https://github.com/WWBN/AVideo/issues/8713

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

@@ -0,0 +1,56 @@
+/**
+ * Brightness and contrast adjustment
+ * 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)
+ */
+
+THREE.BrightnessContrastShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'brightness': { value: 0 },
+		'contrast': { value: 0 }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'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;',
+		'	}',
+
+		'}'
+
+	].join( '\n' )
+
+};