three-stdlib/shaders/ParallaxShader.cjs.map

stand-alone library of threejs examples

{"version":3,"file":"ParallaxShader.cjs","sources":["../../src/shaders/ParallaxShader.ts"],"sourcesContent":["// Parallax Occlusion shaders from\n//    http://sunandblackcat.com/tipFullView.php?topicid=28\n// No tangent-space transforms logic based on\n//   http://mmikkelsen3d.blogspot.sk/2012/02/parallaxpoc-mapping-and-no-tangent.html\n\nexport const ParallaxShader = {\n  // Ordered from fastest to best quality.\n  modes: {\n    none: 'NO_PARALLAX',\n    basic: 'USE_BASIC_PARALLAX',\n    steep: 'USE_STEEP_PARALLAX',\n    occlusion: 'USE_OCLUSION_PARALLAX', // a.k.a. POM\n    relief: 'USE_RELIEF_PARALLAX',\n  },\n\n  uniforms: {\n    bumpMap: { value: null },\n    map: { value: null },\n    parallaxScale: { value: null },\n    parallaxMinLayers: { value: null },\n    parallaxMaxLayers: { value: null },\n  },\n\n  vertexShader: [\n    'varying vec2 vUv;',\n    'varying vec3 vViewPosition;',\n    'varying vec3 vNormal;',\n\n    'void main() {',\n\n    '\tvUv = uv;',\n    '\tvec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );',\n    '\tvViewPosition = -mvPosition.xyz;',\n    '\tvNormal = normalize( normalMatrix * normal );',\n    '\tgl_Position = projectionMatrix * mvPosition;',\n\n    '}',\n  ].join('\\n'),\n\n  fragmentShader: [\n    'uniform sampler2D bumpMap;',\n    'uniform sampler2D map;',\n\n    'uniform float parallaxScale;',\n    'uniform float parallaxMinLayers;',\n    'uniform float parallaxMaxLayers;',\n\n    'varying vec2 vUv;',\n    'varying vec3 vViewPosition;',\n    'varying vec3 vNormal;',\n\n    '#ifdef USE_BASIC_PARALLAX',\n\n    '\tvec2 parallaxMap( in vec3 V ) {',\n\n    '\t\tfloat initialHeight = texture2D( bumpMap, vUv ).r;',\n\n    // No Offset Limitting: messy, floating output at grazing angles.\n    //\"vec2 texCoordOffset = parallaxScale * V.xy / V.z * initialHeight;\",\n\n    // Offset Limiting\n    '\t\tvec2 texCoordOffset = parallaxScale * V.xy * initialHeight;',\n    '\t\treturn vUv - texCoordOffset;',\n\n    '\t}',\n\n    '#else',\n\n    '\tvec2 parallaxMap( in vec3 V ) {',\n\n    // Determine number of layers from angle between V and N\n    '\t\tfloat numLayers = mix( parallaxMaxLayers, parallaxMinLayers, abs( dot( vec3( 0.0, 0.0, 1.0 ), V ) ) );',\n\n    '\t\tfloat layerHeight = 1.0 / numLayers;',\n    '\t\tfloat currentLayerHeight = 0.0;',\n    // Shift of texture coordinates for each iteration\n    '\t\tvec2 dtex = parallaxScale * V.xy / V.z / numLayers;',\n\n    '\t\tvec2 currentTextureCoords = vUv;',\n\n    '\t\tfloat heightFromTexture = texture2D( bumpMap, currentTextureCoords ).r;',\n\n    // while ( heightFromTexture > currentLayerHeight )\n    // Infinite loops are not well supported. Do a \"large\" finite\n    // loop, but not too large, as it slows down some compilers.\n    '\t\tfor ( int i = 0; i < 30; i += 1 ) {',\n    '\t\t\tif ( heightFromTexture <= currentLayerHeight ) {',\n    '\t\t\t\tbreak;',\n    '\t\t\t}',\n    '\t\t\tcurrentLayerHeight += layerHeight;',\n    // Shift texture coordinates along vector V\n    '\t\t\tcurrentTextureCoords -= dtex;',\n    '\t\t\theightFromTexture = texture2D( bumpMap, currentTextureCoords ).r;',\n    '\t\t}',\n\n    '\t\t#ifdef USE_STEEP_PARALLAX',\n\n    '\t\t\treturn currentTextureCoords;',\n\n    '\t\t#elif defined( USE_RELIEF_PARALLAX )',\n\n    '\t\t\tvec2 deltaTexCoord = dtex / 2.0;',\n    '\t\t\tfloat deltaHeight = layerHeight / 2.0;',\n\n    // Return to the mid point of previous layer\n    '\t\t\tcurrentTextureCoords += deltaTexCoord;',\n    '\t\t\tcurrentLayerHeight -= deltaHeight;',\n\n    // Binary search to increase precision of Steep Parallax Mapping\n    '\t\t\tconst int numSearches = 5;',\n    '\t\t\tfor ( int i = 0; i < numSearches; i += 1 ) {',\n\n    '\t\t\t\tdeltaTexCoord /= 2.0;',\n    '\t\t\t\tdeltaHeight /= 2.0;',\n    '\t\t\t\theightFromTexture = texture2D( bumpMap, currentTextureCoords ).r;',\n    // Shift along or against vector V\n    '\t\t\t\tif( heightFromTexture > currentLayerHeight ) {', // Below the surface\n\n    '\t\t\t\t\tcurrentTextureCoords -= deltaTexCoord;',\n    '\t\t\t\t\tcurrentLayerHeight += deltaHeight;',\n\n    '\t\t\t\t} else {', // above the surface\n\n    '\t\t\t\t\tcurrentTextureCoords += deltaTexCoord;',\n    '\t\t\t\t\tcurrentLayerHeight -= deltaHeight;',\n\n    '\t\t\t\t}',\n\n    '\t\t\t}',\n    '\t\t\treturn currentTextureCoords;',\n\n    '\t\t#elif defined( USE_OCLUSION_PARALLAX )',\n\n    '\t\t\tvec2 prevTCoords = currentTextureCoords + dtex;',\n\n    // Heights for linear interpolation\n    '\t\t\tfloat nextH = heightFromTexture - currentLayerHeight;',\n    '\t\t\tfloat prevH = texture2D( bumpMap, prevTCoords ).r - currentLayerHeight + layerHeight;',\n\n    // Proportions for linear interpolation\n    '\t\t\tfloat weight = nextH / ( nextH - prevH );',\n\n    // Interpolation of texture coordinates\n    '\t\t\treturn prevTCoords * weight + currentTextureCoords * ( 1.0 - weight );',\n\n    '\t\t#else', // NO_PARALLAX\n\n    '\t\t\treturn vUv;',\n\n    '\t\t#endif',\n\n    '\t}',\n    '#endif',\n\n    'vec2 perturbUv( vec3 surfPosition, vec3 surfNormal, vec3 viewPosition ) {',\n\n    '\tvec2 texDx = dFdx( vUv );',\n    '\tvec2 texDy = dFdy( vUv );',\n\n    '\tvec3 vSigmaX = dFdx( surfPosition );',\n    '\tvec3 vSigmaY = dFdy( surfPosition );',\n    '\tvec3 vR1 = cross( vSigmaY, surfNormal );',\n    '\tvec3 vR2 = cross( surfNormal, vSigmaX );',\n    '\tfloat fDet = dot( vSigmaX, vR1 );',\n\n    '\tvec2 vProjVscr = ( 1.0 / fDet ) * vec2( dot( vR1, viewPosition ), dot( vR2, viewPosition ) );',\n    '\tvec3 vProjVtex;',\n    '\tvProjVtex.xy = texDx * vProjVscr.x + texDy * vProjVscr.y;',\n    '\tvProjVtex.z = dot( surfNormal, viewPosition );',\n\n    '\treturn parallaxMap( vProjVtex );',\n    '}',\n\n    'void main() {',\n\n    '\tvec2 mapUv = perturbUv( -vViewPosition, normalize( vNormal ), normalize( vViewPosition ) );',\n    '\tgl_FragColor = texture2D( map, mapUv );',\n\n    '}',\n  ].join('\\n'),\n}\n"],"names":[],"mappings":";;AAKO,MAAM,iBAAiB;AAAA;AAAA,EAE5B,OAAO;AAAA,IACL,MAAM;AAAA,IACN,OAAO;AAAA,IACP,OAAO;AAAA,IACP,WAAW;AAAA;AAAA,IACX,QAAQ;AAAA,EACV;AAAA,EAEA,UAAU;AAAA,IACR,SAAS,EAAE,OAAO,KAAK;AAAA,IACvB,KAAK,EAAE,OAAO,KAAK;AAAA,IACnB,eAAe,EAAE,OAAO,KAAK;AAAA,IAC7B,mBAAmB,EAAE,OAAO,KAAK;AAAA,IACjC,mBAAmB,EAAE,OAAO,KAAK;AAAA,EACnC;AAAA,EAEA,cAAc;AAAA,IACZ;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,EAAA,EACA,KAAK,IAAI;AAAA,EAEX,gBAAgB;AAAA,IACd;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA;AAAA;AAAA;AAAA,IAMA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA;AAAA,IAGA;AAAA,IAEA;AAAA,IACA;AAAA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA;AAAA;AAAA;AAAA,IAKA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA;AAAA,IAGA;AAAA,IACA;AAAA;AAAA,IAGA;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA;AAAA,IAEA;AAAA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA;AAAA,IAGA;AAAA,IACA;AAAA;AAAA,IAGA;AAAA;AAAA,IAGA;AAAA,IAEA;AAAA;AAAA,IAEA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IACA;AAAA,IACA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,IAEA;AAAA,IACA;AAAA,IAEA;AAAA,EAAA,EACA,KAAK,IAAI;AACb;;"}