mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-11-18 02:01:39 +00:00
149 lines
No EOL
3 KiB
C++
149 lines
No EOL
3 KiB
C++
#ifndef __CMATH_H
|
|
#define __CMATH_H
|
|
|
|
#include "xs_Float.h"
|
|
|
|
#define USE_CUSTOM_MATH // we want repreducably reliable results, even at the cost of performance
|
|
#define USE_FAST_MATH // use faster table-based sin and cos variants with limited precision (sufficient for Doom gameplay)
|
|
|
|
extern"C"
|
|
{
|
|
double c_asin(double);
|
|
double c_acos(double);
|
|
double c_atan(double);
|
|
double c_atan2(double, double);
|
|
double c_sin(double);
|
|
double c_cos(double);
|
|
double c_tan(double);
|
|
double c_cot(double);
|
|
double c_sqrt(double);
|
|
double c_sinh(double);
|
|
double c_cosh(double);
|
|
double c_tanh(double);
|
|
double c_exp(double);
|
|
double c_log(double);
|
|
double c_log10(double);
|
|
double c_pow(double, double);
|
|
}
|
|
|
|
|
|
// This uses a sine table with linear interpolation
|
|
// For in-game calculations this is precise enough
|
|
// and this code is more than 10x faster than the
|
|
// Cephes sin and cos function.
|
|
|
|
struct FFastTrig
|
|
{
|
|
static const int TBLPERIOD = 8192;
|
|
static const int BITSHIFT = 19;
|
|
static const int REMAINDER = (1 << BITSHIFT) - 1;
|
|
float sinetable[2049];
|
|
|
|
double sinq1(unsigned);
|
|
|
|
public:
|
|
FFastTrig();
|
|
double sin(unsigned);
|
|
double cos(unsigned);
|
|
};
|
|
|
|
extern FFastTrig fasttrig;
|
|
|
|
// This must use xs_Float to guarantee proper integer wraparound.
|
|
#define DEG2BAM(f) ((unsigned)xs_CRoundToInt((f) * (0x40000000/90.)))
|
|
#define RAD2BAM(f) ((unsigned)xs_CRoundToInt((f) * (0x80000000/3.14159265358979323846)))
|
|
|
|
|
|
inline double fastcosdeg(double v)
|
|
{
|
|
return fasttrig.cos(DEG2BAM(v));
|
|
}
|
|
|
|
inline double fastsindeg(double v)
|
|
{
|
|
return fasttrig.sin(DEG2BAM(v));
|
|
}
|
|
|
|
inline double fastcos(double v)
|
|
{
|
|
return fasttrig.cos(RAD2BAM(v));
|
|
}
|
|
|
|
inline double fastsin(double v)
|
|
{
|
|
return fasttrig.sin(RAD2BAM(v));
|
|
}
|
|
|
|
// these are supposed to be local to this file.
|
|
#undef DEG2BAM
|
|
#undef RAD2BAM
|
|
|
|
inline double sindeg(double v)
|
|
{
|
|
#ifdef USE_CUSTOM_MATH
|
|
return c_sin(v * (3.14159265358979323846 / 180.));
|
|
#else
|
|
return sin(v * (3.14159265358979323846 / 180.));
|
|
#endif
|
|
}
|
|
|
|
inline double cosdeg(double v)
|
|
{
|
|
#ifdef USE_CUSTOM_MATH
|
|
return c_cos(v * (3.14159265358979323846 / 180.));
|
|
#else
|
|
return cos(v * (3.14159265358979323846 / 180.));
|
|
#endif
|
|
}
|
|
|
|
|
|
#ifndef USE_CUSTOM_MATH
|
|
#define g_asin asin
|
|
#define g_acos acos
|
|
#define g_atan atan
|
|
#define g_atan2 atan2
|
|
#define g_sin sin
|
|
#define g_cos cos
|
|
#define g_sindeg sindeg
|
|
#define g_cosdeg cosdeg
|
|
#define g_tan tan
|
|
#define g_cot cot
|
|
#define g_sqrt sqrt
|
|
#define g_sinh sinh
|
|
#define g_cosh cosh
|
|
#define g_tanh tanh
|
|
#define g_exp exp
|
|
#define g_log log
|
|
#define g_log10 log10
|
|
#define g_pow pow
|
|
#else
|
|
#define g_asin c_asin
|
|
#define g_acos c_acos
|
|
#define g_atan c_atan
|
|
#define g_atan2 c_atan2
|
|
#ifndef USE_FAST_MATH
|
|
#define g_sindeg sindeg
|
|
#define g_cosdeg cosdeg
|
|
#define g_sin c_sin
|
|
#define g_cos c_cos
|
|
#else
|
|
#define g_sindeg fastsindeg
|
|
#define g_cosdeg fastcosdeg
|
|
#define g_sin fastsin
|
|
#define g_cos fastcos
|
|
#endif
|
|
#define g_tan c_tan
|
|
#define g_cot c_cot
|
|
#define g_sqrt c_sqrt
|
|
#define g_sinh c_sinh
|
|
#define g_cosh c_cosh
|
|
#define g_tanh c_tanh
|
|
#define g_exp c_exp
|
|
#define g_log c_log
|
|
#define g_log10 c_log10
|
|
#define g_pow c_pow
|
|
#endif
|
|
|
|
|
|
|
|
#endif |