mirror of
https://github.com/kevinbentley/Descent3.git
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121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*
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* $Logfile: /DescentIII/Main/Lib/fix.h $
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* $Revision: 4 $
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* $Date: 10/21/99 9:27p $
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* $Author: Jeff $
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*
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* Header for fixed-point math functions
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*
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* $Log: /DescentIII/Main/Lib/fix.h $
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*
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* 4 10/21/99 9:27p Jeff
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* B.A. Macintosh code merge
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*
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* 3 9/09/97 3:53p Chris
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* Added a #define PI to fix.h
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*
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* 2 8/22/97 12:34p Jason
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* added FixCeil and FixFloor
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*
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* 1 6/23/97 9:25p Samir
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* added because source safe sucks
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*
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* 7 2/27/97 4:57p Samir
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* include fixwin32.h from win\fixwin32.h
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*
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* 6 2/27/97 4:52 PM Jeremy
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* moved inline asm fixmul/div functions into separate header files for
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* mac and pc.
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*
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* 5 2/12/97 5:27p Jason
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* implemented asin,acos,atan2
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*
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* 4 2/10/97 1:57p Jason
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* changed FloatToFix back to what it originally was
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*
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* 3 2/07/97 5:44p Matt
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* Moved fixed-point math funcs from vecmat to fix
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* Changed trig functions to use small table like D2
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*
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* $NoKeywords: $
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*/
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#ifndef _FIX_H
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#define _FIX_H
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#include "math.h"
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// Disable the "possible loss of data" warning
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#pragma warning(disable : 4244)
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// Angles are unsigned shorts
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typedef unsigned short angle;
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// The basic fixed-point type
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typedef long fix;
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#define PI 3.141592654
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#define PIOVER2 1.570796327 // DAJ
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// Constants for converted between fix and float
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#define FLOAT_SCALER 65536.0
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#define FIX_SHIFT 16
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// 1.0 in fixed-point
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#define F1_0 (1 << FIX_SHIFT)
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// Generate the data for the trig tables. Must be called before trig functions
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void InitMathTables();
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// Returns the sine of the given angle. Linearly interpolates between two entries in a 256-entry table
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float FixSin(angle a);
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// Returns the cosine of the given angle. Linearly interpolates between two entries in a 256-entry table
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float FixCos(angle a);
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// Returns the sine of the given angle, but does no interpolation
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float FixSinFast(angle a);
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// Returns the cosine of the given angle, but does no interpolation
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float FixCosFast(angle a);
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#define Round(x) ((int)(x + 0.5))
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fix FloatToFixFast(float num);
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// Conversion macros
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//??#define FloatToFix(num) Round((num) * FLOAT_SCALER)
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#define FloatToFix(num) ((fix)((num)*FLOAT_SCALER))
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#define IntToFix(num) ((num) << FIX_SHIFT)
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#define ShortToFix(num) (((long)(num)) << FIX_SHIFT)
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#define FixToFloat(num) (((float)(num)) / FLOAT_SCALER)
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#define FixToInt(num) ((num) >> FIX_SHIFT)
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#define FixToShort(num) ((short)((num) >> FIX_SHIFT))
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// Fixed-point math functions in inline ASM form
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#if defined(MACINTOSH)
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#include "fixmac.h"
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#elif defined(WIN32)
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#include "win\fixwin32.h"
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#endif
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// use this instead of:
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// for: (int)floor(x+0.5f) use FloatRound(x)
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// (int)ceil(x-0.5f) use FloatRound(x)
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// (int)floor(x-0.5f) use FloatRound(x-1.0f)
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// (int)floor(x) use FloatRound(x-0.5f)
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// for values in the range -2048 to 2048
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int FloatRound(float x);
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angle FixAtan2(float cos, float sin);
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angle FixAsin(float v);
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angle FixAcos(float v);
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// Does a ceiling operation on a fixed number
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fix FixCeil(fix num);
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// Floors a fixed number
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fix FixFloor(fix num);
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#endif
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