feat: initialize project with core dependencies and game entry point

node_modules/three/examples/jsm/shaders/UnpackDepthRGBAShader.js

@@ -0,0 +1,60 @@
+/**
+ * @module UnpackDepthRGBAShader
+ * @three_import import { UnpackDepthRGBAShader } from 'three/addons/shaders/UnpackDepthRGBAShader.js';
+ */
+
+/**
+ * Depth visualization shader that shows depth values as monochrome color.
+ *
+ * @constant
+ * @type {ShaderMaterial~Shader}
+ */
+const UnpackDepthRGBAShader = {
+
+	name: 'UnpackDepthRGBAShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'opacity': { value: 1.0 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		uniform float opacity;
+
+		uniform sampler2D tDiffuse;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			float depth = texture2D( tDiffuse, vUv ).r;
+
+			#ifdef USE_REVERSED_DEPTH_BUFFER
+
+				gl_FragColor = vec4( vec3( depth ), opacity );
+
+			#else
+
+				gl_FragColor = vec4( vec3( 1.0 - depth ), opacity );
+
+			#endif
+
+		}`
+
+};
+
+export { UnpackDepthRGBAShader };