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mesa: faster, simpler is_compressed_format()

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This commit is contained in:
Brian Paul 2010-04-23 11:58:52 -06:00
parent f855193796
commit 3643841079
1 changed files with 24 additions and 18 deletions
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42
src/mesa/main/teximage.c
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@ -358,30 +358,36 @@ _mesa_base_tex_format( GLcontext *ctx, GLint internalFormat )
/**
* Test if it is a supported compressed format.
*
* Test if a texture format is a supported compressed format.
* \param internalFormat the internal format token provided by the user.
*
* \ret GL_TRUE if \p internalFormat is a supported compressed format, or
* GL_FALSE otherwise.
*
* Currently only GL_COMPRESSED_RGB_FXT1_3DFX and GL_COMPRESSED_RGBA_FXT1_3DFX
* are supported.
* \return GL_TRUE if compressed, GL_FALSE if uncompressed
*/
static GLboolean
is_compressed_format(GLcontext *ctx, GLenum internalFormat)
{
GLint supported[100]; /* 100 should be plenty */
GLuint i, n;
n = _mesa_get_compressed_formats(ctx, supported, GL_TRUE);
ASSERT(n < 100);
for (i = 0; i < n; i++) {
if ((GLint) internalFormat == supported[i]) {
return GL_TRUE;
}
switch (internalFormat) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
return ctx->Extensions.EXT_texture_compression_s3tc;
case GL_RGB_S3TC:
case GL_RGB4_S3TC:
case GL_RGBA_S3TC:
case GL_RGBA4_S3TC:
return ctx->Extensions.S3_s3tc;
case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
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 ctx->Extensions.EXT_texture_sRGB
&& ctx->Extensions.EXT_texture_compression_s3tc;
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
return ctx->Extensions.TDFX_texture_compression_FXT1;
default:
return GL_FALSE;
}
return GL_FALSE;
}