/**

* @author alteredq / http://alteredqualia.com/

*/

THREE.GlitchPass = function ( dt_size ) {

THREE.Pass.call( this );

if ( THREE.DigitalGlitch === undefined ) console.error( "THREE.GlitchPass relies on THREE.DigitalGlitch" );

var shader = THREE.DigitalGlitch;

this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );

if ( dt_size == undefined ) dt_size = 64;

this.uniforms[ "tDisp" ].value = this.generateHeightmap( dt_size );

this.material = new THREE.ShaderMaterial( {

uniforms: this.uniforms,

vertexShader: shader.vertexShader,

fragmentShader: shader.fragmentShader

} );

this.camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );

this.scene = new THREE.Scene();

this.quad = new THREE.Mesh( new THREE.PlaneBufferGeometry( 2, 2 ), null );

this.scene.add( this.quad );

this.goWild = false;

this.curF = 0;

this.generateTrigger();

};

THREE.GlitchPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {

constructor: THREE.GlitchPass,

render: function ( renderer, writeBuffer, readBuffer, delta, maskActive ) {

this.uniforms[ "tDiffuse" ].value = readBuffer.texture;

this.uniforms[ 'seed' ].value = Math.random();//default seeding

this.uniforms[ 'byp' ].value = 0;

if ( this.curF % this.randX == 0 || this.goWild == true ) {

this.uniforms[ 'amount' ].value = Math.random() / 30;

this.uniforms[ 'angle' ].value = THREE.Math.randFloat( - Math.PI, Math.PI );

this.uniforms[ 'seed_x' ].value = THREE.Math.randFloat( - 1, 1 );

this.uniforms[ 'seed_y' ].value = THREE.Math.randFloat( - 1, 1 );

this.uniforms[ 'distortion_x' ].value = THREE.Math.randFloat( 0, 1 );

this.uniforms[ 'distortion_y' ].value = THREE.Math.randFloat( 0, 1 );

this.curF = 0;

this.generateTrigger();

} else if ( this.curF % this.randX < this.randX / 5 ) {

this.uniforms[ 'amount' ].value = Math.random() / 90;

this.uniforms[ 'angle' ].value = THREE.Math.randFloat( - Math.PI, Math.PI );

this.uniforms[ 'distortion_x' ].value = THREE.Math.randFloat( 0, 1 );

this.uniforms[ 'distortion_y' ].value = THREE.Math.randFloat( 0, 1 );

this.uniforms[ 'seed_x' ].value = THREE.Math.randFloat( - 0.3, 0.3 );

this.uniforms[ 'seed_y' ].value = THREE.Math.randFloat( - 0.3, 0.3 );

} else if ( this.goWild == false ) {

this.uniforms[ 'byp' ].value = 1;

}

this.curF ++;

this.quad.material = this.material;

if ( this.renderToScreen ) {

renderer.render( this.scene, this.camera );

} else {

renderer.render( this.scene, this.camera, writeBuffer, this.clear );

}

},

generateTrigger: function() {

this.randX = THREE.Math.randInt( 120, 240 );

},

generateHeightmap: function( dt_size ) {

var data_arr = new Float32Array( dt_size * dt_size * 3 );

var length = dt_size * dt_size;

for ( var i = 0; i < length; i ++ ) {

var val = THREE.Math.randFloat( 0, 1 );

data_arr[ i * 3 + 0 ] = val;

data_arr[ i * 3 + 1 ] = val;

data_arr[ i * 3 + 2 ] = val;

}

var texture = new THREE.DataTexture( data_arr, dt_size, dt_size, THREE.RGBFormat, THREE.FloatType );

texture.needsUpdate = true;

return texture;

}

} );