Function getFirePaletteIndex

examples/FestivalStick/curr.h:580–606

}

uint8_t getFirePaletteIndex(uint32_t millis32, int width, int max_width, int height, int max_height,
                        uint32_t y_speed) {
    uint16_t scale = fireScaleXY.as<uint16_t>();
    
    float xf = (float)width / (float)max_width;  
    uint8_t x = (uint8_t)(xf * 255);            
    
    uint32_t cosx = cos8(x);  
    uint32_t sinx = sin8(x);  
    
    float trig_scale = scale * fireScaleX.value();
    cosx *= trig_scale;
    sinx *= trig_scale;
    
    uint32_t y = height * scale + y_speed;
    
    uint16_t z = millis32 / fireInvSpeedZ.as<uint16_t>();

    uint16_t noise16 = inoise16(cosx << 8, sinx << 8, y << 8, z << 8);
    
    uint8_t noise_val = noise16 >> 8;
    
    int8_t subtraction_factor = abs8(height - (max_height - 1)) * 255 /
                                (max_height - 1);
    
    return qsub8(noise_val, subtraction_factor);
}

void fillFrameBufferFire(uint32_t now) {
    fl::CRGBPalette16 myPal = getFirePalette();