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/**
* @author HypnosNova / https://www.threejs.org.cn/gallery/
*/
THREE.AfterimagePass = function ( damp ) {
THREE.Pass.call( this );
if ( THREE.AfterimageShader === undefined )
console.error( "THREE.AfterimagePass relies on THREE.AfterimageShader" );
this.shader = THREE.AfterimageShader;
this.uniforms = THREE.UniformsUtils.clone( this.shader.uniforms );
this.uniforms[ "damp" ].value = damp !== undefined ? damp : 0.96;
this.textureComp = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, {
minFilter: THREE.LinearFilter,
magFilter: THREE.NearestFilter,
format: THREE.RGBAFormat
} );
this.textureOld = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, {
minFilter: THREE.LinearFilter,
magFilter: THREE.NearestFilter,
format: THREE.RGBAFormat
} );
this.shaderMaterial = new THREE.ShaderMaterial( {
uniforms: this.uniforms,
vertexShader: this.shader.vertexShader,
fragmentShader: this.shader.fragmentShader
} );
this.compFsQuad = new THREE.Pass.FullScreenQuad( this.shaderMaterial );
var material = new THREE.MeshBasicMaterial();
this.copyFsQuad = new THREE.Pass.FullScreenQuad( material );
};
THREE.AfterimagePass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {
constructor: THREE.AfterimagePass,
render: function ( renderer, writeBuffer, readBuffer ) {
this.uniforms[ "tOld" ].value = this.textureOld.texture;
this.uniforms[ "tNew" ].value = readBuffer.texture;
renderer.setRenderTarget( this.textureComp );
this.compFsQuad.render( renderer );
this.copyFsQuad.material.map = this.textureComp.texture;
if ( this.renderToScreen ) {
renderer.setRenderTarget( null );
this.copyFsQuad.render( renderer );
} else {
renderer.setRenderTarget( writeBuffer );
if ( this.clear ) renderer.clear();
this.copyFsQuad.render( renderer );
}
// Swap buffers.
var temp = this.textureOld;
this.textureOld = this.textureComp;
this.textureComp = temp;
// Now textureOld contains the latest image, ready for the next frame.
},
setSize: function ( width, height ) {
this.textureComp.setSize( width, height );
this.textureOld.setSize( width, height );
}
} );
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