i965: Use immediate float operands for some VS instructions.

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

diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
index d9d6ddae8c454e016b39b284179e782e1f202b47..88b885cb94147bc981e4f66ffc471a1c943f3052 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
@@ -570,12 +570,35 @@ static struct brw_reg get_src_reg(struct brw_wm_compile *c,
     const GLuint nr = 1;
     const GLuint component = GET_SWZ(src->Swizzle, channel);
 
-    /* Extended swizzle terms */
-    if (component == SWIZZLE_ZERO) {
-       return brw_imm_f(0.0F);
-    }
-    else if (component == SWIZZLE_ONE) {
-       return brw_imm_f(1.0F);
+    /* Only one immediate value can be used per native opcode, and it
+     * has be in the src1 slot, so not all Mesa instructions will get
+     * to take advantage of immediate constants.
+     */
+    if (brw_wm_arg_can_be_immediate(inst->Opcode, srcRegIndex)) {
+       const struct gl_program_parameter_list *params;
+
+       params = c->fp->program.Base.Parameters;
+
+       /* Extended swizzle terms */
+       if (component == SWIZZLE_ZERO) {
+         return brw_imm_f(0.0F);
+       } else if (component == SWIZZLE_ONE) {
+         if (src->Negate)
+            return brw_imm_f(-1.0F);
+         else
+            return brw_imm_f(1.0F);
+       }
+
+       if (src->File == PROGRAM_CONSTANT) {
+         float f = params->ParameterValues[src->Index][component];
+
+         if (src->Abs)
+            f = fabs(f);
+         if (src->Negate)
+            f = -f;
+
+         return brw_imm_f(f);
+       }
     }
 
     if (c->fp->use_const_buffer &&
@@ -2047,7 +2070,7 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c)
                   struct brw_instruction *inst0, *inst1;
                   GLuint br = 1;
 
-                  if (intel->is_ironlake)
+                  if (intel->gen == 5)
                      br = 2;
 
                  assert(loop_depth > 0);