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gallium: New pf_has_alpha utility function.

This commit is contained in:
José Fonseca 2008-09-05 10:26:30 +09:00
parent 46efe73daf
commit 53979d0a35
1 changed files with 29 additions and 0 deletions
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29
src/gallium/include/pipe/p_format.h
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@ -531,6 +531,35 @@ pf_is_ycbcr( enum pipe_format format )
return pf_layout(format) == PIPE_FORMAT_LAYOUT_YCBCR ? TRUE : FALSE;
}
static INLINE boolean
pf_has_alpha( enum pipe_format format )
{
switch (pf_layout(format)) {
case PIPE_FORMAT_LAYOUT_RGBAZS:
case PIPE_FORMAT_LAYOUT_MIXED:
/* FIXME: pf_get_component_bits( PIPE_FORMAT_A8L8_UNORM, PIPE_FORMAT_COMP_A ) should not return 0 right? */
if(format == PIPE_FORMAT_A8_UNORM ||
format == PIPE_FORMAT_A8L8_UNORM ||
format == PIPE_FORMAT_A8_L8_SRGB)
return TRUE;
return pf_get_component_bits( format, PIPE_FORMAT_COMP_A ) ? TRUE : FALSE;
case PIPE_FORMAT_LAYOUT_YCBCR:
return FALSE;
case PIPE_FORMAT_LAYOUT_DXT:
switch (format) {
case PIPE_FORMAT_DXT1_RGBA:
case PIPE_FORMAT_DXT3_RGBA:
case PIPE_FORMAT_DXT5_RGBA:
return TRUE;
default:
return FALSE;
}
default:
assert( 0 );
return FALSE;
}
}
#ifdef __cplusplus
}
#endif