Tetris3D/js/libs/shaders/TechnicolorShader.js

/**
 * @author flimshaw / http://charliehoey.com
 *
 * Technicolor Shader
 * Simulates the look of the two-strip technicolor process popular in early 20th century films.
 * More historical info here: http://www.widescreenmuseum.com/oldcolor/technicolor1.htm
 * Demo here: http://charliehoey.com/technicolor_shader/shader_test.html
 */

THREE.TechnicolorShader = {

	uniforms: {

		"tDiffuse": { value: null }

	},

	vertexShader: [

		"varying vec2 vUv;",

		"void main() {",

			"vUv = uv;",
			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",

		"}"

	].join( "\n" ),

	fragmentShader: [

		"uniform sampler2D tDiffuse;",
		"varying vec2 vUv;",

		"void main() {",

			"vec4 tex = texture2D( tDiffuse, vec2( vUv.x, vUv.y ) );",
			"vec4 newTex = vec4(tex.r, (tex.g + tex.b) * .5, (tex.g + tex.b) * .5, 1.0);",

			"gl_FragColor = newTex;",

		"}"

	].join( "\n" )

};