A simple OutRun on Casio Graph 90+E
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OutRun/src/fixed.h

85 lines
1.4 KiB

//---
// fixed: 48:16 fixed-point arithmetic
//---
#pragma once
#include <stdint.h>
typedef int64_t fixed_t;
/* Standard arithmetic. */
static inline fixed_t fmul(fixed_t left, fixed_t right)
{
/* Generally optimized by the compiler to use dmuls.l and xtrct */
int64_t p = (int64_t)left * (int64_t)right;
return (int32_t)(p >> 16);
}
static inline fixed_t fdiv(fixed_t left, fixed_t right)
{
/* Pretty slow */
int64_t d = (int64_t)left << 16;
return d / right;
}
#define fix(x) ((int)((x) * 65536))
static inline fixed_t fixdouble(double constant)
{
return (fixed_t)(constant * 65536);
}
static inline fixed_t fixfloat(float constant)
{
return (fixed_t)(constant * 65536);
}
static inline fixed_t fdec(fixed_t f)
{
return f & 0xffff;
}
static inline int ffloor(fixed_t f)
{
return f >> 16;
}
static inline int fceil(fixed_t f)
{
return (f + 0xffff) >> 16;
}
static inline int fround(fixed_t f)
{
return (f + 0x8000) >> 16;
}
static inline float f2float(fixed_t f)
{
return (float)f / 65536;
}
static inline double f2double(fixed_t f)
{
return (double)f / 65536;
}
static inline double f2int(fixed_t f)
{
return (int)f / 65536;
}
static inline fixed_t feasein(fixed_t x)
{
return fmul(x, x);
}
static inline fixed_t fease(fixed_t x)
{
if(x <= fix(0.5)) {
return 2 * fmul(x, x);
}
else {
x = fix(1) - x;
return fix(1) - 2 * fmul(x, x);
}
}