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

node_modules/three/examples/js/shaders/BlendShader.js

@@ -0,0 +1,49 @@
+/**
+ * Blend two textures
+ */
+
+THREE.BlendShader = {
+
+	uniforms: {
+
+		'tDiffuse1': { value: null },
+		'tDiffuse2': { value: null },
+		'mixRatio': { value: 0.5 },
+		'opacity': { value: 1.0 }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'uniform float opacity;',
+		'uniform float mixRatio;',
+
+		'uniform sampler2D tDiffuse1;',
+		'uniform sampler2D tDiffuse2;',
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vec4 texel1 = texture2D( tDiffuse1, vUv );',
+		'	vec4 texel2 = texture2D( tDiffuse2, vUv );',
+		'	gl_FragColor = opacity * mix( texel1, texel2, mixRatio );',
+
+		'}'
+
+	].join( '\n' )
+
+};