memory usage fixes for glean/conform, use a better hash function

src/mesa/main/texenvprogram.c

@@ -185,12 +185,12 @@ static GLuint translate_tex_src_bit( GLbitfield bit )
  * Examine current texture environment state and generate a unique
  * key to identify it.
  */
-static struct state_key *
-make_state_key(GLcontext *ctx)
+static void make_state_key( GLcontext *ctx,  struct state_key *key )
 {
-   struct state_key *key = CALLOC_STRUCT(state_key);
    GLuint i, j;
 	
+   memset(key, 0, sizeof(*key));
+
    for (i=0;i<MAX_TEXTURE_UNITS;i++) {
       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
 		
@@ -233,8 +233,6 @@ make_state_key(GLcontext *ctx)
       key->fog_enabled = 1;
       key->fog_mode = translate_fog_mode(ctx->Fog.Mode);
    }
-	
-   return key;
 }
 
 /* Use uregs to represent registers internally, translate to Mesa's
@@ -1142,6 +1140,26 @@ static void rehash( struct texenvprog_cache *cache )
    cache->size = size;
 }
 
+static void clear_cache( struct texenvprog_cache *cache )
+{
+   struct texenvprog_cache_item *c, *next;
+   GLuint i;
+
+   for (i = 0; i < cache->size; i++) {
+      for (c = cache->items[i]; c; c = next) {
+	 next = c->next;
+	 _mesa_free(c->key);
+	 cache->ctx->Driver.DeleteProgram(cache->ctx, (struct program *)c->data);
+	 _mesa_free(c);
+      }
+      cache->items[i] = NULL;
+   }
+
+
+   cache->n_items = 0;
+}
+
+
 static void cache_item( struct texenvprog_cache *cache,
 			GLuint hash,
 			void *key,
@@ -1149,12 +1167,20 @@ static void cache_item( struct texenvprog_cache *cache,
 {
    struct texenvprog_cache_item *c = MALLOC(sizeof(*c));
    c->hash = hash;
-   c->key = key;
+
+   c->key = _mesa_malloc(sizeof(*key));
+   memcpy(c->key, key, sizeof(*key));
+
    c->data = data;
 
-   if (++cache->n_items > cache->size * 1.5)
-      rehash(cache);
+   if (cache->n_items > cache->size * 1.5) {
+      if (cache->size < 1000)
+	 rehash(cache);
+      else 
+	 clear_cache(cache);
+   }
 
+   cache->n_items++;
    c->next = cache->items[hash % cache->size];
    cache->items[hash % cache->size] = c;
 }
@@ -1164,27 +1190,31 @@ static GLuint hash_key( struct state_key *key )
    GLuint *ikey = (GLuint *)key;
    GLuint hash = 0, i;
 
-   /* I'm sure this can be improved on, but speed is important:
+   /* Make a slightly better attempt at a hash function:
     */
-   for (i = 0; i < sizeof(*key)/sizeof(GLuint); i++)
-      hash ^= ikey[i];
+   for (i = 0; i < sizeof(*key)/sizeof(*ikey); i++)
+   {
+      hash += ikey[i];
+      hash += (hash << 10);
+      hash ^= (hash >> 6);
+   }
 
    return hash;
 }
 
 void _mesa_UpdateTexEnvProgram( GLcontext *ctx )
 {
-   struct state_key *key;
+   struct state_key key;
    GLuint hash;
    struct fragment_program *prev = ctx->FragmentProgram._Current;
 	
    if (!ctx->FragmentProgram._Enabled) {
-      key = make_state_key(ctx);
-      hash = hash_key(key);
+      make_state_key(ctx, &key);
+      hash = hash_key(&key);
       
       ctx->FragmentProgram._Current = ctx->_TexEnvProgram =
 	 (struct fragment_program *)
-	 search_cache(&ctx->Texture.env_fp_cache, hash, key, sizeof(*key));
+	 search_cache(&ctx->Texture.env_fp_cache, hash, &key, sizeof(key));
 	
       if (!ctx->_TexEnvProgram) {
 	 if (0) _mesa_printf("Building new texenv proggy for key %x\n", hash);
@@ -1193,11 +1223,10 @@ void _mesa_UpdateTexEnvProgram( GLcontext *ctx )
 	    (struct fragment_program *) 
 	    ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 		
-	 create_new_program(key, ctx, ctx->_TexEnvProgram);
+	 create_new_program(&key, ctx, ctx->_TexEnvProgram);
 
-	 cache_item(&ctx->Texture.env_fp_cache, hash, key, ctx->_TexEnvProgram);
+	 cache_item(&ctx->Texture.env_fp_cache, hash, &key, ctx->_TexEnvProgram);
       } else {
-	 _mesa_free(key);
 	 if (0) _mesa_printf("Found existing texenv program for key %x\n", hash);
       }
    } 
@@ -1217,6 +1246,7 @@ void _mesa_UpdateTexEnvProgram( GLcontext *ctx )
 
 void _mesa_TexEnvProgramCacheInit( GLcontext *ctx )
 {
+   ctx->Texture.env_fp_cache.ctx = ctx;
    ctx->Texture.env_fp_cache.size = 17;
    ctx->Texture.env_fp_cache.n_items = 0;
    ctx->Texture.env_fp_cache.items = (struct texenvprog_cache_item **)
@@ -1227,16 +1257,6 @@ void _mesa_TexEnvProgramCacheInit( GLcontext *ctx )
 
 void _mesa_TexEnvProgramCacheDestroy( GLcontext *ctx )
 {
-   struct texenvprog_cache_item *c, *next;
-   GLuint i;
-
-   for (i = 0; i < ctx->Texture.env_fp_cache.size; i++)
-      for (c = ctx->Texture.env_fp_cache.items[i]; c; c = next) {
-	 next = c->next;
-	 _mesa_free(c->key);
-	 _mesa_free(c->data);
-	 _mesa_free(c);
-      }
-
+   clear_cache(&ctx->Texture.env_fp_cache);
    _mesa_free(ctx->Texture.env_fp_cache.items);
 }