export declare const hbao = "\nvarying vec2 vUv;\n\nuniform highp sampler2D depthTexture;\n\nuniform mat4 projectionViewMatrix;\nuniform int frame;\n\nuniform sampler2D blueNoiseTexture;\nuniform vec2 blueNoiseRepeat;\nuniform vec2 texSize;\n\nuniform float aoDistance;\nuniform float distancePower;\nuniform float bias;\nuniform float thickness;\n\n#include <packing>\n// HBAO Utils\n#include <hbao_utils>\n\nfloat getOcclusion(const vec3 cameraPosition, const vec3 worldPos, const vec3 worldNormal, const float depth, const int seed, inout float totalWeight) {\n    vec4 blueNoise = sampleBlueNoise(blueNoiseTexture, seed, blueNoiseRepeat, texSize);\n\n    vec3 sampleWorldDir = cosineSampleHemisphere(worldNormal, blueNoise.rg);\n\n    vec3 sampleWorldPos = worldPos + aoDistance * pow(blueNoise.b, distancePower + 1.0) * sampleWorldDir;\n\n    // Project the sample position to screen space\n    vec4 sampleUv = projectionViewMatrix * vec4(sampleWorldPos, 1.);\n    sampleUv.xy /= sampleUv.w;\n    sampleUv.xy = sampleUv.xy * 0.5 + 0.5;\n\n    // Get the depth of the sample position\n    float sampleDepth = textureLod(depthTexture, sampleUv.xy, 0.0).r;\n\n    // Compute the horizon line\n    float deltaDepth = depth - sampleDepth;\n\n    // distance based bias\n    float d = distance(sampleWorldPos, cameraPosition) / aoDistance;\n    deltaDepth *= 0.001 * d * d;\n\n    float th = thickness * 0.01;\n\n    float theta = dot(worldNormal, sampleWorldDir);\n    totalWeight += theta;\n\n    if (deltaDepth < th) {\n        float horizon = sampleDepth + deltaDepth * bias * 1000.;\n\n        float occlusion = max(0.0, horizon - depth) * theta;\n\n        float m = max(0., 1. - deltaDepth / th);\n        occlusion = 10. * occlusion * m / d;\n\n        occlusion = max(0.0, occlusion);\n        occlusion = sqrt(occlusion);\n        return occlusion;\n    }\n\n    return 0.;\n}\n\nvoid main() {\n    float depth = textureLod(depthTexture, vUv, 0.0).r;\n\n    // filter out background\n    if (depth == 1.0) {\n        discard;\n        return;\n    }\n\n    vec4 cameraPosition = cameraMatrixWorld * vec4(0.0, 0.0, 0.0, 1.0);\n\n    vec3 worldPos = getWorldPos(depth, vUv);\n    vec3 worldNormal = getWorldNormal(vUv);\n\n    float ao = 0.0, totalWeight = 0.0;\n\n    for (int i = 0; i < spp; i++) {\n        int seed = i;\n#ifdef animatedNoise\n        seed += frame;\n#endif\n\n        float occlusion = getOcclusion(cameraPosition.xyz, worldPos, worldNormal, depth, seed, totalWeight);\n        ao += occlusion;\n    }\n\n    if (totalWeight > 0.) ao /= totalWeight;\n\n    // clamp ao to [0, 1]\n    ao = clamp(1. - ao, 0., 1.);\n\n    gl_FragColor = vec4(worldNormal, ao);\n}\n";
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