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++ void MAIN()
++ {
++ vec4 sourceColor = texture(INPUT, INPUT_UV);
++ vec4 summation = texture(downsample2, INPUT_UV) + texture(downsample4, INPUT_UV);
++ vec3 bloom_result = sourceColor.xyz * exposureExp2 + summation.xyz;
++ vec3 thresholded = clamp(bloom_result.xyz, 0.0, channelThreshold) / channelThreshold;
++ vec3 tonemapped = pow(thresholded, vec3(1.0 / gamma));
++ vec3 final_color = mix(thresholded, tonemapped, tonemappingLerp);
++ float resultAlpha = max(summation.a, sourceColor.a);
++ FRAGCOLOR = vec4(final_color, resultAlpha);
++ }