164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
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/*
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* $Id: fltval.h,v 1.7 1995/12/01 18:07:12 dave Exp $
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*
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* Copyright (c) Microsoft Corp. 1993-1997
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* Version 1.1
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*
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* All rights reserved.
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*
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* This file contains private, unpublished information and may not be
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* copied in part or in whole without express permission of
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* Microsoft Corp.
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*
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*/
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#ifndef __D3DFLOAT__
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#define __D3DFLOAT__
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/*
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* Convert a value to fixed point at given precision.
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*/
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#define VALTOFXP(d,prec) ((int)SAFE_FLOAT_TO_INT((d) * (double)(1 << (prec))))
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extern double RLDDIConvertIEEE[];
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__inline int QVALTOFXP(double d, int prec)
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{
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double tmp = d+RLDDIConvertIEEE[prec];
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return *(int *)&tmp;
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}
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/*
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* Convert from fixed point to value.
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*/
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#define FXPTOVAL(f,prec) ((float)(((double)(f)) / (double)(1 << (prec))))
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/*
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* Convert from integer to fixed point.
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*/
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#define ITOFXP(i,prec) ((i) << (prec))
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/*
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* Convert from fixed point to integer, truncating.
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*/
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#define FXPTOI(f,prec) ((int)((f) >> (prec)))
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/*
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* Convert from fixed point to nearest integer greater or equal to f.
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*/
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#define FXPCEIL(f,prec) ((int)(((f) + (1 << (prec)) - 1) >> (prec)))
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/*
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* Convert a double to fixed point at given precision.
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*/
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#define DTOVALP(d,prec) ((float) (d))
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/*
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* Convert from fixed point to double.
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*/
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#define VALPTOD(f,prec) ((double) (f))
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/*
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* Convert from integer to fixed point.
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*/
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#define ITOVALP(i,prec) ((float)(i))
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/*
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* Convert from fixed point to integer, truncating.
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*/
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#define VALPTOI(f,prec) ((int)(f))
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/*
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* Convert from fixed point to integer, rounding.
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*/
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#define VALPROUND(f,prec) ((int)((f) + 0.5))
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/*
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* Convert between fixed point precisions.
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*/
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#define VALPTOVALP(f,from,to) (f)
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/*
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* Increase the precision of a value.
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*/
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#define INCPREC(f,amount) (f)
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/*
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* Decrease the precision of a value.
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*/
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#define DECPREC(f,amount) (f)
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#define RLDDIFMul8(a, b) ((a) * (b))
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#define RLDDIFMul12(a, b) ((a) * (b))
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#define RLDDIFMul16(a, b) ((a) * (b))
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#define RLDDIFMul24(a, b) ((a) * (b))
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#define RLDDIFInvert12(a) (1.0f / (a))
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#define RLDDIFInvert16(a) (1.0f / (a))
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#define RLDDIFInvert24(a) (1.0f / (a))
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#define RLDDIFMulDiv(a, b, c) ((a) * (b) / (c))
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#define RLDDIFDiv24(a, b) ((a) / (b))
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#define RLDDIFDiv16(a, b) ((a) / (b))
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#define RLDDIFDiv12(a, b) ((a) / (b))
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#define RLDDIFDiv8(a, b) ((a) / (b))
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/*
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* RLDDIFDiv8, checking for overflow.
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*/
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#define RLDDICheckDiv8(a, b) ((a) / (b))
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/*
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* RLDDIFDiv16, checking for overflow.
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*/
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#define RLDDICheckDiv16(a, b) ((a) / (b))
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#define RLDDIGetZStep(zl, zr, zm, h3, h1) \
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(((zr - zm) * h3 - (zl - zm) * h1) / denom)
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#include <limits.h>
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#if defined(i386)
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#define SAFE_FLOAT_TO_INT(f) ((f) > LONG_MAX \
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? LONG_MAX \
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: (f) < LONG_MIN \
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? LONG_MIN \
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: (int)(f))
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#else
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#define SAFE_FLOAT_TO_INT(f) ((int)(f))
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#endif
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/*
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* Normal precision used to store numbers.
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*/
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#define NORMAL_PREC 16
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#define DTOVAL(d) DTOVALP(d,NORMAL_PREC)
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#define VALTOD(f) VALPTOD(f,NORMAL_PREC)
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#define ITOVAL(i) ITOVALP(i,NORMAL_PREC)
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#define VALTOI(f) VALPTOI(f,NORMAL_PREC)
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#define VALROUND(f) VALPROUND(f,NORMAL_PREC)
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#define VALTOFX(f) VALTOFXP(f,NORMAL_PREC)
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#define FXTOVAL(f) FXPTOVAL(f,NORMAL_PREC)
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#define ITOFX(i) ITOFXP(i,NORMAL_PREC)
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#define FXTOI(f) FXPTOI(f,NORMAL_PREC)
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#define FXROUND(f) FXPROUND(f,NORMAL_PREC)
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#define FXFLOOR(f) FXPTOI(f,NORMAL_PREC)
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#define FXCEIL(f) FXPCEIL(f,NORMAL_PREC)
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#define VALTOFX24(f) VALTOFXP(f,24)
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#define FX24TOVAL(f) FXPTOVAL(f,24)
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#define VALTOFX20(f) VALTOFXP(f,20)
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#define FX20TOVAL(f) FXPTOVAL(f,20)
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#define VALTOFX12(f) VALTOFXP(f,12)
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#define FX12TOVAL(f) FXPTOVAL(f,12)
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#define VALTOFX8(f) VALTOFXP(f,8)
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#define FX8TOVAL(f) FXPTOVAL(f,8)
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#endif
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