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tracy/client/TracyEtc1.cpp
Bartosz Taudul 9ef128995a Add AVX2 version of etcpak.
2019-06-08 00:50:39 +02:00

1159 lines
40 KiB
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#include "TracyEtc1.hpp"
#include <array>
#include <assert.h>
#include <stdint.h>
#include <string.h>
typedef std::array<uint16_t, 4> v4i;
#if defined __AVX__ && !defined __SSE4_1__
# define __SSE4_1__
#endif
#ifdef __AVX2__
#ifdef _MSC_VER
# include <intrin.h>
# include <Windows.h>
# define _bswap(x) _byteswap_ulong(x)
# define VS_VECTORCALL _vectorcall
#else
# include <x86intrin.h>
# pragma GCC push_options
# pragma GCC target ("avx2,fma,bmi2")
# define VS_VECTORCALL
#endif
#ifndef _bswap
# define _bswap(x) __builtin_bswap32(x)
#endif
namespace tracy
{
const __m128i g_table128_SIMD[2] =
{
_mm_setr_epi16( 2*128, 5*128, 9*128, 13*128, 18*128, 24*128, 33*128, 47*128),
_mm_setr_epi16( 8*128, 17*128, 29*128, 42*128, 60*128, 80*128, 106*128, 183*128)
};
#ifdef _MSC_VER
static inline unsigned long _bit_scan_forward( unsigned long mask )
{
unsigned long ret;
_BitScanForward( &ret, mask );
return ret;
}
#endif
static __m256i VS_VECTORCALL 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
}
__m256i VS_VECTORCALL Average_AVX2( const __m256i data) noexcept
{
__m256i a = _mm256_add_epi16(data, _mm256_set1_epi16(4));
return _mm256_srli_epi16(a, 3);
}
static __m128i VS_VECTORCALL 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 void VS_VECTORCALL 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 uint64_t VS_VECTORCALL 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 uint64_t VS_VECTORCALL 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 __m128i VS_VECTORCALL 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 void VS_VECTORCALL 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 void VS_VECTORCALL 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);
}
uint64_t VS_VECTORCALL 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 uint64_t ProcessRGB( const uint8_t* src )
{
uint64_t d = CheckSolid_AVX2( src );
if( d != 0 ) return d;
alignas(32) v4i a[8];
__m128i err0 = PrepareAverages_AVX2( a, src );
// Get index of minimum error (err0)
__m128i err1 = _mm_shuffle_epi32(err0, _MM_SHUFFLE(2, 3, 0, 1));
__m128i errMin0 = _mm_min_epu32(err0, err1);
__m128i errMin1 = _mm_shuffle_epi32(errMin0, _MM_SHUFFLE(1, 0, 3, 2));
__m128i errMin2 = _mm_min_epu32(errMin1, errMin0);
__m128i errMask = _mm_cmpeq_epi32(errMin2, err0);
uint32_t mask = _mm_movemask_epi8(errMask);
uint32_t idx = _bit_scan_forward(mask) >> 2;
d |= EncodeAverages_AVX2( a, idx );
alignas(32) uint32_t terr[2][8] = {};
alignas(32) uint32_t tsel[8];
if ((idx == 0) || (idx == 2))
{
FindBestFit_4x2_AVX2( terr, tsel, a, idx * 2, src );
}
else
{
FindBestFit_2x4_AVX2( terr, tsel, a, idx * 2, src );
}
return EncodeSelectors_AVX2( d, terr, tsel, (idx % 2) == 1 );
}
#else
#ifdef __SSE4_1__
# ifdef _MSC_VER
# include <intrin.h>
# include <Windows.h>
# define _bswap(x) _byteswap_ulong(x)
# else
# include <x86intrin.h>
# endif
#else
# ifndef _MSC_VER
# include <byteswap.h>
# ifndef _bswap
# define _bswap(x) bswap_32(x)
# endif
# endif
#endif
#ifndef _bswap
# define _bswap(x) __builtin_bswap32(x)
#endif
namespace tracy
{
const uint32_t g_avg2[16] = {
0x00,
0x11,
0x22,
0x33,
0x44,
0x55,
0x66,
0x77,
0x88,
0x99,
0xAA,
0xBB,
0xCC,
0xDD,
0xEE,
0xFF
};
const int64_t g_table256[8][4] = {
{ 2*256, 8*256, -2*256, -8*256 },
{ 5*256, 17*256, -5*256, -17*256 },
{ 9*256, 29*256, -9*256, -29*256 },
{ 13*256, 42*256, -13*256, -42*256 },
{ 18*256, 60*256, -18*256, -60*256 },
{ 24*256, 80*256, -24*256, -80*256 },
{ 33*256, 106*256, -33*256, -106*256 },
{ 47*256, 183*256, -47*256, -183*256 }
};
const uint32_t g_id[4][16] = {
{ 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2 },
{ 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4 },
{ 7, 7, 6, 6, 7, 7, 6, 6, 7, 7, 6, 6, 7, 7, 6, 6 }
};
#ifdef __SSE4_1__
const __m128i g_table128_SIMD[2] =
{
_mm_setr_epi16( 2*128, 5*128, 9*128, 13*128, 18*128, 24*128, 33*128, 47*128),
_mm_setr_epi16( 8*128, 17*128, 29*128, 42*128, 60*128, 80*128, 106*128, 183*128)
};
const __m128i g_table256_SIMD[4] =
{
_mm_setr_epi32( 2*256, 5*256, 9*256, 13*256),
_mm_setr_epi32( 8*256, 17*256, 29*256, 42*256),
_mm_setr_epi32( 18*256, 24*256, 33*256, 47*256),
_mm_setr_epi32( 60*256, 80*256, 106*256, 183*256)
};
#endif
template<class T>
static inline T sq( T val )
{
return val * val;
}
static inline int mul8bit( int a, int b )
{
int t = a*b + 128;
return ( t + ( t >> 8 ) ) >> 8;
}
template<class T>
static size_t GetLeastError( const T* err, size_t num )
{
size_t idx = 0;
for( size_t i=1; i<num; i++ )
{
if( err[i] < err[idx] )
{
idx = i;
}
}
return idx;
}
static uint64_t FixByteOrder( uint64_t d )
{
return ( ( d & 0x00000000FFFFFFFF ) ) |
( ( d & 0xFF00000000000000 ) >> 24 ) |
( ( d & 0x000000FF00000000 ) << 24 ) |
( ( d & 0x00FF000000000000 ) >> 8 ) |
( ( d & 0x0000FF0000000000 ) << 8 );
}
template<class T, class S>
static uint64_t EncodeSelectors( uint64_t d, const T terr[2][8], const S tsel[16][8], const uint32_t* id )
{
size_t tidx[2];
tidx[0] = GetLeastError( terr[0], 8 );
tidx[1] = GetLeastError( terr[1], 8 );
d |= tidx[0] << 26;
d |= tidx[1] << 29;
for( int i=0; i<16; i++ )
{
uint64_t t = tsel[i][tidx[id[i]%2]];
d |= ( t & 0x1 ) << ( i + 32 );
d |= ( t & 0x2 ) << ( i + 47 );
}
return d;
}
static void Average( const uint8_t* data, v4i* a )
{
#ifdef __SSE4_1__
__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 d0l = _mm_unpacklo_epi8(d0, _mm_setzero_si128());
__m128i d0h = _mm_unpackhi_epi8(d0, _mm_setzero_si128());
__m128i d1l = _mm_unpacklo_epi8(d1, _mm_setzero_si128());
__m128i d1h = _mm_unpackhi_epi8(d1, _mm_setzero_si128());
__m128i d2l = _mm_unpacklo_epi8(d2, _mm_setzero_si128());
__m128i d2h = _mm_unpackhi_epi8(d2, _mm_setzero_si128());
__m128i d3l = _mm_unpacklo_epi8(d3, _mm_setzero_si128());
__m128i d3h = _mm_unpackhi_epi8(d3, _mm_setzero_si128());
__m128i sum0 = _mm_add_epi16(d0l, d1l);
__m128i sum1 = _mm_add_epi16(d0h, d1h);
__m128i sum2 = _mm_add_epi16(d2l, d3l);
__m128i sum3 = _mm_add_epi16(d2h, d3h);
__m128i sum0l = _mm_unpacklo_epi16(sum0, _mm_setzero_si128());
__m128i sum0h = _mm_unpackhi_epi16(sum0, _mm_setzero_si128());
__m128i sum1l = _mm_unpacklo_epi16(sum1, _mm_setzero_si128());
__m128i sum1h = _mm_unpackhi_epi16(sum1, _mm_setzero_si128());
__m128i sum2l = _mm_unpacklo_epi16(sum2, _mm_setzero_si128());
__m128i sum2h = _mm_unpackhi_epi16(sum2, _mm_setzero_si128());
__m128i sum3l = _mm_unpacklo_epi16(sum3, _mm_setzero_si128());
__m128i sum3h = _mm_unpackhi_epi16(sum3, _mm_setzero_si128());
__m128i b0 = _mm_add_epi32(sum0l, sum0h);
__m128i b1 = _mm_add_epi32(sum1l, sum1h);
__m128i b2 = _mm_add_epi32(sum2l, sum2h);
__m128i b3 = _mm_add_epi32(sum3l, sum3h);
__m128i a0 = _mm_srli_epi32(_mm_add_epi32(_mm_add_epi32(b2, b3), _mm_set1_epi32(4)), 3);
__m128i a1 = _mm_srli_epi32(_mm_add_epi32(_mm_add_epi32(b0, b1), _mm_set1_epi32(4)), 3);
__m128i a2 = _mm_srli_epi32(_mm_add_epi32(_mm_add_epi32(b1, b3), _mm_set1_epi32(4)), 3);
__m128i a3 = _mm_srli_epi32(_mm_add_epi32(_mm_add_epi32(b0, b2), _mm_set1_epi32(4)), 3);
_mm_storeu_si128((__m128i*)&a[0], _mm_packus_epi32(_mm_shuffle_epi32(a0, _MM_SHUFFLE(3, 0, 1, 2)), _mm_shuffle_epi32(a1, _MM_SHUFFLE(3, 0, 1, 2))));
_mm_storeu_si128((__m128i*)&a[2], _mm_packus_epi32(_mm_shuffle_epi32(a2, _MM_SHUFFLE(3, 0, 1, 2)), _mm_shuffle_epi32(a3, _MM_SHUFFLE(3, 0, 1, 2))));
#else
uint32_t r[4];
uint32_t g[4];
uint32_t b[4];
memset(r, 0, sizeof(r));
memset(g, 0, sizeof(g));
memset(b, 0, sizeof(b));
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
int index = (j & 2) + (i >> 1);
b[index] += *data++;
g[index] += *data++;
r[index] += *data++;
data++;
}
}
a[0] = v4i{ uint16_t( (r[2] + r[3] + 4) / 8 ), uint16_t( (g[2] + g[3] + 4) / 8 ), uint16_t( (b[2] + b[3] + 4) / 8 ), 0};
a[1] = v4i{ uint16_t( (r[0] + r[1] + 4) / 8 ), uint16_t( (g[0] + g[1] + 4) / 8 ), uint16_t( (b[0] + b[1] + 4) / 8 ), 0};
a[2] = v4i{ uint16_t( (r[1] + r[3] + 4) / 8 ), uint16_t( (g[1] + g[3] + 4) / 8 ), uint16_t( (b[1] + b[3] + 4) / 8 ), 0};
a[3] = v4i{ uint16_t( (r[0] + r[2] + 4) / 8 ), uint16_t( (g[0] + g[2] + 4) / 8 ), uint16_t( (b[0] + b[2] + 4) / 8 ), 0};
#endif
}
static void CalcErrorBlock( const uint8_t* data, unsigned int err[4][4] )
{
#ifdef __SSE4_1__
__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));
__m128i d0l = _mm_unpacklo_epi8(dm0, _mm_setzero_si128());
__m128i d0h = _mm_unpackhi_epi8(dm0, _mm_setzero_si128());
__m128i d1l = _mm_unpacklo_epi8(dm1, _mm_setzero_si128());
__m128i d1h = _mm_unpackhi_epi8(dm1, _mm_setzero_si128());
__m128i d2l = _mm_unpacklo_epi8(dm2, _mm_setzero_si128());
__m128i d2h = _mm_unpackhi_epi8(dm2, _mm_setzero_si128());
__m128i d3l = _mm_unpacklo_epi8(dm3, _mm_setzero_si128());
__m128i d3h = _mm_unpackhi_epi8(dm3, _mm_setzero_si128());
__m128i sum0 = _mm_add_epi16(d0l, d1l);
__m128i sum1 = _mm_add_epi16(d0h, d1h);
__m128i sum2 = _mm_add_epi16(d2l, d3l);
__m128i sum3 = _mm_add_epi16(d2h, d3h);
__m128i sum0l = _mm_unpacklo_epi16(sum0, _mm_setzero_si128());
__m128i sum0h = _mm_unpackhi_epi16(sum0, _mm_setzero_si128());
__m128i sum1l = _mm_unpacklo_epi16(sum1, _mm_setzero_si128());
__m128i sum1h = _mm_unpackhi_epi16(sum1, _mm_setzero_si128());
__m128i sum2l = _mm_unpacklo_epi16(sum2, _mm_setzero_si128());
__m128i sum2h = _mm_unpackhi_epi16(sum2, _mm_setzero_si128());
__m128i sum3l = _mm_unpacklo_epi16(sum3, _mm_setzero_si128());
__m128i sum3h = _mm_unpackhi_epi16(sum3, _mm_setzero_si128());
__m128i b0 = _mm_add_epi32(sum0l, sum0h);
__m128i b1 = _mm_add_epi32(sum1l, sum1h);
__m128i b2 = _mm_add_epi32(sum2l, sum2h);
__m128i b3 = _mm_add_epi32(sum3l, sum3h);
__m128i a0 = _mm_add_epi32(b2, b3);
__m128i a1 = _mm_add_epi32(b0, b1);
__m128i a2 = _mm_add_epi32(b1, b3);
__m128i a3 = _mm_add_epi32(b0, b2);
_mm_storeu_si128((__m128i*)&err[0], a0);
_mm_storeu_si128((__m128i*)&err[1], a1);
_mm_storeu_si128((__m128i*)&err[2], a2);
_mm_storeu_si128((__m128i*)&err[3], a3);
#else
unsigned int terr[4][4];
memset(terr, 0, 16 * sizeof(unsigned int));
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
int index = (j & 2) + (i >> 1);
unsigned int d = *data++;
terr[index][0] += d;
d = *data++;
terr[index][1] += d;
d = *data++;
terr[index][2] += d;
data++;
}
}
for( int i=0; i<3; i++ )
{
err[0][i] = terr[2][i] + terr[3][i];
err[1][i] = terr[0][i] + terr[1][i];
err[2][i] = terr[1][i] + terr[3][i];
err[3][i] = terr[0][i] + terr[2][i];
}
for( int i=0; i<4; i++ )
{
err[i][3] = 0;
}
#endif
}
static unsigned int CalcError( const unsigned int block[4], const v4i& average )
{
unsigned int err = 0x3FFFFFFF; // Big value to prevent negative values, but small enough to prevent overflow
err -= block[0] * 2 * average[2];
err -= block[1] * 2 * average[1];
err -= block[2] * 2 * average[0];
err += 8 * ( sq( average[0] ) + sq( average[1] ) + sq( average[2] ) );
return err;
}
void ProcessAverages( v4i* a )
{
#ifdef __SSE4_1__
for( int i=0; i<2; i++ )
{
__m128i d = _mm_loadu_si128((__m128i*)a[i*2].data());
__m128i t = _mm_add_epi16(_mm_mullo_epi16(d, _mm_set1_epi16(31)), _mm_set1_epi16(128));
__m128i c = _mm_srli_epi16(_mm_add_epi16(t, _mm_srli_epi16(t, 8)), 8);
__m128i c1 = _mm_shuffle_epi32(c, _MM_SHUFFLE(3, 2, 3, 2));
__m128i diff = _mm_sub_epi16(c, c1);
diff = _mm_max_epi16(diff, _mm_set1_epi16(-4));
diff = _mm_min_epi16(diff, _mm_set1_epi16(3));
__m128i co = _mm_add_epi16(c1, diff);
c = _mm_blend_epi16(co, c, 0xF0);
__m128i a0 = _mm_or_si128(_mm_slli_epi16(c, 3), _mm_srli_epi16(c, 2));
_mm_storeu_si128((__m128i*)a[4+i*2].data(), a0);
}
for( int i=0; i<2; i++ )
{
__m128i d = _mm_loadu_si128((__m128i*)a[i*2].data());
__m128i t0 = _mm_add_epi16(_mm_mullo_epi16(d, _mm_set1_epi16(15)), _mm_set1_epi16(128));
__m128i t1 = _mm_srli_epi16(_mm_add_epi16(t0, _mm_srli_epi16(t0, 8)), 8);
__m128i t2 = _mm_or_si128(t1, _mm_slli_epi16(t1, 4));
_mm_storeu_si128((__m128i*)a[i*2].data(), t2);
}
#else
for( int i=0; i<2; i++ )
{
for( int j=0; j<3; j++ )
{
int32_t c1 = mul8bit( a[i*2+1][j], 31 );
int32_t c2 = mul8bit( a[i*2][j], 31 );
int32_t diff = c2 - c1;
if( diff > 3 ) diff = 3;
else if( diff < -4 ) diff = -4;
int32_t co = c1 + diff;
a[5+i*2][j] = ( c1 << 3 ) | ( c1 >> 2 );
a[4+i*2][j] = ( co << 3 ) | ( co >> 2 );
}
}
for( int i=0; i<4; i++ )
{
a[i][0] = g_avg2[mul8bit( a[i][0], 15 )];
a[i][1] = g_avg2[mul8bit( a[i][1], 15 )];
a[i][2] = g_avg2[mul8bit( a[i][2], 15 )];
}
#endif
}
static void EncodeAverages( uint64_t& _d, const v4i* a, size_t idx )
{
auto d = _d;
d |= ( idx << 24 );
size_t base = idx << 1;
if( ( idx & 0x2 ) == 0 )
{
for( int i=0; i<3; i++ )
{
d |= uint64_t( a[base+0][i] >> 4 ) << ( i*8 );
d |= uint64_t( a[base+1][i] >> 4 ) << ( i*8 + 4 );
}
}
else
{
for( int i=0; i<3; i++ )
{
d |= uint64_t( a[base+1][i] & 0xF8 ) << ( i*8 );
int32_t c = ( ( a[base+0][i] & 0xF8 ) - ( a[base+1][i] & 0xF8 ) ) >> 3;
c &= ~0xFFFFFFF8;
d |= ((uint64_t)c) << ( i*8 );
}
}
_d = d;
}
static uint64_t CheckSolid( const uint8_t* src )
{
#ifdef __SSE4_1__
__m128i d0 = _mm_loadu_si128(((__m128i*)src) + 0);
__m128i d1 = _mm_loadu_si128(((__m128i*)src) + 1);
__m128i d2 = _mm_loadu_si128(((__m128i*)src) + 2);
__m128i d3 = _mm_loadu_si128(((__m128i*)src) + 3);
__m128i c = _mm_shuffle_epi32(d0, _MM_SHUFFLE(0, 0, 0, 0));
__m128i c0 = _mm_cmpeq_epi8(d0, c);
__m128i c1 = _mm_cmpeq_epi8(d1, c);
__m128i c2 = _mm_cmpeq_epi8(d2, c);
__m128i c3 = _mm_cmpeq_epi8(d3, c);
__m128i m0 = _mm_and_si128(c0, c1);
__m128i m1 = _mm_and_si128(c2, c3);
__m128i m = _mm_and_si128(m0, m1);
if (!_mm_testc_si128(m, _mm_set1_epi32(-1)))
{
return 0;
}
#else
const uint8_t* ptr = src + 4;
for( int i=1; i<16; i++ )
{
if( memcmp( src, ptr, 4 ) != 0 )
{
return 0;
}
ptr += 4;
}
#endif
return 0x02000000 |
( (unsigned int)( src[0] & 0xF8 ) << 16 ) |
( (unsigned int)( src[1] & 0xF8 ) << 8 ) |
( (unsigned int)( src[2] & 0xF8 ) );
}
static void PrepareAverages( v4i a[8], const uint8_t* src, unsigned int err[4] )
{
Average( src, a );
ProcessAverages( a );
unsigned int errblock[4][4];
CalcErrorBlock( src, errblock );
for( int i=0; i<4; i++ )
{
err[i/2] += CalcError( errblock[i], a[i] );
err[2+i/2] += CalcError( errblock[i], a[i+4] );
}
}
static void FindBestFit( uint64_t terr[2][8], uint16_t tsel[16][8], v4i a[8], const uint32_t* id, const uint8_t* data )
{
for( size_t i=0; i<16; i++ )
{
uint16_t* sel = tsel[i];
unsigned int bid = id[i];
uint64_t* ter = terr[bid%2];
uint8_t b = *data++;
uint8_t g = *data++;
uint8_t r = *data++;
data++;
int dr = a[bid][0] - r;
int dg = a[bid][1] - g;
int db = a[bid][2] - b;
int pix = dr * 77 + dg * 151 + db * 28;
for( int t=0; t<8; t++ )
{
const int64_t* tab = g_table256[t];
unsigned int idx = 0;
uint64_t err = sq( tab[0] + pix );
for( int j=1; j<4; j++ )
{
uint64_t local = sq( tab[j] + pix );
if( local < err )
{
err = local;
idx = j;
}
}
*sel++ = idx;
*ter++ += err;
}
}
}
#ifdef __SSE4_1__
// Non-reference implementation, but faster. Produces same results as the AVX2 version
static void FindBestFit( uint32_t terr[2][8], uint16_t tsel[16][8], v4i a[8], const uint32_t* id, const uint8_t* data )
{
for( size_t i=0; i<16; i++ )
{
uint16_t* sel = tsel[i];
unsigned int bid = id[i];
uint32_t* ter = terr[bid%2];
uint8_t b = *data++;
uint8_t g = *data++;
uint8_t r = *data++;
data++;
int dr = a[bid][0] - r;
int dg = a[bid][1] - g;
int db = a[bid][2] - b;
// 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
__m128i pixel = _mm_set1_epi16(dr * 38 + dg * 76 + db * 14);
__m128i pix = _mm_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.
__m128i error0 = _mm_abs_epi16(_mm_sub_epi16(pix, g_table128_SIMD[0]));
__m128i error1 = _mm_abs_epi16(_mm_sub_epi16(pix, g_table128_SIMD[1]));
__m128i index = _mm_and_si128(_mm_cmplt_epi16(error1, error0), _mm_set1_epi16(1));
__m128i minError = _mm_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
// This produces slightly different results, but is needed to produce same results as AVX2 implementation
__m128i indexBit = _mm_andnot_si128(_mm_srli_epi16(pixel, 15), _mm_set1_epi8(-1));
__m128i minIndex = _mm_or_si128(index, _mm_add_epi16(indexBit, indexBit));
// Squaring the minimum error to produce correct values when adding
__m128i squareErrorLo = _mm_mullo_epi16(minError, minError);
__m128i squareErrorHi = _mm_mulhi_epi16(minError, minError);
__m128i squareErrorLow = _mm_unpacklo_epi16(squareErrorLo, squareErrorHi);
__m128i squareErrorHigh = _mm_unpackhi_epi16(squareErrorLo, squareErrorHi);
squareErrorLow = _mm_add_epi32(squareErrorLow, _mm_loadu_si128(((__m128i*)ter) + 0));
_mm_storeu_si128(((__m128i*)ter) + 0, squareErrorLow);
squareErrorHigh = _mm_add_epi32(squareErrorHigh, _mm_loadu_si128(((__m128i*)ter) + 1));
_mm_storeu_si128(((__m128i*)ter) + 1, squareErrorHigh);
_mm_storeu_si128((__m128i*)sel, minIndex);
}
}
#endif
static uint64_t ProcessRGB( const uint8_t* src )
{
uint64_t d = CheckSolid( src );
if( d != 0 ) return d;
v4i a[8];
unsigned int err[4] = {};
PrepareAverages( a, src, err );
size_t idx = GetLeastError( err, 4 );
EncodeAverages( d, a, idx );
#if defined __SSE4_1__
uint32_t terr[2][8] = {};
#else
uint64_t terr[2][8] = {};
#endif
uint16_t tsel[16][8];
auto id = g_id[idx];
FindBestFit( terr, tsel, a, id, src );
return FixByteOrder( EncodeSelectors( d, terr, tsel, id ) );
}
#endif
void CompressImageEtc1( const char* src, char* dst, int w, int h )
{
assert( (w % 4) == 0 && (h % 4) == 0 );
uint32_t buf[4*4];
int i = 0;
auto ptr = dst;
auto blocks = w * h / 16;
do
{
auto tmp = (char*)buf;
for( int x=0; x<4; x++ )
{
memcpy( tmp, src, 4 );
memcpy( tmp + 4, src + w * 4, 4 );
memcpy( tmp + 8, src + w * 8, 4 );
memcpy( tmp + 12, src + w * 12, 4 );
src += 4;
tmp += 16;
}
if( ++i == w/4 )
{
src += w * 3 * 4;
i = 0;
}
const auto c = ProcessRGB( (uint8_t*)buf );
memcpy( ptr, &c, sizeof( uint64_t ) );
ptr += sizeof( uint64_t );
}
while( --blocks );
}
}
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