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/**
* @author Mugen87 / https://github.com/Mugen87
*
* References:
* http://john-chapman-graphics.blogspot.com/2013/01/ssao-tutorial.html
* https://learnopengl.com/Advanced-Lighting/SSAO
* https://github.com/McNopper/OpenGL/blob/master/Example28/shader/ssao.frag.glsl
*/
THREE.SSAOShader = {
defines: {
"PERSPECTIVE_CAMERA": 1,
"KERNEL_SIZE": 32
},
uniforms: {
"tDiffuse": { value: null },
"tNormal": { value: null },
"tDepth": { value: null },
"tNoise": { value: null },
"kernel": { value: null },
"cameraNear": { value: null },
"cameraFar": { value: null },
"resolution": { value: new THREE.Vector2() },
"cameraProjectionMatrix": { value: new THREE.Matrix4() },
"cameraInverseProjectionMatrix": { value: new THREE.Matrix4() },
"kernelRadius": { value: 8 },
"minDistance": { value: 0.005 },
"maxDistance": { value: 0.05 },
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
" vUv = uv;",
" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join( "\n" ),
fragmentShader: [
"uniform sampler2D tDiffuse;",
"uniform sampler2D tNormal;",
"uniform sampler2D tDepth;",
"uniform sampler2D tNoise;",
"uniform vec3 kernel[ KERNEL_SIZE ];",
"uniform vec2 resolution;",
"uniform float cameraNear;",
"uniform float cameraFar;",
"uniform mat4 cameraProjectionMatrix;",
"uniform mat4 cameraInverseProjectionMatrix;",
"uniform float kernelRadius;",
"uniform float minDistance;", // avoid artifacts caused by neighbour fragments with minimal depth difference
"uniform float maxDistance;", // avoid the influence of fragments which are too far away
"varying vec2 vUv;",
"#include <packing>",
"float getDepth( const in vec2 screenPosition ) {",
" return texture2D( tDepth, screenPosition ).x;",
"}",
"float getLinearDepth( const in vec2 screenPosition ) {",
" #if PERSPECTIVE_CAMERA == 1",
" float fragCoordZ = texture2D( tDepth, screenPosition ).x;",
" float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );",
" return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );",
" #else",
" return texture2D( depthSampler, coord ).x;",
" #endif",
"}",
"float getViewZ( const in float depth ) {",
" #if PERSPECTIVE_CAMERA == 1",
" return perspectiveDepthToViewZ( depth, cameraNear, cameraFar );",
" #else",
" return orthographicDepthToViewZ( depth, cameraNear, cameraFar );",
" #endif",
"}",
"vec3 getViewPosition( const in vec2 screenPosition, const in float depth, const in float viewZ ) {",
" float clipW = cameraProjectionMatrix[2][3] * viewZ + cameraProjectionMatrix[3][3];",
" vec4 clipPosition = vec4( ( vec3( screenPosition, depth ) - 0.5 ) * 2.0, 1.0 );",
" clipPosition *= clipW; // unprojection.",
" return ( cameraInverseProjectionMatrix * clipPosition ).xyz;",
"}",
"vec3 getViewNormal( const in vec2 screenPosition ) {",
" return unpackRGBToNormal( texture2D( tNormal, screenPosition ).xyz );",
"}",
"void main() {",
" float depth = getDepth( vUv );",
" float viewZ = getViewZ( depth );",
" vec3 viewPosition = getViewPosition( vUv, depth, viewZ );",
" vec3 viewNormal = getViewNormal( vUv );",
" vec2 noiseScale = vec2( resolution.x / 4.0, resolution.y / 4.0 );",
" vec3 random = texture2D( tNoise, vUv * noiseScale ).xyz;",
// compute matrix used to reorient a kernel vector
" vec3 tangent = normalize( random - viewNormal * dot( random, viewNormal ) );",
" vec3 bitangent = cross( viewNormal, tangent );",
" mat3 kernelMatrix = mat3( tangent, bitangent, viewNormal );",
" float occlusion = 0.0;",
" for ( int i = 0; i < KERNEL_SIZE; i ++ ) {",
" vec3 sampleVector = kernelMatrix * kernel[ i ];", // reorient sample vector in view space
" vec3 samplePoint = viewPosition + ( sampleVector * kernelRadius );", // calculate sample point
" vec4 samplePointNDC = cameraProjectionMatrix * vec4( samplePoint, 1.0 );", // project point and calculate NDC
" samplePointNDC /= samplePointNDC.w;",
" vec2 samplePointUv = samplePointNDC.xy * 0.5 + 0.5;", // compute uv coordinates
" float realDepth = getLinearDepth( samplePointUv );", // get linear depth from depth texture
" float sampleDepth = viewZToOrthographicDepth( samplePoint.z, cameraNear, cameraFar );", // compute linear depth of the sample view Z value
" float delta = sampleDepth - realDepth;",
" if ( delta > minDistance && delta < maxDistance ) {", // if fragment is before sample point, increase occlusion
" occlusion += 1.0;",
" }",
" }",
" occlusion = clamp( occlusion / float( KERNEL_SIZE ), 0.0, 1.0 );",
" gl_FragColor = vec4( vec3( 1.0 - occlusion ), 1.0 );",
"}"
].join( "\n" )
};
THREE.SSAODepthShader = {
defines: {
"PERSPECTIVE_CAMERA": 1
},
uniforms: {
"tDepth": { value: null },
"cameraNear": { value: null },
"cameraFar": { value: null },
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
" vUv = uv;",
" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join( "\n" ),
fragmentShader: [
"uniform sampler2D tDepth;",
"uniform float cameraNear;",
"uniform float cameraFar;",
"varying vec2 vUv;",
"#include <packing>",
"float getLinearDepth( const in vec2 screenPosition ) {",
" #if PERSPECTIVE_CAMERA == 1",
" float fragCoordZ = texture2D( tDepth, screenPosition ).x;",
" float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );",
" return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );",
" #else",
" return texture2D( depthSampler, coord ).x;",
" #endif",
"}",
"void main() {",
" float depth = getLinearDepth( vUv );",
" gl_FragColor = vec4( vec3( 1.0 - depth ), 1.0 );",
"}"
].join( "\n" )
};
THREE.SSAOBlurShader = {
uniforms: {
"tDiffuse": { value: null },
"resolution": { value: new THREE.Vector2() }
},
vertexShader: [
"varying vec2 vUv;",
"void main() {",
" vUv = uv;",
" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
"}"
].join( "\n" ),
fragmentShader: [
"uniform sampler2D tDiffuse;",
"uniform vec2 resolution;",
"varying vec2 vUv;",
"void main() {",
" vec2 texelSize = ( 1.0 / resolution );",
" float result = 0.0;",
" for ( int i = - 2; i <= 2; i ++ ) {",
" for ( int j = - 2; j <= 2; j ++ ) {",
" vec2 offset = ( vec2( float( i ), float( j ) ) ) * texelSize;",
" result += texture2D( tDiffuse, vUv + offset ).r;",
" }",
" }",
" gl_FragColor = vec4( vec3( result / ( 5.0 * 5.0 ) ), 1.0 );",
"}"
].join( "\n" )
};
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