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/**************************************************************************
*
* 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;
}
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