src/gallium/drivers/swr/rasterizer/core/state_funcs.h

/****************************************************************************
* Copyright (C) 2014-2015 Intel Corporation.   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
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* 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.
*
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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*
* @file state.h
*
* @brief Definitions for API state - complex function implementation.
*
******************************************************************************/
#pragma once

#include "core/state.h"
#include "common/simdintrin.h"


template <typename MaskT>
INLINE __m128i SWR_MULTISAMPLE_POS::expandThenBlend4(uint32_t* min, uint32_t* max)
{
    __m128i vMin = _mm_set1_epi32(*min);
    __m128i vMax = _mm_set1_epi32(*max);
    return _simd_blend4_epi32<MaskT::value>(vMin, vMax);
}

INLINE void SWR_MULTISAMPLE_POS::PrecalcSampleData(int numSamples)
{
    for(int i = 0; i < numSamples; i++)
    {
        _vXi[i] = _mm_set1_epi32(_xi[i]);
        _vYi[i] = _mm_set1_epi32(_yi[i]);
        _vX[i] = _simd_set1_ps(_x[i]);
        _vY[i] = _simd_set1_ps(_y[i]);
    }
    // precalculate the raster tile BB for the rasterizer.
    CalcTileSampleOffsets(numSamples);                                 
}

INLINE void SWR_MULTISAMPLE_POS::CalcTileSampleOffsets(int numSamples)
{
    auto minXi = std::min_element(std::begin(_xi), &_xi[numSamples]);
    auto maxXi = std::max_element(std::begin(_xi), &_xi[numSamples]);
    using xMask = std::integral_constant<int, 0xA>;
    // BR(max),    BL(min),    UR(max),    UL(min)
    tileSampleOffsetsX = expandThenBlend4<xMask>(minXi, maxXi);

    auto minYi = std::min_element(std::begin(_yi), &_yi[numSamples]);
    auto maxYi = std::max_element(std::begin(_yi), &_yi[numSamples]);
    using yMask = std::integral_constant<int, 0xC>;
    // BR(max),    BL(min),    UR(max),    UL(min)
    tileSampleOffsetsY = expandThenBlend4<yMask>(minYi, maxYi);
};