Cell: initial texture cache/sampling code

src/mesa/pipe/cell/spu/spu_texture.c

@@ -0,0 +1,139 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 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.
+ * 
+ **************************************************************************/
+
+
+#include "pipe/p_compiler.h"
+#include "spu_main.h"
+#include "spu_texture.h"
+#include "spu_tile.h"
+
+
+/**
+ * Number of texture tiles to cache.
+ * Note that this will probably be the largest consumer of SPU local store/
+ * memory for this driver!
+ */
+#define CACHE_SIZE 16
+
+static tile_t tex_tiles[CACHE_SIZE]  ALIGN16_ATTRIB;
+
+static int tex_tile_x[CACHE_SIZE], tex_tile_y[CACHE_SIZE];
+
+
+
+/**
+ * Mark all tex cache entries as invalid.
+ */
+void
+invalidate_tex_cache(void)
+{
+   /* XXX memset? */
+   uint i;
+   for (i = 0; i < CACHE_SIZE; i++)
+      tex_tile_x[i] = tex_tile_y[i] = -1;
+}
+
+
+/**
+ * Return the cache pos/index which corresponds to texel (i,j)
+ */
+static INLINE uint
+cache_pos(uint i, uint j)
+{
+   uint tx = i / TILE_SIZE;
+   uint ty = j / TILE_SIZE;
+   uint pos = (tx + ty * 4) % CACHE_SIZE;
+   return pos;
+}
+
+
+/**
+ * Make sure the tile for texel (i,j) is present, return its position/index
+ * in the cache.
+ */
+static uint
+get_tex_tile(uint i, uint j)
+{
+   const int tx = i / TILE_SIZE;
+   const int ty = j / TILE_SIZE;
+   const uint pos = cache_pos(i, j);
+
+   if (tex_tile_x[pos] != tx || tex_tile_y[pos] != ty) {
+      /* texture cache miss, fetch tile from main memory */
+      const uint tiles_per_row = spu.texture.width / TILE_SIZE;
+      const uint bytes_per_tile = sizeof(tile_t);
+      const void *src = (const ubyte *) spu.texture.start
+         + (ty * tiles_per_row + tx) * bytes_per_tile;
+
+      printf("SPU %u: tex cache miss at %d, %d  pos=%u  old=%d,%d\n",
+             spu.init.id, tx, ty, pos,
+             tex_tile_x[pos], tex_tile_y[pos]);
+#if 0
+      printf("SPU %u: get tex tile from %p to %p\n",
+             spu.init.id, src, tex_tiles[pos].t32);
+#endif
+
+      ASSERT_ALIGN16(tex_tiles[pos].t32);
+      ASSERT_ALIGN16(src);
+
+      mfc_get(tex_tiles[pos].t32,  /* dest */
+              (unsigned int) src,
+              bytes_per_tile,      /* size */
+              TAG_TEXTURE_TILE,
+              0, /* tid */
+              0  /* rid */);
+
+      wait_on_mask(1 << TAG_TEXTURE_TILE);
+
+      tex_tile_x[pos] = tx;
+      tex_tile_y[pos] = ty;
+   }
+   else {
+#if 0
+      printf("SPU %u: tex cache HIT at %d, %d\n",
+             spu.init.id, tx, ty);
+#endif
+   }
+
+   return pos;
+}
+
+
+/**
+ * Get texture sample at texcoord.
+ * XXX this is extremely primitive for now.
+ */
+uint
+sample_texture(const float *texcoord)
+{
+   /* wrap/repeat */
+   uint i = (uint) (texcoord[0] * spu.texture.width) % spu.texture.width;
+   uint j = (uint) (texcoord[1] * spu.texture.height) % spu.texture.height;
+   uint pos = get_tex_tile(i, j);
+   uint texel = tex_tiles[pos].t32[j % TILE_SIZE][i % TILE_SIZE];
+   return texel;
+}

src/mesa/pipe/cell/spu/spu_texture.h

@@ -0,0 +1,43 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 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 SPU_TEXTURE_H
+#define SPU_TEXTURE_H
+
+
+#include "pipe/p_compiler.h"
+
+
+extern void
+invalidate_tex_cache(void);
+
+
+extern uint
+sample_texture(const float *texcoord);
+
+
+#endif /* SPU_TEXTURE_H */