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/**************************************************************************
*
* Copyright 2010 VMware.
* 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 VMWARE 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.
*
**************************************************************************/
/*
* Binning code for triangles
*/
#include "util/u_math.h"
#include "util/u_memory.h"
#include "lp_perf.h"
#include "lp_setup_context.h"
#include "lp_setup_coef.h"
#include "lp_rast.h"
#if defined(PIPE_ARCH_SSE)
#include <emmintrin.h>
static void constant_coef4( struct lp_rast_shader_inputs *inputs,
const struct lp_tri_info *info,
unsigned slot,
const float *attr)
{
*(__m128 *)inputs->a0[slot] = *(__m128 *)attr;
*(__m128 *)inputs->dadx[slot] = _mm_set1_ps(0.0);
*(__m128 *)inputs->dady[slot] = _mm_set1_ps(0.0);
}
/**
* Setup the fragment input attribute with the front-facing value.
* \param frontface is the triangle front facing?
*/
static void setup_facing_coef( struct lp_rast_shader_inputs *inputs,
const struct lp_tri_info *info,
unsigned slot )
{
/* XXX: just pass frontface directly to the shader, don't bother
* treating it as an input.
*/
__m128 a0 = _mm_setr_ps(info->frontfacing ? 1.0 : -1.0,
0, 0, 0);
*(__m128 *)inputs->a0[slot] = a0;
*(__m128 *)inputs->dadx[slot] = _mm_set1_ps(0.0);
*(__m128 *)inputs->dady[slot] = _mm_set1_ps(0.0);
}
static void calc_coef4( struct lp_rast_shader_inputs *inputs,
const struct lp_tri_info *info,
unsigned slot,
__m128 a0,
__m128 a1,
__m128 a2)
{
__m128 da01 = _mm_sub_ps(a0, a1);
__m128 da20 = _mm_sub_ps(a2, a0);
__m128 da01_dy20_ooa = _mm_mul_ps(da01, _mm_set1_ps(info->dy20_ooa));
__m128 da20_dy01_ooa = _mm_mul_ps(da20, _mm_set1_ps(info->dy01_ooa));
__m128 dadx = _mm_sub_ps(da01_dy20_ooa, da20_dy01_ooa);
__m128 da01_dx20_ooa = _mm_mul_ps(da01, _mm_set1_ps(info->dx20_ooa));
__m128 da20_dx01_ooa = _mm_mul_ps(da20, _mm_set1_ps(info->dx01_ooa));
__m128 dady = _mm_sub_ps(da20_dx01_ooa, da01_dx20_ooa);
__m128 dadx_x0 = _mm_mul_ps(dadx, _mm_set1_ps(info->x0_center));
__m128 dady_y0 = _mm_mul_ps(dady, _mm_set1_ps(info->y0_center));
__m128 attr_v0 = _mm_add_ps(dadx_x0, dady_y0);
__m128 attr_0 = _mm_sub_ps(a0, attr_v0);
*(__m128 *)inputs->a0[slot] = attr_0;
*(__m128 *)inputs->dadx[slot] = dadx;
*(__m128 *)inputs->dady[slot] = dady;
}
static void linear_coef( struct lp_rast_shader_inputs *inputs,
const struct lp_tri_info *info,
unsigned slot,
unsigned vert_attr)
{
__m128 a0 = *(const __m128 *)info->v0[vert_attr];
__m128 a1 = *(const __m128 *)info->v1[vert_attr];
__m128 a2 = *(const __m128 *)info->v2[vert_attr];
calc_coef4(inputs, info, slot, a0, a1, a2);
}
/**
* Compute a0, dadx and dady for a perspective-corrected interpolant,
* for a triangle.
* We basically multiply the vertex value by 1/w before computing
* the plane coefficients (a0, dadx, dady).
* Later, when we compute the value at a particular fragment position we'll
* divide the interpolated value by the interpolated W at that fragment.
*/
static void perspective_coef( struct lp_rast_shader_inputs *inputs,
const struct lp_tri_info *info,
unsigned slot,
unsigned vert_attr)
{
/* premultiply by 1/w (v[0][3] is always 1/w):
*/
__m128 a0 = *(const __m128 *)info->v0[vert_attr];
__m128 a1 = *(const __m128 *)info->v1[vert_attr];
__m128 a2 = *(const __m128 *)info->v2[vert_attr];
__m128 a0_oow = _mm_mul_ps(a0, _mm_set1_ps(info->v0[0][3]));
__m128 a1_oow = _mm_mul_ps(a1, _mm_set1_ps(info->v1[0][3]));
__m128 a2_oow = _mm_mul_ps(a2, _mm_set1_ps(info->v2[0][3]));
calc_coef4(inputs, info, slot, a0_oow, a1_oow, a2_oow);
}
/**
* Compute the inputs-> dadx, dady, a0 values.
*/
void lp_setup_tri_coef( struct lp_setup_context *setup,
struct lp_rast_shader_inputs *inputs,
const float (*v0)[4],
const float (*v1)[4],
const float (*v2)[4],
boolean frontfacing)
{
unsigned slot;
struct lp_tri_info info;
float dx01 = v0[0][0] - v1[0][0];
float dy01 = v0[0][1] - v1[0][1];
float dx20 = v2[0][0] - v0[0][0];
float dy20 = v2[0][1] - v0[0][1];
float oneoverarea = 1.0f / (dx01 * dy20 - dx20 * dy01);
info.v0 = v0;
info.v1 = v1;
info.v2 = v2;
info.frontfacing = frontfacing;
info.x0_center = v0[0][0] - setup->pixel_offset;
info.y0_center = v0[0][1] - setup->pixel_offset;
info.dx01_ooa = dx01 * oneoverarea;
info.dx20_ooa = dx20 * oneoverarea;
info.dy01_ooa = dy01 * oneoverarea;
info.dy20_ooa = dy20 * oneoverarea;
/* The internal position input is in slot zero:
*/
linear_coef(inputs, &info, 0, 0);
/* setup interpolation for all the remaining attributes:
*/
for (slot = 0; slot < setup->fs.nr_inputs; slot++) {
unsigned vert_attr = setup->fs.input[slot].src_index;
switch (setup->fs.input[slot].interp) {
case LP_INTERP_CONSTANT:
if (setup->flatshade_first) {
constant_coef4(inputs, &info, slot+1, info.v0[vert_attr]);
}
else {
constant_coef4(inputs, &info, slot+1, info.v2[vert_attr]);
}
break;
case LP_INTERP_LINEAR:
linear_coef(inputs, &info, slot+1, vert_attr);
break;
case LP_INTERP_PERSPECTIVE:
perspective_coef(inputs, &info, slot+1, vert_attr);
break;
case LP_INTERP_POSITION:
/*
* The generated pixel interpolators will pick up the coeffs from
* slot 0.
*/
break;
case LP_INTERP_FACING:
setup_facing_coef(inputs, &info, slot+1);
break;
default:
assert(0);
}
}
}
#else
extern void lp_setup_coef_dummy(void);
void lp_setup_coef_dummy(void)
{
}
#endif
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