three-shaders/shaders/BlendShader.js

three-shaders - a library of shaders included with Three.js library

/**
 * @author alteredq / http://alteredqualia.com/
 *
 * Blend two textures
 */

function BlendShader() {

	return {

	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 );

		}

	`,

	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 );

		}

	`
	}
};

module.exports = BlendShader;