vec4 effect(vec4 color, Image tex, vec2 texture_coords, vec2 screen_coords)
{
	/**
		texture_coords[0] is the x position of the pixel,
		texture_coords[1] is the y position
	*/
	texture_coords[0] += .5; // shift the pixels to the left
        vec4 texturecolor = Texel(tex, texture_coords);
        return texturecolor * color;
}