precision mediump float;

uniform sampler2D uNormal;
uniform sampler2D uBlur;
uniform sampler2D uOcclusion;

varying vec2 fUV;

void main() {
    float occ = texture2D(uOcclusion, fUV).x;
    vec4 normalColor = texture2D(uNormal, fUV);

    // Tint the transparent parts of the source image with white
    if (normalColor.w < 1.0) {
        normalColor.xyz = (normalColor.xyz * normalColor.w) + (vec3(1.0, 1.0, 1.0) * (1.0 - normalColor.w));
        normalColor.w = 1.0;
    }

    if (occ >= 1.0) {
        gl_FragColor = normalColor;
    }
    else if (occ <= 0.0) {
        gl_FragColor = texture2D(uBlur, fUV);
    }
    else {
        gl_FragColor.xyz = (normalColor.xyz * occ) + (texture2D(uBlur, fUV).xyz * (1.0 - occ));
    }

    gl_FragColor.w = 1.0;
}