1 files changed, 151 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_tex_cache.h b/src/gallium/drivers/llvmpipe/lp_tex_cache.h
new file mode 100644
index 0000000000..9fa6c36812
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_tex_cache.h
@@ -0,0 +1,151 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+#ifndef LP_TEX_CACHE_H
+#define LP_TEX_CACHE_H
+
+
+#include "pipe/p_compiler.h"
+
+
+struct llvmpipe_context;
+struct llvmpipe_tex_tile_cache;
+
+
+/**
+ * Cache tile size (width and height). This needs to be a power of two.
+ */
+#define TEX_TILE_SIZE 64
+
+
+/* If we need to support > 4096, just expand this to be a 64 bit
+ * union, or consider tiling in Z as well.
+ */
+union tex_tile_address {
+   struct {
+      unsigned x:6;             /* 4096 / TEX_TILE_SIZE */
+      unsigned y:6;             /* 4096 / TEX_TILE_SIZE */
+      unsigned z:12;            /* 4096 -- z not tiled */
+      unsigned face:3;
+      unsigned level:4;
+      unsigned invalid:1;
+   } bits;
+   unsigned value;
+};
+
+
+struct llvmpipe_cached_tex_tile
+{
+   union tex_tile_address addr;
+   uint8_t color[TEX_TILE_SIZE][TEX_TILE_SIZE][4];
+};
+
+#define NUM_ENTRIES 50
+
+
+/** XXX move these */
+#define MAX_TEX_WIDTH 2048
+#define MAX_TEX_HEIGHT 2048
+
+
+struct llvmpipe_tex_tile_cache
+{
+   struct pipe_screen *screen;
+   struct pipe_surface *surface;  /**< the surface we're caching */
+   struct pipe_transfer *transfer;
+   void *transfer_map;
+
+   struct pipe_texture *texture;  /**< if caching a texture */
+   unsigned timestamp;
+
+   struct llvmpipe_cached_tex_tile entries[NUM_ENTRIES];
+
+   struct pipe_transfer *tex_trans;
+   void *tex_trans_map;
+   int tex_face, tex_level, tex_z;
+
+   struct llvmpipe_cached_tex_tile *last_tile;  /**< most recently retrieved tile */
+};
+
+
+extern struct llvmpipe_tex_tile_cache *
+lp_create_tex_tile_cache( struct pipe_screen *screen );
+
+extern void
+lp_destroy_tex_tile_cache(struct llvmpipe_tex_tile_cache *tc);
+
+extern void
+lp_tex_tile_cache_map_transfers(struct llvmpipe_tex_tile_cache *tc);
+
+extern void
+lp_tex_tile_cache_unmap_transfers(struct llvmpipe_tex_tile_cache *tc);
+
+extern void
+lp_tex_tile_cache_set_texture(struct llvmpipe_tex_tile_cache *tc,
+                          struct pipe_texture *texture);
+
+void
+lp_tex_tile_cache_validate_texture(struct llvmpipe_tex_tile_cache *tc);
+
+extern const struct llvmpipe_cached_tex_tile *
+lp_find_cached_tex_tile(struct llvmpipe_tex_tile_cache *tc,
+                        union tex_tile_address addr );
+
+static INLINE const union tex_tile_address
+tex_tile_address( unsigned x,
+                  unsigned y,
+                  unsigned z,
+                  unsigned face,
+                  unsigned level )
+{
+   union tex_tile_address addr;
+
+   addr.value = 0;
+   addr.bits.x = x / TEX_TILE_SIZE;
+   addr.bits.y = y / TEX_TILE_SIZE;
+   addr.bits.z = z;
+   addr.bits.face = face;
+   addr.bits.level = level;
+      
+   return addr;
+}
+
+/* Quickly retrieve tile if it matches last lookup.
+ */
+static INLINE const struct llvmpipe_cached_tex_tile *
+lp_get_cached_tex_tile(struct llvmpipe_tex_tile_cache *tc,
+                       union tex_tile_address addr )
+{
+   if (tc->last_tile->addr.value == addr.value)
+      return tc->last_tile;
+
+   return lp_find_cached_tex_tile( tc, addr );
+}
+
+
+#endif /* LP_TEX_CACHE_H */
+