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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"
#include "spu_dcache.h"
/**
* Mark all tex cache entries as invalid.
*/
void
invalidate_tex_cache(void)
{
uint unit = 0;
uint bytes = 4 * spu.texture[unit].width
* spu.texture[unit].height;
spu_dcache_mark_dirty((unsigned) spu.texture[unit].start, bytes);
}
/**
* XXX look into getting texels for all four pixels in a quad at once.
*/
static uint
get_texel(uint unit, vec_uint4 coordinate)
{
/*
* XXX we could do the "/ TILE_SIZE" and "% TILE_SIZE" operations as
* SIMD since X and Y are already in a SIMD register.
*/
const unsigned texture_ea = (uintptr_t) spu.texture[unit].start;
ushort x = spu_extract(coordinate, 0);
ushort y = spu_extract(coordinate, 1);
unsigned tile_offset = sizeof(tile_t)
* ((y / TILE_SIZE * spu.texture[unit].tiles_per_row) + (x / TILE_SIZE));
ushort texel_offset = (ushort) 4
* (ushort) (((ushort) (y % TILE_SIZE) * (ushort) TILE_SIZE) + (x % TILE_SIZE));
vec_uint4 tmp;
spu_dcache_fetch_unaligned((qword *) & tmp,
texture_ea + tile_offset + texel_offset,
4);
return spu_extract(tmp, 0);
}
/**
* Get four texels from locations (x[0], y[0]), (x[1], y[1]) ...
*
* NOTE: in the typical case of bilinear filtering, the four texels
* are in a 2x2 group so we could get by with just two dcache fetches
* (two side-by-side texels per fetch). But when bilinear filtering
* wraps around a texture edge, we'll probably need code like we have
* now.
* FURTHERMORE: since we're rasterizing a quad of 2x2 pixels at a time,
* it's quite likely that the four pixels in a quad will need some of the
* same texels. So look into doing texture fetches for four pixels at
* a time.
*/
static void
get_four_texels(uint unit, vec_uint4 x, vec_uint4 y, vec_uint4 *texels)
{
const unsigned texture_ea = (uintptr_t) spu.texture[unit].start;
vec_uint4 tile_x = spu_rlmask(x, -5);
vec_uint4 tile_y = spu_rlmask(y, -5);
const qword offset_x = si_andi((qword) x, 0x1f);
const qword offset_y = si_andi((qword) y, 0x1f);
const qword tiles_per_row = (qword) spu_splats(spu.texture[unit].tiles_per_row);
const qword tile_size = (qword) spu_splats(sizeof(tile_t));
qword tile_offset = si_mpya((qword) tile_y, tiles_per_row, (qword) tile_x);
tile_offset = si_mpy((qword) tile_offset, tile_size);
qword texel_offset = si_a(si_mpyui(offset_y, 32), offset_x);
texel_offset = si_mpyui(texel_offset, 4);
vec_uint4 offset = (vec_uint4) si_a(tile_offset, texel_offset);
spu_dcache_fetch_unaligned((qword *) & texels[0],
texture_ea + spu_extract(offset, 0), 4);
spu_dcache_fetch_unaligned((qword *) & texels[1],
texture_ea + spu_extract(offset, 1), 4);
spu_dcache_fetch_unaligned((qword *) & texels[2],
texture_ea + spu_extract(offset, 2), 4);
spu_dcache_fetch_unaligned((qword *) & texels[3],
texture_ea + spu_extract(offset, 3), 4);
}
/**
* Get texture sample at texcoord.
*/
vector float
sample_texture_nearest(uint unit, vector float texcoord)
{
vector float tc = spu_mul(texcoord, spu.texture[unit].tex_size);
vector unsigned int itc = spu_convtu(tc, 0); /* convert to int */
itc = spu_and(itc, spu.texture[unit].tex_size_mask); /* mask (GL_REPEAT) */
uint texel = get_texel(unit, itc);
return spu_unpack_A8R8G8B8(texel);
}
vector float
sample_texture_bilinear(uint unit, vector float texcoord)
{
static const vec_uint4 offset_x = {0, 0, 1, 1};
static const vec_uint4 offset_y = {0, 1, 0, 1};
vector float tc = spu_mul(texcoord, spu.texture[unit].tex_size);
tc = spu_add(tc, spu_splats(-0.5f)); /* half texel bias */
/* integer texcoords S,T: */
vec_uint4 itc = spu_convtu(tc, 0); /* convert to int */
vec_uint4 texels[4];
/* setup texcoords for quad:
* +-----+-----+
* |x0,y0|x1,y1|
* +-----+-----+
* |x2,y2|x3,y3|
* +-----+-----+
*/
vec_uint4 x = spu_splats(spu_extract(itc, 0));
vec_uint4 y = spu_splats(spu_extract(itc, 1));
x = spu_add(x, offset_x);
y = spu_add(y, offset_y);
/* GL_REPEAT wrap mode: */
x = spu_and(x, spu.texture[unit].tex_size_x_mask);
y = spu_and(y, spu.texture[unit].tex_size_y_mask);
get_four_texels(unit, x, y, texels);
/* integer A8R8G8B8 to float texel conversion */
vector float texel00 = spu_unpack_A8R8G8B8(spu_extract(texels[0], 0));
vector float texel01 = spu_unpack_A8R8G8B8(spu_extract(texels[1], 0));
vector float texel10 = spu_unpack_A8R8G8B8(spu_extract(texels[2], 0));
vector float texel11 = spu_unpack_A8R8G8B8(spu_extract(texels[3], 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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