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luxiaotao1123

2022-03-21 4f7e5d3dc070ea46f4ca243bcbae9eda76d8c8a0

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import { Pass } from '../../lib/postprocessing/Pass.js';
 
class MaskPass extends Pass {
 
    constructor( scene, camera ) {
 
        super();
 
        this.scene = scene;
        this.camera = camera;
 
        this.clear = true;
        this.needsSwap = false;
 
        this.inverse = false;
 
    }
 
    render( renderer, writeBuffer, readBuffer /*, deltaTime, maskActive */ ) {
 
        const context = renderer.getContext();
        const state = renderer.state;
 
        // don't update color or depth
 
        state.buffers.color.setMask( false );
        state.buffers.depth.setMask( false );
 
        // lock buffers
 
        state.buffers.color.setLocked( true );
        state.buffers.depth.setLocked( true );
 
        // set up stencil
 
        let writeValue, clearValue;
 
        if ( this.inverse ) {
 
            writeValue = 0;
            clearValue = 1;
 
        } else {
 
            writeValue = 1;
            clearValue = 0;
 
        }
 
        state.buffers.stencil.setTest( true );
        state.buffers.stencil.setOp( context.REPLACE, context.REPLACE, context.REPLACE );
        state.buffers.stencil.setFunc( context.ALWAYS, writeValue, 0xffffffff );
        state.buffers.stencil.setClear( clearValue );
        state.buffers.stencil.setLocked( true );
 
        // draw into the stencil buffer
 
        renderer.setRenderTarget( readBuffer );
        if ( this.clear ) renderer.clear();
        renderer.render( this.scene, this.camera );
 
        renderer.setRenderTarget( writeBuffer );
        if ( this.clear ) renderer.clear();
        renderer.render( this.scene, this.camera );
 
        // unlock color and depth buffer for subsequent rendering
 
        state.buffers.color.setLocked( false );
        state.buffers.depth.setLocked( false );
 
        // only render where stencil is set to 1
 
        state.buffers.stencil.setLocked( false );
        state.buffers.stencil.setFunc( context.EQUAL, 1, 0xffffffff ); // draw if == 1
        state.buffers.stencil.setOp( context.KEEP, context.KEEP, context.KEEP );
        state.buffers.stencil.setLocked( true );
 
    }
 
}
 
class ClearMaskPass extends Pass {
 
    constructor() {
 
        super();
 
        this.needsSwap = false;
 
    }
 
    render( renderer /*, writeBuffer, readBuffer, deltaTime, maskActive */ ) {
 
        renderer.state.buffers.stencil.setLocked( false );
        renderer.state.buffers.stencil.setTest( false );
 
    }
 
}
 
export { MaskPass, ClearMaskPass };