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-rw-r--r--src/gallium/auxiliary/util/u_format.c17
-rw-r--r--src/gallium/auxiliary/util/u_format.h2
2 files changed, 19 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index d53dd7884f0..c1ce408119f 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -92,6 +92,23 @@ util_format_is_luminance(enum pipe_format format)
}
boolean
+util_format_is_alpha(enum pipe_format format)
+{
+ const struct util_format_description *desc =
+ util_format_description(format);
+
+ if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+ desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
+ desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_0 &&
+ desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0 &&
+ desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0 &&
+ desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+boolean
util_format_is_pure_integer(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index df31400af90..621574c9673 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -661,6 +661,8 @@ util_format_has_alpha(enum pipe_format format);
boolean
util_format_is_luminance(enum pipe_format format);
+boolean
+util_format_is_alpha(enum pipe_format format);
boolean
util_format_is_luminance_alpha(enum pipe_format format);