void ScreenBuffer::draw(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    
    for (int x = 0; x < getWidth(); x ++) {
        for (int y = 0; y < getHeight(); y ++) {
            if (getPixelIntensity(x, y) != 0.0) {
                drawPixel(x, y, getPixelIntensity(x, y));
            }
        }
    }
    
    glFlush();
    glutSwapBuffers();
}
IntensityImage * StudentPreProcessing::stepToIntensityImage(const RGBImage &image) const
{
	const int width = image.getWidth();
	const int height = image.getHeight();
	auto & output = *ImageFactory::newIntensityImage(width, height);

	for (int x = 0; x < width; x++)
	{
		for (int y = 0; y < height; y++)
		{
			RGB rgb = image.getPixel(x, y);
			output.setPixel(x, y, getPixelIntensity(rgb));
		}
	}

	return &output;
}