83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*
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This file is part of Warzone 2100.
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Copyright (C) 1999-2004 Eidos Interactive
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Copyright (C) 2005-2007 Warzone Resurrection Project
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Warzone 2100 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Warzone 2100 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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*! \file fractions.h
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* \brief Routines to provide simple maths functions that work on both PSX & PC
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*/
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// Use the type "FRACT" instead of FLOAT
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// - This is defined as a float on PC and a 20.12 fixed point number on PSX
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//
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// Use:-
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// MAKEFRACT(int); to convert from a SDWORD to a FRACT
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// MAKEINT(fract); to convert the other way
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// FRACTmul(fract,fract); to multiply two fract numbers
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// FRACTdiv(fract,fract); to divide two numbers
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// SQRT(fract); to get square root of a fract (returns a fract)
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// sqrtf(int); to get a square root of an integer (returns an UDWORD) (no, it does not! - Per)
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// FRACTCONST(constA,constB); ; Generates a constant of (constA/constB)
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// e.g. to define 0.5 use FRACTCONST(1,2)
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// to define 0.114 use FRACTCONT(114,1000)
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//
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// Also PERCENT(int,int); // returns a int value 0->100 of the percentage of the first param over the second
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//
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// To multiply a float by a integer just use the normal operator
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// e.g. FractValue2=FractValue*Interger;
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//
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// same is true of divide
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#ifndef _FRACTIONS_
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#define _FRACTIONS_
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/* Check the header files have been included from frame.h if they
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* are used outside of the framework library.
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*/
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#if !defined(_frame_h) && !defined(FRAME_LIB_INCLUDE)
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#error Framework header files MUST be included from Frame.h ONLY.
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#endif
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#include "types.h"
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#include <math.h>
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#define PERCENT(a,b) (((a)*100)/(b))
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#define PERNUM(range,a,b) (((a)*range)/(b))
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#ifndef M_PI
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# define M_PI 3.14159265358979323846
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#endif
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typedef float FRACT_D; /* But isn't this is supposed to be double? - Per */
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#define ROUND(x) ((x)>=0 ? (SDWORD)((x) + 0.5) : (SDWORD)((x) - 0.5))
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#define MAKEFRACT(x) ((float)(x))
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#define FRACTmul(x,y) ((float)(x)*(float)(y))
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#define FRACTdiv(x,y) ((float)(x)/(float)(y))
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#define FRACTCONST(a,b) (((float)(a)) / ((float)(b)))
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#define MAKEFRACT_D(x) ((FRACT_D)(x))
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#define FRACTmul_D(x,y) ((double)(x)*(double)(y))
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#define FRACTdiv_D(x,y) ((double)(x)/(double)(y))
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#define MAKEINT_D(x) ((SDWORD)(x))
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#define MAKEINT(x) ((SDWORD)(x))
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#endif
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