diff options
Diffstat (limited to 'mesalib/src/mesa/main/texcompress_s3tc.c')
| -rw-r--r-- | mesalib/src/mesa/main/texcompress_s3tc.c | 1120 |
1 files changed, 562 insertions, 558 deletions
diff --git a/mesalib/src/mesa/main/texcompress_s3tc.c b/mesalib/src/mesa/main/texcompress_s3tc.c index 86f962e98..c7b27c1a4 100644 --- a/mesalib/src/mesa/main/texcompress_s3tc.c +++ b/mesalib/src/mesa/main/texcompress_s3tc.c @@ -1,558 +1,562 @@ -/* - * 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 */ +/*
+ * 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)
+#ifdef _DEBUG
+#define DXTN_LIBNAME "dxtn_dbg.dll"
+#else
+#define DXTN_LIBNAME "dxtn.dll"
+#endif
+#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 */
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