0,0 → 1,572 |
/* |
* 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. |
*/ |
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|
/** |
* \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 "texcompress.h" |
#include "texcompress_s3tc.h" |
#include "texstore.h" |
|
|
#if FEATURE_texture_s3tc |
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|
#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; |
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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; |
} |
|
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/** |
* 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; |
} |
|
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/** |
* 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; |
} |
|
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/** |
* 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; |
} |
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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"); |
} |
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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]); |
} |
|
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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"); |
} |
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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]); |
} |
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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"); |
} |
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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]); |
} |
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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"); |
} |
|
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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 */ |