diff options
Diffstat (limited to 'mesalib/src/mesa/main/texcompress_s3tc.c')
| -rw-r--r-- | mesalib/src/mesa/main/texcompress_s3tc.c | 1132 |
1 files changed, 558 insertions, 574 deletions
diff --git a/mesalib/src/mesa/main/texcompress_s3tc.c b/mesalib/src/mesa/main/texcompress_s3tc.c index 90be6c0a8..86f962e98 100644 --- a/mesalib/src/mesa/main/texcompress_s3tc.c +++ b/mesalib/src/mesa/main/texcompress_s3tc.c @@ -1,574 +1,558 @@ -/*
- * Mesa 3-D graphics library
- * Version: 6.5.3
- *
- * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
- * Copyright (c) 2008 VMware, Inc.
- *
- * 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.
- */
-
-
-/**
- * \file texcompress_s3tc.c
- * GL_EXT_texture_compression_s3tc support.
- */
-
-#ifndef USE_EXTERNAL_DXTN_LIB
-#define USE_EXTERNAL_DXTN_LIB 1
-#endif
-
-#include "glheader.h"
-#include "imports.h"
-#include "colormac.h"
-#include "dlopen.h"
-#include "image.h"
-#include "macros.h"
-#include "mfeatures.h"
-#include "mtypes.h"
-#include "texcompress.h"
-#include "texcompress_s3tc.h"
-#include "texstore.h"
-
-
-#if FEATURE_texture_s3tc
-
-
-#if defined(_WIN32) || defined(WIN32)
-#define DXTN_LIBNAME "dxtn.dll"
-#define RTLD_LAZY 0
-#define RTLD_GLOBAL 0
-#elif defined(__DJGPP__)
-#define DXTN_LIBNAME "dxtn.dxe"
-#else
-#define DXTN_LIBNAME "libtxc_dxtn.so"
-#endif
-
-#if FEATURE_EXT_texture_sRGB
-/**
- * Convert an 8-bit sRGB value from non-linear space to a
- * linear RGB value in [0, 1].
- * Implemented with a 256-entry lookup table.
- */
-static INLINE GLfloat
-nonlinear_to_linear(GLubyte cs8)
-{
- static GLfloat table[256];
- static GLboolean tableReady = GL_FALSE;
- if (!tableReady) {
- /* compute lookup table now */
- GLuint i;
- for (i = 0; i < 256; i++) {
- const GLfloat cs = UBYTE_TO_FLOAT(i);
- if (cs <= 0.04045) {
- table[i] = cs / 12.92f;
- }
- else {
- table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
- }
- }
- tableReady = GL_TRUE;
- }
- return table[cs8];
-}
-#endif /* FEATURE_EXT_texture_sRGB */
-
-typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
-
-dxtFetchTexelFuncExt fetch_ext_rgb_dxt1 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt1 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt3 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt5 = NULL;
-
-typedef void (*dxtCompressTexFuncExt)(GLint srccomps, GLint width,
- GLint height, const GLchan *srcPixData,
- GLenum destformat, GLubyte *dest,
- GLint dstRowStride);
-
-static dxtCompressTexFuncExt ext_tx_compress_dxtn = NULL;
-
-static void *dxtlibhandle = NULL;
-
-
-void
-_mesa_init_texture_s3tc( struct gl_context *ctx )
-{
- /* called during context initialization */
- ctx->Mesa_DXTn = GL_FALSE;
-#if USE_EXTERNAL_DXTN_LIB
- if (!dxtlibhandle) {
- dxtlibhandle = _mesa_dlopen(DXTN_LIBNAME, 0);
- if (!dxtlibhandle) {
- _mesa_warning(ctx, "couldn't open " DXTN_LIBNAME ", software DXTn "
- "compression/decompression unavailable");
- }
- else {
- /* the fetch functions are not per context! Might be problematic... */
- fetch_ext_rgb_dxt1 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgb_dxt1");
- fetch_ext_rgba_dxt1 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt1");
- fetch_ext_rgba_dxt3 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt3");
- fetch_ext_rgba_dxt5 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt5");
- ext_tx_compress_dxtn = (dxtCompressTexFuncExt)
- _mesa_dlsym(dxtlibhandle, "tx_compress_dxtn");
-
- if (!fetch_ext_rgb_dxt1 ||
- !fetch_ext_rgba_dxt1 ||
- !fetch_ext_rgba_dxt3 ||
- !fetch_ext_rgba_dxt5 ||
- !ext_tx_compress_dxtn) {
- _mesa_warning(ctx, "couldn't reference all symbols in "
- DXTN_LIBNAME ", software DXTn compression/decompression "
- "unavailable");
- fetch_ext_rgb_dxt1 = NULL;
- fetch_ext_rgba_dxt1 = NULL;
- fetch_ext_rgba_dxt3 = NULL;
- fetch_ext_rgba_dxt5 = NULL;
- ext_tx_compress_dxtn = NULL;
- _mesa_dlclose(dxtlibhandle);
- dxtlibhandle = NULL;
- }
- }
- }
- if (dxtlibhandle) {
- ctx->Mesa_DXTn = GL_TRUE;
- }
-#else
- (void) ctx;
-#endif
-}
-
-/**
- * Store user's image in rgb_dxt1 format.
- */
-GLboolean
-_mesa_texstore_rgb_dxt1(TEXSTORE_PARAMS)
-{
- const GLchan *pixels;
- GLint srcRowStride;
- GLubyte *dst;
- const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
- const GLchan *tempImage = NULL;
-
- ASSERT(dstFormat == MESA_FORMAT_RGB_DXT1 ||
- dstFormat == MESA_FORMAT_SRGB_DXT1);
- ASSERT(dstXoffset % 4 == 0);
- ASSERT(dstYoffset % 4 == 0);
- ASSERT(dstZoffset % 4 == 0);
- (void) dstZoffset;
- (void) dstImageOffsets;
-
- if (srcFormat != GL_RGB ||
- srcType != CHAN_TYPE ||
- ctx->_ImageTransferState ||
- srcPacking->SwapBytes) {
- /* convert image to RGB/GLchan */
- tempImage = _mesa_make_temp_chan_image(ctx, dims,
- baseInternalFormat,
- _mesa_get_format_base_format(dstFormat),
- srcWidth, srcHeight, srcDepth,
- srcFormat, srcType, srcAddr,
- srcPacking);
- if (!tempImage)
- return GL_FALSE; /* out of memory */
- pixels = tempImage;
- srcRowStride = 3 * srcWidth;
- srcFormat = GL_RGB;
- }
- else {
- pixels = (const GLchan *) srcAddr;
- srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
- srcType) / sizeof(GLchan);
- }
-
- dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
- dstFormat,
- texWidth, (GLubyte *) dstAddr);
-
- if (ext_tx_compress_dxtn) {
- (*ext_tx_compress_dxtn)(3, srcWidth, srcHeight, pixels,
- GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
- dst, dstRowStride);
- }
- else {
- _mesa_warning(ctx, "external dxt library not available: texstore_rgb_dxt1");
- }
-
- if (tempImage)
- free((void *) tempImage);
-
- return GL_TRUE;
-}
-
-
-/**
- * Store user's image in rgba_dxt1 format.
- */
-GLboolean
-_mesa_texstore_rgba_dxt1(TEXSTORE_PARAMS)
-{
- const GLchan *pixels;
- GLint srcRowStride;
- GLubyte *dst;
- const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
- const GLchan *tempImage = NULL;
-
- ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT1 ||
- dstFormat == MESA_FORMAT_SRGBA_DXT1);
- ASSERT(dstXoffset % 4 == 0);
- ASSERT(dstYoffset % 4 == 0);
- ASSERT(dstZoffset % 4 == 0);
- (void) dstZoffset;
- (void) dstImageOffsets;
-
- if (srcFormat != GL_RGBA ||
- srcType != CHAN_TYPE ||
- ctx->_ImageTransferState ||
- srcPacking->SwapBytes) {
- /* convert image to RGBA/GLchan */
- tempImage = _mesa_make_temp_chan_image(ctx, dims,
- baseInternalFormat,
- _mesa_get_format_base_format(dstFormat),
- srcWidth, srcHeight, srcDepth,
- srcFormat, srcType, srcAddr,
- srcPacking);
- if (!tempImage)
- return GL_FALSE; /* out of memory */
- pixels = tempImage;
- srcRowStride = 4 * srcWidth;
- srcFormat = GL_RGBA;
- }
- else {
- pixels = (const GLchan *) srcAddr;
- srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
- srcType) / sizeof(GLchan);
- }
-
- dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
- dstFormat,
- texWidth, (GLubyte *) dstAddr);
- if (ext_tx_compress_dxtn) {
- (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
- GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
- dst, dstRowStride);
- }
- else {
- _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt1");
- }
-
- if (tempImage)
- free((void*) tempImage);
-
- return GL_TRUE;
-}
-
-
-/**
- * Store user's image in rgba_dxt3 format.
- */
-GLboolean
-_mesa_texstore_rgba_dxt3(TEXSTORE_PARAMS)
-{
- const GLchan *pixels;
- GLint srcRowStride;
- GLubyte *dst;
- const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
- const GLchan *tempImage = NULL;
-
- ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT3 ||
- dstFormat == MESA_FORMAT_SRGBA_DXT3);
- ASSERT(dstXoffset % 4 == 0);
- ASSERT(dstYoffset % 4 == 0);
- ASSERT(dstZoffset % 4 == 0);
- (void) dstZoffset;
- (void) dstImageOffsets;
-
- if (srcFormat != GL_RGBA ||
- srcType != CHAN_TYPE ||
- ctx->_ImageTransferState ||
- srcPacking->SwapBytes) {
- /* convert image to RGBA/GLchan */
- tempImage = _mesa_make_temp_chan_image(ctx, dims,
- baseInternalFormat,
- _mesa_get_format_base_format(dstFormat),
- srcWidth, srcHeight, srcDepth,
- srcFormat, srcType, srcAddr,
- srcPacking);
- if (!tempImage)
- return GL_FALSE; /* out of memory */
- pixels = tempImage;
- srcRowStride = 4 * srcWidth;
- }
- else {
- pixels = (const GLchan *) srcAddr;
- srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
- srcType) / sizeof(GLchan);
- }
-
- dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
- dstFormat,
- texWidth, (GLubyte *) dstAddr);
- if (ext_tx_compress_dxtn) {
- (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
- GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
- dst, dstRowStride);
- }
- else {
- _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt3");
- }
-
- if (tempImage)
- free((void *) tempImage);
-
- return GL_TRUE;
-}
-
-
-/**
- * Store user's image in rgba_dxt5 format.
- */
-GLboolean
-_mesa_texstore_rgba_dxt5(TEXSTORE_PARAMS)
-{
- const GLchan *pixels;
- GLint srcRowStride;
- GLubyte *dst;
- const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
- const GLchan *tempImage = NULL;
-
- ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT5 ||
- dstFormat == MESA_FORMAT_SRGBA_DXT5);
- ASSERT(dstXoffset % 4 == 0);
- ASSERT(dstYoffset % 4 == 0);
- ASSERT(dstZoffset % 4 == 0);
- (void) dstZoffset;
- (void) dstImageOffsets;
-
- if (srcFormat != GL_RGBA ||
- srcType != CHAN_TYPE ||
- ctx->_ImageTransferState ||
- srcPacking->SwapBytes) {
- /* convert image to RGBA/GLchan */
- tempImage = _mesa_make_temp_chan_image(ctx, dims,
- baseInternalFormat,
- _mesa_get_format_base_format(dstFormat),
- srcWidth, srcHeight, srcDepth,
- srcFormat, srcType, srcAddr,
- srcPacking);
- if (!tempImage)
- return GL_FALSE; /* out of memory */
- pixels = tempImage;
- srcRowStride = 4 * srcWidth;
- }
- else {
- pixels = (const GLchan *) srcAddr;
- srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
- srcType) / sizeof(GLchan);
- }
-
- dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
- dstFormat,
- texWidth, (GLubyte *) dstAddr);
- if (ext_tx_compress_dxtn) {
- (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
- GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
- dst, dstRowStride);
- }
- else {
- _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt5");
- }
-
- if (tempImage)
- free((void *) tempImage);
-
- return GL_TRUE;
-}
-
-
-static void
-fetch_texel_2d_rgb_dxt1( const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLchan *texel )
-{
- (void) k;
- if (fetch_ext_rgb_dxt1) {
- ASSERT (sizeof(GLchan) == sizeof(GLubyte));
- fetch_ext_rgb_dxt1(texImage->RowStride,
- (GLubyte *)(texImage)->Data, i, j, texel);
- }
- else
- _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgb_dxt1");
-}
-
-
-void
-_mesa_fetch_texel_2d_f_rgb_dxt1(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba);
- texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
- texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
- texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-
-static void
-fetch_texel_2d_rgba_dxt1( const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLchan *texel )
-{
- (void) k;
- if (fetch_ext_rgba_dxt1) {
- fetch_ext_rgba_dxt1(texImage->RowStride,
- (GLubyte *)(texImage)->Data, i, j, texel);
- }
- else
- _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt1\n");
-}
-
-
-void
-_mesa_fetch_texel_2d_f_rgba_dxt1(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba);
- texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
- texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
- texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-
-static void
-fetch_texel_2d_rgba_dxt3( const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLchan *texel )
-{
- (void) k;
- if (fetch_ext_rgba_dxt3) {
- ASSERT (sizeof(GLchan) == sizeof(GLubyte));
- fetch_ext_rgba_dxt3(texImage->RowStride, (GLubyte *)(texImage)->Data,
- i, j, texel);
- }
- else
- _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt3\n");
-}
-
-
-void
-_mesa_fetch_texel_2d_f_rgba_dxt3(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba);
- texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
- texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
- texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-
-static void
-fetch_texel_2d_rgba_dxt5( const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLchan *texel )
-{
- (void) k;
- if (fetch_ext_rgba_dxt5) {
- fetch_ext_rgba_dxt5(texImage->RowStride, (GLubyte *)(texImage)->Data,
- i, j, texel);
- }
- else
- _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt5\n");
-}
-
-
-void
-_mesa_fetch_texel_2d_f_rgba_dxt5(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba);
- texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
- texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
- texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-#if FEATURE_EXT_texture_sRGB
-void
-_mesa_fetch_texel_2d_f_srgb_dxt1( const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel )
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba);
- texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
- texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
- texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-void
-_mesa_fetch_texel_2d_f_srgba_dxt1(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba);
- texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
- texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
- texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-void
-_mesa_fetch_texel_2d_f_srgba_dxt3(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba);
- texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
- texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
- texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-
-void
-_mesa_fetch_texel_2d_f_srgba_dxt5(const struct gl_texture_image *texImage,
- GLint i, GLint j, GLint k, GLfloat *texel)
-{
- /* just sample as GLchan and convert to float here */
- GLchan rgba[4];
- fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba);
- texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
- texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
- texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
- texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
-}
-#endif /* FEATURE_EXT_texture_sRGB */
-
-
-#endif /* FEATURE_texture_s3tc */
+/* + * Mesa 3-D graphics library + * Version: 6.5.3 + * + * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. + * Copyright (c) 2008 VMware, Inc. + * + * 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. + */ + + +/** + * \file texcompress_s3tc.c + * GL_EXT_texture_compression_s3tc support. + */ + +#ifndef USE_EXTERNAL_DXTN_LIB +#define USE_EXTERNAL_DXTN_LIB 1 +#endif + +#include "glheader.h" +#include "imports.h" +#include "colormac.h" +#include "dlopen.h" +#include "image.h" +#include "macros.h" +#include "mfeatures.h" +#include "mtypes.h" +#include "texcompress.h" +#include "texcompress_s3tc.h" +#include "texstore.h" + + +#if FEATURE_texture_s3tc + + +#if defined(_WIN32) || defined(WIN32) +#define DXTN_LIBNAME "dxtn.dll" +#define RTLD_LAZY 0 +#define RTLD_GLOBAL 0 +#elif defined(__DJGPP__) +#define DXTN_LIBNAME "dxtn.dxe" +#else +#define DXTN_LIBNAME "libtxc_dxtn.so" +#endif + +#if FEATURE_EXT_texture_sRGB +/** + * Convert an 8-bit sRGB value from non-linear space to a + * linear RGB value in [0, 1]. + * Implemented with a 256-entry lookup table. + */ +static INLINE GLfloat +nonlinear_to_linear(GLubyte cs8) +{ + static GLfloat table[256]; + static GLboolean tableReady = GL_FALSE; + if (!tableReady) { + /* compute lookup table now */ + GLuint i; + for (i = 0; i < 256; i++) { + const GLfloat cs = UBYTE_TO_FLOAT(i); + if (cs <= 0.04045) { + table[i] = cs / 12.92f; + } + else { + table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4); + } + } + tableReady = GL_TRUE; + } + return table[cs8]; +} +#endif /* FEATURE_EXT_texture_sRGB */ + +typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut ); + +dxtFetchTexelFuncExt fetch_ext_rgb_dxt1 = NULL; +dxtFetchTexelFuncExt fetch_ext_rgba_dxt1 = NULL; +dxtFetchTexelFuncExt fetch_ext_rgba_dxt3 = NULL; +dxtFetchTexelFuncExt fetch_ext_rgba_dxt5 = NULL; + +typedef void (*dxtCompressTexFuncExt)(GLint srccomps, GLint width, + GLint height, const GLchan *srcPixData, + GLenum destformat, GLubyte *dest, + GLint dstRowStride); + +static dxtCompressTexFuncExt ext_tx_compress_dxtn = NULL; + +static void *dxtlibhandle = NULL; + + +void +_mesa_init_texture_s3tc( struct gl_context *ctx ) +{ + /* called during context initialization */ + ctx->Mesa_DXTn = GL_FALSE; +#if USE_EXTERNAL_DXTN_LIB + if (!dxtlibhandle) { + dxtlibhandle = _mesa_dlopen(DXTN_LIBNAME, 0); + if (!dxtlibhandle) { + _mesa_warning(ctx, "couldn't open " DXTN_LIBNAME ", software DXTn " + "compression/decompression unavailable"); + } + else { + /* the fetch functions are not per context! Might be problematic... */ + fetch_ext_rgb_dxt1 = (dxtFetchTexelFuncExt) + _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgb_dxt1"); + fetch_ext_rgba_dxt1 = (dxtFetchTexelFuncExt) + _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt1"); + fetch_ext_rgba_dxt3 = (dxtFetchTexelFuncExt) + _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt3"); + fetch_ext_rgba_dxt5 = (dxtFetchTexelFuncExt) + _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt5"); + ext_tx_compress_dxtn = (dxtCompressTexFuncExt) + _mesa_dlsym(dxtlibhandle, "tx_compress_dxtn"); + + if (!fetch_ext_rgb_dxt1 || + !fetch_ext_rgba_dxt1 || + !fetch_ext_rgba_dxt3 || + !fetch_ext_rgba_dxt5 || + !ext_tx_compress_dxtn) { + _mesa_warning(ctx, "couldn't reference all symbols in " + DXTN_LIBNAME ", software DXTn compression/decompression " + "unavailable"); + fetch_ext_rgb_dxt1 = NULL; + fetch_ext_rgba_dxt1 = NULL; + fetch_ext_rgba_dxt3 = NULL; + fetch_ext_rgba_dxt5 = NULL; + ext_tx_compress_dxtn = NULL; + _mesa_dlclose(dxtlibhandle); + dxtlibhandle = NULL; + } + } + } + if (dxtlibhandle) { + ctx->Mesa_DXTn = GL_TRUE; + } +#else + (void) ctx; +#endif +} + +/** + * Store user's image in rgb_dxt1 format. + */ +GLboolean +_mesa_texstore_rgb_dxt1(TEXSTORE_PARAMS) +{ + const GLchan *pixels; + GLubyte *dst; + const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */ + const GLchan *tempImage = NULL; + + ASSERT(dstFormat == MESA_FORMAT_RGB_DXT1 || + dstFormat == MESA_FORMAT_SRGB_DXT1); + ASSERT(dstXoffset % 4 == 0); + ASSERT(dstYoffset % 4 == 0); + ASSERT(dstZoffset % 4 == 0); + (void) dstZoffset; + (void) dstImageOffsets; + + if (srcFormat != GL_RGB || + srcType != CHAN_TYPE || + ctx->_ImageTransferState || + srcPacking->SwapBytes) { + /* convert image to RGB/GLchan */ + tempImage = _mesa_make_temp_chan_image(ctx, dims, + baseInternalFormat, + _mesa_get_format_base_format(dstFormat), + srcWidth, srcHeight, srcDepth, + srcFormat, srcType, srcAddr, + srcPacking); + if (!tempImage) + return GL_FALSE; /* out of memory */ + pixels = tempImage; + srcFormat = GL_RGB; + } + else { + pixels = (const GLchan *) srcAddr; + } + + dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0, + dstFormat, + texWidth, (GLubyte *) dstAddr); + + if (ext_tx_compress_dxtn) { + (*ext_tx_compress_dxtn)(3, srcWidth, srcHeight, pixels, + GL_COMPRESSED_RGB_S3TC_DXT1_EXT, + dst, dstRowStride); + } + else { + _mesa_warning(ctx, "external dxt library not available: texstore_rgb_dxt1"); + } + + if (tempImage) + free((void *) tempImage); + + return GL_TRUE; +} + + +/** + * Store user's image in rgba_dxt1 format. + */ +GLboolean +_mesa_texstore_rgba_dxt1(TEXSTORE_PARAMS) +{ + const GLchan *pixels; + GLubyte *dst; + const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */ + const GLchan *tempImage = NULL; + + ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT1 || + dstFormat == MESA_FORMAT_SRGBA_DXT1); + ASSERT(dstXoffset % 4 == 0); + ASSERT(dstYoffset % 4 == 0); + ASSERT(dstZoffset % 4 == 0); + (void) dstZoffset; + (void) dstImageOffsets; + + if (srcFormat != GL_RGBA || + srcType != CHAN_TYPE || + ctx->_ImageTransferState || + srcPacking->SwapBytes) { + /* convert image to RGBA/GLchan */ + tempImage = _mesa_make_temp_chan_image(ctx, dims, + baseInternalFormat, + _mesa_get_format_base_format(dstFormat), + srcWidth, srcHeight, srcDepth, + srcFormat, srcType, srcAddr, + srcPacking); + if (!tempImage) + return GL_FALSE; /* out of memory */ + pixels = tempImage; + srcFormat = GL_RGBA; + } + else { + pixels = (const GLchan *) srcAddr; + } + + dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0, + dstFormat, + texWidth, (GLubyte *) dstAddr); + if (ext_tx_compress_dxtn) { + (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels, + GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, + dst, dstRowStride); + } + else { + _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt1"); + } + + if (tempImage) + free((void*) tempImage); + + return GL_TRUE; +} + + +/** + * Store user's image in rgba_dxt3 format. + */ +GLboolean +_mesa_texstore_rgba_dxt3(TEXSTORE_PARAMS) +{ + const GLchan *pixels; + GLubyte *dst; + const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */ + const GLchan *tempImage = NULL; + + ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT3 || + dstFormat == MESA_FORMAT_SRGBA_DXT3); + ASSERT(dstXoffset % 4 == 0); + ASSERT(dstYoffset % 4 == 0); + ASSERT(dstZoffset % 4 == 0); + (void) dstZoffset; + (void) dstImageOffsets; + + if (srcFormat != GL_RGBA || + srcType != CHAN_TYPE || + ctx->_ImageTransferState || + srcPacking->SwapBytes) { + /* convert image to RGBA/GLchan */ + tempImage = _mesa_make_temp_chan_image(ctx, dims, + baseInternalFormat, + _mesa_get_format_base_format(dstFormat), + srcWidth, srcHeight, srcDepth, + srcFormat, srcType, srcAddr, + srcPacking); + if (!tempImage) + return GL_FALSE; /* out of memory */ + pixels = tempImage; + } + else { + pixels = (const GLchan *) srcAddr; + } + + dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0, + dstFormat, + texWidth, (GLubyte *) dstAddr); + if (ext_tx_compress_dxtn) { + (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels, + GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, + dst, dstRowStride); + } + else { + _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt3"); + } + + if (tempImage) + free((void *) tempImage); + + return GL_TRUE; +} + + +/** + * Store user's image in rgba_dxt5 format. + */ +GLboolean +_mesa_texstore_rgba_dxt5(TEXSTORE_PARAMS) +{ + const GLchan *pixels; + GLubyte *dst; + const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */ + const GLchan *tempImage = NULL; + + ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT5 || + dstFormat == MESA_FORMAT_SRGBA_DXT5); + ASSERT(dstXoffset % 4 == 0); + ASSERT(dstYoffset % 4 == 0); + ASSERT(dstZoffset % 4 == 0); + (void) dstZoffset; + (void) dstImageOffsets; + + if (srcFormat != GL_RGBA || + srcType != CHAN_TYPE || + ctx->_ImageTransferState || + srcPacking->SwapBytes) { + /* convert image to RGBA/GLchan */ + tempImage = _mesa_make_temp_chan_image(ctx, dims, + baseInternalFormat, + _mesa_get_format_base_format(dstFormat), + srcWidth, srcHeight, srcDepth, + srcFormat, srcType, srcAddr, + srcPacking); + if (!tempImage) + return GL_FALSE; /* out of memory */ + pixels = tempImage; + } + else { + pixels = (const GLchan *) srcAddr; + } + + dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0, + dstFormat, + texWidth, (GLubyte *) dstAddr); + if (ext_tx_compress_dxtn) { + (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels, + GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, + dst, dstRowStride); + } + else { + _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt5"); + } + + if (tempImage) + free((void *) tempImage); + + return GL_TRUE; +} + + +static void +fetch_texel_2d_rgb_dxt1( const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLchan *texel ) +{ + (void) k; + if (fetch_ext_rgb_dxt1) { + ASSERT (sizeof(GLchan) == sizeof(GLubyte)); + fetch_ext_rgb_dxt1(texImage->RowStride, + (GLubyte *)(texImage)->Data, i, j, texel); + } + else + _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgb_dxt1"); +} + + +void +_mesa_fetch_texel_2d_f_rgb_dxt1(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba); + texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]); + texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]); + texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + + +static void +fetch_texel_2d_rgba_dxt1( const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLchan *texel ) +{ + (void) k; + if (fetch_ext_rgba_dxt1) { + fetch_ext_rgba_dxt1(texImage->RowStride, + (GLubyte *)(texImage)->Data, i, j, texel); + } + else + _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt1\n"); +} + + +void +_mesa_fetch_texel_2d_f_rgba_dxt1(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba); + texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]); + texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]); + texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + + +static void +fetch_texel_2d_rgba_dxt3( const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLchan *texel ) +{ + (void) k; + if (fetch_ext_rgba_dxt3) { + ASSERT (sizeof(GLchan) == sizeof(GLubyte)); + fetch_ext_rgba_dxt3(texImage->RowStride, (GLubyte *)(texImage)->Data, + i, j, texel); + } + else + _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt3\n"); +} + + +void +_mesa_fetch_texel_2d_f_rgba_dxt3(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba); + texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]); + texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]); + texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + + +static void +fetch_texel_2d_rgba_dxt5( const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLchan *texel ) +{ + (void) k; + if (fetch_ext_rgba_dxt5) { + fetch_ext_rgba_dxt5(texImage->RowStride, (GLubyte *)(texImage)->Data, + i, j, texel); + } + else + _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt5\n"); +} + + +void +_mesa_fetch_texel_2d_f_rgba_dxt5(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba); + texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]); + texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]); + texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + +#if FEATURE_EXT_texture_sRGB +void +_mesa_fetch_texel_2d_f_srgb_dxt1( const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel ) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba); + texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]); + texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]); + texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + +void +_mesa_fetch_texel_2d_f_srgba_dxt1(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba); + texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]); + texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]); + texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + +void +_mesa_fetch_texel_2d_f_srgba_dxt3(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba); + texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]); + texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]); + texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} + +void +_mesa_fetch_texel_2d_f_srgba_dxt5(const struct gl_texture_image *texImage, + GLint i, GLint j, GLint k, GLfloat *texel) +{ + /* just sample as GLchan and convert to float here */ + GLchan rgba[4]; + fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba); + texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]); + texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]); + texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]); + texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]); +} +#endif /* FEATURE_EXT_texture_sRGB */ + + +#endif /* FEATURE_texture_s3tc */ |