Mesa (master): i965: Allocate temporaries contiguously with other regs in fragment shaders.

[Gary Wong]

Module: Mesa
Branch: master
Commit: e92a457ac0030e48f5260dc2ac00ca283be7d7ad
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e92a457ac0030e48f5260dc2ac00ca283be7d7ad

Author: Gary Wong <gtw at gnu.org>
Date:   Tue Oct 28 15:03:14 2008 -0400

i965: Allocate temporaries contiguously with other regs in fragment shaders.

This is required for threads to be spawned with correctly sized GRF
register blocks.

---

 src/mesa/drivers/dri/i965/brw_wm.h      |    2 ++
 src/mesa/drivers/dri/i965/brw_wm_glsl.c |    8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm.h b/src/mesa/drivers/dri/i965/brw_wm.h
index 297617e..b39b271 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.h
+++ b/src/mesa/drivers/dri/i965/brw_wm.h
@@ -246,7 +246,9 @@ struct brw_wm_compile {
    struct brw_reg stack;
    struct brw_reg emit_mask_reg;
    GLuint reg_index;
+   GLuint tmp_regs[BRW_WM_MAX_GRF];
    GLuint tmp_index;
+   GLuint tmp_max;
 };
 
 
diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
index 4d5e11f..b8a6b7b 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
@@ -47,13 +47,16 @@ static int get_scalar_dst_index(struct prog_instruction *inst)
 static struct brw_reg alloc_tmp(struct brw_wm_compile *c)
 {
     struct brw_reg reg;
-    reg = brw_vec8_grf(c->tmp_index--, 0);
+    if(c->tmp_index == c->tmp_max)
+	c->tmp_regs[ c->tmp_max++ ] = c->reg_index++;
+    
+    reg = brw_vec8_grf(c->tmp_regs[ c->tmp_index++ ], 0);
     return reg;
 }
 
 static void release_tmps(struct brw_wm_compile *c)
 {
-    c->tmp_index = 127;
+    c->tmp_index = 0;
 }
 
 static struct brw_reg 
@@ -1368,7 +1371,6 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c)
 void brw_wm_glsl_emit(struct brw_context *brw, struct brw_wm_compile *c)
 {
     brw_wm_pass_fp(c);
-    c->tmp_index = 127;
     brw_wm_emit_glsl(brw, c);
     c->prog_data.total_grf = c->reg_index;
     c->prog_data.total_scratch = 0;