Mesa (master): util/format: add helper util_format_is_snorm8

[Marek Olšák]

Module: Mesa
Branch: master
Commit: e1c098f2381de53bd0a3260d330b057c8bfb3156
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e1c098f2381de53bd0a3260d330b057c8bfb3156

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Thu Oct 22 23:32:16 2015 +0200

util/format: add helper util_format_is_snorm8

Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>

---

 src/gallium/auxiliary/util/u_format.c |   19 +++++++++++++++++++
 src/gallium/auxiliary/util/u_format.h |    3 +++
 2 files changed, 22 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index c1ce408..79630bf 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -170,6 +170,25 @@ util_format_is_snorm(enum pipe_format format)
 }
 
 boolean
+util_format_is_snorm8(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   int i;
+
+   if (desc->is_mixed)
+      return FALSE;
+
+   i = util_format_get_first_non_void_channel(format);
+   if (i == -1)
+      return FALSE;
+
+   return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&
+          !desc->channel[i].pure_integer &&
+          desc->channel[i].normalized &&
+          desc->channel[i].size == 8;
+}
+
+boolean
 util_format_is_luminance_alpha(enum pipe_format format)
 {
    const struct util_format_description *desc =
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 42b39ff..a1b1b28 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -686,6 +686,9 @@ util_format_is_pure_uint(enum pipe_format format);
 boolean
 util_format_is_snorm(enum pipe_format format);
 
+boolean
+util_format_is_snorm8(enum pipe_format format);
+
 /**
  * Check if the src format can be blitted to the destination format with
  * a simple memcpy.  For example, blitting from RGBA to RGBx is OK, but not