100644
--- a/src/mesa/program/program_parse_extra.c
+++ b/src/mesa/program/program_parse_extra.c
@@ -207,7 +207,7 @@ _mesa_ARBfp_parse_option(struct asm_parser_state *state, 
const char *option)
         return 0;
       } else if (strcmp(option, "draw_buffers") == 0) {
         /* Don't need to check extension availability because all Mesa-based
-         * drivers support GL_ARB_draw_buffers.
+         * drivers support GL_ATI_draw_buffers.
          */
         state->option.DrawBuffers = 1;
         return 1;
@@ -229,6 +229,16 @@ _mesa_ARBfp_parse_option(struct asm_parser_state *state, 
const char *option)
             }
          }
       }
+   } else if (strncmp(option, "ATI_", 4) == 0) {
+      option += 4;
+
+      if (strcmp(option, "draw_buffers") == 0) {
+        /* Don't need to check extension availability because all Mesa-based
+         * drivers support GL_ARB_draw_buffers.
+         */
+        state->option.DrawBuffers = 1;
+        return 1;
+      }
    } else if (strncmp(option, "NV_fragment_program", 19) == 0) {
       option += 19;
 
-- 
1.7.4.1

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