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ProcessRGB.cpp
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ProcessRGB.cpp
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#include <array>
#include <string.h>
#include <limits>
#ifdef __ARM_NEON
# include <arm_neon.h>
#endif
#include "Dither.hpp"
#include "ForceInline.hpp"
#include "Math.hpp"
#include "ProcessCommon.hpp"
#include "ProcessRGB.hpp"
#include "Tables.hpp"
#include "Vector.hpp"
#if defined __SSE4_1__ || defined __AVX2__ || defined _MSC_VER
# ifdef _MSC_VER
# include <intrin.h>
# include <Windows.h>
# define _bswap(x) _byteswap_ulong(x)
# define _bswap64(x) _byteswap_uint64(x)
# else
# include <x86intrin.h>
# endif
#endif
#ifndef _bswap
# define _bswap(x) __builtin_bswap32(x)
# define _bswap64(x) __builtin_bswap64(x)
#endif
static const uint32_t MaxError = 1065369600; // ((38+76+14) * 255)^2
// common T-/H-mode table
static uint8_t tableTH[8] = { 3, 6, 11, 16, 23, 32, 41, 64 };
// thresholds for the early compression-mode decision scheme
// default: 0.03, 0.09, and 0.38
float ecmd_threshold[3] = { 0.03f, 0.09f, 0.38f };
static const uint8_t ModeUndecided = 0;
static const uint8_t ModePlanar = 0x1;
static const uint8_t ModeTH = 0x2;
const unsigned int R = 2;
const unsigned int G = 1;
const unsigned int B = 0;
struct Luma
{
#ifdef __AVX2__
float max, min;
uint8_t minIdx = 255, maxIdx = 255;
__m128i luma8;
#elif defined __ARM_NEON && defined __aarch64__
float max, min;
uint8_t minIdx = 255, maxIdx = 255;
uint8x16_t luma8;
#else
uint8_t max = 0, min = 255, maxIdx = 0, minIdx = 0;
uint8_t val[16];
#endif
};
#ifdef __AVX2__
struct Plane
{
uint64_t plane;
uint64_t error;
__m256i sum4;
};
#endif
#if defined __AVX2__ || (defined __ARM_NEON && defined __aarch64__)
struct Channels
{
#ifdef __AVX2__
__m128i r8, g8, b8;
#elif defined __ARM_NEON && defined __aarch64__
uint8x16x2_t r, g, b;
#endif
};
#endif
namespace
{
static etcpak_force_inline uint8_t clamp( uint8_t min, int16_t val, uint8_t max )
{
return val < min ? min : ( val > max ? max : val );
}
static etcpak_force_inline uint8_t clampMin( uint8_t min, int16_t val )
{
return val < min ? min : val;
}
static etcpak_force_inline uint8_t clampMax( int16_t val, uint8_t max )
{
return val > max ? max : val;
}
// slightly faster than std::sort
static void insertionSort( uint8_t* arr1, uint8_t* arr2 )
{
for( uint8_t i = 1; i < 16; ++i )
{
uint8_t value = arr1[i];
uint8_t hole = i;
for( ; hole > 0 && value < arr1[hole - 1]; --hole )
{
arr1[hole] = arr1[hole - 1];
arr2[hole] = arr2[hole - 1];
}
arr1[hole] = value;
arr2[hole] = i;
}
}
//converts indices from |a0|a1|e0|e1|i0|i1|m0|m1|b0|b1|f0|f1|j0|j1|n0|n1|c0|c1|g0|g1|k0|k1|o0|o1|d0|d1|h0|h1|l0|l1|p0|p1| previously used by T- and H-modes
// into |p0|o0|n0|m0|l0|k0|j0|i0|h0|g0|f0|e0|d0|c0|b0|a0|p1|o1|n1|m1|l1|k1|j1|i1|h1|g1|f1|e1|d1|c1|b1|a1| which should be used for all modes.
// NO WARRANTY --- SEE STATEMENT IN TOP OF FILE (C) Ericsson AB 2005-2013. All Rights Reserved.
static etcpak_force_inline int indexConversion( int pixelIndices )
{
int correctIndices = 0;
int LSB[4][4];
int MSB[4][4];
int shift = 0;
for( int y = 3; y >= 0; y-- )
{
for( int x = 3; x >= 0; x-- )
{
LSB[x][y] = ( pixelIndices >> shift ) & 1;
shift++;
MSB[x][y] = ( pixelIndices >> shift ) & 1;
shift++;
}
}
shift = 0;
for( int x = 0; x < 4; x++ )
{
for( int y = 0; y < 4; y++ )
{
correctIndices |= ( LSB[x][y] << shift );
correctIndices |= ( MSB[x][y] << ( 16 + shift ) );
shift++;
}
}
return correctIndices;
}
// Swapping two RGB-colors
// NO WARRANTY --- SEE STATEMENT IN TOP OF FILE (C) Ericsson AB 2005-2013. All Rights Reserved.
static etcpak_force_inline void swapColors( uint8_t( colors )[2][3] )
{
uint8_t temp = colors[0][R];
colors[0][R] = colors[1][R];
colors[1][R] = temp;
temp = colors[0][G];
colors[0][G] = colors[1][G];
colors[1][G] = temp;
temp = colors[0][B];
colors[0][B] = colors[1][B];
colors[1][B] = temp;
}
// calculates quantized colors for T or H modes
void compressColor( uint8_t( currColor )[2][3], uint8_t( quantColor )[2][3], bool t_mode )
{
if( t_mode )
{
quantColor[0][R] = clampMax( 15 * ( currColor[0][R] + 8 ) / 255, 15 );
quantColor[0][G] = clampMax( 15 * ( currColor[0][G] + 8 ) / 255, 15 );
quantColor[0][B] = clampMax( 15 * ( currColor[0][B] + 8 ) / 255, 15 );
}
else // clamped to [1,14] to get a wider range
{
quantColor[0][R] = clamp( 1, 15 * ( currColor[0][R] + 8 ) / 255, 14 );
quantColor[0][G] = clamp( 1, 15 * ( currColor[0][G] + 8 ) / 255, 14 );
quantColor[0][B] = clamp( 1, 15 * ( currColor[0][B] + 8 ) / 255, 14 );
}
// clamped to [1,14] to get a wider range
quantColor[1][R] = clamp( 1, 15 * ( currColor[1][R] + 8 ) / 255, 14 );
quantColor[1][G] = clamp( 1, 15 * ( currColor[1][G] + 8 ) / 255, 14 );
quantColor[1][B] = clamp( 1, 15 * ( currColor[1][B] + 8 ) / 255, 14 );
}
// three decoding functions come from ETCPACK v2.74 and are slightly changed.
static etcpak_force_inline void decompressColor( uint8_t( colorsRGB444 )[2][3], uint8_t( colors )[2][3] )
{
// The color should be retrieved as:
//
// c = round(255/(r_bits^2-1))*comp_color
//
// This is similar to bit replication
//
// Note -- this code only work for bit replication from 4 bits and up --- 3 bits needs
// two copy operations.
colors[0][R] = ( colorsRGB444[0][R] << 4 ) | colorsRGB444[0][R];
colors[0][G] = ( colorsRGB444[0][G] << 4 ) | colorsRGB444[0][G];
colors[0][B] = ( colorsRGB444[0][B] << 4 ) | colorsRGB444[0][B];
colors[1][R] = ( colorsRGB444[1][R] << 4 ) | colorsRGB444[1][R];
colors[1][G] = ( colorsRGB444[1][G] << 4 ) | colorsRGB444[1][G];
colors[1][B] = ( colorsRGB444[1][B] << 4 ) | colorsRGB444[1][B];
}
// calculates the paint colors from the block colors
// using a distance d and one of the H- or T-patterns.
static void calculatePaintColors59T( uint8_t d, uint8_t( colors )[2][3], uint8_t( pColors )[4][3] )
{
//////////////////////////////////////////////
//
// C3 C1 C4----C1---C2
// | | |
// | | |
// |-------| |
// | | |
// | | |
// C4 C2 C3
//
//////////////////////////////////////////////
// C4
pColors[3][R] = clampMin( 0, colors[1][R] - tableTH[d] );
pColors[3][G] = clampMin( 0, colors[1][G] - tableTH[d] );
pColors[3][B] = clampMin( 0, colors[1][B] - tableTH[d] );
// C3
pColors[0][R] = colors[0][R];
pColors[0][G] = colors[0][G];
pColors[0][B] = colors[0][B];
// C2
pColors[1][R] = clampMax( colors[1][R] + tableTH[d], 255 );
pColors[1][G] = clampMax( colors[1][G] + tableTH[d], 255 );
pColors[1][B] = clampMax( colors[1][B] + tableTH[d], 255 );
// C1
pColors[2][R] = colors[1][R];
pColors[2][G] = colors[1][G];
pColors[2][B] = colors[1][B];
}
static void calculatePaintColors58H( uint8_t d, uint8_t( colors )[2][3], uint8_t( pColors )[4][3] )
{
pColors[3][R] = clampMin( 0, colors[1][R] - tableTH[d] );
pColors[3][G] = clampMin( 0, colors[1][G] - tableTH[d] );
pColors[3][B] = clampMin( 0, colors[1][B] - tableTH[d] );
// C1
pColors[0][R] = clampMax( colors[0][R] + tableTH[d], 255 );
pColors[0][G] = clampMax( colors[0][G] + tableTH[d], 255 );
pColors[0][B] = clampMax( colors[0][B] + tableTH[d], 255 );
// C2
pColors[1][R] = clampMin( 0, colors[0][R] - tableTH[d] );
pColors[1][G] = clampMin( 0, colors[0][G] - tableTH[d] );
pColors[1][B] = clampMin( 0, colors[0][B] - tableTH[d] );
// C3
pColors[2][R] = clampMax( colors[1][R] + tableTH[d], 255 );
pColors[2][G] = clampMax( colors[1][G] + tableTH[d], 255 );
pColors[2][B] = clampMax( colors[1][B] + tableTH[d], 255 );
}
#if defined _MSC_VER && !defined __clang__
static etcpak_force_inline unsigned long _bit_scan_forward( unsigned long mask )
{
unsigned long ret;
_BitScanForward( &ret, mask );
return ret;
}
#endif
typedef std::array<uint16_t, 4> v4i;
#ifdef __AVX2__
static etcpak_force_inline __m256i Sum4_AVX2( const uint8_t* data) noexcept
{
__m128i d0 = _mm_loadu_si128(((__m128i*)data) + 0);
__m128i d1 = _mm_loadu_si128(((__m128i*)data) + 1);
__m128i d2 = _mm_loadu_si128(((__m128i*)data) + 2);
__m128i d3 = _mm_loadu_si128(((__m128i*)data) + 3);
__m128i dm0 = _mm_and_si128(d0, _mm_set1_epi32(0x00FFFFFF));
__m128i dm1 = _mm_and_si128(d1, _mm_set1_epi32(0x00FFFFFF));
__m128i dm2 = _mm_and_si128(d2, _mm_set1_epi32(0x00FFFFFF));
__m128i dm3 = _mm_and_si128(d3, _mm_set1_epi32(0x00FFFFFF));
__m256i t0 = _mm256_cvtepu8_epi16(dm0);
__m256i t1 = _mm256_cvtepu8_epi16(dm1);
__m256i t2 = _mm256_cvtepu8_epi16(dm2);
__m256i t3 = _mm256_cvtepu8_epi16(dm3);
__m256i sum0 = _mm256_add_epi16(t0, t1);
__m256i sum1 = _mm256_add_epi16(t2, t3);
__m256i s0 = _mm256_permute2x128_si256(sum0, sum1, (0) | (3 << 4)); // 0, 0, 3, 3
__m256i s1 = _mm256_permute2x128_si256(sum0, sum1, (1) | (2 << 4)); // 1, 1, 2, 2
__m256i s2 = _mm256_permute4x64_epi64(s0, _MM_SHUFFLE(1, 3, 0, 2));
__m256i s3 = _mm256_permute4x64_epi64(s0, _MM_SHUFFLE(0, 2, 1, 3));
__m256i s4 = _mm256_permute4x64_epi64(s1, _MM_SHUFFLE(3, 1, 0, 2));
__m256i s5 = _mm256_permute4x64_epi64(s1, _MM_SHUFFLE(2, 0, 1, 3));
__m256i sum5 = _mm256_add_epi16(s2, s3); // 3, 0, 3, 0
__m256i sum6 = _mm256_add_epi16(s4, s5); // 2, 1, 1, 2
return _mm256_add_epi16(sum5, sum6); // 3+2, 0+1, 3+1, 3+2
}
static etcpak_force_inline __m256i Average_AVX2( const __m256i data) noexcept
{
__m256i a = _mm256_add_epi16(data, _mm256_set1_epi16(4));
return _mm256_srli_epi16(a, 3);
}
static etcpak_force_inline __m128i CalcErrorBlock_AVX2( const __m256i data, const v4i a[8]) noexcept
{
//
__m256i a0 = _mm256_load_si256((__m256i*)a[0].data());
__m256i a1 = _mm256_load_si256((__m256i*)a[4].data());
// err = 8 * ( sq( average[0] ) + sq( average[1] ) + sq( average[2] ) );
__m256i a4 = _mm256_madd_epi16(a0, a0);
__m256i a5 = _mm256_madd_epi16(a1, a1);
__m256i a6 = _mm256_hadd_epi32(a4, a5);
__m256i a7 = _mm256_slli_epi32(a6, 3);
__m256i a8 = _mm256_add_epi32(a7, _mm256_set1_epi32(0x3FFFFFFF)); // Big value to prevent negative values, but small enough to prevent overflow
// average is not swapped
// err -= block[0] * 2 * average[0];
// err -= block[1] * 2 * average[1];
// err -= block[2] * 2 * average[2];
__m256i a2 = _mm256_slli_epi16(a0, 1);
__m256i a3 = _mm256_slli_epi16(a1, 1);
__m256i b0 = _mm256_madd_epi16(a2, data);
__m256i b1 = _mm256_madd_epi16(a3, data);
__m256i b2 = _mm256_hadd_epi32(b0, b1);
__m256i b3 = _mm256_sub_epi32(a8, b2);
__m256i b4 = _mm256_hadd_epi32(b3, b3);
__m256i b5 = _mm256_permutevar8x32_epi32(b4, _mm256_set_epi32(0, 0, 0, 0, 5, 1, 4, 0));
return _mm256_castsi256_si128(b5);
}
static etcpak_force_inline void ProcessAverages_AVX2(const __m256i d, v4i a[8] ) noexcept
{
__m256i t = _mm256_add_epi16(_mm256_mullo_epi16(d, _mm256_set1_epi16(31)), _mm256_set1_epi16(128));
__m256i c = _mm256_srli_epi16(_mm256_add_epi16(t, _mm256_srli_epi16(t, 8)), 8);
__m256i c1 = _mm256_shuffle_epi32(c, _MM_SHUFFLE(3, 2, 3, 2));
__m256i diff = _mm256_sub_epi16(c, c1);
diff = _mm256_max_epi16(diff, _mm256_set1_epi16(-4));
diff = _mm256_min_epi16(diff, _mm256_set1_epi16(3));
__m256i co = _mm256_add_epi16(c1, diff);
c = _mm256_blend_epi16(co, c, 0xF0);
__m256i a0 = _mm256_or_si256(_mm256_slli_epi16(c, 3), _mm256_srli_epi16(c, 2));
_mm256_store_si256((__m256i*)a[4].data(), a0);
__m256i t0 = _mm256_add_epi16(_mm256_mullo_epi16(d, _mm256_set1_epi16(15)), _mm256_set1_epi16(128));
__m256i t1 = _mm256_srli_epi16(_mm256_add_epi16(t0, _mm256_srli_epi16(t0, 8)), 8);
__m256i t2 = _mm256_or_si256(t1, _mm256_slli_epi16(t1, 4));
_mm256_store_si256((__m256i*)a[0].data(), t2);
}
static etcpak_force_inline uint64_t EncodeAverages_AVX2( const v4i a[8], size_t idx ) noexcept
{
uint64_t d = ( idx << 24 );
size_t base = idx << 1;
__m128i a0 = _mm_load_si128((const __m128i*)a[base].data());
__m128i r0, r1;
if( ( idx & 0x2 ) == 0 )
{
r0 = _mm_srli_epi16(a0, 4);
__m128i a1 = _mm_unpackhi_epi64(r0, r0);
r1 = _mm_slli_epi16(a1, 4);
}
else
{
__m128i a1 = _mm_and_si128(a0, _mm_set1_epi16(-8));
r0 = _mm_unpackhi_epi64(a1, a1);
__m128i a2 = _mm_sub_epi16(a1, r0);
__m128i a3 = _mm_srai_epi16(a2, 3);
r1 = _mm_and_si128(a3, _mm_set1_epi16(0x07));
}
__m128i r2 = _mm_or_si128(r0, r1);
// do missing swap for average values
__m128i r3 = _mm_shufflelo_epi16(r2, _MM_SHUFFLE(3, 0, 1, 2));
__m128i r4 = _mm_packus_epi16(r3, _mm_setzero_si128());
d |= _mm_cvtsi128_si32(r4);
return d;
}
static etcpak_force_inline uint64_t CheckSolid_AVX2( const uint8_t* src ) noexcept
{
__m256i d0 = _mm256_loadu_si256(((__m256i*)src) + 0);
__m256i d1 = _mm256_loadu_si256(((__m256i*)src) + 1);
__m256i c = _mm256_broadcastd_epi32(_mm256_castsi256_si128(d0));
__m256i c0 = _mm256_cmpeq_epi8(d0, c);
__m256i c1 = _mm256_cmpeq_epi8(d1, c);
__m256i m = _mm256_and_si256(c0, c1);
if (!_mm256_testc_si256(m, _mm256_set1_epi32(-1)))
{
return 0;
}
return 0x02000000 |
( (unsigned int)( src[0] & 0xF8 ) << 16 ) |
( (unsigned int)( src[1] & 0xF8 ) << 8 ) |
( (unsigned int)( src[2] & 0xF8 ) );
}
static etcpak_force_inline __m128i PrepareAverages_AVX2( v4i a[8], const uint8_t* src) noexcept
{
__m256i sum4 = Sum4_AVX2( src );
ProcessAverages_AVX2(Average_AVX2( sum4 ), a );
return CalcErrorBlock_AVX2( sum4, a);
}
static etcpak_force_inline __m128i PrepareAverages_AVX2( v4i a[8], const __m256i sum4) noexcept
{
ProcessAverages_AVX2(Average_AVX2( sum4 ), a );
return CalcErrorBlock_AVX2( sum4, a);
}
static etcpak_force_inline void FindBestFit_4x2_AVX2( uint32_t terr[2][8], uint32_t tsel[8], v4i a[8], const uint32_t offset, const uint8_t* data) noexcept
{
__m256i sel0 = _mm256_setzero_si256();
__m256i sel1 = _mm256_setzero_si256();
for (unsigned int j = 0; j < 2; ++j)
{
unsigned int bid = offset + 1 - j;
__m256i squareErrorSum = _mm256_setzero_si256();
__m128i a0 = _mm_loadl_epi64((const __m128i*)a[bid].data());
__m256i a1 = _mm256_broadcastq_epi64(a0);
// Processing one full row each iteration
for (size_t i = 0; i < 8; i += 4)
{
__m128i rgb = _mm_loadu_si128((const __m128i*)(data + i * 4));
__m256i rgb16 = _mm256_cvtepu8_epi16(rgb);
__m256i d = _mm256_sub_epi16(a1, rgb16);
// The scaling values are divided by two and rounded, to allow the differences to be in the range of signed int16
// This produces slightly different results, but is significant faster
__m256i pixel0 = _mm256_madd_epi16(d, _mm256_set_epi16(0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14));
__m256i pixel1 = _mm256_packs_epi32(pixel0, pixel0);
__m256i pixel2 = _mm256_hadd_epi16(pixel1, pixel1);
__m128i pixel3 = _mm256_castsi256_si128(pixel2);
__m128i pix0 = _mm_broadcastw_epi16(pixel3);
__m128i pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
__m256i pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing first two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
// This produces slightly different results, but is significant faster
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum = _mm256_add_epi32(squareErrorSum, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64_si128(i + j * 8));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64_si128(i + j * 8));
sel0 = _mm256_or_si256(sel0, minIndexLo2);
sel1 = _mm256_or_si256(sel1, minIndexHi2);
}
pixel3 = _mm256_extracti128_si256(pixel2, 1);
pix0 = _mm_broadcastw_epi16(pixel3);
pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing second two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum = _mm256_add_epi32(squareErrorSum, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64_si128(i + j * 8));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64_si128(i + j * 8));
__m256i minIndexLo3 = _mm256_slli_epi16(minIndexLo2, 2);
__m256i minIndexHi3 = _mm256_slli_epi16(minIndexHi2, 2);
sel0 = _mm256_or_si256(sel0, minIndexLo3);
sel1 = _mm256_or_si256(sel1, minIndexHi3);
}
}
data += 8 * 4;
_mm256_store_si256((__m256i*)terr[1 - j], squareErrorSum);
}
// Interleave selector bits
__m256i minIndexLo0 = _mm256_unpacklo_epi16(sel0, sel1);
__m256i minIndexHi0 = _mm256_unpackhi_epi16(sel0, sel1);
__m256i minIndexLo1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (0) | (2 << 4));
__m256i minIndexHi1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (1) | (3 << 4));
__m256i minIndexHi2 = _mm256_slli_epi32(minIndexHi1, 1);
__m256i sel = _mm256_or_si256(minIndexLo1, minIndexHi2);
_mm256_store_si256((__m256i*)tsel, sel);
}
static etcpak_force_inline void FindBestFit_2x4_AVX2( uint32_t terr[2][8], uint32_t tsel[8], v4i a[8], const uint32_t offset, const uint8_t* data) noexcept
{
__m256i sel0 = _mm256_setzero_si256();
__m256i sel1 = _mm256_setzero_si256();
__m256i squareErrorSum0 = _mm256_setzero_si256();
__m256i squareErrorSum1 = _mm256_setzero_si256();
__m128i a0 = _mm_loadl_epi64((const __m128i*)a[offset + 1].data());
__m128i a1 = _mm_loadl_epi64((const __m128i*)a[offset + 0].data());
__m128i a2 = _mm_broadcastq_epi64(a0);
__m128i a3 = _mm_broadcastq_epi64(a1);
__m256i a4 = _mm256_insertf128_si256(_mm256_castsi128_si256(a2), a3, 1);
// Processing one full row each iteration
for (size_t i = 0; i < 16; i += 4)
{
__m128i rgb = _mm_loadu_si128((const __m128i*)(data + i * 4));
__m256i rgb16 = _mm256_cvtepu8_epi16(rgb);
__m256i d = _mm256_sub_epi16(a4, rgb16);
// The scaling values are divided by two and rounded, to allow the differences to be in the range of signed int16
// This produces slightly different results, but is significant faster
__m256i pixel0 = _mm256_madd_epi16(d, _mm256_set_epi16(0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14));
__m256i pixel1 = _mm256_packs_epi32(pixel0, pixel0);
__m256i pixel2 = _mm256_hadd_epi16(pixel1, pixel1);
__m128i pixel3 = _mm256_castsi256_si128(pixel2);
__m128i pix0 = _mm_broadcastw_epi16(pixel3);
__m128i pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
__m256i pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing first two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum0 = _mm256_add_epi32(squareErrorSum0, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64_si128(i));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64_si128(i));
sel0 = _mm256_or_si256(sel0, minIndexLo2);
sel1 = _mm256_or_si256(sel1, minIndexHi2);
}
pixel3 = _mm256_extracti128_si256(pixel2, 1);
pix0 = _mm_broadcastw_epi16(pixel3);
pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing second two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum1 = _mm256_add_epi32(squareErrorSum1, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64_si128(i));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64_si128(i));
__m256i minIndexLo3 = _mm256_slli_epi16(minIndexLo2, 2);
__m256i minIndexHi3 = _mm256_slli_epi16(minIndexHi2, 2);
sel0 = _mm256_or_si256(sel0, minIndexLo3);
sel1 = _mm256_or_si256(sel1, minIndexHi3);
}
}
_mm256_store_si256((__m256i*)terr[1], squareErrorSum0);
_mm256_store_si256((__m256i*)terr[0], squareErrorSum1);
// Interleave selector bits
__m256i minIndexLo0 = _mm256_unpacklo_epi16(sel0, sel1);
__m256i minIndexHi0 = _mm256_unpackhi_epi16(sel0, sel1);
__m256i minIndexLo1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (0) | (2 << 4));
__m256i minIndexHi1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (1) | (3 << 4));
__m256i minIndexHi2 = _mm256_slli_epi32(minIndexHi1, 1);
__m256i sel = _mm256_or_si256(minIndexLo1, minIndexHi2);
_mm256_store_si256((__m256i*)tsel, sel);
}
static etcpak_force_inline uint64_t EncodeSelectors_AVX2( uint64_t d, const uint32_t terr[2][8], const uint32_t tsel[8], const bool rotate) noexcept
{
size_t tidx[2];
// Get index of minimum error (terr[0] and terr[1])
__m256i err0 = _mm256_load_si256((const __m256i*)terr[0]);
__m256i err1 = _mm256_load_si256((const __m256i*)terr[1]);
__m256i errLo = _mm256_permute2x128_si256(err0, err1, (0) | (2 << 4));
__m256i errHi = _mm256_permute2x128_si256(err0, err1, (1) | (3 << 4));
__m256i errMin0 = _mm256_min_epu32(errLo, errHi);
__m256i errMin1 = _mm256_shuffle_epi32(errMin0, _MM_SHUFFLE(2, 3, 0, 1));
__m256i errMin2 = _mm256_min_epu32(errMin0, errMin1);
__m256i errMin3 = _mm256_shuffle_epi32(errMin2, _MM_SHUFFLE(1, 0, 3, 2));
__m256i errMin4 = _mm256_min_epu32(errMin3, errMin2);
__m256i errMin5 = _mm256_permute2x128_si256(errMin4, errMin4, (0) | (0 << 4));
__m256i errMin6 = _mm256_permute2x128_si256(errMin4, errMin4, (1) | (1 << 4));
__m256i errMask0 = _mm256_cmpeq_epi32(errMin5, err0);
__m256i errMask1 = _mm256_cmpeq_epi32(errMin6, err1);
uint32_t mask0 = _mm256_movemask_epi8(errMask0);
uint32_t mask1 = _mm256_movemask_epi8(errMask1);
tidx[0] = _bit_scan_forward(mask0) >> 2;
tidx[1] = _bit_scan_forward(mask1) >> 2;
d |= tidx[0] << 26;
d |= tidx[1] << 29;
unsigned int t0 = tsel[tidx[0]];
unsigned int t1 = tsel[tidx[1]];
if (!rotate)
{
t0 &= 0xFF00FF00;
t1 &= 0x00FF00FF;
}
else
{
t0 &= 0xCCCCCCCC;
t1 &= 0x33333333;
}
// Flip selectors from sign bit
unsigned int t2 = (t0 | t1) ^ 0xFFFF0000;
return d | static_cast<uint64_t>(_bswap(t2)) << 32;
}
static etcpak_force_inline __m128i r6g7b6_AVX2(__m128 cof, __m128 chf, __m128 cvf) noexcept
{
__m128i co = _mm_cvttps_epi32(cof);
__m128i ch = _mm_cvttps_epi32(chf);
__m128i cv = _mm_cvttps_epi32(cvf);
__m128i coh = _mm_packus_epi32(co, ch);
__m128i cv0 = _mm_packus_epi32(cv, _mm_setzero_si128());
__m256i cohv0 = _mm256_inserti128_si256(_mm256_castsi128_si256(coh), cv0, 1);
__m256i cohv1 = _mm256_min_epu16(cohv0, _mm256_set1_epi16(1023));
__m256i cohv2 = _mm256_sub_epi16(cohv1, _mm256_set1_epi16(15));
__m256i cohv3 = _mm256_srai_epi16(cohv2, 1);
__m256i cohvrb0 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(11));
__m256i cohvrb1 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(4));
__m256i cohvg0 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(9));
__m256i cohvg1 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(6));
__m256i cohvrb2 = _mm256_srai_epi16(cohvrb0, 7);
__m256i cohvrb3 = _mm256_srai_epi16(cohvrb1, 7);
__m256i cohvg2 = _mm256_srai_epi16(cohvg0, 8);
__m256i cohvg3 = _mm256_srai_epi16(cohvg1, 8);
__m256i cohvrb4 = _mm256_sub_epi16(cohvrb0, cohvrb2);
__m256i cohvrb5 = _mm256_sub_epi16(cohvrb4, cohvrb3);
__m256i cohvg4 = _mm256_sub_epi16(cohvg0, cohvg2);
__m256i cohvg5 = _mm256_sub_epi16(cohvg4, cohvg3);
__m256i cohvrb6 = _mm256_srai_epi16(cohvrb5, 3);
__m256i cohvg6 = _mm256_srai_epi16(cohvg5, 2);
__m256i cohv4 = _mm256_blend_epi16(cohvg6, cohvrb6, 0x55);
__m128i cohv5 = _mm_packus_epi16(_mm256_castsi256_si128(cohv4), _mm256_extracti128_si256(cohv4, 1));
return _mm_shuffle_epi8(cohv5, _mm_setr_epi8(6, 5, 4, -1, 2, 1, 0, -1, 10, 9, 8, -1, -1, -1, -1, -1));
}
static etcpak_force_inline Plane Planar_AVX2( const Channels& ch, uint8_t& mode, bool useHeuristics )
{
__m128i t0 = _mm_sad_epu8( ch.r8, _mm_setzero_si128() );
__m128i t1 = _mm_sad_epu8( ch.g8, _mm_setzero_si128() );
__m128i t2 = _mm_sad_epu8( ch.b8, _mm_setzero_si128() );
__m128i r8s = _mm_shuffle_epi8( ch.r8, _mm_set_epi8( 0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0 ) );
__m128i g8s = _mm_shuffle_epi8( ch.g8, _mm_set_epi8( 0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0 ) );
__m128i b8s = _mm_shuffle_epi8( ch.b8, _mm_set_epi8( 0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0 ) );
__m128i s0 = _mm_sad_epu8( r8s, _mm_setzero_si128() );
__m128i s1 = _mm_sad_epu8( g8s, _mm_setzero_si128() );
__m128i s2 = _mm_sad_epu8( b8s, _mm_setzero_si128() );
__m256i sr0 = _mm256_insertf128_si256( _mm256_castsi128_si256( t0 ), s0, 1 );
__m256i sg0 = _mm256_insertf128_si256( _mm256_castsi128_si256( t1 ), s1, 1 );
__m256i sb0 = _mm256_insertf128_si256( _mm256_castsi128_si256( t2 ), s2, 1 );
__m256i sr1 = _mm256_slli_epi64( sr0, 32 );
__m256i sg1 = _mm256_slli_epi64( sg0, 16 );
__m256i srb = _mm256_or_si256( sr1, sb0 );
__m256i srgb = _mm256_or_si256( srb, sg1 );
if( mode != ModePlanar && useHeuristics )
{
Plane plane;
plane.sum4 = _mm256_permute4x64_epi64( srgb, _MM_SHUFFLE( 2, 3, 0, 1 ) );
return plane;
}
__m128i t3 = _mm_castps_si128( _mm_shuffle_ps( _mm_castsi128_ps( t0 ), _mm_castsi128_ps( t1 ), _MM_SHUFFLE( 2, 0, 2, 0 ) ) );
__m128i t4 = _mm_shuffle_epi32( t2, _MM_SHUFFLE( 3, 1, 2, 0 ) );
__m128i t5 = _mm_hadd_epi32( t3, t4 );
__m128i t6 = _mm_shuffle_epi32( t5, _MM_SHUFFLE( 1, 1, 1, 1 ) );
__m128i t7 = _mm_shuffle_epi32( t5, _MM_SHUFFLE( 2, 2, 2, 2 ) );
__m256i sr = _mm256_broadcastw_epi16( t5 );
__m256i sg = _mm256_broadcastw_epi16( t6 );
__m256i sb = _mm256_broadcastw_epi16( t7 );
__m256i r08 = _mm256_cvtepu8_epi16( ch.r8 );
__m256i g08 = _mm256_cvtepu8_epi16( ch.g8 );
__m256i b08 = _mm256_cvtepu8_epi16( ch.b8 );
__m256i r16 = _mm256_slli_epi16( r08, 4 );
__m256i g16 = _mm256_slli_epi16( g08, 4 );
__m256i b16 = _mm256_slli_epi16( b08, 4 );
__m256i difR0 = _mm256_sub_epi16( r16, sr );
__m256i difG0 = _mm256_sub_epi16( g16, sg );
__m256i difB0 = _mm256_sub_epi16( b16, sb );
__m256i difRyz = _mm256_madd_epi16( difR0, _mm256_set_epi16( 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255 ) );
__m256i difGyz = _mm256_madd_epi16( difG0, _mm256_set_epi16( 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255 ) );
__m256i difByz = _mm256_madd_epi16( difB0, _mm256_set_epi16( 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255 ) );
__m256i difRxz = _mm256_madd_epi16( difR0, _mm256_set_epi16( 255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255 ) );
__m256i difGxz = _mm256_madd_epi16( difG0, _mm256_set_epi16( 255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255 ) );
__m256i difBxz = _mm256_madd_epi16( difB0, _mm256_set_epi16( 255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255 ) );
__m256i difRGyz = _mm256_hadd_epi32( difRyz, difGyz );
__m256i difByzxz = _mm256_hadd_epi32( difByz, difBxz );
__m256i difRGxz = _mm256_hadd_epi32( difRxz, difGxz );
__m128i sumRGyz = _mm_add_epi32( _mm256_castsi256_si128( difRGyz ), _mm256_extracti128_si256( difRGyz, 1 ) );
__m128i sumByzxz = _mm_add_epi32( _mm256_castsi256_si128( difByzxz ), _mm256_extracti128_si256( difByzxz, 1 ) );
__m128i sumRGxz = _mm_add_epi32( _mm256_castsi256_si128( difRGxz ), _mm256_extracti128_si256( difRGxz, 1 ) );
__m128i sumRGByz = _mm_hadd_epi32( sumRGyz, sumByzxz );
__m128i sumRGByzxz = _mm_hadd_epi32( sumRGxz, sumByzxz );
__m128i sumRGBxz = _mm_shuffle_epi32( sumRGByzxz, _MM_SHUFFLE( 2, 3, 1, 0 ) );
__m128 sumRGByzf = _mm_cvtepi32_ps( sumRGByz );
__m128 sumRGBxzf = _mm_cvtepi32_ps( sumRGBxz );
const float value = ( 255 * 255 * 8.0f + 85 * 85 * 8.0f ) * 16.0f;
__m128 scale = _mm_set1_ps( -4.0f / value );
__m128 af = _mm_mul_ps( sumRGBxzf, scale );
__m128 bf = _mm_mul_ps( sumRGByzf, scale );
__m128 df = _mm_mul_ps( _mm_cvtepi32_ps( t5 ), _mm_set1_ps( 4.0f / 16.0f ) );
// calculating the three colors RGBO, RGBH, and RGBV. RGB = df - af * x - bf * y;
__m128 cof0 = _mm_fnmadd_ps( af, _mm_set1_ps( -255.0f ), _mm_fnmadd_ps( bf, _mm_set1_ps( -255.0f ), df ) );
__m128 chf0 = _mm_fnmadd_ps( af, _mm_set1_ps( 425.0f ), _mm_fnmadd_ps( bf, _mm_set1_ps( -255.0f ), df ) );
__m128 cvf0 = _mm_fnmadd_ps( af, _mm_set1_ps( -255.0f ), _mm_fnmadd_ps( bf, _mm_set1_ps( 425.0f ), df ) );
// convert to r6g7b6
__m128i cohv = r6g7b6_AVX2( cof0, chf0, cvf0 );
uint64_t rgbho = _mm_extract_epi64( cohv, 0 );
uint32_t rgbv0 = _mm_extract_epi32( cohv, 2 );
// Error calculation
uint64_t error = 0;
if( !useHeuristics )
{
auto ro0 = ( rgbho >> 48 ) & 0x3F;
auto go0 = ( rgbho >> 40 ) & 0x7F;
auto bo0 = ( rgbho >> 32 ) & 0x3F;
auto ro1 = ( ro0 >> 4 ) | ( ro0 << 2 );
auto go1 = ( go0 >> 6 ) | ( go0 << 1 );
auto bo1 = ( bo0 >> 4 ) | ( bo0 << 2 );
auto ro2 = ( ro1 << 2 ) + 2;
auto go2 = ( go1 << 2 ) + 2;
auto bo2 = ( bo1 << 2 ) + 2;
__m256i ro3 = _mm256_set1_epi16( ro2 );
__m256i go3 = _mm256_set1_epi16( go2 );
__m256i bo3 = _mm256_set1_epi16( bo2 );
auto rh0 = ( rgbho >> 16 ) & 0x3F;
auto gh0 = ( rgbho >> 8 ) & 0x7F;
auto bh0 = ( rgbho >> 0 ) & 0x3F;
auto rh1 = ( rh0 >> 4 ) | ( rh0 << 2 );
auto gh1 = ( gh0 >> 6 ) | ( gh0 << 1 );
auto bh1 = ( bh0 >> 4 ) | ( bh0 << 2 );
auto rh2 = rh1 - ro1;
auto gh2 = gh1 - go1;
auto bh2 = bh1 - bo1;
__m256i rh3 = _mm256_set1_epi16( rh2 );
__m256i gh3 = _mm256_set1_epi16( gh2 );
__m256i bh3 = _mm256_set1_epi16( bh2 );
auto rv0 = ( rgbv0 >> 16 ) & 0x3F;
auto gv0 = ( rgbv0 >> 8 ) & 0x7F;
auto bv0 = ( rgbv0 >> 0 ) & 0x3F;
auto rv1 = ( rv0 >> 4 ) | ( rv0 << 2 );
auto gv1 = ( gv0 >> 6 ) | ( gv0 << 1 );
auto bv1 = ( bv0 >> 4 ) | ( bv0 << 2 );
auto rv2 = rv1 - ro1;
auto gv2 = gv1 - go1;
auto bv2 = bv1 - bo1;
__m256i rv3 = _mm256_set1_epi16( rv2 );
__m256i gv3 = _mm256_set1_epi16( gv2 );
__m256i bv3 = _mm256_set1_epi16( bv2 );
__m256i x = _mm256_set_epi16( 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 );
__m256i rh4 = _mm256_mullo_epi16( rh3, x );
__m256i gh4 = _mm256_mullo_epi16( gh3, x );
__m256i bh4 = _mm256_mullo_epi16( bh3, x );
__m256i y = _mm256_set_epi16( 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0 );
__m256i rv4 = _mm256_mullo_epi16( rv3, y );
__m256i gv4 = _mm256_mullo_epi16( gv3, y );
__m256i bv4 = _mm256_mullo_epi16( bv3, y );
__m256i rxy = _mm256_add_epi16( rh4, rv4 );
__m256i gxy = _mm256_add_epi16( gh4, gv4 );
__m256i bxy = _mm256_add_epi16( bh4, bv4 );
__m256i rp0 = _mm256_add_epi16( rxy, ro3 );
__m256i gp0 = _mm256_add_epi16( gxy, go3 );
__m256i bp0 = _mm256_add_epi16( bxy, bo3 );
__m256i rp1 = _mm256_srai_epi16( rp0, 2 );
__m256i gp1 = _mm256_srai_epi16( gp0, 2 );
__m256i bp1 = _mm256_srai_epi16( bp0, 2 );
__m256i rp2 = _mm256_max_epi16( _mm256_min_epi16( rp1, _mm256_set1_epi16( 255 ) ), _mm256_setzero_si256() );
__m256i gp2 = _mm256_max_epi16( _mm256_min_epi16( gp1, _mm256_set1_epi16( 255 ) ), _mm256_setzero_si256() );
__m256i bp2 = _mm256_max_epi16( _mm256_min_epi16( bp1, _mm256_set1_epi16( 255 ) ), _mm256_setzero_si256() );
__m256i rdif = _mm256_sub_epi16( r08, rp2 );
__m256i gdif = _mm256_sub_epi16( g08, gp2 );
__m256i bdif = _mm256_sub_epi16( b08, bp2 );
__m256i rerr = _mm256_mullo_epi16( rdif, _mm256_set1_epi16( 38 ) );
__m256i gerr = _mm256_mullo_epi16( gdif, _mm256_set1_epi16( 76 ) );
__m256i berr = _mm256_mullo_epi16( bdif, _mm256_set1_epi16( 14 ) );
__m256i sum0 = _mm256_add_epi16( rerr, gerr );
__m256i sum1 = _mm256_add_epi16( sum0, berr );
__m256i sum2 = _mm256_madd_epi16( sum1, sum1 );
__m128i sum3 = _mm_add_epi32( _mm256_castsi256_si128( sum2 ), _mm256_extracti128_si256( sum2, 1 ) );
uint32_t err0 = _mm_extract_epi32( sum3, 0 );
uint32_t err1 = _mm_extract_epi32( sum3, 1 );
uint32_t err2 = _mm_extract_epi32( sum3, 2 );
uint32_t err3 = _mm_extract_epi32( sum3, 3 );
error = err0 + err1 + err2 + err3;
}
/**/
uint32_t rgbv = ( rgbv0 & 0x3F ) | ( ( rgbv0 >> 2 ) & 0x1FC0 ) | ( ( rgbv0 >> 3 ) & 0x7E000 );
uint64_t rgbho0_ = ( rgbho & 0x3F0000003F ) | ( ( rgbho >> 2 ) & 0x1FC000001FC0 ) | ( ( rgbho >> 3 ) & 0x7E0000007E000 );
uint64_t rgbho0 = ( rgbho0_ & 0x7FFFF ) | ( ( rgbho0_ >> 13 ) & 0x3FFFF80000 );
uint32_t hi = rgbv | ((rgbho0 & 0x1FFF) << 19);
rgbho0 >>= 13;
uint32_t lo = ( rgbho0 & 0x1 ) | ( ( rgbho0 & 0x1FE ) << 1 ) | ( ( rgbho0 & 0x600 ) << 2 ) | ( ( rgbho0 & 0x3F800 ) << 5 ) | ( ( rgbho0 & 0x1FC0000 ) << 6 );