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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 "spu_main.h"
#include "spu_blend.h"
#include "spu_colorpack.h"
void
blend_quad(uint itx, uint ity, vector float colors[4])
{
/* simple SRC_ALPHA, ONE_MINUS_SRC_ALPHA blending */
vector float fbc00 = spu_unpack_color(spu.ctile.ui[ity][itx]);
vector float fbc01 = spu_unpack_color(spu.ctile.ui[ity][itx+1]);
vector float fbc10 = spu_unpack_color(spu.ctile.ui[ity+1][itx]);
vector float fbc11 = spu_unpack_color(spu.ctile.ui[ity+1][itx+1]);
vector float alpha00 = spu_splats(spu_extract(colors[0], 3));
vector float alpha01 = spu_splats(spu_extract(colors[1], 3));
vector float alpha10 = spu_splats(spu_extract(colors[2], 3));
vector float alpha11 = spu_splats(spu_extract(colors[3], 3));
vector float one_minus_alpha00 = spu_sub(spu_splats(1.0f), alpha00);
vector float one_minus_alpha01 = spu_sub(spu_splats(1.0f), alpha01);
vector float one_minus_alpha10 = spu_sub(spu_splats(1.0f), alpha10);
vector float one_minus_alpha11 = spu_sub(spu_splats(1.0f), alpha11);
colors[0] = spu_add(spu_mul(colors[0], alpha00),
spu_mul(fbc00, one_minus_alpha00));
colors[1] = spu_add(spu_mul(colors[1], alpha01),
spu_mul(fbc01, one_minus_alpha01));
colors[2] = spu_add(spu_mul(colors[2], alpha10),
spu_mul(fbc10, one_minus_alpha10));
colors[3] = spu_add(spu_mul(colors[3], alpha11),
spu_mul(fbc11, one_minus_alpha11));
}
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