From: Brian Paul <bri...@vmware.com>
---
src/gallium/auxiliary/util/u_format.c | 94 +++++++++++++++++++++++++++++++++
src/gallium/auxiliary/util/u_format.h | 16 ++++++
2 files changed, 110 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_format.c
b/src/gallium/auxiliary/util/u_format.c
index 34922ab..a31634c 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -67,6 +67,100 @@ util_format_is_float(enum pipe_format format)
}
+/**
+ * Return the number of logical channels in the given format by
+ * examining swizzles.
+ * XXX this could be made into a public function if useful elsewhere.
+ */
+static unsigned
+nr_logical_channels(const struct util_format_description *desc)
+{
+ boolean swizzle_used[UTIL_FORMAT_SWIZZLE_NONE + 1];
+
+ memset(swizzle_used, 0, sizeof(swizzle_used));
+
+ swizzle_used[desc->swizzle[0]] = TRUE;
+ swizzle_used[desc->swizzle[1]] = TRUE;
+ swizzle_used[desc->swizzle[2]] = TRUE;
+ swizzle_used[desc->swizzle[3]] = TRUE;
+
+ return (swizzle_used[UTIL_FORMAT_SWIZZLE_X] +
+ swizzle_used[UTIL_FORMAT_SWIZZLE_Y] +
+ swizzle_used[UTIL_FORMAT_SWIZZLE_Z] +
+ swizzle_used[UTIL_FORMAT_SWIZZLE_W]);
+}
+
+
+/** Test if the format contains RGB, but not alpha */
+boolean
+util_format_is_rgb_no_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) &&
+ nr_logical_channels(desc) == 3) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+
+boolean
+util_format_is_luminance(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_X &&
+ desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+
+boolean
+util_format_is_luminance_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_X &&
+ desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+
+boolean
+util_format_is_intensity(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_X &&
+ desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+ desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+
boolean
util_format_is_supported(enum pipe_format format, unsigned bind)
{
diff --git a/src/gallium/auxiliary/util/u_format.h
b/src/gallium/auxiliary/util/u_format.h
index 3527103..991dbc3 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -477,6 +477,22 @@ boolean
util_format_is_float(enum pipe_format format);
+boolean
+util_format_is_rgb_no_alpha(enum pipe_format format);
+
+
+boolean
+util_format_is_luminance(enum pipe_format format);
+
+
+boolean
+util_format_is_luminance_alpha(enum pipe_format format);
+
+
+boolean
+util_format_is_intensity(enum pipe_format format);
+
+
/**
* Whether the src format can be blitted to destation format with a simple
* memcpy.
--
1.7.3.4
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