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

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

@@ -0,0 +1,50 @@
+/**
+ * Luminosity
+ * http://en.wikipedia.org/wiki/Luminosity
+ */
+
+var LuminosityShader = {
+
+	uniforms: {
+
+		'tDiffuse': { value: null }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'#include <common>',
+
+		'uniform sampler2D tDiffuse;',
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vec4 texel = texture2D( tDiffuse, vUv );',
+
+		'	float l = linearToRelativeLuminance( texel.rgb );',
+
+		'	gl_FragColor = vec4( l, l, l, texel.w );',
+
+		'}'
+
+	].join( '\n' )
+
+};
+
+export { LuminosityShader };