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61 lines
977 B
61 lines
977 B
/**
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* @author HypnosNova / https://www.threejs.org.cn/gallery/
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*
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* Afterimage shader
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* I created this effect inspired by a demo on codepen:
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* https://codepen.io/brunoimbrizi/pen/MoRJaN?page=1&
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*/
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THREE.AfterimageShader = {
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uniforms: {
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"damp": { value: 0.96 },
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"tOld": { value: null },
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"tNew": { 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 float damp;",
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"uniform sampler2D tOld;",
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"uniform sampler2D tNew;",
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"varying vec2 vUv;",
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"vec4 when_gt( vec4 x, float y ) {",
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"return max( sign( x - y ), 0.0 );",
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"}",
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"void main() {",
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"vec4 texelOld = texture2D( tOld, vUv );",
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"vec4 texelNew = texture2D( tNew, vUv );",
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"texelOld *= damp * when_gt( texelOld, 0.1 );",
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"gl_FragColor = max(texelNew, texelOld);",
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"}"
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].join( "\n" )
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};
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