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add atan(x) and atan2(y,x)

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PROP 65 2024-08-19 00:58:22 +00:00 committed by GitHub
parent 76ad5ebd3b
commit b7125d9b10
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1 changed files with 46 additions and 0 deletions
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src/nuklear_math.c
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@ -84,6 +84,52 @@ nk_cos(float x)
return a0 + x*(a1 + x*(a2 + x*(a3 + x*(a4 + x*(a5 + x*(a6 + x*(a7 + x*a8)))))));
}
#endif
#ifndef NK_ATAN
#define NK_ATAN nk_atan
NK_LIB float
nk_atan(float x)
{
/* ./lolremez --progress --float -d 9 -r "0:pi*2" "atan(x)" */
float u = -1.0989005e-05f;
NK_ASSERT(x >= 0.0f && "TODO support negative floats");
u = u * x + 0.00034117949f;
u = u * x + -0.0044932296f;
u = u * x + 0.032596264f;
u = u * x + -0.14088021f;
u = u * x + 0.36040401f;
u = u * x + -0.47017866f;
u = u * x + 0.00050198776f;
u = u * x + 1.0077682f;
u = u * x + -0.0004765437f;
return u;
}
#endif
#ifndef NK_ATAN2
#define NK_ATAN2 nk_atan2
NK_LIB float
nk_atan2(float y, float x)
{
float ax = NK_ABS(x),
ay = NK_ABS(y);
/* 0 = +y +x 1 = -y +x
2 = +y -x 3 = -y -x */
nk_uint signs = (y < 0) | ((x < 0) << 1);
float a;
if(y == 0.0 && x == 0.0) return 0.0f;
a = (ay > ax)
? NK_PI_HALF - NK_ATAN(ax / ay)
: NK_ATAN(ay / ax);
switch(signs){
case 0: return a;
case 1: return -a;
case 2: return -a + NK_PI;
case 3: return a - NK_PI;
}
return 0.0f; /* prevents warning */
}
#endif
NK_LIB nk_uint
nk_round_up_pow2(nk_uint v)
{