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mesa: new _mesa_decompress_image() function

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Use the old texture fetch functions to decompress a whole image.
To be used by glGetTexImage().
This commit is contained in:
Brian Paul 2011-09-08 20:16:18 -06:00
parent 9a5b2899e0
commit 3370ba802f
2 changed files with 91 additions and 0 deletions
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86
src/mesa/main/texcompress.c
View file

@ -37,6 +37,9 @@
#include "mfeatures.h"
#include "mtypes.h"
#include "texcompress.h"
#include "texcompress_fxt1.h"
#include "texcompress_rgtc.h"
#include "texcompress_s3tc.h"
/**
@ -438,3 +441,86 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
return (GLubyte *) image + offset;
}
/**
* Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
*/
void
_mesa_decompress_image(gl_format format, GLuint width, GLuint height,
const GLubyte *src, GLint srcRowStride,
GLfloat *dest)
{
void (*fetch)(const struct gl_texture_image *texImage,
GLint i, GLint j, GLint k, GLfloat *texel);
struct gl_texture_image texImage; /* dummy teximage */
GLuint i, j;
/* setup dummy texture image info */
memset(&texImage, 0, sizeof(texImage));
texImage.Data = (void *) src;
texImage.RowStride = srcRowStride;
switch (format) {
/* DXT formats */
case MESA_FORMAT_RGB_DXT1:
fetch = _mesa_fetch_texel_2d_f_rgb_dxt1;
break;
case MESA_FORMAT_RGBA_DXT1:
fetch = _mesa_fetch_texel_2d_f_rgba_dxt1;
break;
case MESA_FORMAT_RGBA_DXT3:
fetch = _mesa_fetch_texel_2d_f_rgba_dxt3;
break;
case MESA_FORMAT_RGBA_DXT5:
fetch = _mesa_fetch_texel_2d_f_rgba_dxt5;
break;
/* FXT1 formats */
case MESA_FORMAT_RGB_FXT1:
fetch = _mesa_fetch_texel_2d_f_rgb_fxt1;
break;
case MESA_FORMAT_RGBA_FXT1:
fetch = _mesa_fetch_texel_2d_f_rgba_fxt1;
break;
/* Red/RG formats */
case MESA_FORMAT_RED_RGTC1:
fetch = _mesa_fetch_texel_2d_f_red_rgtc1;
break;
case MESA_FORMAT_SIGNED_RED_RGTC1:
fetch = _mesa_fetch_texel_2d_f_signed_red_rgtc1;
break;
case MESA_FORMAT_RG_RGTC2:
fetch = _mesa_fetch_texel_2d_f_rg_rgtc2;
break;
case MESA_FORMAT_SIGNED_RG_RGTC2:
fetch = _mesa_fetch_texel_2d_f_signed_rg_rgtc2;
break;
/* L/LA formats */
case MESA_FORMAT_L_LATC1:
fetch = _mesa_fetch_texel_2d_f_l_latc1;
break;
case MESA_FORMAT_SIGNED_L_LATC1:
fetch = _mesa_fetch_texel_2d_f_signed_l_latc1;
break;
case MESA_FORMAT_LA_LATC2:
fetch = _mesa_fetch_texel_2d_f_la_latc2;
break;
case MESA_FORMAT_SIGNED_LA_LATC2:
fetch = _mesa_fetch_texel_2d_f_signed_la_latc2;
break;
default:
_mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()");
return;
}
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) {
fetch(&texImage, i, j, 0, dest);
dest += 4;
}
}
}

5
src/mesa/main/texcompress.h
View file

@ -50,6 +50,11 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
gl_format mesaFormat,
GLsizei width, const GLubyte *image);
extern void
_mesa_decompress_image(gl_format format, GLuint width, GLuint height,
const GLubyte *src, GLint srcRowStride,
GLfloat *dest);
#else /* _HAVE_FULL_GL */
/* no-op macros */