i965: Make the param pointer arrays for the WM dynamically sized.

Saves 26.5MB of wasted memory allocation in the l4d2 demo.

v2: Rebase on compare func change, fix comments.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> (v1)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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

@@ -322,8 +322,8 @@ struct brw_wm_prog_data {
     * These must be the last fields of the struct (see
     * brw_wm_prog_data_compare()).
     */
-   const float *param[MAX_UNIFORMS * 4]; /* should be: BRW_MAX_CURBE */
-   const float *pull_param[MAX_UNIFORMS * 4];
+   const float **param;
+   const float **pull_param;
 };
 
 /**
@@ -631,6 +631,7 @@ struct brw_cache_item {
 
 typedef bool (*cache_aux_compare_func)(const void *a, const void *b,
                                        int aux_size, const void *key);
+typedef void (*cache_aux_free_func)(const void *aux);
 
 struct brw_cache {
    struct brw_context *brw;
@@ -648,6 +649,8 @@ struct brw_cache {
     * outside of the prog_data).  If NULL, a plain memcmp is done.
     */
    cache_aux_compare_func aux_compare[BRW_MAX_CACHE];
+   /** Optional functions for freeing other pointers attached to a prog_data. */
+   cache_aux_free_func aux_free[BRW_MAX_CACHE];
 };
 
 

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -528,8 +528,6 @@ fs_visitor::setup_uniform_values(int loc, const glsl_type *type)
       for (unsigned int i = 0; i < type->vector_elements; i++) {
 	 unsigned int param = c->prog_data.nr_params++;
 
-	 assert(param < ARRAY_SIZE(c->prog_data.param));
-
 	 this->param_index[param] = loc;
 	 this->param_offset[param] = i;
       }

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

@@ -343,6 +343,7 @@ brw_init_caches(struct brw_context *brw)
 
    cache->aux_compare[BRW_VS_PROG] = brw_vs_prog_data_compare;
    cache->aux_compare[BRW_WM_PROG] = brw_wm_prog_data_compare;
+   cache->aux_free[BRW_WM_PROG] = brw_wm_prog_data_free;
 }
 
 static void
@@ -357,6 +358,10 @@ brw_clear_cache(struct brw_context *brw, struct brw_cache *cache)
    for (i = 0; i < cache->size; i++) {
       for (c = cache->items[i]; c; c = next) {
 	 next = c->next;
+         if (cache->aux_free[c->cache_id]) {
+            const void *item_aux = c->key + c->key_size;
+            cache->aux_free[c->cache_id](item_aux);
+         }
 	 free((void *)c->key);
 	 free(c);
       }

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

@@ -273,6 +273,15 @@ brw_wm_prog_data_compare(const void *in_a, const void *in_b,
    return true;
 }
 
+void
+brw_wm_prog_data_free(const void *in_prog_data)
+{
+   const struct brw_wm_prog_data *prog_data = in_prog_data;
+
+   ralloc_free((void *)prog_data->param);
+   ralloc_free((void *)prog_data->pull_param);
+}
+
 /**
  * All Mesa program -> GPU code generation goes through this function.
  * Depending on the instructions used (i.e. flow control instructions)
@@ -286,8 +295,12 @@ bool do_wm_prog(struct brw_context *brw,
    struct intel_context *intel = &brw->intel;
    struct brw_wm_compile *c;
    const GLuint *program;
+   struct gl_shader *fs = NULL;
    GLuint program_size;
 
+   if (prog)
+      fs = prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
+
    c = brw->wm.compile_data;
    if (c == NULL) {
       brw->wm.compile_data = rzalloc(NULL, struct brw_wm_compile);
@@ -310,6 +323,28 @@ bool do_wm_prog(struct brw_context *brw,
       c->vreg = vreg;
       c->refs = refs;
    }
+
+   /* Allocate the references to the uniforms that will end up in the
+    * prog_data associated with the compiled program, and which will be freed
+    * by the state cache.
+    */
+   if (fs) {
+      int param_count = fs->num_uniform_components;
+      /* The backend also sometimes adds params for texture size. */
+      param_count += 2 * BRW_MAX_TEX_UNIT;
+
+      c->prog_data.param = rzalloc_array(c, const float *, param_count);
+      c->prog_data.pull_param = rzalloc_array(c, const float *, param_count);
+   } else {
+      /* brw_wm_pass0.c will also add references to 0.0 and 1.0 which are
+       * uploaded as push parameters.
+       */
+      int param_count = (fp->program.Base.Parameters->NumParameters + 2) * 4;
+      c->prog_data.param = rzalloc_array(c, const float *, param_count);
+      /* The old backend never does pull constants. */
+      c->prog_data.pull_param = NULL;
+   }
+
    memcpy(&c->key, key, sizeof(*key));
 
    c->fp = fp;

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

@@ -486,5 +486,6 @@ void brw_wm_debug_recompile(struct brw_context *brw,
                             const struct brw_wm_prog_key *key);
 bool brw_wm_prog_data_compare(const void *a, const void *b,
                               int aux_size, const void *key);
+void brw_wm_prog_data_free(const void *in_prog_data);
 
 #endif