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Daniel Neto
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4563 changed files with 1246712 additions and 17558 deletions
293
node_modules/three/examples/js/shaders/SSAOShader.js
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node_modules/three/examples/js/shaders/SSAOShader.js
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/**
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* References:
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* http://john-chapman-graphics.blogspot.com/2013/01/ssao-tutorial.html
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* https://learnopengl.com/Advanced-Lighting/SSAO
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* https://github.com/McNopper/OpenGL/blob/master/Example28/shader/ssao.frag.glsl
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*/
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THREE.SSAOShader = {
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defines: {
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'PERSPECTIVE_CAMERA': 1,
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'KERNEL_SIZE': 32
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},
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uniforms: {
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'tDiffuse': { value: null },
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'tNormal': { value: null },
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'tDepth': { value: null },
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'tNoise': { value: null },
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'kernel': { value: null },
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'cameraNear': { value: null },
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'cameraFar': { value: null },
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'resolution': { value: new THREE.Vector2() },
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'cameraProjectionMatrix': { value: new THREE.Matrix4() },
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'cameraInverseProjectionMatrix': { value: new THREE.Matrix4() },
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'kernelRadius': { value: 8 },
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'minDistance': { value: 0.005 },
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'maxDistance': { value: 0.05 },
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},
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vertexShader: [
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'varying vec2 vUv;',
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'void main() {',
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' vUv = uv;',
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' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
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'}'
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].join( '\n' ),
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fragmentShader: [
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'uniform sampler2D tDiffuse;',
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'uniform sampler2D tNormal;',
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'uniform sampler2D tDepth;',
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'uniform sampler2D tNoise;',
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'uniform vec3 kernel[ KERNEL_SIZE ];',
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'uniform vec2 resolution;',
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'uniform float cameraNear;',
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'uniform float cameraFar;',
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'uniform mat4 cameraProjectionMatrix;',
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'uniform mat4 cameraInverseProjectionMatrix;',
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'uniform float kernelRadius;',
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'uniform float minDistance;', // avoid artifacts caused by neighbour fragments with minimal depth difference
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'uniform float maxDistance;', // avoid the influence of fragments which are too far away
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'varying vec2 vUv;',
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'#include <packing>',
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'float getDepth( const in vec2 screenPosition ) {',
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' return texture2D( tDepth, screenPosition ).x;',
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'}',
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'float getLinearDepth( const in vec2 screenPosition ) {',
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' #if PERSPECTIVE_CAMERA == 1',
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' float fragCoordZ = texture2D( tDepth, screenPosition ).x;',
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' float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );',
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' return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );',
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' #else',
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' return texture2D( tDepth, screenPosition ).x;',
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' #endif',
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'}',
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'float getViewZ( const in float depth ) {',
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' #if PERSPECTIVE_CAMERA == 1',
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' return perspectiveDepthToViewZ( depth, cameraNear, cameraFar );',
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' #else',
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' return orthographicDepthToViewZ( depth, cameraNear, cameraFar );',
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' #endif',
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'}',
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'vec3 getViewPosition( const in vec2 screenPosition, const in float depth, const in float viewZ ) {',
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' float clipW = cameraProjectionMatrix[2][3] * viewZ + cameraProjectionMatrix[3][3];',
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' vec4 clipPosition = vec4( ( vec3( screenPosition, depth ) - 0.5 ) * 2.0, 1.0 );',
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' clipPosition *= clipW; // unprojection.',
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' return ( cameraInverseProjectionMatrix * clipPosition ).xyz;',
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'}',
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'vec3 getViewNormal( const in vec2 screenPosition ) {',
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' return unpackRGBToNormal( texture2D( tNormal, screenPosition ).xyz );',
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'}',
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'void main() {',
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' float depth = getDepth( vUv );',
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' float viewZ = getViewZ( depth );',
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' vec3 viewPosition = getViewPosition( vUv, depth, viewZ );',
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' vec3 viewNormal = getViewNormal( vUv );',
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' vec2 noiseScale = vec2( resolution.x / 4.0, resolution.y / 4.0 );',
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' vec3 random = texture2D( tNoise, vUv * noiseScale ).xyz;',
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// compute matrix used to reorient a kernel vector
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' vec3 tangent = normalize( random - viewNormal * dot( random, viewNormal ) );',
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' vec3 bitangent = cross( viewNormal, tangent );',
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' mat3 kernelMatrix = mat3( tangent, bitangent, viewNormal );',
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' float occlusion = 0.0;',
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' for ( int i = 0; i < KERNEL_SIZE; i ++ ) {',
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' vec3 sampleVector = kernelMatrix * kernel[ i ];', // reorient sample vector in view space
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' vec3 samplePoint = viewPosition + ( sampleVector * kernelRadius );', // calculate sample point
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' vec4 samplePointNDC = cameraProjectionMatrix * vec4( samplePoint, 1.0 );', // project point and calculate NDC
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' samplePointNDC /= samplePointNDC.w;',
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' vec2 samplePointUv = samplePointNDC.xy * 0.5 + 0.5;', // compute uv coordinates
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' float realDepth = getLinearDepth( samplePointUv );', // get linear depth from depth texture
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' float sampleDepth = viewZToOrthographicDepth( samplePoint.z, cameraNear, cameraFar );', // compute linear depth of the sample view Z value
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' float delta = sampleDepth - realDepth;',
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' if ( delta > minDistance && delta < maxDistance ) {', // if fragment is before sample point, increase occlusion
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' occlusion += 1.0;',
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' }',
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' }',
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' occlusion = clamp( occlusion / float( KERNEL_SIZE ), 0.0, 1.0 );',
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' gl_FragColor = vec4( vec3( 1.0 - occlusion ), 1.0 );',
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'}'
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].join( '\n' )
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};
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THREE.SSAODepthShader = {
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defines: {
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'PERSPECTIVE_CAMERA': 1
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},
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uniforms: {
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'tDepth': { value: null },
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'cameraNear': { value: null },
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'cameraFar': { value: null },
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},
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vertexShader: [
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'varying vec2 vUv;',
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'void main() {',
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' vUv = uv;',
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' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
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'}'
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].join( '\n' ),
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fragmentShader: [
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'uniform sampler2D tDepth;',
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'uniform float cameraNear;',
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'uniform float cameraFar;',
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'varying vec2 vUv;',
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'#include <packing>',
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'float getLinearDepth( const in vec2 screenPosition ) {',
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' #if PERSPECTIVE_CAMERA == 1',
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' float fragCoordZ = texture2D( tDepth, screenPosition ).x;',
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' float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );',
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' return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );',
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' #else',
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' return texture2D( tDepth, screenPosition ).x;',
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' #endif',
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'}',
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'void main() {',
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' float depth = getLinearDepth( vUv );',
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' gl_FragColor = vec4( vec3( 1.0 - depth ), 1.0 );',
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'}'
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].join( '\n' )
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};
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THREE.SSAOBlurShader = {
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uniforms: {
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'tDiffuse': { value: null },
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'resolution': { value: new THREE.Vector2() }
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},
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vertexShader: [
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'varying vec2 vUv;',
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'void main() {',
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' vUv = uv;',
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' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
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'}'
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].join( '\n' ),
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fragmentShader: [
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'uniform sampler2D tDiffuse;',
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'uniform vec2 resolution;',
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'varying vec2 vUv;',
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'void main() {',
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' vec2 texelSize = ( 1.0 / resolution );',
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' float result = 0.0;',
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' for ( int i = - 2; i <= 2; i ++ ) {',
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' for ( int j = - 2; j <= 2; j ++ ) {',
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' vec2 offset = ( vec2( float( i ), float( j ) ) ) * texelSize;',
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' result += texture2D( tDiffuse, vUv + offset ).r;',
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' }',
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' }',
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' gl_FragColor = vec4( vec3( result / ( 5.0 * 5.0 ) ), 1.0 );',
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'}'
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].join( '\n' )
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};
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