From 8d62b2aca99ba67f794dd682ed1ec49dc8826390 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Wed, 2 Mar 2011 14:34:14 +1000
Subject: gallium: add RGTC UNORM support to u_format.

SNORM needs a bit of work in the state tracker in order for mipmap
generation to work I believe.

I'm also not sure that having unorm fetches for an snorm format is
sane.
---
 src/gallium/auxiliary/util/u_math.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/gallium/auxiliary/util/u_math.h')

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 30555f92a6..e3d4c06b6f 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -475,6 +475,17 @@ float_to_ubyte(float f)
    }
 }
 
+static INLINE float
+byte_to_float_tex(int8_t b)
+{
+   return (b == -128) ? -1.0F : b * 1.0F / 127.0F;
+}
+
+static INLINE int8_t
+float_to_byte_tex(float f)
+{
+   return (int8_t) (127.0F * f);
+}
 
 /**
  * Calc log base 2
-- 
cgit v1.2.3