📄 texcompress_s3tc.c
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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,
GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
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_problem(ctx, "external dxt library not available");
}
if (tempImage)
_mesa_free((void *) tempImage);
return GL_TRUE;
}
/**
* Called via TexFormat->StoreImage to store an RGBA_DXT5 texture.
*/
static GLboolean
texstore_rgba_dxt5(STORE_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_texformat_rgba_dxt5);
ASSERT(dstXoffset % 4 == 0);
ASSERT(dstYoffset % 4 == 0);
ASSERT(dstZoffset % 4 == 0);
(void) dstZoffset; (void) dstImageStride;
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,
dstFormat->BaseFormat,
srcWidth, srcHeight, srcDepth,
srcFormat, srcType, srcAddr,
srcPacking);
if (!tempImage)
return GL_FALSE; /* out of memory */
_mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
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,
GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
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_problem(ctx, "external dxt library not available");
}
if (tempImage)
_mesa_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\n");
}
static void
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] = {0, 0, 0, 0};
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\n");
}
static void
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] = {0, 0, 0, 0};
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\n");
}
static void
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] = {0, 0, 0, 0};
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\n");
}
static void
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] = {0, 0, 0, 0};
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]);
}
const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
MESA_FORMAT_RGB_DXT1, /* MesaFormat */
GL_RGB, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4, /*approx*/ /* RedBits */
4, /*approx*/ /* GreenBits */
4, /*approx*/ /* BlueBits */
0, /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
0, /* TexelBytes */
texstore_rgb_dxt1, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
fetch_texel_2d_rgb_dxt1, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
fetch_texel_2d_f_rgb_dxt1, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
};
const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
MESA_FORMAT_RGBA_DXT1, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4, /*approx*/ /* RedBits */
4, /*approx*/ /* GreenBits */
4, /*approx*/ /* BlueBits */
1, /*approx*/ /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
0, /* TexelBytes */
texstore_rgba_dxt1, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
fetch_texel_2d_rgba_dxt1, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
fetch_texel_2d_f_rgba_dxt1, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
};
const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
MESA_FORMAT_RGBA_DXT3, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4, /*approx*/ /* RedBits */
4, /*approx*/ /* GreenBits */
4, /*approx*/ /* BlueBits */
4, /*approx*/ /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
0, /* TexelBytes */
texstore_rgba_dxt3, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
fetch_texel_2d_rgba_dxt3, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
fetch_texel_2d_f_rgba_dxt3, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
};
const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
MESA_FORMAT_RGBA_DXT5, /* MesaFormat */
GL_RGBA, /* BaseFormat */
GL_UNSIGNED_NORMALIZED_ARB, /* DataType */
4,/*approx*/ /* RedBits */
4,/*approx*/ /* GreenBits */
4,/*approx*/ /* BlueBits */
4,/*approx*/ /* AlphaBits */
0, /* LuminanceBits */
0, /* IntensityBits */
0, /* IndexBits */
0, /* DepthBits */
0, /* TexelBytes */
texstore_rgba_dxt5, /* StoreTexImageFunc */
NULL, /*impossible*/ /* FetchTexel1D */
fetch_texel_2d_rgba_dxt5, /* FetchTexel2D */
NULL, /*impossible*/ /* FetchTexel3D */
NULL, /*impossible*/ /* FetchTexel1Df */
fetch_texel_2d_f_rgba_dxt5, /* FetchTexel2Df */
NULL, /*impossible*/ /* FetchTexel3Df */
};
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