1 files changed, 117 insertions, 0 deletions
diff --git a/src/mesa/pipe/p_util.h b/src/mesa/pipe/p_util.h
new file mode 100644
index 0000000000..979befb194
--- /dev/null
+++ b/src/mesa/pipe/p_util.h
@@ -0,0 +1,117 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5.2
+ *
+ * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#ifndef P_UTIL_H
+#define P_UTIL_H
+
+#include "p_compiler.h"
+
+#define CALLOC_STRUCT(T)   (struct T *) calloc(1, sizeof(struct T))
+
+
+
+/** Clamp X to [MIN,MAX] */
+#define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
+
+/** Assign X to CLAMP(X, MIN, MAX) */
+#define CLAMP_SELF(x, mn, mx)  \
+   ( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
+
+/** Minimum of two values: */
+#define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
+
+/** Maximum of two values: */
+#define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
+
+
+#define Elements(x) sizeof(x)/sizeof(*(x))
+
+union fi {
+   float f;
+   int i;
+   unsigned ui;
+};
+
+#define UBYTE_TO_FLOAT( ub ) ((float)(ub) / 255.0F)
+
+#define IEEE_0996 0x3f7f0000	/* 0.996 or so */
+
+/* This function/macro is sensitive to precision.  Test very carefully
+ * if you change it!
+ */
+#define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)					\
+        do {								\
+           union fi __tmp;						\
+           __tmp.f = (F);						\
+           if (__tmp.i < 0)						\
+              UB = (ubyte) 0;						\
+           else if (__tmp.i >= IEEE_0996)				\
+              UB = (ubyte) 255;					\
+           else {							\
+              __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F;		\
+              UB = (ubyte) __tmp.i;					\
+           }								\
+        } while (0)
+
+
+
+static INLINE unsigned pack_ub4( unsigned char b0,
+				 unsigned char b1,
+				 unsigned char b2,
+				 unsigned char b3 )
+{
+   return ((((unsigned int)b0) << 0) |
+	   (((unsigned int)b1) << 8) |
+	   (((unsigned int)b2) << 16) |
+	   (((unsigned int)b3) << 24));
+}
+
+static INLINE unsigned fui( float f )
+{
+   union fi fi;
+   fi.f = f;
+   return fi.ui;
+}
+
+static INLINE unsigned char float_to_ubyte( float f )
+{
+   unsigned char ub;
+   UNCLAMPED_FLOAT_TO_UBYTE(ub, f);
+   return ub;
+}
+
+static INLINE unsigned pack_ui32_float4( float a,
+					 float b, 
+					 float d, 
+					 float c )
+{
+   return pack_ub4( float_to_ubyte(a),
+		    float_to_ubyte(b),
+		    float_to_ubyte(c),
+		    float_to_ubyte(d) );
+}
+
+#endif