--- ray/src/common/mat4.h	1990/12/15 14:18:18	1.1
+++ ray/src/common/mat4.h	2003/06/07 12:50:20	2.8
@@ -1,18 +1,43 @@
-/* Copyright (c) 1990 Regents of the University of California */
-
-/* SCCSid "$SunId$ LBL" */
-
+/* RCSid $Id: mat4.h,v 2.8 2003/06/07 12:50:20 schorsch Exp $ */
 /*
  * Definitions for 4x4 matrix operations
  */
+#ifndef _RAD_MAT4_H_
+#define _RAD_MAT4_H_
+#ifdef __cplusplus
+extern "C" {
+#endif
 
+#include "copyright.h"
+
+#include  <string.h>
+
 #include  "fvect.h"
 
-typedef double  MAT4[4][4];
+typedef FLOAT  MAT4[4][4];
 
 #ifdef  BSD
-#define  copymat4(m4a,m4b)	bcopy((char *)m4b,(char *)m4a,sizeof(MAT4))
+#define  copymat4(m4a,m4b)	bcopy((void *)m4b,(void *)m4a,sizeof(MAT4))
 #else
-#define  copymat4(m4a,m4b)	(void)memcpy((char *)m4a,(char *)m4b,sizeof(MAT4))
-extern char  *memcpy();
+#define  copymat4(m4a,m4b)	(void)memcpy((void *)m4a,(void *)m4b,sizeof(MAT4))
 #endif
+
+#define  MAT4IDENT		{ {1.,0.,0.,0.}, {0.,1.,0.,0.}, \
+				{0.,0.,1.,0.}, {0.,0.,0.,1.} }
+
+extern MAT4  m4ident;
+
+#define  setident4(m4)		copymat4(m4, m4ident)
+
+
+extern void	multmat4(MAT4 m4a, MAT4 m4b, MAT4 m4c);
+extern void	multv3(FVECT v3a, FVECT v3b, MAT4 m4);
+extern void	multp3(FVECT p3a, FVECT p3b, MAT4 m4);
+extern int	invmat4(MAT4 inverse, MAT4 mat);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _RAD_MAT4_H_ */
+