mirror of
https://github.com/photonstorm/phaser
synced 2024-11-24 05:33:35 +00:00
123 lines
3.2 KiB
JavaScript
123 lines
3.2 KiB
JavaScript
/**
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* Original shader by TriggerHLM (https://www.shadertoy.com/view/MdXGDH)
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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.Plasma = 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.redShift = { type: '1f', value: 0.5 };
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this.uniforms.greenShift = { type: '1f', value: 0.5 };
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this.uniforms.blueShift = { type: '1f', value: 0.9 };
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this.fragmentSrc = [
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"precision mediump float;",
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"uniform float time;",
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"uniform float alpha;",
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"uniform float size;",
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"uniform float redShift;",
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"uniform float greenShift;",
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"uniform float blueShift;",
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"const float PI = 3.14159265;",
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"float ptime = time * 0.1;",
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"void main(void) {",
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"float color1, color2, color;",
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"color1 = (sin(dot(gl_FragCoord.xy, vec2(sin(ptime * 3.0), cos(ptime * 3.0))) * 0.02 + ptime * 3.0) + 1.0) / 2.0;",
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"vec2 center = vec2(640.0 / 2.0, 360.0 / 2.0) + vec2(640.0 / 2.0 * sin(-ptime * 3.0), 360.0 / 2.0 * cos(-ptime * 3.0));",
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"color2 = (cos(length(gl_FragCoord.xy - center) * size) + 1.0) / 2.0;",
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"color = (color1 + color2) / 2.0;",
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"float red = (cos(PI * color / redShift + ptime * 3.0) + 1.0) / 2.0;",
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"float green = (sin(PI * color / greenShift + ptime * 3.0) + 1.0) / 2.0;",
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"float blue = (sin(PI * color / blueShift + ptime * 3.0) + 1.0) / 2.0;",
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"gl_FragColor = vec4(red, green, blue, alpha);",
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"}"
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];
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};
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Phaser.Filter.Plasma.prototype = Object.create(Phaser.Filter.prototype);
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Phaser.Filter.Plasma.prototype.constructor = Phaser.Filter.Plasma;
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Phaser.Filter.Plasma.prototype.init = function (width, height, alpha, size) {
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this.setResolution(width, height);
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if (typeof alpha !== 'undefined') {
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this.uniforms.alpha.value = alpha;
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}
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if (typeof size !== 'undefined') {
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this.uniforms.size.value = size;
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}
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}
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Object.defineProperty(Phaser.Filter.Plasma.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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Object.defineProperty(Phaser.Filter.Plasma.prototype, 'size', {
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get: function() {
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return this.uniforms.size.value;
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},
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set: function(value) {
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this.uniforms.size.value = value;
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}
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});
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Object.defineProperty(Phaser.Filter.Plasma.prototype, 'redShift', {
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get: function() {
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return this.uniforms.redShift.value;
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},
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set: function(value) {
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this.uniforms.redShift.value = value;
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}
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});
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Object.defineProperty(Phaser.Filter.Plasma.prototype, 'greenShift', {
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get: function() {
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return this.uniforms.greenShift.value;
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},
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set: function(value) {
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this.uniforms.greenShift.value = value;
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}
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});
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Object.defineProperty(Phaser.Filter.Plasma.prototype, 'blueShift', {
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get: function() {
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return this.uniforms.blueShift.value;
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},
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set: function(value) {
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this.uniforms.blueShift.value = value;
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}
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});
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