LÖVE

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 // if not on the normal map draw attenuated shadows
    if(normalColor.a <= 0.0) {
      //start with a dark color and add in the light color and shadow color
      pixel = vec4(0.0, 0.0, 0.0, 1.0);
      if (lightGlow.x < 1.0 && lightGlow.y > 0.0) {
        pixel.rgb = clamp(lightColor * pow(att, lightSmooth) + pow(smoothstep(lightGlow.x, 1.0, att), lightSmooth) * lightGlow.y, 0.0, 1.0);
      } else {
        pixel.rgb = lightColor * pow(att, lightSmooth);
      }
    } else {
      vec3 normal = normalize(vec3(normalColor.r,invert_normal ? 1 - normalColor.g : normalColor.g, normalColor.b) * 2.0 - 1.0); 
      //on the normal map, draw normal shadows
      vec3 dir = vec3((lightPosition.xy - pixel_coords.xy) / love_ScreenSize.xy, lightPosition.z);
      dir.x *= love_ScreenSize.x / love_ScreenSize.y;
      vec3 diff = lightColor * max(dot(normalize(normal), normalize(dir)), 0.0);
      //return the light that is effected by the normal and attenuation
      pixel = vec4(diff * att, 1.0);
    }

    if(shadowColor.a > 0.0) {
      pixel.rgb = pixel.rgb * shadowColor.rgb;
    }
return pixel;