From e01d671668a2f618de689e72cce5caf21f57d4a0 Mon Sep 17 00:00:00 2001
From: Daniel Borca <dborca@users.sourceforge.net>
Date: Fri, 12 Dec 2003 08:19:20 +0000
Subject: small bug wrt culling

---
 src/mesa/drivers/glide/fxtris.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/mesa/drivers/glide')

diff --git a/src/mesa/drivers/glide/fxtris.c b/src/mesa/drivers/glide/fxtris.c
index 9be2e1a88f..56563fc412 100644
--- a/src/mesa/drivers/glide/fxtris.c
+++ b/src/mesa/drivers/glide/fxtris.c
@@ -389,9 +389,17 @@ static struct {
 #define VERT_X(_v) _v->x
 #define VERT_Y(_v) _v->y
 #define VERT_Z(_v) _v->ooz
-#define AREA_IS_CCW( a ) IS_NEGATIVE(a) /*(a < 0)*/
 #define GET_VERTEX(e) (fxMesa->verts + e)
 
+#ifdef USE_IEEE
+/* type-punning, keep -fstrict-aliasing happy */
+typedef union { GLfloat f; GLuint u; } fu_type;
+/* 0/1 value, to allow XOR'ing with other booleans */
+#define AREA_IS_CCW( a ) (((fu_type *)&(a))->u >> 31)
+#else
+#define AREA_IS_CCW( a ) (a < 0)
+#endif
+
 #define VERT_SET_RGBA( dst, f )			\
 do {						\
    UNCLAMPED_FLOAT_TO_UBYTE(dst->pargb[2], f[0]);\
-- 
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