i965: Mostly fix glsl-max-varyings.

[mesa.git] / src / mesa / drivers / dri / i965 / brw_wm_pass1.c

diff --git a/src/mesa/drivers/dri/i965/brw_wm_pass1.c b/src/mesa/drivers/dri/i965/brw_wm_pass1.c
index 9c68bfd78b2e7f4c8fd08a8dd4797851db96347c..b44939402920083e2df8984e95268d7ea9100ccf 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_pass1.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_pass1.c
@@ -178,6 +178,11 @@ void brw_wm_pass1( struct brw_wm_compile *c )
         read1 = writemask;
         break;
 
+      case OPCODE_DDX:
+      case OPCODE_DDY:
+        read0 = writemask;
+        break;
+
       case OPCODE_MAD: 
       case OPCODE_CMP:
       case OPCODE_LRP: