three-stdlib/shaders/FocusShader.js

stand-alone library of threejs examples

const FocusShader = {
  uniforms: {
    tDiffuse: { value: null },
    screenWidth: { value: 1024 },
    screenHeight: { value: 1024 },
    sampleDistance: { value: 0.94 },
    waveFactor: { value: 125e-5 }
  },
  vertexShader: [
    "varying vec2 vUv;",
    "void main() {",
    "	vUv = uv;",
    "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
    "}"
  ].join("\n"),
  fragmentShader: [
    "uniform float screenWidth;",
    "uniform float screenHeight;",
    "uniform float sampleDistance;",
    "uniform float waveFactor;",
    "uniform sampler2D tDiffuse;",
    "varying vec2 vUv;",
    "void main() {",
    "	vec4 color, org, tmp, add;",
    "	float sample_dist, f;",
    "	vec2 vin;",
    "	vec2 uv = vUv;",
    "	add = color = org = texture2D( tDiffuse, uv );",
    "	vin = ( uv - vec2( 0.5 ) ) * vec2( 1.4 );",
    "	sample_dist = dot( vin, vin ) * 2.0;",
    "	f = ( waveFactor * 100.0 + sample_dist ) * sampleDistance * 4.0;",
    "	vec2 sampleSize = vec2(  1.0 / screenWidth, 1.0 / screenHeight ) * vec2( f );",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( 0.111964, 0.993712 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( 0.846724, 0.532032 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( 0.943883, -0.330279 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( 0.330279, -0.943883 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( -0.532032, -0.846724 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( -0.993712, -0.111964 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	add += tmp = texture2D( tDiffuse, uv + vec2( -0.707107, 0.707107 ) * sampleSize );",
    "	if( tmp.b < color.b ) color = tmp;",
    "	color = color * vec4( 2.0 ) - ( add / vec4( 8.0 ) );",
    "	color = color + ( add / vec4( 8.0 ) - color ) * ( vec4( 1.0 ) - vec4( sample_dist * 0.5 ) );",
    "	gl_FragColor = vec4( color.rgb * color.rgb * vec3( 0.95 ) + color.rgb, 1.0 );",
    "}"
  ].join("\n")
};
export {
  FocusShader
};
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