preact

frontend/node_modules/three/examples/jsm/nodes/utils/MaxMipLevelNode.js

@@ -0,0 +1,46 @@
+import UniformNode from '../core/UniformNode.js';
+import { NodeUpdateType } from '../core/constants.js';
+import { nodeProxy } from '../shadernode/ShaderNode.js';
+import { addNodeClass } from '../core/Node.js';
+
+class MaxMipLevelNode extends UniformNode {
+
+	constructor( textureNode ) {
+
+		super( 0 );
+
+		this.textureNode = textureNode;
+
+		this.updateType = NodeUpdateType.FRAME;
+
+	}
+
+	get texture() {
+
+		return this.textureNode.value;
+
+	}
+
+	update() {
+
+		const texture = this.texture;
+		const images = texture.images;
+		const image = ( images && images.length > 0 ) ? ( ( images[ 0 ] && images[ 0 ].image ) || images[ 0 ] ) : texture.image;
+
+		if ( image && image.width !== undefined ) {
+
+			const { width, height } = image;
+
+			this.value = Math.log2( Math.max( width, height ) );
+
+		}
+
+	}
+
+}
+
+export default MaxMipLevelNode;
+
+export const maxMipLevel = nodeProxy( MaxMipLevelNode );
+
+addNodeClass( 'MaxMipLevelNode', MaxMipLevelNode );