mirror of
https://github.com/wolfpld/tracy.git
synced 2024-11-10 10:41:50 +00:00
118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
#include "TracyDxt1.hpp"
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#ifdef __ARM_NEON
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# include <arm_neon.h>
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#endif
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#if defined __AVX__ && !defined __SSE4_1__
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# define __SSE4_1__
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#endif
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#ifdef _MSC_VER
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# ifdef __SSE4_1__
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# include <intrin.h>
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# else
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# include <x86intrin.h>
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# endif
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#endif
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namespace tracy
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{
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static inline uint16_t to565( uint8_t r, uint8_t g, uint8_t b )
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{
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return ( ( r & 0xF8 ) << 8 ) | ( ( g & 0xFC ) << 3 ) | ( b >> 3 );
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}
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static uint64_t CheckSolid( const uint8_t* src )
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{
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const auto ref = to565( src[0], src[1], src[2] );
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src += 4;
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for( int i=1; i<16; i++ )
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{
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if( to565( src[0], src[1], src[2] ) != ref )
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{
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return 0;
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}
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src += 4;
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}
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return uint64_t( ref );
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}
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static const uint8_t IndexTable[4] = { 1, 3, 2, 0 };
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static uint64_t ProcessRGB( const uint8_t* src )
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{
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const auto solid = CheckSolid( src );
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if( solid != 0 ) return solid;
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uint8_t min[3] = { src[0], src[1], src[2] };
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uint8_t max[3] = { src[0], src[1], src[2] };
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auto tmp = src + 4;
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for( int i=1; i<16; i++ )
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{
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for( int j=0; j<3; j++ )
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{
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if( tmp[j] < min[j] ) min[j] = tmp[j];
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else if( tmp[j] > max[j] ) max[j] = tmp[j];
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}
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tmp += 4;
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}
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uint32_t range = ( 4 << 13 ) / ( 1 + max[0] - min[0] + max[1] - min[1] + max[2] - min[2] );
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uint8_t rmin[3] = { min[0], min[1], min[2] };
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for( int i=0; i<3; i++ )
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{
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const uint8_t inset = ( max[i] - min[i] ) >> 4;
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min[i] += inset;
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max[i] -= inset;
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}
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uint32_t data = 0;
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for( int i=0; i<16; i++ )
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{
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uint32_t c = src[0] - rmin[0] + src[1] - rmin[1] + src[2] - rmin[2];
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uint8_t idx = IndexTable[( c * range ) >> 13];
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data |= idx << (i*2);
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src += 4;
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}
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return uint64_t( ( uint64_t( to565( min[0], min[1], min[2] ) ) << 16 ) | to565( max[0], max[1], max[2] ) | ( uint64_t( data ) << 32 ) );
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}
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void CompressImageDxt1( const char* src, char* dst, int w, int h )
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{
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assert( (w % 4) == 0 && (h % 4) == 0 );
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uint32_t buf[4*4];
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int i = 0;
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auto ptr = dst;
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auto blocks = w * h / 16;
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do
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{
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auto tmp = (char*)buf;
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memcpy( tmp, src, 4*4 );
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memcpy( tmp + 4*4, src + w * 4, 4*4 );
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memcpy( tmp + 8*4, src + w * 8, 4*4 );
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memcpy( tmp + 12*4, src + w * 12, 4*4 );
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src += 4*4;
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if( ++i == w/4 )
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{
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src += w * 3 * 4;
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i = 0;
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}
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const auto c = ProcessRGB( (uint8_t*)buf );
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memcpy( ptr, &c, sizeof( uint64_t ) );
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ptr += sizeof( uint64_t );
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}
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while( --blocks );
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}
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}
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