three 基础库
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( function () {
class TexturePass extends THREE.Pass {
constructor( map, opacity ) {
super();
if ( THREE.CopyShader === undefined ) console.error( 'THREE.TexturePass relies on THREE.CopyShader' );
const shader = THREE.CopyShader;
this.map = map;
this.opacity = opacity !== undefined ? opacity : 1.0;
this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );
this.material = new THREE.ShaderMaterial( {
uniforms: this.uniforms,
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
depthTest: false,
depthWrite: false
} );
this.needsSwap = false;
this.fsQuad = new THREE.FullScreenQuad( null );
}
render( renderer, writeBuffer, readBuffer
/*, deltaTime, maskActive */
) {
const oldAutoClear = renderer.autoClear;
renderer.autoClear = false;
this.fsQuad.material = this.material;
this.uniforms[ 'opacity' ].value = this.opacity;
this.uniforms[ 'tDiffuse' ].value = this.map;
this.material.transparent = this.opacity < 1.0;
renderer.setRenderTarget( this.renderToScreen ? null : readBuffer );
if ( this.clear ) renderer.clear();
this.fsQuad.render( renderer );
renderer.autoClear = oldAutoClear;
}
}
THREE.TexturePass = TexturePass;
} )();