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-rw-r--r--src/gallium/include/pipe/p_format.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/src/gallium/include/pipe/p_format.h b/src/gallium/include/pipe/p_format.h
index d9aa5792a44..97a4c8c510b 100644
--- a/src/gallium/include/pipe/p_format.h
+++ b/src/gallium/include/pipe/p_format.h
@@ -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