Mesa (master): util/u_format: Round when converting depth values from float to z16_unorm.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 74f07319533d39a509ddc3159a51cfe89cd47225
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=74f07319533d39a509ddc3159a51cfe89cd47225

Author: José Fonseca <jfonseca at vmware.com>
Date:   Thu Dec 20 12:03:45 2012 +0000

util/u_format: Round when converting depth values from float to z16_unorm.

This makes the z16_unorm -> float -> z16_unorm conversion lossless.

Reviewed-by: Roland Scheidegger <sroland at vmware.com>

---

 src/gallium/auxiliary/util/u_format_zs.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_format_zs.c b/src/gallium/auxiliary/util/u_format_zs.c
index 816ef14..ed45c52 100644
--- a/src/gallium/auxiliary/util/u_format_zs.c
+++ b/src/gallium/auxiliary/util/u_format_zs.c
@@ -72,7 +72,7 @@ static INLINE uint16_t
 z32_float_to_z16_unorm(float z)
 {
    const float scale = 0xffff;
-   return (uint16_t)(z * scale);
+   return (uint16_t)(z * scale + 0.5f);
 }
 
 static INLINE float