From: Rob Clark <robcl...@freedesktop.org>
Because of render-to-alpha (000x) shenanigans, freedreno needs to do
some special handling when rendering to alpha-only formats. And I
noticed that while we had _is_luminance(), _is_intensity(), etc, an
_is_alpha() helper was missing. So fix that.
Signed-off-by: Rob Clark <robcl...@freedesktop.org>
---
src/gallium/auxiliary/util/u_format.c | 17 +++++++++++++++++
src/gallium/auxiliary/util/u_format.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/src/gallium/auxiliary/util/u_format.c
b/src/gallium/auxiliary/util/u_format.c
index d53dd78..c1ce408 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 df31400..621574c 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);
--
1.9.3
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