mirror of
https://github.com/yuzu-emu/FasTC
synced 2024-11-22 10:03:48 +00:00
Pavel Krajcevski
parent
e19d4ec0a8
commit
6171a48b6a
1 changed files with 70 additions and 13 deletions
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@ -1,4 +1,4 @@
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// stb_dxt.h - v1.04 - DXT1/DXT5 compressor - public domain
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// stb_dxt.h - v1.06 - DXT1/DXT5 compressor - public domain
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// original by fabian "ryg" giesen - ported to C by stb
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// use '#define STB_DXT_IMPLEMENTATION' before including to create the implementation
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//
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@ -9,6 +9,8 @@
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// and "high quality" using mode.
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//
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// version history:
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// v1.06 - (stb) fix to known-broken 1.05
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// v1.05 - (stb) support bc5/3dc (Arvids Kokins), use extern "C" in C++ (Pavel Krajcevski)
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// v1.04 - (ryg) default to no rounding bias for lerped colors (as per S3TC/DX10 spec);
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// single color match fix (allow for inexact color interpolation);
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// optimal DXT5 index finder; "high quality" mode that runs multiple refinement steps.
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@ -19,9 +21,7 @@
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//
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// LICENSE
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//
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// This software is dual-licensed to the public domain and under the following
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// license: you are granted a perpetual, irrevocable license to copy, modify,
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// publish, and distribute this file as you see fit.
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// See end of file for license information.
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#ifndef STB_INCLUDE_STB_DXT_H
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#define STB_INCLUDE_STB_DXT_H
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@ -31,7 +31,17 @@
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#define STB_DXT_DITHER 1 // use dithering. dubious win. never use for normal maps and the like!
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#define STB_DXT_HIGHQUAL 2 // high quality mode, does two refinement steps instead of 1. ~30-40% slower.
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void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src, int alpha, int mode);
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#ifdef __cplusplus
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extern "C" {
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#endif
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void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src_rgba_four_bytes_per_pixel, int alpha, int mode);
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void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src_rg_two_byte_per_pixel);
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#ifdef __cplusplus
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}
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#endif
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#define STB_COMPRESS_DXT_BLOCK
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#ifdef STB_DXT_IMPLEMENTATION
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@ -519,7 +529,7 @@ static void stb__CompressColorBlock(unsigned char *dest, unsigned char *block, i
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}
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// write the color block
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if(max16 <= min16)
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if(max16 < min16)
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{
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unsigned short t = min16;
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min16 = max16;
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@ -538,18 +548,18 @@ static void stb__CompressColorBlock(unsigned char *dest, unsigned char *block, i
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}
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// Alpha block compression (this is easy for a change)
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static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src,int mode)
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static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src, int stride)
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{
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int i,dist,bias,dist4,dist2,bits,mask;
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// find min/max color
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int mn,mx;
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mn = mx = src[3];
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mn = mx = src[0];
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for (i=1;i<16;i++)
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{
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if (src[i*4+3] < mn) mn = src[i*4+3];
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else if (src[i*4+3] > mx) mx = src[i*4+3];
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if (src[i*stride] < mn) mn = src[i*stride];
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else if (src[i*stride] > mx) mx = src[i*stride];
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}
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// encode them
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@ -568,7 +578,7 @@ static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src,int m
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bits = 0,mask=0;
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for (i=0;i<16;i++) {
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int a = src[i*4+3]*7 + bias;
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int a = src[i*stride]*7 + bias;
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int ind,t;
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// select index. this is a "linear scale" lerp factor between 0 (val=min) and 7 (val=max).
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@ -619,12 +629,59 @@ void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src, int a
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}
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if (alpha) {
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stb__CompressAlphaBlock(dest,(unsigned char*) src,mode);
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stb__CompressAlphaBlock(dest,(unsigned char*) src+3, 4);
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dest += 8;
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}
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stb__CompressColorBlock(dest,(unsigned char*) src,mode);
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}
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#endif // STB_DXT_IMPLEMENTATION
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void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src)
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{
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stb__CompressAlphaBlock(dest,(unsigned char*) src,2);
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stb__CompressAlphaBlock(dest + 8,(unsigned char*) src+1,2);
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}
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#endif // STB_DXT_IMPLEMENTATION
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#endif // STB_INCLUDE_STB_DXT_H
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/*
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------------------------------------------------------------------------------
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This software is available under 2 licenses -- choose whichever you prefer.
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------------------------------------------------------------------------------
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ALTERNATIVE A - MIT License
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Copyright (c) 2017 Sean Barrett
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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------------------------------------------------------------------------------
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ALTERNATIVE B - Public Domain (www.unlicense.org)
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
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software, either in source code form or as a compiled binary, for any purpose,
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commercial or non-commercial, and by any means.
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In jurisdictions that recognize copyright laws, the author or authors of this
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software dedicate any and all copyright interest in the software to the public
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domain. We make this dedication for the benefit of the public at large and to
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the detriment of our heirs and successors. We intend this dedication to be an
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overt act of relinquishment in perpetuity of all present and future rights to
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this software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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------------------------------------------------------------------------------
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*/
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