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mesa: Add utility function to get base format from a GL compressed format

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Reviewed-by: Brian Paul <brianp@vmware.com>
(cherry picked from commit 09916e877f)
This commit is contained in:
Ian Romanick 2011-07-22 15:25:55 -07:00 • committed by Marek Olšák
parent ad2b567f51
commit a88f4914a3
2 changed files with 91 additions and 0 deletions
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88
src/mesa/main/texcompress.c
View file

@ -39,6 +39,94 @@
#include "texcompress.h"
/**
* Get the GL base format of a specified GL compressed texture format
*
* From page 232 of the OpenGL 3.3 (Compatiblity Profile) spec:
*
* "Compressed Internal Format Base Internal Format Type
* --------------------------- -------------------- ---------
* COMPRESSED_ALPHA ALPHA Generic
* COMPRESSED_LUMINANCE LUMINANCE Generic
* COMPRESSED_LUMINANCE_ALPHA LUMINANCE_ALPHA Generic
* COMPRESSED_INTENSITY INTENSITY Generic
* COMPRESSED_RED RED Generic
* COMPRESSED_RG RG Generic
* COMPRESSED_RGB RGB Generic
* COMPRESSED_RGBA RGBA Generic
* COMPRESSED_SRGB RGB Generic
* COMPRESSED_SRGB_ALPHA RGBA Generic
* COMPRESSED_SLUMINANCE LUMINANCE Generic
* COMPRESSED_SLUMINANCE_ALPHA LUMINANCE_ALPHA Generic
* COMPRESSED_RED_RGTC1 RED Specific
* COMPRESSED_SIGNED_RED_RGTC1 RED Specific
* COMPRESSED_RG_RGTC2 RG Specific
* COMPRESSED_SIGNED_RG_RGTC2 RG Specific"
*
* \return
* The base format of \c format if \c format is a compressed format (either
* generic or specific. Otherwise 0 is returned.
*/
GLenum
_mesa_gl_compressed_format_base_format(GLenum format)
{
switch (format) {
case GL_COMPRESSED_RED:
case GL_COMPRESSED_RED_RGTC1:
case GL_COMPRESSED_SIGNED_RED_RGTC1:
return GL_RED;
case GL_COMPRESSED_RG:
case GL_COMPRESSED_RG_RGTC2:
case GL_COMPRESSED_SIGNED_RG_RGTC2:
return GL_RG;
case GL_COMPRESSED_RGB:
case GL_COMPRESSED_SRGB:
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
return GL_RGB;
case GL_COMPRESSED_RGBA:
case GL_COMPRESSED_SRGB_ALPHA:
case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB:
case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB:
case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB:
case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
return GL_RGBA;
case GL_COMPRESSED_ALPHA:
return GL_ALPHA;
case GL_COMPRESSED_LUMINANCE:
case GL_COMPRESSED_SLUMINANCE:
case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
return GL_LUMINANCE;
case GL_COMPRESSED_LUMINANCE_ALPHA:
case GL_COMPRESSED_SLUMINANCE_ALPHA:
case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
return GL_LUMINANCE_ALPHA;
case GL_COMPRESSED_INTENSITY:
return GL_INTENSITY;
default:
return 0;
}
}
/**
* Return list of (and count of) all specific texture compression
* formats that are supported.

3
src/mesa/main/texcompress.h
View file

@ -33,6 +33,9 @@ struct gl_context;
#if _HAVE_FULL_GL
extern GLenum
_mesa_gl_compressed_format_base_format(GLenum format);
extern GLuint
_mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats, GLboolean all);