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7160e09b04
if the view is near the bounds of the fixed point coordinate system. This happens because it rotates the view position around (0,0) according to the current viewangle, so the resultant coordinate may be outside the bounds of fixed point. All important math in this function is now done entirely in floating point. - Fixed: Slopes didn't draw right on 64-bit platforms. SVN r986 (trunk)
128 lines
3.1 KiB
C++
128 lines
3.1 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// DESCRIPTION:
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// Lookup tables.
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// Do not try to look them up :-).
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// In the order of appearance:
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//
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// int finetangent[4096] - Tangens LUT.
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// Should work with BAM fairly well (12 of 16bit,
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// effectively, by shifting).
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//
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// int finesine[10240] - Sine lookup.
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// Guess what, serves as cosine, too.
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// Remarkable thing is, how to use BAMs with this?
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//
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// int tantoangle[2049] - ArcTan LUT,
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// maps tan(angle) to angle fast. Gotta search.
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//
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//-----------------------------------------------------------------------------
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#ifndef __TABLES_H__
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#define __TABLES_H__
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#include <math.h>
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#ifndef PI
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#define PI 3.14159265358979323846 // matches value in gcc v2 math.h
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#endif
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#include "m_fixed.h"
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#define FINEANGLES 8192
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#define FINEMASK (FINEANGLES-1)
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// 0x100000000 to 0x2000
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#define ANGLETOFINESHIFT 19
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// Effective size is 10240.
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extern fixed_t finesine[5*FINEANGLES/4];
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// Re-use data, is just PI/2 phase shift.
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// [RH] Instead of using a pointer, use some inline code
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// (encapsulated in a struct so that we can still use array accesses).
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struct cosine_inline
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{
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fixed_t operator[] (unsigned int x)
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{
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return finesine[x+FINEANGLES/4];
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}
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};
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extern cosine_inline finecosine;
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// Effective size is 4096.
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extern fixed_t finetangent[FINEANGLES/2];
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// Binary Angle Measument, BAM.
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#define ANG45 (0x20000000)
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#define ANG90 (0x40000000)
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#define ANG180 (0x80000000)
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#define ANG270 (0xc0000000)
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#define ANGLE_45 (0x20000000)
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#define ANGLE_90 (0x40000000)
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#define ANGLE_180 (0x80000000)
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#define ANGLE_270 (0xc0000000)
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#define ANGLE_MAX (0xffffffff)
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#define ANGLE_1 (ANGLE_45/45)
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#define ANGLE_60 (ANGLE_180/3)
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#define SLOPERANGE 2048
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#define SLOPEBITS 11
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#define DBITS (FRACBITS-SLOPEBITS)
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typedef uint32 angle_t;
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// Avoid "ambiguous call to overloaded function" errors
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// Only to be used when you have subtracted two angles.
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#ifndef __GNUC__
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inline angle_t abs (angle_t ang)
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{
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return (angle_t)abs((SDWORD)ang);
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}
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#endif
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// Effective size is 2049;
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// The +1 size is to handle the case when x==y
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// without additional checking.
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extern angle_t tantoangle[SLOPERANGE+1];
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// Utility function,
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// called by R_PointToAngle.
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inline int SlopeDiv (unsigned int num, unsigned den)
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{
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unsigned int ans;
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if (den < 512)
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return SLOPERANGE;
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ans = (num << 3) / (den >> 8);
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return ans <= SLOPERANGE ? ans : SLOPERANGE;
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}
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inline double bam2rad(angle_t ang)
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{
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return double(ang >> 1) * (PI / ANGLE_90);
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}
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#endif // __TABLES_H__
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