22

✏️ Editing: glitch-MaskPass.js

/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.MaskPass = function ( scene, camera ) {

this.scene = scene;
	this.camera = camera;

this.enabled = true;
	this.clear = true;
	this.needsSwap = false;

this.inverse = false;

};

THREE.MaskPass.prototype = {

render: function ( renderer, writeBuffer, readBuffer, delta ) {

var context = renderer.context;

// don't update color or depth

context.colorMask( false, false, false, false );
		context.depthMask( false );

// set up stencil

var writeValue, clearValue;

if ( this.inverse ) {

writeValue = 0;
			clearValue = 1;

} else {

writeValue = 1;
			clearValue = 0;

}

context.enable( context.STENCIL_TEST );
		context.stencilOp( context.REPLACE, context.REPLACE, context.REPLACE );
		context.stencilFunc( context.ALWAYS, writeValue, 0xffffffff );
		context.clearStencil( clearValue );

// draw into the stencil buffer

renderer.render( this.scene, this.camera, readBuffer, this.clear );
		renderer.render( this.scene, this.camera, writeBuffer, this.clear );

// re-enable update of color and depth

context.colorMask( true, true, true, true );
		context.depthMask( true );

// only render where stencil is set to 1

context.stencilFunc( context.EQUAL, 1, 0xffffffff );  // draw if == 1
		context.stencilOp( context.KEEP, context.KEEP, context.KEEP );

}

};

THREE.ClearMaskPass = function () {

this.enabled = true;

};

THREE.ClearMaskPass.prototype = {

render: function ( renderer, writeBuffer, readBuffer, delta ) {

var context = renderer.context;

context.disable( context.STENCIL_TEST );

}

};

MR SKB