@babylonjs/viewer/dist/chunks/hdrFilteringFunctions-sONVqho1.esm.min.js

The Babylon Viewer aims to simplify a specific but common Babylon.js use case: loading, viewing, and interacting with a 3D model.

import{S as e}from"./index-Bw2N6w1y.esm.min.js";const n="importanceSampling";e.IncludesShadersStoreWGSL[n]||(e.IncludesShadersStoreWGSL[n]="fn hemisphereCosSample(u: vec2f)->vec3f {var phi: f32=2.*PI*u.x;var cosTheta2: f32=1.-u.y;var cosTheta: f32=sqrt(cosTheta2);var sinTheta: f32=sqrt(1.-cosTheta2);return vec3f(sinTheta*cos(phi),sinTheta*sin(phi),cosTheta);}\nfn hemisphereImportanceSampleDggx(u: vec2f,a: f32)->vec3f {var phi: f32=2.*PI*u.x;var cosTheta2: f32=(1.-u.y)/(1.+(a+1.)*((a-1.)*u.y));var cosTheta: f32=sqrt(cosTheta2);var sinTheta: f32=sqrt(1.-cosTheta2);return vec3f(sinTheta*cos(phi),sinTheta*sin(phi),cosTheta);}\nfn hemisphereImportanceSampleDCharlie(u: vec2f,a: f32)->vec3f { \nvar phi: f32=2.*PI*u.x;var sinTheta: f32=pow(u.y,a/(2.*a+1.));var cosTheta: f32=sqrt(1.-sinTheta*sinTheta);return vec3f(sinTheta*cos(phi),sinTheta*sin(phi),cosTheta);}");const f="hdrFilteringFunctions";e.IncludesShadersStoreWGSL[f]||(e.IncludesShadersStoreWGSL[f]="#ifdef NUM_SAMPLES\n#if NUM_SAMPLES>0\nfn radicalInverse_VdC(value: u32)->f32 \n{var bits=(value<<16u) | (value>>16u);bits=((bits & 0x55555555u)<<1u) | ((bits & 0xAAAAAAAAu)>>1u);bits=((bits & 0x33333333u)<<2u) | ((bits & 0xCCCCCCCCu)>>2u);bits=((bits & 0x0F0F0F0Fu)<<4u) | ((bits & 0xF0F0F0F0u)>>4u);bits=((bits & 0x00FF00FFu)<<8u) | ((bits & 0xFF00FF00u)>>8u);return f32(bits)*2.3283064365386963e-10; }\nfn hammersley(i: u32,N: u32)->vec2f\n{return vec2f( f32(i)/ f32(N),radicalInverse_VdC(i));}\nfn log4(x: f32)->f32 {return log2(x)/2.;}\nfn uv_to_normal(uv: vec2f)->vec3f {var N: vec3f;var uvRange: vec2f=uv;var theta: f32=uvRange.x*2.0*PI;var phi: f32=uvRange.y*PI;N.x=cos(theta)*sin(phi);N.z=sin(theta)*sin(phi);N.y=cos(phi);return N;}\nconst NUM_SAMPLES_FLOAT: f32= f32(NUM_SAMPLES);const NUM_SAMPLES_FLOAT_INVERSED: f32=1./NUM_SAMPLES_FLOAT;const K: f32=4.;fn irradiance(\n#ifdef CUSTOM_IRRADIANCE_FILTERING_INPUT\nCUSTOM_IRRADIANCE_FILTERING_INPUT\n#else\ninputTexture: texture_cube<f32>,inputSampler: sampler,\n#endif\ninputN: vec3f,\nfilteringInfo: vec2f,\ndiffuseRoughness: f32,\nsurfaceAlbedo: vec3f,\ninputV: vec3f\n#ifdef IBL_CDF_FILTERING\n,icdfSampler: texture_2d<f32>,icdfSamplerSampler: sampler\n#endif\n)->vec3f\n{var n: vec3f=normalize(inputN);var result: vec3f= vec3f(0.0);\n#ifndef IBL_CDF_FILTERING\nvar tangent: vec3f=select(vec3f(1.,0.,0.),vec3f(0.,0.,1.),abs(n.z)<0.999);tangent=normalize(cross(tangent,n));var bitangent: vec3f=cross(n,tangent);var tbn: mat3x3f= mat3x3f(tangent,bitangent,n);var tbnInverse: mat3x3f=transpose(tbn);\n#endif\nvar maxLevel: f32=filteringInfo.y;var dim0: f32=filteringInfo.x;var omegaP: f32=(4.*PI)/(6.*dim0*dim0);var clampedAlbedo: vec3f=clamp(surfaceAlbedo,vec3f(0.1),vec3f(1.0));for(var i: u32=0u; i<NUM_SAMPLES; i++)\n{var Xi: vec2f=hammersley(i,NUM_SAMPLES);\n#ifdef IBL_CDF_FILTERING\nvar T: vec2f;T.x=textureSampleLevel(icdfSampler,icdfSamplerSampler,vec2(Xi.x,0.0),0.0).x;T.y=textureSampleLevel(icdfSampler,icdfSamplerSampler,vec2(T.x,Xi.y),0.0).y;var Ls: vec3f=uv_to_normal(vec2f(1.0-fract(T.x+0.25),T.y));var NoL: f32=dot(n,Ls);var NoV: f32=dot(n,inputV);\n#if BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_EON\nvar LoV: f32=dot(Ls,inputV);\n#elif BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_BURLEY\nvar H: vec3f=(inputV+Ls)*0.5;var VoH: f32=dot(inputV,H);\n#endif \n#else\nvar Ls: vec3f=hemisphereCosSample(Xi);Ls=normalize(Ls);var Ns: vec3f= vec3f(0.,0.,1.);var NoL: f32=dot(Ns,Ls);var V: vec3f=tbnInverse*inputV;var NoV: f32=dot(Ns,V);\n#if BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_EON\nvar LoV: f32=dot(Ls,V);\n#elif BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_BURLEY\nvar H: vec3f=(V+Ls)*0.5;var VoH: f32=dot(V,H);\n#endif\n#endif\nif (NoL>0.) {\n#ifdef IBL_CDF_FILTERING\nvar pdf: f32=textureSampleLevel(icdfSampler,icdfSamplerSampler,T,0.0).z;var c: vec3f=textureSampleLevel(inputTexture,inputSampler,Ls,0.0).rgb;\n#else\nvar pdf_inversed: f32=PI/NoL;var omegaS: f32=NUM_SAMPLES_FLOAT_INVERSED*pdf_inversed;var l: f32=log4(omegaS)-log4(omegaP)+log4(K);var mipLevel: f32=clamp(l,0.0,maxLevel);\n#ifdef CUSTOM_IRRADIANCE_FILTERING_FUNCTION\nCUSTOM_IRRADIANCE_FILTERING_FUNCTION\n#else\nvar c: vec3f=textureSampleLevel(inputTexture,inputSampler,tbn*Ls,mipLevel).rgb;\n#endif\n#endif\n#ifdef GAMMA_INPUT\nc=toLinearSpaceVec3(c);\n#endif\nvar diffuseRoughnessTerm: vec3f=vec3f(1.0);\n#if BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_EON\ndiffuseRoughnessTerm=diffuseBRDF_EON(clampedAlbedo,diffuseRoughness,NoL,NoV,LoV)*PI;\n#elif BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_BURLEY\ndiffuseRoughnessTerm=vec3f(diffuseBRDF_Burley(NoL,NoV,VoH,diffuseRoughness)*PI);\n#endif\n#ifdef IBL_CDF_FILTERING\nvar light: vec3f=vec3f(0.0);if (pdf>1e-6) {light=vec3f(1.0)/vec3f(pdf)*c;}\nresult+=NoL*diffuseRoughnessTerm*light;\n#else\nresult+=c*diffuseRoughnessTerm;\n#endif\n}}\nresult=result*NUM_SAMPLES_FLOAT_INVERSED;\n#if BASE_DIFFUSE_MODEL==BRDF_DIFFUSE_MODEL_EON\nresult=result/clampedAlbedo;\n#endif\nreturn result;}\nfn radiance(alphaG: f32,inputTexture: texture_cube<f32>,inputSampler: sampler,inputN: vec3f,filteringInfo: vec2f)->vec3f\n{var n: vec3f=normalize(inputN);var c: vec3f=textureSample(inputTexture,inputSampler,n).rgb; \nif (alphaG==0.) {\n#ifdef GAMMA_INPUT\nc=toLinearSpace(c);\n#endif\nreturn c;} else {var result: vec3f= vec3f(0.);var tangent: vec3f=select(vec3f(1.,0.,0.),vec3f(0.,0.,1.),abs(n.z)<0.999);tangent=normalize(cross(tangent,n));var bitangent: vec3f=cross(n,tangent);var tbn: mat3x3f= mat3x3f(tangent,bitangent,n);var maxLevel: f32=filteringInfo.y;var dim0: f32=filteringInfo.x;var omegaP: f32=(4.*PI)/(6.*dim0*dim0);var weight: f32=0.;for(var i: u32=0u; i<NUM_SAMPLES; i++)\n{var Xi: vec2f=hammersley(i,NUM_SAMPLES);var H: vec3f=hemisphereImportanceSampleDggx(Xi,alphaG);var NoV: f32=1.;var NoH: f32=H.z;var NoH2: f32=H.z*H.z;var NoL: f32=2.*NoH2-1.;var L: vec3f= vec3f(2.*NoH*H.x,2.*NoH*H.y,NoL);L=normalize(L);if (NoL>0.) {var pdf_inversed: f32=4./normalDistributionFunction_TrowbridgeReitzGGX(NoH,alphaG);var omegaS: f32=NUM_SAMPLES_FLOAT_INVERSED*pdf_inversed;var l: f32=log4(omegaS)-log4(omegaP)+log4(K);var mipLevel: f32=clamp( f32(l),0.0,maxLevel);weight+=NoL;var c: vec3f=textureSampleLevel(inputTexture,inputSampler,tbn*L,mipLevel).rgb;\n#ifdef GAMMA_INPUT\nc=toLinearSpace(c);\n#endif\nresult+=c*NoL;}}\nresult=result/weight;return result;}}\n#endif\n#endif\n");
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