feat: initialize project with core dependencies and game entry point

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

@@ -0,0 +1,62 @@
+/**
+ * @module BrightnessContrastShader
+ * @three_import import { BrightnessContrastShader } from 'three/addons/shaders/BrightnessContrastShader.js';
+ */
+
+/**
+ * Brightness and contrast adjustment {@link https://github.com/evanw/glfx.js}.
+ * Brightness: -1 to 1 (-1 is solid black, 0 is no change, and 1 is solid white)
+ * Contrast: -1 to 1 (-1 is solid gray, 0 is no change, and 1 is maximum contrast)
+ *
+ * @constant
+ * @type {ShaderMaterial~Shader}
+ */
+const BrightnessContrastShader = {
+
+	name: 'BrightnessContrastShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'brightness': { value: 0 },
+		'contrast': { value: 0 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		uniform sampler2D tDiffuse;
+		uniform float brightness;
+		uniform float contrast;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			gl_FragColor = texture2D( tDiffuse, vUv );
+
+			gl_FragColor.rgb += brightness;
+
+			if (contrast > 0.0) {
+				gl_FragColor.rgb = (gl_FragColor.rgb - 0.5) / (1.0 - contrast) + 0.5;
+			} else {
+				gl_FragColor.rgb = (gl_FragColor.rgb - 0.5) * (1.0 + contrast) + 0.5;
+			}
+
+		}`
+
+};
+
+export { BrightnessContrastShader };