// Do not edit.
import { ShaderStore } from "../Engines/shaderStore.js";
const name = "rsmGlobalIlluminationPixelShader";
const shader = `/**
* The implementation is an application of the formula found in http:
* For better results,it also adds a random (noise) rotation to the RSM samples (the noise artifacts are easier to remove than the banding artifacts).
*/
precision highp float;varying vec2 vUV;uniform mat4 rsmLightMatrix;uniform vec4 rsmInfo;uniform vec4 rsmInfo2;uniform sampler2D textureSampler;uniform sampler2D normalSampler;uniform sampler2D rsmPositionW;uniform sampler2D rsmNormalW;uniform sampler2D rsmFlux;uniform sampler2D rsmSamples;
#ifdef TRANSFORM_NORMAL
uniform mat4 invView;
#endif
float mod289(float x){return x-floor(x*(1.0/289.0))*289.0;}
vec4 mod289(vec4 x){return x-floor(x*(1.0/289.0))*289.0;}
vec4 perm(vec4 x){return mod289(((x*34.0)+1.0)*x);}
float noise(vec3 p){vec3 a=floor(p);vec3 d=p-a;d=d*d*(3.0-2.0*d);vec4 b=a.xxyy+vec4(0.0,1.0,0.0,1.0);vec4 k1=perm(b.xyxy);vec4 k2=perm(k1.xyxy+b.zzww);vec4 c=k2+a.zzzz;vec4 k3=perm(c);vec4 k4=perm(c+1.0);vec4 o1=fract(k3*(1.0/41.0));vec4 o2=fract(k4*(1.0/41.0));vec4 o3=o2*d.z+o1*(1.0-d.z);vec2 o4=o3.yw*d.x+o3.xz*(1.0-d.x);return o4.y*d.y+o4.x*(1.0-d.y);}
vec3 computeIndirect(vec3 p,vec3 n) {vec3 indirectDiffuse=vec3(0.);int numSamples=int(rsmInfo.x);float radius=rsmInfo.y;float intensity=rsmInfo.z;float edgeArtifactCorrection=rsmInfo.w;vec4 texRSM=rsmLightMatrix*vec4(p,1.);texRSM.xy/=texRSM.w;texRSM.xy=texRSM.xy*0.5+0.5;float angle=noise(p*rsmInfo2.x);float c=cos(angle);float s=sin(angle);for (int i=0; i<numSamples; i++) {vec3 rsmSample=texelFetch(rsmSamples,ivec2(i,0),0).xyz;float weightSquare=rsmSample.z;if (rsmInfo2.y==1.0) rsmSample.xy=vec2(rsmSample.x*c+rsmSample.y*s,-rsmSample.x*s+rsmSample.y*c);vec2 uv=texRSM.xy+rsmSample.xy*radius;if (uv.x<0. || uv.x>1. || uv.y<0. || uv.y>1.) continue;vec3 vplPositionW=textureLod(rsmPositionW,uv,0.).xyz;vec3 vplNormalW=textureLod(rsmNormalW,uv,0.).xyz*2.0-1.0;vec3 vplFlux=textureLod(rsmFlux,uv,0.).rgb;vplPositionW-=vplNormalW*edgeArtifactCorrection; 
float dist2=dot(vplPositionW-p,vplPositionW-p);indirectDiffuse+=vplFlux*weightSquare*max(0.,dot(n,vplPositionW-p))*max(0.,dot(vplNormalW,p-vplPositionW))/(dist2*dist2);}
return clamp(indirectDiffuse*intensity,0.0,1.0);}
void main(void) 
{vec3 positionW=texture2D(textureSampler,vUV).xyz;vec3 normalW=texture2D(normalSampler,vUV).xyz;
#ifdef DECODE_NORMAL
normalW=normalW*2.0-1.0;
#endif
#ifdef TRANSFORM_NORMAL
normalW=(invView*vec4(normalW,0.)).xyz;
#endif
gl_FragColor.rgb=computeIndirect(positionW,normalW);gl_FragColor.a=1.0;}
`;
// Sideeffect
ShaderStore.ShadersStore[name] = shader;
/** @internal */
export const rsmGlobalIlluminationPixelShader = { name, shader };
//# sourceMappingURL=rsmGlobalIllumination.fragment.js.map