i965: Emit conditional code updates as required for GLSL VS if statements.

Previously, we'd be branching based on whatever condition code happened to be
laying around.
(cherry picked from commit 7007f8b352763af89805f287153cb7972bff0523)

diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index b95079a5d13a19dc0628822292f7ed612cad6ff6..4887cdea5b2b73db1bdc1029c2a65d7a60fbf448 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -1448,6 +1448,19 @@ void brw_vs_emit(struct brw_vs_compile *c )
                                    "unknown");
       }
 
+      /* Set the predication update on the last instruction of the native
+       * instruction sequence.
+       *
+       * This would be problematic if it was set on a math instruction,
+       * but that shouldn't be the case with the current GLSL compiler.
+       */
+      if (inst->CondUpdate) {
+        struct brw_instruction *hw_insn = &p->store[p->nr_insn - 1];
+
+        assert(hw_insn->header.destreg__conditionalmod == 0);
+        hw_insn->header.destreg__conditionalmod = BRW_CONDITIONAL_NZ;
+      }
+
       if ((inst->DstReg.File == PROGRAM_OUTPUT)
           && (inst->DstReg.Index != VERT_RESULT_HPOS)
           && c->output_regs[inst->DstReg.Index].used_in_src) {