Function fillFrameBufferNoise

examples/FestivalStick/curr.h:432–519

    }
}
FL_OPTIMIZATION_LEVEL_O0_END

void fillFrameBufferNoise() {
    // Get current UI values
    uint8_t noise_scale = noiseScale.value();
    uint8_t noise_speed = noiseSpeed.value();
    
    // Derive noise coordinates from current time instead of forward iteration
    uint32_t now = fl::millis();
    uint16_t noise_z = now * noise_speed / 10;  // Primary time dimension
    uint16_t noise_x = now * noise_speed / 80;  // Slow drift in x
    uint16_t noise_y = now * noise_speed / 160; // Even slower drift in y (opposite direction)
    
    int width = frameBufferPtr->width();
    int height = frameBufferPtr->height();
    
    // Data smoothing for low speeds (from NoisePlusPalette example)
    uint8_t dataSmoothing = 0;
    if(noise_speed < 50) {
        dataSmoothing = 200 - (noise_speed * 4);
    }
    
    // Generate noise for each pixel in the frame buffer using cylindrical mapping
    for(int x = 0; x < width; x++) {
        for(int y = 0; y < height; y++) {
            // Convert rectangular coordinates to cylindrical coordinates
            // Map x to angle (0 to 2*FL_PI), y remains as height
            float angle = (float(x) / float(width)) * 2.0f * FL_PI;
            
            // Convert cylindrical coordinates to cartesian for noise sampling
            // Use the noise_scale to control the cylinder size in noise space
            float cylinder_radius = noise_scale; // Use the existing noise_scale parameter
            
            // Calculate cartesian coordinates on the cylinder surface
            float noise_x_cyl = fl::cos(angle) * cylinder_radius;
            float noise_y_cyl = fl::sin(angle) * cylinder_radius;
            float noise_z_height = float(y) * noise_scale; // Height component
            
            // Apply time-based offsets
            int xoffset = int(noise_x_cyl) + noise_x;
            int yoffset = int(noise_y_cyl) + noise_y;
            int zoffset = int(noise_z_height) + noise_z;
            
            // Generate 8-bit noise value using 3D Perlin noise with cylindrical coordinates
            uint8_t data = inoise8(xoffset, yoffset, zoffset);
            
            // Expand the range from ~16-238 to 0-255 (from NoisePlusPalette)
            data = qsub8(data, 16);
            data = qadd8(data, scale8(data, 39));
            
            // Apply data smoothing if enabled
            if(dataSmoothing) {
                fl::CRGB oldColor = frameBufferPtr->at(x, y);
                uint8_t olddata = (oldColor.r + oldColor.g + oldColor.b) / 3; // Simple brightness extraction
                uint8_t newdata = scale8(olddata, dataSmoothing) + scale8(data, 256 - dataSmoothing);
                data = newdata;
            }