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Update to stb_dxt.h 1.06.

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Fixes #30.
This commit is contained in:
Pavel Krajcevski 2017-05-29 11:37:42 -07:00
parent e19d4ec0a8
commit 6171a48b6a
1 changed files with 70 additions and 13 deletions
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83
DXTEncoder/src/stb_dxt.h
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@ -1,4 +1,4 @@
// stb_dxt.h - v1.04 - DXT1/DXT5 compressor - public domain // stb_dxt.h - v1.06 - DXT1/DXT5 compressor - public domain
// original by fabian "ryg" giesen - ported to C by stb // original by fabian "ryg" giesen - ported to C by stb
// use '#define STB_DXT_IMPLEMENTATION' before including to create the implementation // use '#define STB_DXT_IMPLEMENTATION' before including to create the implementation
// //
@ -9,6 +9,8 @@
// and "high quality" using mode. // and "high quality" using mode.
// //
// version history: // version history:
// v1.06 - (stb) fix to known-broken 1.05
// v1.05 - (stb) support bc5/3dc (Arvids Kokins), use extern "C" in C++ (Pavel Krajcevski)
// v1.04 - (ryg) default to no rounding bias for lerped colors (as per S3TC/DX10 spec); // v1.04 - (ryg) default to no rounding bias for lerped colors (as per S3TC/DX10 spec);
// single color match fix (allow for inexact color interpolation); // single color match fix (allow for inexact color interpolation);
// optimal DXT5 index finder; "high quality" mode that runs multiple refinement steps. // optimal DXT5 index finder; "high quality" mode that runs multiple refinement steps.
@ -19,9 +21,7 @@
// //
// LICENSE // LICENSE
// //
// This software is dual-licensed to the public domain and under the following // See end of file for license information.
// license: you are granted a perpetual, irrevocable license to copy, modify,
// publish, and distribute this file as you see fit.
#ifndef STB_INCLUDE_STB_DXT_H #ifndef STB_INCLUDE_STB_DXT_H
#define STB_INCLUDE_STB_DXT_H #define STB_INCLUDE_STB_DXT_H
@ -31,7 +31,17 @@
#define STB_DXT_DITHER 1 // use dithering. dubious win. never use for normal maps and the like! #define STB_DXT_DITHER 1 // use dithering. dubious win. never use for normal maps and the like!
#define STB_DXT_HIGHQUAL 2 // high quality mode, does two refinement steps instead of 1. ~30-40% slower. #define STB_DXT_HIGHQUAL 2 // high quality mode, does two refinement steps instead of 1. ~30-40% slower.
void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src, int alpha, int mode); #ifdef __cplusplus
extern "C" {
#endif
void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src_rgba_four_bytes_per_pixel, int alpha, int mode);
void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src_rg_two_byte_per_pixel);
#ifdef __cplusplus
}
#endif
#define STB_COMPRESS_DXT_BLOCK #define STB_COMPRESS_DXT_BLOCK
#ifdef STB_DXT_IMPLEMENTATION #ifdef STB_DXT_IMPLEMENTATION
@ -519,7 +529,7 @@ static void stb__CompressColorBlock(unsigned char *dest, unsigned char *block, i
} }
// write the color block // write the color block
if(max16 <= min16) if(max16 < min16)
{ {
unsigned short t = min16; unsigned short t = min16;
min16 = max16; min16 = max16;
@ -538,18 +548,18 @@ static void stb__CompressColorBlock(unsigned char *dest, unsigned char *block, i
} }
// Alpha block compression (this is easy for a change) // Alpha block compression (this is easy for a change)
static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src,int mode) static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src, int stride)
{ {
int i,dist,bias,dist4,dist2,bits,mask; int i,dist,bias,dist4,dist2,bits,mask;
// find min/max color // find min/max color
int mn,mx; int mn,mx;
mn = mx = src[3]; mn = mx = src[0];
for (i=1;i<16;i++) for (i=1;i<16;i++)
{ {
if (src[i*4+3] < mn) mn = src[i*4+3]; if (src[i*stride] < mn) mn = src[i*stride];
else if (src[i*4+3] > mx) mx = src[i*4+3]; else if (src[i*stride] > mx) mx = src[i*stride];
} }
// encode them // encode them
@ -568,7 +578,7 @@ static void stb__CompressAlphaBlock(unsigned char *dest,unsigned char *src,int m
bits = 0,mask=0; bits = 0,mask=0;
for (i=0;i<16;i++) { for (i=0;i<16;i++) {
int a = src[i*4+3]*7 + bias; int a = src[i*stride]*7 + bias;
int ind,t; int ind,t;
// select index. this is a "linear scale" lerp factor between 0 (val=min) and 7 (val=max). // select index. this is a "linear scale" lerp factor between 0 (val=min) and 7 (val=max).
@ -619,12 +629,59 @@ void stb_compress_dxt_block(unsigned char *dest, const unsigned char *src, int a
} }
if (alpha) { if (alpha) {
stb__CompressAlphaBlock(dest,(unsigned char*) src,mode); stb__CompressAlphaBlock(dest,(unsigned char*) src+3, 4);
dest += 8; dest += 8;
} }
stb__CompressColorBlock(dest,(unsigned char*) src,mode); stb__CompressColorBlock(dest,(unsigned char*) src,mode);
} }
#endif // STB_DXT_IMPLEMENTATION
void stb_compress_bc5_block(unsigned char *dest, const unsigned char *src)
{
stb__CompressAlphaBlock(dest,(unsigned char*) src,2);
stb__CompressAlphaBlock(dest + 8,(unsigned char*) src+1,2);
}
#endif // STB_DXT_IMPLEMENTATION
#endif // STB_INCLUDE_STB_DXT_H #endif // STB_INCLUDE_STB_DXT_H
/*
------------------------------------------------------------------------------
This software is available under 2 licenses -- choose whichever you prefer.
------------------------------------------------------------------------------
ALTERNATIVE A - MIT License
Copyright (c) 2017 Sean Barrett
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
------------------------------------------------------------------------------
ALTERNATIVE B - Public Domain (www.unlicense.org)
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
------------------------------------------------------------------------------
*/