From 33f88b3492af1f4f7e78c3688d481f1dee189822 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Wed, 6 Oct 2010 10:09:37 +0100
Subject: [PATCH] util: Cleanup util_pack_z_stencil and friends.

- Handle PIPE_FORMAT_Z32_FLOAT packing correctly.

- In the integer version z shouldn't be passed as as double.

- Make it clear that the integer versions should only be used for masks.

- Make integer type sizes explicit (uint32_t for now, although
  uint64_t will be necessary later to encode f32_s8_x24).
---
 src/gallium/auxiliary/util/u_pack_color.h | 50 +++++++++++++++++--------------
 1 file changed, 28 insertions(+), 22 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_pack_color.h b/src/gallium/auxiliary/util/u_pack_color.h
index c90b0fd..5378f2d 100644
--- a/src/gallium/auxiliary/util/u_pack_color.h
+++ b/src/gallium/auxiliary/util/u_pack_color.h
@@ -434,8 +434,8 @@ util_pack_color(const float rgba[4], enum pipe_format format, union util_color *
 /* Integer versions of util_pack_z and util_pack_z_stencil - useful for
  * constructing clear masks.
  */
-static INLINE uint
-util_pack_uint_z(enum pipe_format format, unsigned z)
+static INLINE uint32_t
+util_pack_mask_z(enum pipe_format format, uint32_t z)
 {
    switch (format) {
    case PIPE_FORMAT_Z16_UNORM:
@@ -452,29 +452,32 @@ util_pack_uint_z(enum pipe_format format, unsigned z)
    case PIPE_FORMAT_S8_USCALED:
       return 0;
    default:
-      debug_print_format("gallium: unhandled format in util_pack_z()", format);
+      debug_print_format("gallium: unhandled format in util_pack_mask_z()", format);
       assert(0);
       return 0;
    }
 }
 
-static INLINE uint
-util_pack_uint_z_stencil(enum pipe_format format, double z, uint s)
+static INLINE uint32_t
+util_pack_mask_z_stencil(enum pipe_format format, uint32_t z, uint8_t s)
 {
-   unsigned packed = util_pack_uint_z(format, z);
-
-   s &= 0xff;
+   uint32_t packed = util_pack_mask_z(format, z);
 
    switch (format) {
    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
-      return packed | (s << 24);
+      packed |= (uint32_t)s << 24;
+      break;
    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
-      return packed | s;
+      packed |= s;
+      break;
    case PIPE_FORMAT_S8_USCALED:
-      return packed | s;
+      packed |= s;
+      break;
    default:
-      return packed;
+      break;
    }
+
+   return packed;
 }
 
 
@@ -482,9 +485,11 @@ util_pack_uint_z_stencil(enum pipe_format format, double z, uint s)
 /**
  * Note: it's assumed that z is in [0,1]
  */
-static INLINE uint
+static INLINE uint32_t
 util_pack_z(enum pipe_format format, double z)
 {
+   union fi fui;
+
    if (z == 0.0)
       return 0;
 
@@ -492,24 +497,25 @@ util_pack_z(enum pipe_format format, double z)
    case PIPE_FORMAT_Z16_UNORM:
       if (z == 1.0)
          return 0xffff;
-      return (uint) (z * 0xffff);
+      return (uint32_t) (z * 0xffff);
    case PIPE_FORMAT_Z32_UNORM:
       /* special-case to avoid overflow */
       if (z == 1.0)
          return 0xffffffff;
-      return (uint) (z * 0xffffffff);
+      return (uint32_t) (z * 0xffffffff);
    case PIPE_FORMAT_Z32_FLOAT:
-      return (uint)z;
+      fui.f = (float)z;
+      return fui.ui;
    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
    case PIPE_FORMAT_Z24X8_UNORM:
       if (z == 1.0)
          return 0xffffff;
-      return (uint) (z * 0xffffff);
+      return (uint32_t) (z * 0xffffff);
    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
    case PIPE_FORMAT_X8Z24_UNORM:
       if (z == 1.0)
          return 0xffffff00;
-      return ((uint) (z * 0xffffff)) << 8;
+      return ((uint32_t) (z * 0xffffff)) << 8;
    case PIPE_FORMAT_S8_USCALED:
       /* this case can get it via util_pack_z_stencil() */
       return 0;
@@ -525,14 +531,14 @@ util_pack_z(enum pipe_format format, double z)
  * Pack Z and/or stencil values into a 32-bit value described by format.
  * Note: it's assumed that z is in [0,1] and s in [0,255]
  */
-static INLINE uint
-util_pack_z_stencil(enum pipe_format format, double z, uint s)
+static INLINE uint32_t
+util_pack_z_stencil(enum pipe_format format, double z, uint8_t s)
 {
-   unsigned packed = util_pack_z(format, z);
+   uint32_t packed = util_pack_z(format, z);
 
    switch (format) {
    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
-      packed |= s << 24;
+      packed |= (uint32_t)s << 24;
       break;
    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
       packed |= s;
-- 
2.7.4