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

node_modules/three/examples/js/postprocessing/SSAARenderPass.js

@@ -0,0 +1,180 @@
+/**
+*
+* Supersample Anti-Aliasing Render Pass
+*
+* This manual approach to SSAA re-renders the scene ones for each sample with camera jitter and accumulates the results.
+*
+* References: https://en.wikipedia.org/wiki/Supersampling
+*
+*/
+
+THREE.SSAARenderPass = function ( scene, camera, clearColor, clearAlpha ) {
+
+	THREE.Pass.call( this );
+
+	this.scene = scene;
+	this.camera = camera;
+
+	this.sampleLevel = 4; // specified as n, where the number of samples is 2^n, so sampleLevel = 4, is 2^4 samples, 16.
+	this.unbiased = true;
+
+	// as we need to clear the buffer in this pass, clearColor must be set to something, defaults to black.
+	this.clearColor = ( clearColor !== undefined ) ? clearColor : 0x000000;
+	this.clearAlpha = ( clearAlpha !== undefined ) ? clearAlpha : 0;
+	this._oldClearColor = new THREE.Color();
+
+	if ( THREE.CopyShader === undefined ) console.error( 'THREE.SSAARenderPass relies on THREE.CopyShader' );
+
+	var copyShader = THREE.CopyShader;
+	this.copyUniforms = THREE.UniformsUtils.clone( copyShader.uniforms );
+
+	this.copyMaterial = new THREE.ShaderMaterial(	{
+		uniforms: this.copyUniforms,
+		vertexShader: copyShader.vertexShader,
+		fragmentShader: copyShader.fragmentShader,
+		premultipliedAlpha: true,
+		transparent: true,
+		blending: THREE.AdditiveBlending,
+		depthTest: false,
+		depthWrite: false
+	} );
+
+	this.fsQuad = new THREE.Pass.FullScreenQuad( this.copyMaterial );
+
+};
+
+THREE.SSAARenderPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {
+
+	constructor: THREE.SSAARenderPass,
+
+	dispose: function () {
+
+		if ( this.sampleRenderTarget ) {
+
+			this.sampleRenderTarget.dispose();
+			this.sampleRenderTarget = null;
+
+		}
+
+	},
+
+	setSize: function ( width, height ) {
+
+		if ( this.sampleRenderTarget )	this.sampleRenderTarget.setSize( width, height );
+
+	},
+
+	render: function ( renderer, writeBuffer, readBuffer ) {
+
+		if ( ! this.sampleRenderTarget ) {
+
+			this.sampleRenderTarget = new THREE.WebGLRenderTarget( readBuffer.width, readBuffer.height, { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBAFormat } );
+			this.sampleRenderTarget.texture.name = 'SSAARenderPass.sample';
+
+		}
+
+		var jitterOffsets = THREE.SSAARenderPass.JitterVectors[ Math.max( 0, Math.min( this.sampleLevel, 5 ) ) ];
+
+		var autoClear = renderer.autoClear;
+		renderer.autoClear = false;
+
+		renderer.getClearColor( this._oldClearColor );
+		var oldClearAlpha = renderer.getClearAlpha();
+
+		var baseSampleWeight = 1.0 / jitterOffsets.length;
+		var roundingRange = 1 / 32;
+		this.copyUniforms[ 'tDiffuse' ].value = this.sampleRenderTarget.texture;
+
+		var width = readBuffer.width, height = readBuffer.height;
+
+		// render the scene multiple times, each slightly jitter offset from the last and accumulate the results.
+		for ( var i = 0; i < jitterOffsets.length; i ++ ) {
+
+			var jitterOffset = jitterOffsets[ i ];
+
+			if ( this.camera.setViewOffset ) {
+
+				this.camera.setViewOffset( width, height,
+					jitterOffset[ 0 ] * 0.0625, jitterOffset[ 1 ] * 0.0625, // 0.0625 = 1 / 16
+					width, height );
+
+			}
+
+			var sampleWeight = baseSampleWeight;
+
+			if ( this.unbiased ) {
+
+				// the theory is that equal weights for each sample lead to an accumulation of rounding errors.
+				// The following equation varies the sampleWeight per sample so that it is uniformly distributed
+				// across a range of values whose rounding errors cancel each other out.
+
+				var uniformCenteredDistribution = ( - 0.5 + ( i + 0.5 ) / jitterOffsets.length );
+				sampleWeight += roundingRange * uniformCenteredDistribution;
+
+			}
+
+			this.copyUniforms[ 'opacity' ].value = sampleWeight;
+			renderer.setClearColor( this.clearColor, this.clearAlpha );
+			renderer.setRenderTarget( this.sampleRenderTarget );
+			renderer.clear();
+			renderer.render( this.scene, this.camera );
+
+			renderer.setRenderTarget( this.renderToScreen ? null : writeBuffer );
+
+			if ( i === 0 ) {
+
+				renderer.setClearColor( 0x000000, 0.0 );
+				renderer.clear();
+
+			}
+
+			this.fsQuad.render( renderer );
+
+		}
+
+		if ( this.camera.clearViewOffset ) this.camera.clearViewOffset();
+
+		renderer.autoClear = autoClear;
+		renderer.setClearColor( this._oldClearColor, oldClearAlpha );
+
+	}
+
+} );
+
+
+// These jitter vectors are specified in integers because it is easier.
+// I am assuming a [-8,8) integer grid, but it needs to be mapped onto [-0.5,0.5)
+// before being used, thus these integers need to be scaled by 1/16.
+//
+// Sample patterns reference: https://msdn.microsoft.com/en-us/library/windows/desktop/ff476218%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
+THREE.SSAARenderPass.JitterVectors = [
+	[
+		[ 0, 0 ]
+	],
+	[
+		[ 4, 4 ], [ - 4, - 4 ]
+	],
+	[
+		[ - 2, - 6 ], [ 6, - 2 ], [ - 6, 2 ], [ 2, 6 ]
+	],
+	[
+		[ 1, - 3 ], [ - 1, 3 ], [ 5, 1 ], [ - 3, - 5 ],
+		[ - 5, 5 ], [ - 7, - 1 ], [ 3, 7 ], [ 7, - 7 ]
+	],
+	[
+		[ 1, 1 ], [ - 1, - 3 ], [ - 3, 2 ], [ 4, - 1 ],
+		[ - 5, - 2 ], [ 2, 5 ], [ 5, 3 ], [ 3, - 5 ],
+		[ - 2, 6 ], [ 0, - 7 ], [ - 4, - 6 ], [ - 6, 4 ],
+		[ - 8, 0 ], [ 7, - 4 ], [ 6, 7 ], [ - 7, - 8 ]
+	],
+	[
+		[ - 4, - 7 ], [ - 7, - 5 ], [ - 3, - 5 ], [ - 5, - 4 ],
+		[ - 1, - 4 ], [ - 2, - 2 ], [ - 6, - 1 ], [ - 4, 0 ],
+		[ - 7, 1 ], [ - 1, 2 ], [ - 6, 3 ], [ - 3, 3 ],
+		[ - 7, 6 ], [ - 3, 6 ], [ - 5, 7 ], [ - 1, 7 ],
+		[ 5, - 7 ], [ 1, - 6 ], [ 6, - 5 ], [ 4, - 4 ],
+		[ 2, - 3 ], [ 7, - 2 ], [ 1, - 1 ], [ 4, - 1 ],
+		[ 2, 1 ], [ 6, 2 ], [ 0, 4 ], [ 4, 4 ],
+		[ 2, 5 ], [ 7, 5 ], [ 5, 6 ], [ 3, 7 ]
+	]
+];