From f9b1e5241facc8cf255c258082d5cb5b04783e93 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 4 Mar 2003 16:33:53 +0000
Subject: added _mesa_inv_sqrtf() and INV_SQRTF() (Josh Vanderhoof)

---
 src/mesa/main/imports.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/mesa/main/imports.h')

diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 354819f43f..73c3b6eb42 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -1,4 +1,4 @@
-/* $Id: imports.h,v 1.16 2003/03/03 21:44:39 brianp Exp $ */
+/* $Id: imports.h,v 1.17 2003/03/04 16:33:53 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -168,6 +168,16 @@ float asm_sqrt (float x);
 #endif
 
 
+/***
+ *** INV_SQRTF: single-precision inverse square root
+ ***/
+#if 0
+#define INV_SQRTF(X) _mesa_inv_sqrt(X)
+#else
+#define INV_SQRTF(X) (1.0F / SQRTF(X))  /* this is faster on a P4 */
+#endif
+
+
 /***
  *** LOG2: Log base 2 of float
  ***/
@@ -588,6 +598,9 @@ _mesa_sqrtd(double x);
 extern float
 _mesa_sqrtf(float x);
 
+extern float
+_mesa_inv_sqrtf(float x);
+
 extern double
 _mesa_pow(double x, double y);
 
-- 
cgit v1.2.3