<script type="importmap">
  {
    "imports": {
      "three": "https://cdn.jsdelivr.net/npm/three@v0.170.0/build/three.webgpu.js",
      "three/tsl": "https://cdn.jsdelivr.net/npm/three@v0.170.0/build/three.webgpu.js",
      "three/addons/": "https://cdn.jsdelivr.net/npm/three@v0.170.0/examples/jsm/"
    }
  }
</script>

<div id="courses"><a href="https://niklever.com/courses" target="_blank">niklever.com/courses</a></div>

<style>
			#source {
				position: absolute;
				top: 0;
				left: 0;
				width: 50%;
				height: 100%;
			}
			#result {
				position: absolute;
				top: 0;
				right: 0;
				width: 50%;
				height: 100%;
			}
			#renderer {
				position: absolute;
				bottom: 15px;
				right: calc( 50% + 15px );
				width: 200px;
				height: 200px;
				z-index: 100;
				pointer-events: none;
			}
		</style>

		<div id="source"></div>
		<div id="result"></div>
		<div id="renderer"></div>

body{
  padding: 0;
  margin: 0;
}

#courses{
  font: bold 30px "Arial";
  position: fixed;
  left: 20px;
  top: 20px;
  color: #ffffff;
  text-decoration: none;
}

a:link {
  color: white;
  text-decoration: none;
}

a:hover{
  color: #dddd33;
  text-decoration: underline;
}

a:visited {
  color: white;
  text-decoration: none;
}

import * as THREE from 'three';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			init();

			function init() {

				// add the depedencies

				const width = 200;
				const height = 200;

				const camera = new THREE.PerspectiveCamera( 70, width / height, 0.1, 10 );
				camera.position.z = .72;
				camera.lookAt( 0, 0, 0 );

				const scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x222222 );

				const rendererDOM = document.getElementById( 'renderer' );

				const renderer = new THREE.WebGPURenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( 200, 200 );
				rendererDOM.appendChild( renderer.domElement );

				const material = new THREE.NodeMaterial();
				material.fragmentNode = THREE.vec4( 0, 0, 0, 1 );

				const mesh = new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ), material );
				scene.add( mesh );

				//

				let compiling = false;

				renderer.setAnimationLoop( () => {

					if ( compiling ) return;

					renderer.render( scene, camera );

				} );

				// editor

				window.require.config( { paths: { 'vs': 'https://cdn.jsdelivr.net/npm/monaco-editor@0.48.0/min/vs' } } );

				require( [ 'vs/editor/editor.main' ], () => {

					const options = {
						shader: 'fragment',
						outputColorSpace: THREE.SRGBColorSpace,
						output: 'WGSL',
						preview: true
					};

					let timeout = null;
					let rawShader = null;

					const editorDOM = document.getElementById( 'source' );
					const resultDOM = document.getElementById( 'result' );

					const tslCode = `// positionLocal or texture

const { positionLocal, texture, uv, vec4 } = THREE;

output = vec4( positionLocal, 1 );

//const tex = new THREE.TextureLoader().load( 'https://niksfiles.s3.eu-west-2.amazonaws.com/uv_grid.jpg' );
//output = vec4( texture( tex, uv() ).rgb, 1 );
`;

					const editor = window.monaco.editor.create( editorDOM, {
						value: tslCode,
						language: 'javascript',
						theme: 'vs-dark',
						automaticLayout: true,
						minimap: { enabled: false }
					} );

					const result = window.monaco.editor.create( resultDOM, {
						value: '',
						language: 'wgsl',
						theme: 'vs-dark',
						automaticLayout: true,
						readOnly: true,
						minimap: { enabled: false }
					} );

					const showCode = () => {

						result.setValue( rawShader[ options.shader + 'Shader' ] );
						result.revealLine( 1 );

					};

					const webGLRenderer = new THREE.WebGPURenderer( { forceWebGL: true } );

					const build = async () => {

						try {

							const tslCode = `let output = null;\n${ editor.getValue() }\nreturn { output };`;
							const nodes = new Function( 'THREE', tslCode )( THREE );

							mesh.material.fragmentNode = nodes.output;
							mesh.material.needsUpdate = true;

							compiling = true;

							if ( options.output === 'WGSL' ) {

								rawShader = await renderer.debug.getShaderAsync( scene, camera, mesh );


							} else if ( options.output === 'GLSL ES 3.0' ) {

								rawShader = await webGLRenderer.debug.getShaderAsync( scene, camera, mesh );

							}

							compiling = false;

							showCode();

							// extra debug info

							/*const style = 'background-color: #333; color: white; font-style: italic; border: 2px solid #777; font-size: 22px;';

							console.log( '%c  [ WGSL ] Vertex Shader      ', style );
							console.log( rawShader.vertexShader );
							console.log( '%c  [ WGSL ] Fragment Shader    ', style );
							console.log( rawShader.fragmentShader );/**/

						} catch ( e ) {

							result.setValue( 'Error: ' + e.message );

						}

					};

					build();

					editor.getModel().onDidChangeContent( () => {

						if ( timeout ) clearTimeout( timeout );

						timeout = setTimeout( build, 1000 );

					} );

					// gui

					const gui = new GUI();

					gui.add( options, 'output', [ 'WGSL', 'GLSL ES 3.0' ] ).onChange( build );
					gui.add( options, 'shader', [ 'vertex', 'fragment' ] ).onChange( showCode );

					gui.add( options, 'outputColorSpace', [ THREE.LinearSRGBColorSpace, THREE.SRGBColorSpace ] ).onChange( ( value ) => {

						renderer.outputColorSpace = value;

						build();

					} );

					gui.add( options, 'preview' ).onChange( ( value ) => {

						rendererDOM.style.display = value ? '' : 'none';

					} );

				} );

			}