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{"version":3,"file":"SSRShader.cjs","sources":["../../src/shaders/SSRShader.ts"],"sourcesContent":["import { Matrix4, Vector2 } from 'three'\n/**\n * References:\n * https://lettier.github.io/3d-game-shaders-for-beginners/screen-space-reflection.html\n */\n\nexport const SSRShader = {\n defines: {\n MAX_STEP: 0,\n isPerspectiveCamera: true,\n isDistanceAttenuation: true,\n isFresnel: true,\n isInfiniteThick: false,\n isSelective: false,\n },\n\n uniforms: {\n tDiffuse: { value: null },\n tNormal: { value: null },\n tMetalness: { value: null },\n tDepth: { value: null },\n cameraNear: { value: null },\n cameraFar: { value: null },\n resolution: { value: /* @__PURE__ */ new Vector2() },\n cameraProjectionMatrix: { value: /* @__PURE__ */ new Matrix4() },\n cameraInverseProjectionMatrix: { value: /* @__PURE__ */ new Matrix4() },\n opacity: { value: 0.5 },\n maxDistance: { value: 180 },\n cameraRange: { value: 0 },\n surfDist: { value: 0.007 },\n thickTolerance: { value: 0.03 },\n },\n\n vertexShader: /* glsl */ `\n\n varying vec2 vUv;\n\n void main() {\n\n\t\t\tvUv = uv;\n\n\t\t\tgl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );\n\n }\n\n `,\n\n fragmentShader: /* glsl */ `\n\t\t// precision highp float;\n\t\tprecision highp sampler2D;\n\t\tvarying vec2 vUv;\n\t\tuniform sampler2D tDepth;\n\t\tuniform sampler2D tNormal;\n\t\tuniform sampler2D tMetalness;\n\t\tuniform sampler2D tDiffuse;\n\t\tuniform float cameraRange;\n\t\tuniform vec2 resolution;\n\t\tuniform float opacity;\n\t\tuniform float cameraNear;\n\t\tuniform float cameraFar;\n\t\tuniform float maxDistance;\n\t\tuniform float surfDist;\n\t\tuniform mat4 cameraProjectionMatrix;\n\t\tuniform mat4 cameraInverseProjectionMatrix;\n\t\tuniform float thickTolerance;\n\t\t#include <packing>\n\t\tfloat pointToLineDistance(vec3 x0, vec3 x1, vec3 x2) {\n\t\t\t//x0: point, x1: linePointA, x2: linePointB\n\t\t\t//https://mathworld.wolfram.com/Point-LineDistance3-Dimensional.html\n\t\t\treturn length(cross(x0-x1,x0-x2))/length(x2-x1);\n\t\t}\n\t\tfloat pointPlaneDistance(vec3 point,vec3 planePoint,vec3 planeNormal){\n\t\t\t// https://mathworld.wolfram.com/Point-PlaneDistance.html\n\t\t\t//// https://en.wikipedia.org/wiki/Plane_(geometry)\n\t\t\t//// http://paulbourke.net/geometry/pointlineplane/\n\t\t\tfloat a=planeNormal.x,b=planeNormal.y,c=planeNormal.z;\n\t\t\tfloat x0=point.x,y0=point.y,z0=point.z;\n\t\t\tfloat x=planePoint.x,y=planePoint.y,z=planePoint.z;\n\t\t\tfloat d=-(a*x+b*y+c*z);\n\t\t\tfloat distance=(a*x0+b*y0+c*z0+d)/sqrt(a*a+b*b+c*c);\n\t\t\treturn distance;\n\t\t}\n\t\tfloat getDepth( const in vec2 uv ) {\n\t\t\treturn texture2D( tDepth, uv ).x;\n\t\t}\n\t\tfloat getViewZ( const in float depth ) {\n\t\t\t#ifdef isPerspectiveCamera\n\t\t\t\treturn perspectiveDepthToViewZ( depth, cameraNear, cameraFar );\n\t\t\t#else\n\t\t\t\treturn orthographicDepthToViewZ( depth, cameraNear, cameraFar );\n\t\t\t#endif\n\t\t}\n\t\tvec3 getViewPosition( const in vec2 uv, const in float depth/*clip space*/, const in float clipW ) {\n\t\t\tvec4 clipPosition = vec4( ( vec3( uv, depth ) - 0.5 ) * 2.0, 1.0 );//ndc\n\t\t\tclipPosition *= clipW; //clip\n\t\t\treturn ( cameraInverseProjectionMatrix * clipPosition ).xyz;//view\n\t\t}\n\t\tvec3 getViewNormal( const in vec2 uv ) {\n\t\t\treturn unpackRGBToNormal( texture2D( tNormal, uv ).xyz );\n\t\t}\n\t\tvec2 viewPositionToXY(vec3 viewPosition){\n\t\t\tvec2 xy;\n\t\t\tvec4 clip=cameraProjectionMatrix*vec4(viewPosition,1);\n\t\t\txy=clip.xy;//clip\n\t\t\tfloat clipW=clip.w;\n\t\t\txy/=clipW;//NDC\n\t\t\txy=(xy+1.)/2.;//uv\n\t\t\txy*=resolution;//screen\n\t\t\treturn xy;\n\t\t}\n\t\tvoid main(){\n\t\t\t#ifdef isSelective\n\t\t\t\tfloat metalness=texture2D(tMetalness,vUv).r;\n\t\t\t\tif(metalness==0.) return;\n\t\t\t#endif\n\n\t\t\tfloat depth = getDepth( vUv );\n\t\t\tfloat viewZ = getViewZ( depth );\n\t\t\tif(-viewZ>=cameraFar) return;\n\n\t\t\tfloat clipW = cameraProjectionMatrix[2][3] * viewZ+cameraProjectionMatrix[3][3];\n\t\t\tvec3 viewPos
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