RayGBA/Fixed32.cpp at main · MGPAlpha/RayGBA · GitHub

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#include <cmath>
#include "Fixed32.hpp"

fixed32 fixed32::sin(int theta) {
    if (!trigDataInitialized) {
        initializeTrigData();
    }
    theta %= 360;
    return sinData[theta];
}

fixed32 fixed32::cos(int theta) {
    if (!trigDataInitialized) {
        initializeTrigData();
    }
    theta += 90;
    theta %= 360;
    return sinData[theta];
}

fixed32 fixed32::tan(int theta) {
    if (!trigDataInitialized) {
        initializeTrigData();
    }
    theta %= 180;
    return tanData[theta];
}

bool fixed32::trigDataInitialized = false;

void fixed32::initializeTrigData() {
    initializeSin();
    initializeTan();
    trigDataInitialized = true;
}

fixed32 fixed32::sinData[360] = {};
fixed32 fixed32::tanData[180] = {};

void fixed32::initializeSin() {
    for (int i = 0; i < 360; i++) {
        sinData[i] = sinf(i * M_PI * 2 / 360.);
    }
}

void fixed32::initializeTan() {
    for (int i = 0; i < 180; i++) {
        tanData[i] = tanf(i * M_PI * 2 / 360.);
    }
}