source: experimental/distortionNG/shaderIntensityMap.frag @ 365

uniform sampler2DRect sceneTexture;
uniform sampler2DRect intensityMapTexture;
varying vec2 texcoord_scene;
varying vec2 texcoord_intensityMap;

void main(void)
{
        vec4 sceneColor;
        vec4 blendColor;

        sceneColor = texture2DRect(sceneTexture, gl_FragCoord);
        blendColor = texture2DRect(intensityMapTexture, gl_FragCoord);
        gl_FragColor = sceneColor * blendColor;
}