Scatter.cpp

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 * Copyright (C) 2014-2015 Intel Corporation.   All Rights Reserved.
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 *
 * @file Scatter.cpp
 *
 * @brief Shader support library implementation for scatter emulation
 *
 * Notes:
 *
 ******************************************************************************/
#include <stdarg.h>
#include "common/os.h"
#include "common/simdlib.hpp"

extern "C" void ScatterPS_256(uint8_t* pBase, SIMD256::Integer vIndices, SIMD256::Float vSrc, uint8_t mask, uint32_t scale)
{
    OSALIGN(float, 32) src[8];
    OSALIGN(uint32_t, 32) indices[8];

    SIMD256::store_ps(src, vSrc);
    SIMD256::store_si((SIMD256::Integer*)indices, vIndices);

    unsigned long index;
    while (_BitScanForward(&index, mask))
    {
        mask &= ~(1 << index);

        *(float*)(pBase + indices[index] * scale) = src[index];
    }
}