three 基础库
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import {
BufferGeometry,
Clock,
Float32BufferAttribute,
LinearFilter,
Mesh,
OrthographicCamera,
RGBAFormat,
Vector2,
WebGLRenderTarget
} from '../../../build/three.module.js';
import { CopyShader } from '../shaders/CopyShader.js';
import { ShaderPass } from '../postprocessing/ShaderPass.js';
import { MaskPass } from '../postprocessing/MaskPass.js';
import { ClearMaskPass } from '../postprocessing/MaskPass.js';
class EffectComposer {
constructor( renderer, renderTarget ) {
this.renderer = renderer;
if ( renderTarget === undefined ) {
const parameters = {
minFilter: LinearFilter,
magFilter: LinearFilter,
format: RGBAFormat
};
const size = renderer.getSize( new Vector2() );
this._pixelRatio = renderer.getPixelRatio();
this._width = size.width;
this._height = size.height;
renderTarget = new WebGLRenderTarget( this._width * this._pixelRatio, this._height * this._pixelRatio, parameters );
renderTarget.texture.name = 'EffectComposer.rt1';
} else {
this._pixelRatio = 1;
this._width = renderTarget.width;
this._height = renderTarget.height;
}
this.renderTarget1 = renderTarget;
this.renderTarget2 = renderTarget.clone();
this.renderTarget2.texture.name = 'EffectComposer.rt2';
this.writeBuffer = this.renderTarget1;
this.readBuffer = this.renderTarget2;
this.renderToScreen = true;
this.passes = [];
// dependencies
if ( CopyShader === undefined ) {
console.error( 'THREE.EffectComposer relies on CopyShader' );
}
if ( ShaderPass === undefined ) {
console.error( 'THREE.EffectComposer relies on ShaderPass' );
}
this.copyPass = new ShaderPass( CopyShader );
this.clock = new Clock();
}
swapBuffers() {
const tmp = this.readBuffer;
this.readBuffer = this.writeBuffer;
this.writeBuffer = tmp;
}
addPass( pass ) {
this.passes.push( pass );
pass.setSize( this._width * this._pixelRatio, this._height * this._pixelRatio );
}
insertPass( pass, index ) {
this.passes.splice( index, 0, pass );
pass.setSize( this._width * this._pixelRatio, this._height * this._pixelRatio );
}
removePass( pass ) {
const index = this.passes.indexOf( pass );
if ( index !== - 1 ) {
this.passes.splice( index, 1 );
}
}
isLastEnabledPass( passIndex ) {
for ( let i = passIndex + 1; i < this.passes.length; i ++ ) {
if ( this.passes[ i ].enabled ) {
return false;
}
}
return true;
}
render( deltaTime ) {
// deltaTime value is in seconds
if ( deltaTime === undefined ) {
deltaTime = this.clock.getDelta();
}
const currentRenderTarget = this.renderer.getRenderTarget();
let maskActive = false;
for ( let i = 0, il = this.passes.length; i < il; i ++ ) {
const pass = this.passes[ i ];
if ( pass.enabled === false ) continue;
pass.renderToScreen = ( this.renderToScreen && this.isLastEnabledPass( i ) );
pass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime, maskActive );
if ( pass.needsSwap ) {
if ( maskActive ) {
const context = this.renderer.getContext();
const stencil = this.renderer.state.buffers.stencil;
//context.stencilFunc( context.NOTEQUAL, 1, 0xffffffff );
stencil.setFunc( context.NOTEQUAL, 1, 0xffffffff );
this.copyPass.render( this.renderer, this.writeBuffer, this.readBuffer, deltaTime );
//context.stencilFunc( context.EQUAL, 1, 0xffffffff );
stencil.setFunc( context.EQUAL, 1, 0xffffffff );
}
this.swapBuffers();
}
if ( MaskPass !== undefined ) {
if ( pass instanceof MaskPass ) {
maskActive = true;
} else if ( pass instanceof ClearMaskPass ) {
maskActive = false;
}
}
}
this.renderer.setRenderTarget( currentRenderTarget );
}
reset( renderTarget ) {
if ( renderTarget === undefined ) {
const size = this.renderer.getSize( new Vector2() );
this._pixelRatio = this.renderer.getPixelRatio();
this._width = size.width;
this._height = size.height;
renderTarget = this.renderTarget1.clone();
renderTarget.setSize( this._width * this._pixelRatio, this._height * this._pixelRatio );
}
this.renderTarget1.dispose();
this.renderTarget2.dispose();
this.renderTarget1 = renderTarget;
this.renderTarget2 = renderTarget.clone();
this.writeBuffer = this.renderTarget1;
this.readBuffer = this.renderTarget2;
}
setSize( width, height ) {
this._width = width;
this._height = height;
const effectiveWidth = this._width * this._pixelRatio;
const effectiveHeight = this._height * this._pixelRatio;
this.renderTarget1.setSize( effectiveWidth, effectiveHeight );
this.renderTarget2.setSize( effectiveWidth, effectiveHeight );
for ( let i = 0; i < this.passes.length; i ++ ) {
this.passes[ i ].setSize( effectiveWidth, effectiveHeight );
}
}
setPixelRatio( pixelRatio ) {
this._pixelRatio = pixelRatio;
this.setSize( this._width, this._height );
}
}
class Pass {
constructor() {
// if set to true, the pass is processed by the composer
this.enabled = true;
// if set to true, the pass indicates to swap read and write buffer after rendering
this.needsSwap = true;
// if set to true, the pass clears its buffer before rendering
this.clear = false;
// if set to true, the result of the pass is rendered to screen. This is set automatically by EffectComposer.
this.renderToScreen = false;
}
setSize( /* width, height */ ) {}
render( /* renderer, writeBuffer, readBuffer, deltaTime, maskActive */ ) {
console.error( 'THREE.Pass: .render() must be implemented in derived pass.' );
}
}
// Helper for passes that need to fill the viewport with a single quad.
const _camera = new OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
// https://github.com/mrdoob/three.js/pull/21358
const _geometry = new BufferGeometry();
_geometry.setAttribute( 'position', new Float32BufferAttribute( [ - 1, 3, 0, - 1, - 1, 0, 3, - 1, 0 ], 3 ) );
_geometry.setAttribute( 'uv', new Float32BufferAttribute( [ 0, 2, 0, 0, 2, 0 ], 2 ) );
class FullScreenQuad {
constructor( material ) {
this._mesh = new Mesh( _geometry, material );
}
dispose() {
this._mesh.geometry.dispose();
}
render( renderer ) {
renderer.render( this._mesh, _camera );
}
get material() {
return this._mesh.material;
}
set material( value ) {
this._mesh.material = value;
}
}
export { EffectComposer, Pass, FullScreenQuad };