From f117327a3f246713abfd4dc4320d4a1a7f1b811a Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack@tungstengraphics.com>
Date: Mon, 17 Sep 2007 09:47:41 -0400
Subject: Make sampler an immutable state object.

Switch the sample to be an immutable state object.
---
 src/mesa/state_tracker/st_atom_sampler.c  | 10 +++++++---
 src/mesa/state_tracker/st_cache.c         | 17 +++++++++++++++++
 src/mesa/state_tracker/st_cache.h         |  6 ++++++
 src/mesa/state_tracker/st_cb_drawpixels.c |  6 ++++--
 src/mesa/state_tracker/st_context.h       |  4 ++--
 5 files changed, 36 insertions(+), 7 deletions(-)

(limited to 'src/mesa/state_tracker')

diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c
index d65565f991..9a728e2d79 100644
--- a/src/mesa/state_tracker/st_atom_sampler.c
+++ b/src/mesa/state_tracker/st_atom_sampler.c
@@ -33,6 +33,7 @@
  
 
 #include "st_context.h"
+#include "st_cache.h"
 #include "st_atom.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
@@ -142,10 +143,13 @@ update_samplers(struct st_context *st)
          /* XXX more sampler state here */
       }
 
-      if (memcmp(&sampler, &st->state.sampler[u], sizeof(sampler)) != 0) {
+      const struct pipe_sampler_state *cached_sampler =
+         st_cached_sampler_state(st, &sampler);
+
+      if (cached_sampler == st->state.sampler[u]) {
          /* state has changed */
-         st->state.sampler[u] = sampler;
-         st->pipe->set_sampler_state(st->pipe, u, &sampler);
+         st->state.sampler[u] = cached_sampler;
+         st->pipe->bind_sampler_state(st->pipe, u, cached_sampler);
       }
    }
 }
diff --git a/src/mesa/state_tracker/st_cache.c b/src/mesa/state_tracker/st_cache.c
index 0205b1cab3..99fb45f00a 100644
--- a/src/mesa/state_tracker/st_cache.c
+++ b/src/mesa/state_tracker/st_cache.c
@@ -59,3 +59,20 @@ struct pipe_blend_state * st_cached_blend_state(
    }
    return (struct pipe_blend_state*)(cso_hash_iter_data(iter));
 }
+
+struct pipe_sampler_state * st_cached_sampler_state(
+   struct st_context *st,
+   const struct pipe_sampler_state *sampler)
+{
+   unsigned hash_key = cso_construct_key((void*)sampler, sizeof(struct pipe_sampler_state));
+   struct cso_hash_iter iter = cso_find_state_template(st->cache,
+                                                       hash_key, CSO_SAMPLER,
+                                                       (void*)sampler);
+   if (cso_hash_iter_is_null(iter)) {
+      const struct pipe_sampler_state *created_state = st->pipe->create_sampler_state(
+         st->pipe, sampler);
+      iter = cso_insert_state(st->cache, hash_key, CSO_SAMPLER,
+                              (void*)created_state);
+   }
+   return (struct pipe_sampler_state*)(cso_hash_iter_data(iter));
+}
diff --git a/src/mesa/state_tracker/st_cache.h b/src/mesa/state_tracker/st_cache.h
index 29b1d00dca..927585141c 100644
--- a/src/mesa/state_tracker/st_cache.h
+++ b/src/mesa/state_tracker/st_cache.h
@@ -34,10 +34,16 @@
 #define ST_CACHE_H
 
 struct pipe_blend_state;
+struct pipe_sampler_state;
 struct st_context;
 
 struct pipe_blend_state * st_cached_blend_state(
    struct st_context *st,
    const struct pipe_blend_state *blend);
 
+struct pipe_sampler_state * st_cached_sampler_state(
+   struct st_context *st,
+   const struct pipe_sampler_state *sampler);
+
+
 #endif
diff --git a/src/mesa/state_tracker/st_cb_drawpixels.c b/src/mesa/state_tracker/st_cb_drawpixels.c
index c2d231cdb5..31a37e5cd4 100644
--- a/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -34,6 +34,7 @@
 
 #include "st_context.h"
 #include "st_atom.h"
+#include "st_cache.h"
 #include "st_draw.h"
 #include "st_program.h"
 #include "st_cb_drawpixels.h"
@@ -359,7 +360,8 @@ draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
-      pipe->set_sampler_state(pipe, unit, &sampler);
+      const struct pipe_sampler_state *state = st_cached_sampler_state(ctx->st, &sampler);
+      pipe->bind_sampler_state(pipe, unit, state);
    }
 
    /* viewport state: viewport matching window dims */
@@ -402,7 +404,7 @@ draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
    pipe->set_fs_state(pipe, &ctx->st->state.fs);
    pipe->set_vs_state(pipe, &ctx->st->state.vs);
    pipe->set_texture_state(pipe, unit, ctx->st->state.texture[unit]);
-   pipe->set_sampler_state(pipe, unit, &ctx->st->state.sampler[unit]);
+   pipe->bind_sampler_state(pipe, unit, ctx->st->state.sampler[unit]);
    pipe->set_viewport_state(pipe, &ctx->st->state.viewport);
 
    free_mipmap_tree(pipe, mt);
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index bd2efdb960..13526ff9e7 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -74,7 +74,8 @@ struct st_context
     * though, we just shove random objects across the interface.  
     */
    struct {
-      const struct pipe_blend_state  *blend;
+      const struct pipe_blend_state   *blend;
+      const struct pipe_sampler_state *sampler[PIPE_MAX_SAMPLERS];
 
       struct pipe_alpha_test_state  alpha_test;
       struct pipe_blend_color  blend_color;
@@ -86,7 +87,6 @@ struct st_context
       struct pipe_framebuffer_state framebuffer;
       struct pipe_mipmap_tree *texture[PIPE_MAX_SAMPLERS];
       struct pipe_poly_stipple poly_stipple;
-      struct pipe_sampler_state sampler[PIPE_MAX_SAMPLERS];
       struct pipe_scissor_state scissor;
       struct pipe_setup_state  setup;
       struct pipe_shader_state fs;
-- 
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