From 187b631b6b3c504fa334e33f4b1af433b6232bac Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Wed, 7 Nov 2007 14:40:38 -0700
Subject: [PATCH] Float->uint conversion for PIPE_FORMAT_U_Z32 resulted in
 overflow in depth_value().  Special-case it.

---
 src/mesa/state_tracker/st_cb_clear.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index 2c79e2890d1..cb7e43fb8e9 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -86,7 +86,11 @@ depth_value(GLuint pipeFormat, GLfloat value)
       val = (GLuint) (value * 0xffffff);
       break;
    case PIPE_FORMAT_U_Z32:
-      val = (GLuint) (value * 0xffffffff);
+      /* special-case to avoid overflow */
+      if (value == 1.0)
+         val = 0xffffffff;
+      else
+         val = (GLuint) (value * 0xffffffff);
       break;
    case PIPE_FORMAT_S8_Z24:
    /*case PIPE_FORMAT_Z24_S8:*/
-- 
2.30.2