i965: Set the CC VP state immediately on state change.

The cache lookup of these two little floats was .12% of total CPU time
on firefox-talos-gfx because we did it any time commonly-changed state
changed.  On the other hand, updating the CC VP bo immediately whenver
CC VP state changes is a .07% overhead due to putting a driver hoook
in glEnable().

src/mesa/drivers/dri/i965/Makefile

@@ -61,6 +61,7 @@ DRIVER_SOURCES = \
 	brw_sf.c \
 	brw_sf_emit.c \
 	brw_sf_state.c \
+	brw_state.c \
 	brw_state_batch.c \
 	brw_state_cache.c \
 	brw_state_dump.c \

src/mesa/drivers/dri/i965/brw_cc.c

@@ -36,7 +36,8 @@
 #include "brw_util.h"
 #include "main/macros.h"
 
-static void prepare_cc_vp( struct brw_context *brw )
+void
+brw_update_cc_vp(struct brw_context *brw)
 {
    GLcontext *ctx = &brw->intel.ctx;
    struct brw_cc_viewport ccv;
@@ -58,15 +59,6 @@ static void prepare_cc_vp( struct brw_context *brw )
 				  NULL, 0);
 }
 
-const struct brw_tracked_state brw_cc_vp = {
-   .dirty = {
-      .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
-      .brw = BRW_NEW_CONTEXT,
-      .cache = 0
-   },
-   .prepare = prepare_cc_vp
-};
-
 struct brw_cc_unit_key {
    GLboolean stencil, stencil_two_side, color_blend, alpha_enabled;
 

src/mesa/drivers/dri/i965/brw_context.c

@@ -54,6 +54,9 @@ static void brwInitDriverFunctions( struct dd_function_table *functions )
 
    brwInitFragProgFuncs( functions );
    brw_init_queryobj_functions(functions);
+
+   functions->Enable = brw_enable;
+   functions->DepthRange = brw_depth_range;
 }
 
 GLboolean brwCreateContext( int api,
@@ -187,6 +190,11 @@ GLboolean brwCreateContext( int api,
 
    brw_draw_init( brw );
 
+   /* Now that most driver functions are hooked up, initialize some of the
+    * immediate state.
+    */
+   brw_update_cc_vp(brw);
+
    return GL_TRUE;
 }
 

src/mesa/drivers/dri/i965/brw_context.h

@@ -727,6 +727,9 @@ void brwInitFragProgFuncs( struct dd_function_table *functions );
  */
 void brw_upload_urb_fence(struct brw_context *brw);
 
+/* brw_cc.c */
+void brw_update_cc_vp(struct brw_context *brw);
+
 /* brw_curbe.c
  */
 void brw_upload_cs_urb_state(struct brw_context *brw);
@@ -734,6 +737,10 @@ void brw_upload_cs_urb_state(struct brw_context *brw);
 /* brw_disasm.c */
 int brw_disasm (FILE *file, struct brw_instruction *inst, int gen);
 
+/* brw_state.c */
+void brw_enable(GLcontext * ctx, GLenum cap, GLboolean state);
+void brw_depth_range(GLcontext *ctx, GLclampd nearval, GLclampd farval);
+
 /*======================================================================
  * Inline conversion functions.  These are better-typed than the
  * macros used previously:

src/mesa/drivers/dri/i965/brw_state.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include "brw_context.h"
+
+void
+brw_enable(GLcontext *ctx, GLenum cap, GLboolean state)
+{
+   struct brw_context *brw = brw_context(ctx);
+
+   switch (cap) {
+   case GL_DEPTH_CLAMP:
+      brw_update_cc_vp(brw);
+      break;
+   }
+}
+
+void
+brw_depth_range(GLcontext *ctx, GLclampd nearval, GLclampd farval)
+{
+   struct brw_context *brw = brw_context(ctx);
+
+   if (ctx->Transform.DepthClamp)
+      brw_update_cc_vp(brw);
+}

src/mesa/drivers/dri/i965/brw_state.h

@@ -48,7 +48,6 @@ brw_add_validated_bo(struct brw_context *brw, drm_intel_bo *bo)
 
 const struct brw_tracked_state brw_blend_constant_color;
 const struct brw_tracked_state brw_cc_unit;
-const struct brw_tracked_state brw_cc_vp;
 const struct brw_tracked_state brw_check_fallback;
 const struct brw_tracked_state brw_clip_prog;
 const struct brw_tracked_state brw_clip_unit;

src/mesa/drivers/dri/i965/brw_state_upload.c

@@ -61,7 +61,6 @@ static const struct brw_tracked_state *gen4_atoms[] =
    &brw_curbe_offsets,
    &brw_recalculate_urb_fence,
 
-   &brw_cc_vp,
    &brw_cc_unit,
 
    &brw_vs_surfaces,		/* must do before unit */