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- /**
- * Afterimage shader
- * I created this effect inspired by a demo on codepen:
- * https://codepen.io/brunoimbrizi/pen/MoRJaN?page=1&
- */
- THREE.AfterimageShader = {
- uniforms: {
- 'damp': { value: 0.96 },
- 'tOld': { value: null },
- 'tNew': { value: null }
- },
- vertexShader: [
- 'varying vec2 vUv;',
- 'void main() {',
- ' vUv = uv;',
- ' gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
- '}'
- ].join( '\n' ),
- fragmentShader: [
- 'uniform float damp;',
- 'uniform sampler2D tOld;',
- 'uniform sampler2D tNew;',
- 'varying vec2 vUv;',
- 'vec4 when_gt( vec4 x, float y ) {',
- ' return max( sign( x - y ), 0.0 );',
- '}',
- 'void main() {',
- ' vec4 texelOld = texture2D( tOld, vUv );',
- ' vec4 texelNew = texture2D( tNew, vUv );',
- ' texelOld *= damp * when_gt( texelOld, 0.1 );',
- ' gl_FragColor = max(texelNew, texelOld);',
- '}'
- ].join( '\n' )
- };
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