declare const _default: "\n    #include \"screenDepthPS\"\n\n    varying vec2 uv0;\n\n    uniform sampler2D sourceTexture;\n    uniform vec2 sourceInvResolution;\n    uniform int filterSize;\n\n    float random(const highp vec2 w) {\n        const vec3 m = vec3(0.06711056, 0.00583715, 52.9829189);\n        return fract(m.z * fract(dot(w, m.xy)));\n    }\n\n    mediump float bilateralWeight(in mediump float depth, in mediump float sampleDepth) {\n        mediump float diff = (sampleDepth - depth);\n        return max(0.0, 1.0 - diff * diff);\n    }\n\n    void tap(inout float sum, inout float totalWeight, float weight, float depth, vec2 position) {\n\n        mediump float color = texture2D(sourceTexture, position).r;\n        mediump float textureDepth = -getLinearScreenDepth(position);\n    \n        mediump float bilateral = bilateralWeight(depth, textureDepth);\n\n        bilateral *= weight;\n        sum += color * bilateral;\n        totalWeight += bilateral;\n    }\n\n    // TODO: weights of 1 are used for all samples. Test with gaussian weights\n    void main() {\n\n        // handle the center pixel separately because it doesn't participate in bilateral filtering\n        mediump float depth = -getLinearScreenDepth(uv0);\n        mediump float totalWeight = 1.0;\n        mediump float color = texture2D(sourceTexture, uv0 ).r;\n        mediump float sum = color * totalWeight;\n\n        for (mediump int i = -filterSize; i <= filterSize; i++) {\n            mediump float weight = 1.0;\n\n            #ifdef HORIZONTAL\n                vec2 offset = vec2(i, 0) * sourceInvResolution;\n            #else\n                vec2 offset = vec2(0, i) * sourceInvResolution;\n            #endif\n\n            tap(sum, totalWeight, weight, depth, uv0 + offset);\n        }\n\n        mediump float ao = sum / totalWeight;\n\n        // simple dithering helps a lot (assumes 8 bits target)\n        // this is most useful with high quality/large blurs\n        // ao += ((random(gl_FragCoord.xy) - 0.5) / 255.0);\n\n        gl_FragColor.r = ao;\n    }\n";
export default _default;