From: Matt Turner Date: Thu, 28 Sep 2017 18:29:25 +0000 (-0700) Subject: mesa: Combine libtxc_dxtn sources into texcompress_s3tc_tmp.h X-Git-Tag: upstream/18.1.0~5581 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f7daa737d17df6d0a847e5c61e48d25e598671f4;p=platform%2Fupstream%2Fmesa.git mesa: Combine libtxc_dxtn sources into texcompress_s3tc_tmp.h Reviewed-by: Nicolai Hähnle Reviewed-by: Emil Velikov --- diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources index 3042da5..2e4cf6f 100644 --- a/src/mesa/Makefile.sources +++ b/src/mesa/Makefile.sources @@ -249,9 +249,6 @@ MAIN_FILES = \ main/textureview.h \ main/transformfeedback.c \ main/transformfeedback.h \ - main/txc_compress_dxtn.c \ - main/txc_dxtn.h \ - main/txc_fetch_dxtn.c \ main/uniform_query.cpp \ main/uniforms.c \ main/uniforms.h \ diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c index 992ad05..e08ed23 100644 --- a/src/mesa/main/texcompress_s3tc.c +++ b/src/mesa/main/texcompress_s3tc.c @@ -37,6 +37,7 @@ #include "mtypes.h" #include "texcompress.h" #include "texcompress_s3tc.h" +#include "texcompress_s3tc_tmp.h" #include "texstore.h" #include "format_unpack.h" #include "util/format_srgb.h" diff --git a/src/mesa/main/txc_compress_dxtn.c b/src/mesa/main/texcompress_s3tc_tmp.h similarity index 81% rename from src/mesa/main/txc_compress_dxtn.c rename to src/mesa/main/texcompress_s3tc_tmp.h index cf83d08..b67b7a2 100644 --- a/src/mesa/main/txc_compress_dxtn.c +++ b/src/mesa/main/texcompress_s3tc_tmp.h @@ -22,9 +22,250 @@ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ -#include -#include -#include "txc_dxtn.h" +#ifdef __APPLE__ +#include +#else +#include +#endif + +typedef GLubyte GLchan; +#define UBYTE_TO_CHAN(b) (b) +#define CHAN_MAX 255 +#define RCOMP 0 +#define GCOMP 1 +#define BCOMP 2 +#define ACOMP 3 + +void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel); +void fetch_2d_texel_rgba_dxt1(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel); +void fetch_2d_texel_rgba_dxt3(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel); +void fetch_2d_texel_rgba_dxt5(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel); + +void tx_compress_dxtn(GLint srccomps, GLint width, GLint height, + const GLubyte *srcPixData, GLenum destformat, + GLubyte *dest, GLint dstRowStride); + +#define EXP5TO8R(packedcol) \ + ((((packedcol) >> 8) & 0xf8) | (((packedcol) >> 13) & 0x7)) + +#define EXP6TO8G(packedcol) \ + ((((packedcol) >> 3) & 0xfc) | (((packedcol) >> 9) & 0x3)) + +#define EXP5TO8B(packedcol) \ + ((((packedcol) << 3) & 0xf8) | (((packedcol) >> 2) & 0x7)) + +#define EXP4TO8(col) \ + ((col) | ((col) << 4)) + +/* inefficient. To be efficient, it would be necessary to decode 16 pixels at once */ + +static void dxt135_decode_imageblock ( const GLubyte *img_block_src, + GLint i, GLint j, GLuint dxt_type, GLvoid *texel ) { + GLchan *rgba = (GLchan *) texel; + const GLushort color0 = img_block_src[0] | (img_block_src[1] << 8); + const GLushort color1 = img_block_src[2] | (img_block_src[3] << 8); + const GLuint bits = img_block_src[4] | (img_block_src[5] << 8) | + (img_block_src[6] << 16) | (img_block_src[7] << 24); + /* What about big/little endian? */ + GLubyte bit_pos = 2 * (j * 4 + i) ; + GLubyte code = (GLubyte) ((bits >> bit_pos) & 3); + + rgba[ACOMP] = CHAN_MAX; + switch (code) { + case 0: + rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color0) ); + rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color0) ); + rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color0) ); + break; + case 1: + rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color1) ); + rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color1) ); + rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color1) ); + break; + case 2: + if ((dxt_type > 1) || (color0 > color1)) { + rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) * 2 + EXP5TO8R(color1)) / 3) ); + rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) * 2 + EXP6TO8G(color1)) / 3) ); + rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) * 2 + EXP5TO8B(color1)) / 3) ); + } + else { + rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1)) / 2) ); + rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1)) / 2) ); + rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1)) / 2) ); + } + break; + case 3: + if ((dxt_type > 1) || (color0 > color1)) { + rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1) * 2) / 3) ); + rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1) * 2) / 3) ); + rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1) * 2) / 3) ); + } + else { + rgba[RCOMP] = 0; + rgba[GCOMP] = 0; + rgba[BCOMP] = 0; + if (dxt_type == 1) rgba[ACOMP] = UBYTE_TO_CHAN(0); + } + break; + default: + /* CANNOT happen (I hope) */ + break; + } +} + + +void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel) +{ + /* Extract the (i,j) pixel from pixdata and return it + * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. + */ + + const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8); + dxt135_decode_imageblock(blksrc, (i&3), (j&3), 0, texel); +} + + +void fetch_2d_texel_rgba_dxt1(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel) +{ + /* Extract the (i,j) pixel from pixdata and return it + * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. + */ + + const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8); + dxt135_decode_imageblock(blksrc, (i&3), (j&3), 1, texel); +} + +void fetch_2d_texel_rgba_dxt3(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel) { + + /* Extract the (i,j) pixel from pixdata and return it + * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. + */ + + GLchan *rgba = (GLchan *) texel; + const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16); +#if 0 + /* Simple 32bit version. */ +/* that's pretty brain-dead for a single pixel, isn't it? */ + const GLubyte bit_pos = 4 * ((j&3) * 4 + (i&3)); + const GLuint alpha_low = blksrc[0] | (blksrc[1] << 8) | (blksrc[2] << 16) | (blksrc[3] << 24); + const GLuint alpha_high = blksrc[4] | (blksrc[5] << 8) | (blksrc[6] << 16) | (blksrc[7] << 24); + + dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); + if (bit_pos < 32) + rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_low >> bit_pos) & 15)) ); + else + rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_high >> (bit_pos - 32)) & 15)) ); +#endif +#if 1 +/* TODO test this! */ + const GLubyte anibble = (blksrc[((j&3) * 4 + (i&3)) / 2] >> (4 * (i&1))) & 0xf; + dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); + rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8(anibble)) ); +#endif + +} + +void fetch_2d_texel_rgba_dxt5(GLint srcRowStride, const GLubyte *pixdata, + GLint i, GLint j, GLvoid *texel) { + + /* Extract the (i,j) pixel from pixdata and return it + * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. + */ + + GLchan *rgba = (GLchan *) texel; + const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16); + const GLubyte alpha0 = blksrc[0]; + const GLubyte alpha1 = blksrc[1]; +#if 0 + const GLubyte bit_pos = 3 * ((j&3) * 4 + (i&3)); + /* simple 32bit version */ + const GLuint bits_low = blksrc[2] | (blksrc[3] << 8) | (blksrc[4] << 16) | (blksrc[5] << 24); + const GLuint bits_high = blksrc[6] | (blksrc[7] << 8); + GLubyte code; + + if (bit_pos < 30) + code = (GLubyte) ((bits_low >> bit_pos) & 7); + else if (bit_pos == 30) + code = (GLubyte) ((bits_low >> 30) & 3) | ((bits_high << 2) & 4); + else + code = (GLubyte) ((bits_high >> (bit_pos - 32)) & 7); +#endif +#if 1 +/* TODO test this! */ + const GLubyte bit_pos = ((j&3) * 4 + (i&3)) * 3; + const GLubyte acodelow = blksrc[2 + bit_pos / 8]; + const GLubyte acodehigh = blksrc[3 + bit_pos / 8]; + const GLubyte code = (acodelow >> (bit_pos & 0x7) | + (acodehigh << (8 - (bit_pos & 0x7)))) & 0x7; +#endif + dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); +#if 0 + if (alpha0 > alpha1) { + switch (code) { + case 0: + rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); + break; + case 1: + rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); + break; + case 2: + case 3: + case 4: + case 5: + case 6: + case 7: + rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) ); + break; + } + } + else { + switch (code) { + case 0: + rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); + break; + case 1: + rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); + break; + case 2: + case 3: + case 4: + case 5: + rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) ); + break; + case 6: + rgba[ACOMP] = 0; + break; + case 7: + rgba[ACOMP] = CHAN_MAX; + break; + } + } +#endif +/* not sure. Which version is faster? */ +#if 1 +/* TODO test this */ + if (code == 0) + rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); + else if (code == 1) + rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); + else if (alpha0 > alpha1) + rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) ); + else if (code < 6) + rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) ); + else if (code == 6) + rgba[ACOMP] = 0; + else + rgba[ACOMP] = CHAN_MAX; +#endif +} + /* weights used for error function, basically weights (unsquared 2/4/1) according to rgb->luminance conversion not sure if this really reflects visual perception */ @@ -839,5 +1080,3 @@ void tx_compress_dxtn(GLint srccomps, GLint width, GLint height, const GLubyte * return; } } - - diff --git a/src/mesa/main/txc_dxtn.h b/src/mesa/main/txc_dxtn.h deleted file mode 100644 index ef352aa..0000000 --- a/src/mesa/main/txc_dxtn.h +++ /dev/null @@ -1,55 +0,0 @@ -/* - * libtxc_dxtn - * Version: 1.0 - * - * Copyright (C) 2004 Roland Scheidegger All Rights Reserved. - * - * 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 - * BRIAN PAUL 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. - */ - -#ifndef _TXC_DXTN_H -#define _TXC_DXTN_H - -#ifdef __APPLE__ -#include -#else -#include -#endif - -typedef GLubyte GLchan; -#define UBYTE_TO_CHAN(b) (b) -#define CHAN_MAX 255 -#define RCOMP 0 -#define GCOMP 1 -#define BCOMP 2 -#define ACOMP 3 - -void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel); -void fetch_2d_texel_rgba_dxt1(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel); -void fetch_2d_texel_rgba_dxt3(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel); -void fetch_2d_texel_rgba_dxt5(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel); - -void tx_compress_dxtn(GLint srccomps, GLint width, GLint height, - const GLubyte *srcPixData, GLenum destformat, - GLubyte *dest, GLint dstRowStride); - -#endif /* _TXC_DXTN_H */ diff --git a/src/mesa/main/txc_fetch_dxtn.c b/src/mesa/main/txc_fetch_dxtn.c deleted file mode 100644 index 7f0db56..0000000 --- a/src/mesa/main/txc_fetch_dxtn.c +++ /dev/null @@ -1,243 +0,0 @@ -/* - * libtxc_dxtn - * Version: 1.0 - * - * Copyright (C) 2004 Roland Scheidegger All Rights Reserved. - * - * 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 - * BRIAN PAUL 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. - */ - -#include -#include "txc_dxtn.h" - -#define EXP5TO8R(packedcol) \ - ((((packedcol) >> 8) & 0xf8) | (((packedcol) >> 13) & 0x7)) - -#define EXP6TO8G(packedcol) \ - ((((packedcol) >> 3) & 0xfc) | (((packedcol) >> 9) & 0x3)) - -#define EXP5TO8B(packedcol) \ - ((((packedcol) << 3) & 0xf8) | (((packedcol) >> 2) & 0x7)) - -#define EXP4TO8(col) \ - ((col) | ((col) << 4)) - -/* inefficient. To be efficient, it would be necessary to decode 16 pixels at once */ - -static void dxt135_decode_imageblock ( const GLubyte *img_block_src, - GLint i, GLint j, GLuint dxt_type, GLvoid *texel ) { - GLchan *rgba = (GLchan *) texel; - const GLushort color0 = img_block_src[0] | (img_block_src[1] << 8); - const GLushort color1 = img_block_src[2] | (img_block_src[3] << 8); - const GLuint bits = img_block_src[4] | (img_block_src[5] << 8) | - (img_block_src[6] << 16) | (img_block_src[7] << 24); - /* What about big/little endian? */ - GLubyte bit_pos = 2 * (j * 4 + i) ; - GLubyte code = (GLubyte) ((bits >> bit_pos) & 3); - - rgba[ACOMP] = CHAN_MAX; - switch (code) { - case 0: - rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color0) ); - rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color0) ); - rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color0) ); - break; - case 1: - rgba[RCOMP] = UBYTE_TO_CHAN( EXP5TO8R(color1) ); - rgba[GCOMP] = UBYTE_TO_CHAN( EXP6TO8G(color1) ); - rgba[BCOMP] = UBYTE_TO_CHAN( EXP5TO8B(color1) ); - break; - case 2: - if ((dxt_type > 1) || (color0 > color1)) { - rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) * 2 + EXP5TO8R(color1)) / 3) ); - rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) * 2 + EXP6TO8G(color1)) / 3) ); - rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) * 2 + EXP5TO8B(color1)) / 3) ); - } - else { - rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1)) / 2) ); - rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1)) / 2) ); - rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1)) / 2) ); - } - break; - case 3: - if ((dxt_type > 1) || (color0 > color1)) { - rgba[RCOMP] = UBYTE_TO_CHAN( ((EXP5TO8R(color0) + EXP5TO8R(color1) * 2) / 3) ); - rgba[GCOMP] = UBYTE_TO_CHAN( ((EXP6TO8G(color0) + EXP6TO8G(color1) * 2) / 3) ); - rgba[BCOMP] = UBYTE_TO_CHAN( ((EXP5TO8B(color0) + EXP5TO8B(color1) * 2) / 3) ); - } - else { - rgba[RCOMP] = 0; - rgba[GCOMP] = 0; - rgba[BCOMP] = 0; - if (dxt_type == 1) rgba[ACOMP] = UBYTE_TO_CHAN(0); - } - break; - default: - /* CANNOT happen (I hope) */ - break; - } -} - - -void fetch_2d_texel_rgb_dxt1(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel) -{ - /* Extract the (i,j) pixel from pixdata and return it - * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. - */ - - const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8); - dxt135_decode_imageblock(blksrc, (i&3), (j&3), 0, texel); -} - - -void fetch_2d_texel_rgba_dxt1(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel) -{ - /* Extract the (i,j) pixel from pixdata and return it - * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. - */ - - const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 8); - dxt135_decode_imageblock(blksrc, (i&3), (j&3), 1, texel); -} - -void fetch_2d_texel_rgba_dxt3(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel) { - - /* Extract the (i,j) pixel from pixdata and return it - * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. - */ - - GLchan *rgba = (GLchan *) texel; - const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16); -#if 0 - /* Simple 32bit version. */ -/* that's pretty brain-dead for a single pixel, isn't it? */ - const GLubyte bit_pos = 4 * ((j&3) * 4 + (i&3)); - const GLuint alpha_low = blksrc[0] | (blksrc[1] << 8) | (blksrc[2] << 16) | (blksrc[3] << 24); - const GLuint alpha_high = blksrc[4] | (blksrc[5] << 8) | (blksrc[6] << 16) | (blksrc[7] << 24); - - dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); - if (bit_pos < 32) - rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_low >> bit_pos) & 15)) ); - else - rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8((alpha_high >> (bit_pos - 32)) & 15)) ); -#endif -#if 1 -/* TODO test this! */ - const GLubyte anibble = (blksrc[((j&3) * 4 + (i&3)) / 2] >> (4 * (i&1))) & 0xf; - dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); - rgba[ACOMP] = UBYTE_TO_CHAN( (GLubyte)(EXP4TO8(anibble)) ); -#endif - -} - -void fetch_2d_texel_rgba_dxt5(GLint srcRowStride, const GLubyte *pixdata, - GLint i, GLint j, GLvoid *texel) { - - /* Extract the (i,j) pixel from pixdata and return it - * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP]. - */ - - GLchan *rgba = (GLchan *) texel; - const GLubyte *blksrc = (pixdata + ((srcRowStride + 3) / 4 * (j / 4) + (i / 4)) * 16); - const GLubyte alpha0 = blksrc[0]; - const GLubyte alpha1 = blksrc[1]; -#if 0 - const GLubyte bit_pos = 3 * ((j&3) * 4 + (i&3)); - /* simple 32bit version */ - const GLuint bits_low = blksrc[2] | (blksrc[3] << 8) | (blksrc[4] << 16) | (blksrc[5] << 24); - const GLuint bits_high = blksrc[6] | (blksrc[7] << 8); - GLubyte code; - - if (bit_pos < 30) - code = (GLubyte) ((bits_low >> bit_pos) & 7); - else if (bit_pos == 30) - code = (GLubyte) ((bits_low >> 30) & 3) | ((bits_high << 2) & 4); - else - code = (GLubyte) ((bits_high >> (bit_pos - 32)) & 7); -#endif -#if 1 -/* TODO test this! */ - const GLubyte bit_pos = ((j&3) * 4 + (i&3)) * 3; - const GLubyte acodelow = blksrc[2 + bit_pos / 8]; - const GLubyte acodehigh = blksrc[3 + bit_pos / 8]; - const GLubyte code = (acodelow >> (bit_pos & 0x7) | - (acodehigh << (8 - (bit_pos & 0x7)))) & 0x7; -#endif - dxt135_decode_imageblock(blksrc + 8, (i&3), (j&3), 2, texel); -#if 0 - if (alpha0 > alpha1) { - switch (code) { - case 0: - rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); - break; - case 1: - rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); - break; - case 2: - case 3: - case 4: - case 5: - case 6: - case 7: - rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) ); - break; - } - } - else { - switch (code) { - case 0: - rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); - break; - case 1: - rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); - break; - case 2: - case 3: - case 4: - case 5: - rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) ); - break; - case 6: - rgba[ACOMP] = 0; - break; - case 7: - rgba[ACOMP] = CHAN_MAX; - break; - } - } -#endif -/* not sure. Which version is faster? */ -#if 1 -/* TODO test this */ - if (code == 0) - rgba[ACOMP] = UBYTE_TO_CHAN( alpha0 ); - else if (code == 1) - rgba[ACOMP] = UBYTE_TO_CHAN( alpha1 ); - else if (alpha0 > alpha1) - rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (8 - code) + (alpha1 * (code - 1))) / 7) ); - else if (code < 6) - rgba[ACOMP] = UBYTE_TO_CHAN( ((alpha0 * (6 - code) + (alpha1 * (code - 1))) / 5) ); - else if (code == 6) - rgba[ACOMP] = 0; - else - rgba[ACOMP] = CHAN_MAX; -#endif -}