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https://github.com/ZDoom/raze-gles.git
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58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#ifndef __M_FIXED__
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#define __M_FIXED__
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#include <stdlib.h>
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#include <stdint.h>
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#include "basics.h"
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__forceinline constexpr int32_t MulScale(int32_t a, int32_t b, int32_t shift) { return (int32_t)(((int64_t)a * b) >> shift); }
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__forceinline constexpr int32_t MulScaleF(double a, double b, int32_t shift) { return (a * b) * (1. / (uint32_t(1) << shift)); }
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__forceinline constexpr int32_t DMulScale(int32_t a, int32_t b, int32_t c, int32_t d, int32_t shift) { return (int32_t)(((int64_t)a * b + (int64_t)c * d) >> shift); }
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__forceinline constexpr int32_t TMulScale(int32_t a, int32_t b, int32_t c, int32_t d, int32_t e, int32_t f, int32_t shift) { return (int32_t)(((int64_t)a * b + (int64_t)c * d + (int64_t)e * f) >> shift); }
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__forceinline constexpr int32_t DivScale(int32_t a, int32_t b, int shift) { return (int32_t)(((int64_t)a << shift) / b); }
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#include "xs_Float.h"
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inline fixed_t FloatToFixed(double f)
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{
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return xs_Fix<16>::ToFix(f);
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}
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inline constexpr fixed_t IntToFixed(int32_t f)
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{
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return f << FRACBITS;
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}
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inline constexpr double FixedToFloat(fixed_t f)
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{
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return f * (1/65536.);
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}
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inline constexpr int32_t FixedToInt(fixed_t f)
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{
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return (f + FRACUNIT/2) >> FRACBITS;
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}
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inline unsigned FloatToAngle(double f)
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{
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return xs_CRoundToInt((f)* (0x40000000 / 90.));
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}
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inline constexpr double AngleToFloat(unsigned f)
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{
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return f * (90. / 0x40000000);
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}
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inline constexpr double AngleToFloat(int f)
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{
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return f * (90. / 0x40000000);
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}
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#define FLOAT2FIXED(f) FloatToFixed(f)
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#define FIXED2FLOAT(f) float(FixedToFloat(f))
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#define FIXED2DBL(f) FixedToFloat(f)
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#define ANGLE2DBL(f) AngleToFloat(f)
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#endif
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