https://github.com/WWBN/AVideo/issues/8713

node_modules/three/examples/js/effects/AnaglyphEffect.js

@@ -0,0 +1,158 @@
+THREE.AnaglyphEffect = function ( renderer, width, height ) {
+
+	// Matrices generated with angler.js https://github.com/tschw/angler.js/
+	// (in column-major element order, as accepted by WebGL)
+
+	this.colorMatrixLeft = new THREE.Matrix3().fromArray( [
+
+		1.0671679973602295, - 0.0016435992438346148, 0.0001777536963345483, // r out
+		- 0.028107794001698494, - 0.00019593400065787137, - 0.0002875397040043026, // g out
+		- 0.04279090091586113, 0.000015809757314855233, - 0.00024287120322696865 // b out
+
+	] );
+
+	//		red						green 						blue  						in
+
+	this.colorMatrixRight = new THREE.Matrix3().fromArray( [
+
+		- 0.0355340838432312, - 0.06440307199954987, 0.018319187685847282, // r out
+		- 0.10269022732973099, 0.8079727292060852, - 0.04835830628871918, // g out
+		0.0001224992738571018, - 0.009558862075209618, 0.567823588848114 // b out
+
+	] );
+
+	var _camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
+
+	var _scene = new THREE.Scene();
+
+	var _stereo = new THREE.StereoCamera();
+
+	var _params = { minFilter: THREE.LinearFilter, magFilter: THREE.NearestFilter, format: THREE.RGBAFormat };
+
+	if ( width === undefined ) width = 512;
+	if ( height === undefined ) height = 512;
+
+	var _renderTargetL = new THREE.WebGLRenderTarget( width, height, _params );
+	var _renderTargetR = new THREE.WebGLRenderTarget( width, height, _params );
+
+	var _material = new THREE.ShaderMaterial( {
+
+		uniforms: {
+
+			'mapLeft': { value: _renderTargetL.texture },
+			'mapRight': { value: _renderTargetR.texture },
+
+			'colorMatrixLeft': { value: this.colorMatrixLeft },
+			'colorMatrixRight': { value: this.colorMatrixRight }
+
+		},
+
+		vertexShader: [
+
+			'varying vec2 vUv;',
+
+			'void main() {',
+
+			'	vUv = vec2( uv.x, uv.y );',
+			'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+			'}'
+
+		].join( '\n' ),
+
+		fragmentShader: [
+
+			'uniform sampler2D mapLeft;',
+			'uniform sampler2D mapRight;',
+			'varying vec2 vUv;',
+
+			'uniform mat3 colorMatrixLeft;',
+			'uniform mat3 colorMatrixRight;',
+
+			// These functions implement sRGB linearization and gamma correction
+
+			'float lin( float c ) {',
+			'	return c <= 0.04045 ? c * 0.0773993808 :',
+			'			pow( c * 0.9478672986 + 0.0521327014, 2.4 );',
+			'}',
+
+			'vec4 lin( vec4 c ) {',
+			'	return vec4( lin( c.r ), lin( c.g ), lin( c.b ), c.a );',
+			'}',
+
+			'float dev( float c ) {',
+			'	return c <= 0.0031308 ? c * 12.92',
+			'			: pow( c, 0.41666 ) * 1.055 - 0.055;',
+			'}',
+
+
+			'void main() {',
+
+			'	vec2 uv = vUv;',
+
+			'	vec4 colorL = lin( texture2D( mapLeft, uv ) );',
+			'	vec4 colorR = lin( texture2D( mapRight, uv ) );',
+
+			'	vec3 color = clamp(',
+			'			colorMatrixLeft * colorL.rgb +',
+			'			colorMatrixRight * colorR.rgb, 0., 1. );',
+
+			'	gl_FragColor = vec4(',
+			'			dev( color.r ), dev( color.g ), dev( color.b ),',
+			'			max( colorL.a, colorR.a ) );',
+
+			'}'
+
+		].join( '\n' )
+
+	} );
+
+	var _mesh = new THREE.Mesh( new THREE.PlaneGeometry( 2, 2 ), _material );
+	_scene.add( _mesh );
+
+	this.setSize = function ( width, height ) {
+
+		renderer.setSize( width, height );
+
+		var pixelRatio = renderer.getPixelRatio();
+
+		_renderTargetL.setSize( width * pixelRatio, height * pixelRatio );
+		_renderTargetR.setSize( width * pixelRatio, height * pixelRatio );
+
+	};
+
+	this.render = function ( scene, camera ) {
+
+		var currentRenderTarget = renderer.getRenderTarget();
+
+		scene.updateMatrixWorld();
+
+		if ( camera.parent === null ) camera.updateMatrixWorld();
+
+		_stereo.update( camera );
+
+		renderer.setRenderTarget( _renderTargetL );
+		renderer.clear();
+		renderer.render( scene, _stereo.cameraL );
+
+		renderer.setRenderTarget( _renderTargetR );
+		renderer.clear();
+		renderer.render( scene, _stereo.cameraR );
+
+		renderer.setRenderTarget( null );
+		renderer.render( _scene, _camera );
+
+		renderer.setRenderTarget( currentRenderTarget );
+
+	};
+
+	this.dispose = function () {
+
+		if ( _renderTargetL ) _renderTargetL.dispose();
+		if ( _renderTargetR ) _renderTargetR.dispose();
+		if ( _mesh ) _mesh.geometry.dispose();
+		if ( _material ) _material.dispose();
+
+	};
+
+};