mirror of
https://github.com/photonstorm/phaser
synced 2024-11-30 08:31:01 +00:00
79 lines
2.2 KiB
JavaScript
79 lines
2.2 KiB
JavaScript
/**
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* Original shader by Daniil (https://www.shadertoy.com/view/4sl3DH)
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* Tweaked, uniforms added and converted to Phaser/PIXI by Richard Davey
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*/
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Phaser.Filter.HueRotate = function (game) {
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Phaser.Filter.call(this, game);
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this.uniforms.alpha = { type: '1f', value: 1.0 };
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this.uniforms.size = { type: '1f', value: 0.03 };
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this.uniforms.iChannel0 = { type: 'sampler2D', value: null, textureData: { repeat: true } };
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this.fragmentSrc = [
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"precision mediump float;",
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"uniform vec2 resolution;",
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"uniform float time;",
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"uniform float alpha;",
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"uniform sampler2D iChannel0;",
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"/* Simple hue rotation filter based on article:",
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"http://beesbuzz.biz/code/hsv_color_transforms.php",
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"*/",
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"#define SPEED 10.0",
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"void main(void)",
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"{",
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"vec2 uv = gl_FragCoord.xy / resolution.xy;",
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"float c = cos(time * SPEED);",
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"float s = sin(time * SPEED);",
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"mat4 hueRotation =",
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"mat4( 0.299, 0.587, 0.114, 0.0,",
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"0.299, 0.587, 0.114, 0.0,",
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"0.299, 0.587, 0.114, 0.0,",
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"0.000, 0.000, 0.000, 1.0) +",
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"mat4( 0.701, -0.587, -0.114, 0.0,",
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"-0.299, 0.413, -0.114, 0.0,",
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"-0.300, -0.588, 0.886, 0.0,",
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"0.000, 0.000, 0.000, 0.0) * c +",
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"mat4( 0.168, 0.330, -0.497, 0.0,",
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"-0.328, 0.035, 0.292, 0.0,",
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"1.250, -1.050, -0.203, 0.0,",
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"0.000, 0.000, 0.000, 0.0) * s;",
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"vec4 pixel = texture2D(iChannel0, uv);",
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"gl_FragColor = pixel * hueRotation;",
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"}"
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];
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};
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Phaser.Filter.HueRotate.prototype = Object.create(Phaser.Filter.prototype);
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Phaser.Filter.HueRotate.prototype.constructor = Phaser.Filter.HueRotate;
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Phaser.Filter.HueRotate.prototype.init = function (width, height, texture) {
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this.setResolution(width, height);
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this.uniforms.iChannel0.value = texture;
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};
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Object.defineProperty(Phaser.Filter.HueRotate.prototype, 'alpha', {
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get: function() {
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return this.uniforms.alpha.value;
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},
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set: function(value) {
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this.uniforms.alpha.value = value;
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}
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});
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