87 lines
1.0 KiB
C
87 lines
1.0 KiB
C
#include "global.h"
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s16 MathUtil_Mul16(s16 x, s16 y)
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{
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s32 result;
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result = x;
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result *= y;
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result /= 256;
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return result;
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}
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s16 MathUtil_Mul16Shift(u8 s, s16 x, s16 y)
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{
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s32 result;
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result = x;
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result *= y;
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result /= (1 << s);
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return result;
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}
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s32 MathUtil_Mul32(s32 x, s32 y)
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{
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s64 result;
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result = x;
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result *= y;
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result /= 256;
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return result;
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}
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s16 MathUtil_Div16(s16 x, s16 y)
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{
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if (y == 0)
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{
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return 0;
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}
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return (x << 8) / y;
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}
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s16 MathUtil_Div16Shift(u8 s, s16 x, s16 y)
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{
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if (y == 0)
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{
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return 0;
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}
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return (x << s) / y;
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}
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s32 MathUtil_Div32(s32 x, s32 y)
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{
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s64 _x;
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if (y == 0)
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{
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return 0;
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}
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_x = x;
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_x *= 256;
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return _x / y;
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}
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s16 MathUtil_Inv16(s16 y)
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{
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s32 x;
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x = 0x10000;
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return x / y;
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}
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s16 MathUtil_Inv16Shift(u8 s, s16 y)
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{
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s32 x;
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x = 0x100 << s;
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return x / y;
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}
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s32 MathUtil_Inv32(s32 y)
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{
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s64 x;
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x = 0x10000;
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return x / y;
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}
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