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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.
*
**************************************************************************/
/**
* SPU functions accessed by shaders.
*
* Authors: Brian Paul
*/
#include <string.h>
#include <libmisc.h>
#include <math.h>
#include <cos14_v.h>
#include <sin14_v.h>
#include <transpose_matrix4x4.h>
#include "cell/common.h"
#include "spu_main.h"
#include "spu_funcs.h"
/** For "return"-ing four vectors */
struct vec_4x4
{
vector float v[4];
};
static vector float
spu_cos(vector float x)
{
return _cos14_v(x);
}
static vector float
spu_sin(vector float x)
{
return _sin14_v(x);
}
static vector float
spu_pow(vector float x, vector float y)
{
float z0 = powf(spu_extract(x,0), spu_extract(y,0));
float z1 = powf(spu_extract(x,1), spu_extract(y,1));
float z2 = powf(spu_extract(x,2), spu_extract(y,2));
float z3 = powf(spu_extract(x,3), spu_extract(y,3));
return (vector float) {z0, z1, z2, z3};
}
static vector float
spu_exp2(vector float x)
{
float z0 = powf(2.0f, spu_extract(x,0));
float z1 = powf(2.0f, spu_extract(x,1));
float z2 = powf(2.0f, spu_extract(x,2));
float z3 = powf(2.0f, spu_extract(x,3));
return (vector float) {z0, z1, z2, z3};
}
static vector float
spu_log2(vector float x)
{
/*
* log_base_2(x) = log(x) / log(2)
* 1.442695 = 1/log(2).
*/
static const vector float k = {1.442695F, 1.442695F, 1.442695F, 1.442695F};
float z0 = logf(spu_extract(x,0));
float z1 = logf(spu_extract(x,1));
float z2 = logf(spu_extract(x,2));
float z3 = logf(spu_extract(x,3));
vector float v = (vector float) {z0, z1, z2, z3};
return spu_mul(v, k);
}
static struct vec_4x4
spu_txp(vector float s, vector float t, vector float r, vector float q)
{
const uint unit = 0;
struct vec_4x4 colors;
vector float coords[4];
coords[0] = s;
coords[1] = t;
coords[2] = r;
coords[3] = q;
_transpose_matrix4x4(coords, coords);
/* get four texture samples */
colors.v[0] = spu.sample_texture[unit](unit, coords[0]);
colors.v[1] = spu.sample_texture[unit](unit, coords[1]);
colors.v[2] = spu.sample_texture[unit](unit, coords[2]);
colors.v[3] = spu.sample_texture[unit](unit, coords[3]);
_transpose_matrix4x4(colors.v, colors.v);
return colors;
}
/**
* Add named function to list of "exported" functions that will be
* made available to the PPU-hosted code generator.
*/
static void
export_func(struct cell_spu_function_info *spu_functions,
const char *name, void *addr)
{
uint n = spu_functions->num;
ASSERT(strlen(name) < 16);
strcpy(spu_functions->names[n], name);
spu_functions->addrs[n] = (uint) addr;
spu_functions->num++;
ASSERT(spu_functions->num <= 16);
}
/**
* Return info about the SPU's function to the PPU / main memory.
* The PPU needs to know the address of some SPU-side functions so
* that we can generate shader code with function calls.
*/
void
return_function_info(void)
{
struct cell_spu_function_info funcs ALIGN16_ATTRIB;
int tag = TAG_MISC;
ASSERT(sizeof(funcs) == 256); /* must be multiple of 16 bytes */
funcs.num = 0;
export_func(&funcs, "spu_cos", &spu_cos);
export_func(&funcs, "spu_sin", &spu_sin);
export_func(&funcs, "spu_pow", &spu_pow);
export_func(&funcs, "spu_exp2", &spu_exp2);
export_func(&funcs, "spu_log2", &spu_log2);
export_func(&funcs, "spu_txp", &spu_txp);
/* Send the function info back to the PPU / main memory */
mfc_put((void *) &funcs, /* src in local store */
(unsigned int) spu.init.spu_functions, /* dst in main memory */
sizeof(funcs), /* bytes */
tag,
0, /* tid */
0 /* rid */);
wait_on_mask(1 << tag);
}
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