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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"
#include "spu_colorpack.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 vector unsigned int tex_tile_xy[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_xy[i] = ((vector unsigned int) { ~0U, ~0U, ~0U, ~0U });
}
}
/**
* Return the cache pos/index which corresponds to tile (tx,ty)
*/
static INLINE uint
cache_pos(vector unsigned int txty)
{
uint pos = (spu_extract(txty,0) + spu_extract(txty,1) * 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(vector unsigned int ij)
{
/* tile address: tx,ty */
const vector unsigned int txty = spu_rlmask(ij, -5); /* divide by 32 */
const uint pos = cache_pos(txty);
if ((spu_extract(tex_tile_xy[pos], 0) != spu_extract(txty, 0)) ||
(spu_extract(tex_tile_xy[pos], 1) != spu_extract(txty, 1))) {
/* 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
+ (spu_extract(txty,1) * tiles_per_row + spu_extract(txty,0)) * bytes_per_tile;
printf("SPU %u: tex cache miss at %d, %d pos=%u old=%d,%d\n",
spu.init.id,
spu_extract(txty,0),
spu_extract(txty,1),
pos,
spu_extract(tex_tile_xy[pos],0),
spu_extract(tex_tile_xy[pos],1));
ASSERT_ALIGN16(tex_tiles[pos].ui);
ASSERT_ALIGN16(src);
mfc_get(tex_tiles[pos].ui, /* dest */
(unsigned int) src,
bytes_per_tile, /* size */
TAG_TEXTURE_TILE,
0, /* tid */
0 /* rid */);
wait_on_mask(1 << TAG_TEXTURE_TILE);
tex_tile_xy[pos] = txty;
}
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.
*/
vector float
sample_texture_nearest(vector float texcoord)
{
vector float tc = spu_mul(texcoord, spu.tex_size);
vector unsigned int itc = spu_convtu(tc, 0); /* convert to int */
itc = spu_and(itc, spu.tex_size_mask); /* mask (GL_REPEAT) */
vector unsigned int ij = spu_and(itc, TILE_SIZE-1); /* intra tile addr */
uint pos = get_tex_tile(itc);
uint texel = tex_tiles[pos].ui[spu_extract(ij, 1)][spu_extract(ij, 0)];
return spu_unpack_A8R8G8B8(texel);
}
vector float
sample_texture_bilinear(vector float texcoord)
{
static const vector unsigned int offset10 = {1, 0, 0, 0};
static const vector unsigned int offset01 = {0, 1, 0, 0};
vector float tc = spu_mul(texcoord, spu.tex_size);
tc = spu_add(tc, spu_splats(-0.5f)); /* half texel bias */
/* integer texcoords S,T: */
vector unsigned int itc00 = spu_convtu(tc, 0); /* convert to int */
vector unsigned int itc01 = spu_add(itc00, offset01);
vector unsigned int itc10 = spu_add(itc00, offset10);
vector unsigned int itc11 = spu_add(itc10, offset01);
/* mask (GL_REPEAT) */
itc00 = spu_and(itc00, spu.tex_size_mask);
itc01 = spu_and(itc01, spu.tex_size_mask);
itc10 = spu_and(itc10, spu.tex_size_mask);
itc11 = spu_and(itc11, spu.tex_size_mask);
/* intra tile addr */
vector unsigned int ij00 = spu_and(itc00, TILE_SIZE-1);
vector unsigned int ij01 = spu_and(itc01, TILE_SIZE-1);
vector unsigned int ij10 = spu_and(itc10, TILE_SIZE-1);
vector unsigned int ij11 = spu_and(itc11, TILE_SIZE-1);
/* get tile cache positions */
uint pos00 = get_tex_tile(itc00);
uint pos01, pos10, pos11;
if ((spu_extract(ij00, 0) < TILE_SIZE-1) &&
(spu_extract(ij00, 1) < TILE_SIZE-1)) {
/* all texels are in the same tile */
pos01 = pos10 = pos11 = pos00;
}
else {
pos01 = get_tex_tile(itc01);
pos10 = get_tex_tile(itc10);
pos11 = get_tex_tile(itc11);
}
/* get texels from tiles and convert to float[4] */
vector float texel00 = spu_unpack_A8R8G8B8(tex_tiles[pos00].ui[spu_extract(ij00, 1)][spu_extract(ij00, 0)]);
vector float texel01 = spu_unpack_A8R8G8B8(tex_tiles[pos01].ui[spu_extract(ij01, 1)][spu_extract(ij01, 0)]);
vector float texel10 = spu_unpack_A8R8G8B8(tex_tiles[pos10].ui[spu_extract(ij10, 1)][spu_extract(ij10, 0)]);
vector float texel11 = spu_unpack_A8R8G8B8(tex_tiles[pos11].ui[spu_extract(ij11, 1)][spu_extract(ij11, 0)]);
/* Compute weighting factors in [0,1]
* Multiply texcoord by 1024, AND with 1023, convert back to float.
*/
vector float tc1024 = spu_mul(tc, spu_splats(1024.0f));
vector signed int itc1024 = spu_convts(tc1024, 0);
itc1024 = spu_and(itc1024, spu_splats((1 << 10) - 1));
vector float weight = spu_convtf(itc1024, 10);
/* smeared frac and 1-frac */
vector float sfrac = spu_splats(spu_extract(weight, 0));
vector float tfrac = spu_splats(spu_extract(weight, 1));
vector float sfrac1 = spu_sub(spu_splats(1.0f), sfrac);
vector float tfrac1 = spu_sub(spu_splats(1.0f), tfrac);
/* multiply the samples (colors) by the S/T weights */
texel00 = spu_mul(spu_mul(texel00, sfrac1), tfrac1);
texel10 = spu_mul(spu_mul(texel10, sfrac ), tfrac1);
texel01 = spu_mul(spu_mul(texel01, sfrac1), tfrac );
texel11 = spu_mul(spu_mul(texel11, sfrac ), tfrac );
/* compute sum of weighted samples */
vector float texel_sum = spu_add(texel00, texel01);
texel_sum = spu_add(texel_sum, texel10);
texel_sum = spu_add(texel_sum, texel11);
return texel_sum;
}
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