preact

frontend/node_modules/three/examples/jsm/renderers/common/RenderContexts.js

@@ -0,0 +1,63 @@
+import ChainMap from './ChainMap.js';
+import RenderContext from './RenderContext.js';
+
+class RenderContexts {
+
+	constructor() {
+
+		this.chainMaps = {};
+
+	}
+
+	get( scene, camera, renderTarget = null ) {
+
+		const chainKey = [ scene, camera ];
+
+		let attachmentState;
+
+		if ( renderTarget === null ) {
+
+			attachmentState = 'default';
+
+		} else {
+
+			const format = renderTarget.texture.format;
+			const count = renderTarget.count;
+
+			attachmentState = `${ count }:${ format }:${ renderTarget.samples }:${ renderTarget.depthBuffer }:${ renderTarget.stencilBuffer }`;
+
+		}
+
+		const chainMap = this.getChainMap( attachmentState );
+
+		let renderState = chainMap.get( chainKey );
+
+		if ( renderState === undefined ) {
+
+			renderState = new RenderContext();
+
+			chainMap.set( chainKey, renderState );
+
+		}
+
+		if ( renderTarget !== null ) renderState.sampleCount = renderTarget.samples === 0 ? 1 : renderTarget.samples;
+
+		return renderState;
+
+	}
+
+	getChainMap( attachmentState ) {
+
+		return this.chainMaps[ attachmentState ] || ( this.chainMaps[ attachmentState ] = new ChainMap() );
+
+	}
+
+	dispose() {
+
+		this.chainMaps = {};
+
+	}
+
+}
+
+export default RenderContexts;