class AnaglyphEffect {
/**
* Constructs a new anaglyph effect.
*
* @param {WebGLRenderer} renderer - The renderer.
* @param {number} width - The width of the effect in physical pixels.
* @param {number} height - The height of the effect in physical pixels.
*/
constructor( renderer, width = 512, height = 512 ) {
// Dubois matrices from https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.7.6968&rep=rep1&type=pdf#page=4
this.colorMatrixLeft = new Matrix3().fromArray( [
0.456100, - 0.0400822, - 0.0152161,
0.500484, - 0.0378246, - 0.0205971,
0.176381, - 0.0157589, - 0.00546856
] );
this.colorMatrixRight = new Matrix3().fromArray( [
- 0.0434706, 0.378476, - 0.0721527,
- 0.0879388, 0.73364, - 0.112961,
- 0.00155529, - 0.0184503, 1.2264
] );
const _stereo = new StereoCamera();
const _params = { minFilter: LinearFilter, magFilter: NearestFilter, format: RGBAFormat };
const _renderTargetL = new WebGLRenderTarget( width, height, _params );
const _renderTargetR = new WebGLRenderTarget( width, height, _params );
const _material = new 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;',
'void main() {',
' vec2 uv = vUv;',
' vec4 colorL = texture2D( mapLeft, uv );',
' vec4 colorR = texture2D( mapRight, uv );',
' vec3 color = clamp(',
' colorMatrixLeft * colorL.rgb +',
' colorMatrixRight * colorR.rgb, 0., 1. );',
' gl_FragColor = vec4(',
' color.r, color.g, color.b,',
' max( colorL.a, colorR.a ) );',
' #include <tonemapping_fragment>',
' #include <colorspace_fragment>',
'}'
].join( '\n' )
} );
const _quad = new FullScreenQuad( _material );
/**
* Resizes the effect.
*
* @param {number} width - The width of the effect in logical pixels.
* @param {number} height - The height of the effect in logical pixels.
*/
this.setSize = function ( width, height ) {
renderer.setSize( width, height );
const pixelRatio = renderer.getPixelRatio();
_renderTargetL.setSize( width * pixelRatio, height * pixelRatio );
_renderTargetR.setSize( width * pixelRatio, height * pixelRatio );
};
/**
* When using this effect, this method should be called instead of the
* default {@link WebGLRenderer#render}.
*
* @param {Object3D} scene - The scene to render.
* @param {Camera} camera - The camera.
*/
this.render = function ( scene, camera ) {
const currentRenderTarget = renderer.getRenderTarget();
if ( scene.matrixWorldAutoUpdate === true ) scene.updateMatrixWorld();
if ( camera.parent === null && camera.matrixWorldAutoUpdate === true ) 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 );
_quad.render( renderer );
renderer.setRenderTarget( currentRenderTarget );
};
/**
* Frees internal resources. This method should be called
* when the effect is no longer required.
*/
this.dispose = function () {
_renderTargetL.dispose();
_renderTargetR.dispose();
_material.dispose();
_quad.dispose();
};
}
}