/usr/share/javascript/three/examples/js/postprocessing/TAARenderPass.js is in libjs-three 80+dfsg2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Temporal Anti-Aliasing Render Pass
*
* @author bhouston / http://clara.io/
*
* When there is no motion in the scene, the TAA render pass accumulates jittered camera samples across frames to create a high quality anti-aliased result.
*
* References:
*
* TODO: Add support for motion vector pas so that accumulation of samples across frames can occur on dynamics scenes.
*
*/
THREE.TAARenderPass = function ( scene, camera, params ) {
if ( THREE.ManualMSAARenderPass === undefined ) {
console.error( "THREE.TAARenderPass relies on THREE.ManualMSAARenderPass" );
}
THREE.ManualMSAARenderPass.call( this, scene, camera, params );
this.sampleLevel = 0;
this.accumulate = false;
};
THREE.TAARenderPass.JitterVectors = THREE.ManualMSAARenderPass.JitterVectors;
THREE.TAARenderPass.prototype = Object.assign( Object.create( THREE.ManualMSAARenderPass.prototype ), {
constructor: THREE.TAARenderPass,
render: function ( renderer, writeBuffer, readBuffer, delta ) {
if( ! this.accumulate ) {
THREE.ManualMSAARenderPass.prototype.render.call( this, renderer, writeBuffer, readBuffer, delta );
this.accumulateIndex = -1;
return;
}
var jitterOffsets = THREE.TAARenderPass.JitterVectors[ 5 ];
if ( ! this.sampleRenderTarget ) {
this.sampleRenderTarget = new THREE.WebGLRenderTarget( readBuffer.width, readBuffer.height, this.params );
}
if ( ! this.holdRenderTarget ) {
this.holdRenderTarget = new THREE.WebGLRenderTarget( readBuffer.width, readBuffer.height, this.params );
}
if( this.accumulate && this.accumulateIndex === -1 ) {
THREE.ManualMSAARenderPass.prototype.render.call( this, renderer, this.holdRenderTarget, readBuffer, delta );
this.accumulateIndex = 0;
}
var autoClear = renderer.autoClear;
renderer.autoClear = false;
var sampleWeight = 1.0 / ( jitterOffsets.length );
if( this.accumulateIndex >= 0 && this.accumulateIndex < jitterOffsets.length ) {
this.copyUniforms[ "opacity" ].value = sampleWeight;
this.copyUniforms[ "tDiffuse" ].value = writeBuffer.texture;
// render the scene multiple times, each slightly jitter offset from the last and accumulate the results.
var numSamplesPerFrame = Math.pow( 2, this.sampleLevel );
for ( var i = 0; i < numSamplesPerFrame; i ++ ) {
var j = this.accumulateIndex;
var jitterOffset = jitterOffsets[j];
if ( this.camera.setViewOffset ) {
this.camera.setViewOffset( readBuffer.width, readBuffer.height,
jitterOffset[ 0 ] * 0.0625, jitterOffset[ 1 ] * 0.0625, // 0.0625 = 1 / 16
readBuffer.width, readBuffer.height );
}
renderer.render( this.scene, this.camera, writeBuffer, true );
renderer.render( this.scene2, this.camera2, this.sampleRenderTarget, ( this.accumulateIndex === 0 ) );
this.accumulateIndex ++;
if( this.accumulateIndex >= jitterOffsets.length ) break;
}
if ( this.camera.clearViewOffset ) this.camera.clearViewOffset();
}
var accumulationWeight = this.accumulateIndex * sampleWeight;
if( accumulationWeight > 0 ) {
this.copyUniforms[ "opacity" ].value = 1.0;
this.copyUniforms[ "tDiffuse" ].value = this.sampleRenderTarget.texture;
renderer.render( this.scene2, this.camera2, writeBuffer, true );
}
if( accumulationWeight < 1.0 ) {
this.copyUniforms[ "opacity" ].value = 1.0 - accumulationWeight;
this.copyUniforms[ "tDiffuse" ].value = this.holdRenderTarget.texture;
renderer.render( this.scene2, this.camera2, writeBuffer, ( accumulationWeight === 0 ) );
}
renderer.autoClear = autoClear;
}
});
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