From 63556fa9949f543a8134b6b5ff3d216acb71dd9f Mon Sep 17 00:00:00 2001
From: Brian <brian@yutani.localnet.net>
Date: Fri, 23 Mar 2007 14:47:46 -0600
Subject: Add the ability to generate programs that doesn't use condition
 codes.

ctx->Shader.EmitCondCodes determines if we use condition codes.
If not, IF statement uses first operand's X component as the condition.
Added OPCODE_BRK0, OPCODE_BRK1, OPCODE_CONT0, OPCODE_CONT1 to handle
the common cases of conditional break/continue.
---
 src/mesa/shader/prog_execute.c | 53 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 46 insertions(+), 7 deletions(-)

(limited to 'src/mesa/shader/prog_execute.c')

diff --git a/src/mesa/shader/prog_execute.c b/src/mesa/shader/prog_execute.c
index 092c07f7b6..f881d477ca 100644
--- a/src/mesa/shader/prog_execute.c
+++ b/src/mesa/shader/prog_execute.c
@@ -720,6 +720,32 @@ _mesa_execute_program(GLcontext * ctx,
             pc = inst->BranchTarget - 1;
          }
          break;
+      case OPCODE_BRK0:   /* Break if zero */
+         /* fall-through */
+      case OPCODE_CONT0:  /* Continue if zero */
+         {
+            GLfloat a[4];
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            if (a[0] == 0.0) {
+               /* take branch */
+               /* Subtract 1 here since we'll do pc++ at end of for-loop */
+               pc = inst->BranchTarget - 1;
+            }
+         }
+         break;
+      case OPCODE_BRK1:   /* Break if non-zero */
+         /* fall-through */
+      case OPCODE_CONT1:  /* Continue if non-zero */
+         {
+            GLfloat a[4];
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            if (a[0] != 0.0) {
+               /* take branch */
+               /* Subtract 1 here since we'll do pc++ at end of for-loop */
+               pc = inst->BranchTarget - 1;
+            }
+         }
+         break;
       case OPCODE_CAL:         /* Call subroutine (conditional) */
          if (eval_condition(machine, inst)) {
             /* call the subroutine */
@@ -914,13 +940,26 @@ _mesa_execute_program(GLcontext * ctx,
          }
          break;
       case OPCODE_IF:
-         if (eval_condition(machine, inst)) {
-            /* do if-clause (just continue execution) */
-         }
-         else {
-            /* go to the instruction after ELSE or ENDIF */
-            assert(inst->BranchTarget >= 0);
-            pc = inst->BranchTarget - 1;
+         {
+            GLboolean cond;
+            /* eval condition */
+            if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {
+               GLfloat a[4];
+               fetch_vector1(&inst->SrcReg[0], machine, a);
+               cond = (a[0] != 0.0);
+            }
+            else {
+               cond = eval_condition(machine, inst);
+            }
+            /* do if/else */
+            if (cond) {
+               /* do if-clause (just continue execution) */
+            }
+            else {
+               /* go to the instruction after ELSE or ENDIF */
+               assert(inst->BranchTarget >= 0);
+               pc = inst->BranchTarget - 1;
+            }
          }
          break;
       case OPCODE_ELSE:
-- 
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