The DOOM sources as originally released on December 23, 1997

linuxdoom-1.10/tables.h

@@ -0,0 +1,100 @@
+// Emacs style mode select   -*- C++ -*- 
+//-----------------------------------------------------------------------------
+//
+// $Id:$
+//
+// Copyright (C) 1993-1996 by id Software, Inc.
+//
+// This source is available for distribution and/or modification
+// only under the terms of the DOOM Source Code License as
+// published by id Software. All rights reserved.
+//
+// The source is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
+// for more details.
+//
+// DESCRIPTION:
+//	Lookup tables.
+//	Do not try to look them up :-).
+//	In the order of appearance: 
+//
+//	int finetangent[4096]	- Tangens LUT.
+//	 Should work with BAM fairly well (12 of 16bit,
+//      effectively, by shifting).
+//
+//	int finesine[10240]		- Sine lookup.
+//	 Guess what, serves as cosine, too.
+//	 Remarkable thing is, how to use BAMs with this? 
+//
+//	int tantoangle[2049]	- ArcTan LUT,
+//	  maps tan(angle) to angle fast. Gotta search.	
+//    
+//-----------------------------------------------------------------------------
+
+
+#ifndef __TABLES__
+#define __TABLES__
+
+
+
+#ifdef LINUX
+#include <math.h>
+#else
+#define PI				3.141592657
+#endif
+
+
+#include "m_fixed.h"
+	
+#define FINEANGLES		8192
+#define FINEMASK		(FINEANGLES-1)
+
+
+// 0x100000000 to 0x2000
+#define ANGLETOFINESHIFT	19		
+
+// Effective size is 10240.
+extern  fixed_t		finesine[5*FINEANGLES/4];
+
+// Re-use data, is just PI/2 pahse shift.
+extern  fixed_t*	finecosine;
+
+
+// Effective size is 4096.
+extern fixed_t		finetangent[FINEANGLES/2];
+
+// Binary Angle Measument, BAM.
+#define ANG45			0x20000000
+#define ANG90			0x40000000
+#define ANG180		0x80000000
+#define ANG270		0xc0000000
+
+
+#define SLOPERANGE		2048
+#define SLOPEBITS		11
+#define DBITS			(FRACBITS-SLOPEBITS)
+
+typedef unsigned angle_t;
+
+
+// Effective size is 2049;
+// The +1 size is to handle the case when x==y
+//  without additional checking.
+extern angle_t		tantoangle[SLOPERANGE+1];
+
+
+// Utility function,
+//  called by R_PointToAngle.
+int
+SlopeDiv
+( unsigned	num,
+  unsigned	den);
+
+
+#endif
+//-----------------------------------------------------------------------------
+//
+// $Log:$
+//
+//-----------------------------------------------------------------------------