mirror of
https://github.com/photonstorm/phaser
synced 2024-09-21 06:51:55 +00:00
112 lines
3.1 KiB
JavaScript
112 lines
3.1 KiB
JavaScript
/**
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* Original shader by @301z (http://glsl.heroku.com/e#11707.0)
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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.Fire = 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.shift = { type: '1f', value: 1.6 };
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this.uniforms.speed = { type: '2f', value: { x: 0.7, y: 0.4 } };
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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 vec2 speed;",
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"uniform float shift;",
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"float rand(vec2 n) {",
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"return fract(cos(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);",
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"}",
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"float noise(vec2 n) {",
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"const vec2 d = vec2(0.0, 1.0);",
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"vec2 b = floor(n), f = smoothstep(vec2(0.0), vec2(1.0), fract(n));",
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"return mix(mix(rand(b), rand(b + d.yx), f.x), mix(rand(b + d.xy), rand(b + d.yy), f.x), f.y);",
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"}",
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"float fbm(vec2 n) {",
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"float total = 0.0, amplitude = 1.0;",
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"for (int i = 0; i < 4; i++) {",
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"total += noise(n) * amplitude;",
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"n += n;",
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"amplitude *= 0.5;",
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"}",
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"return total;",
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"}",
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"void main() {",
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"const vec3 c1 = vec3(0.5, 0.0, 0.1);",
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"const vec3 c2 = vec3(0.9, 0.0, 0.0);",
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"const vec3 c3 = vec3(0.2, 0.0, 0.0);",
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"const vec3 c4 = vec3(1.0, 0.9, 0.0);",
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"const vec3 c5 = vec3(0.1);",
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"const vec3 c6 = vec3(0.9);",
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"vec2 p = gl_FragCoord.xy * 8.0 / resolution.xx;",
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"float q = fbm(p - time * 0.1);",
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"vec2 r = vec2(fbm(p + q + time * speed.x - p.x - p.y), fbm(p + q - time * speed.y));",
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"vec3 c = mix(c1, c2, fbm(p + r)) + mix(c3, c4, r.x) - mix(c5, c6, r.y);",
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"gl_FragColor = vec4(c * cos(shift * gl_FragCoord.y / resolution.y), alpha);",
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"}"
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];
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};
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Phaser.Filter.Fire.prototype = Object.create(Phaser.Filter.prototype);
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Phaser.Filter.Fire.prototype.constructor = Phaser.Filter.Fire;
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Phaser.Filter.Fire.prototype.init = function (width, height, alpha, shift) {
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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 shift !== 'undefined') {
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this.uniforms.shift.value = shift;
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}
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};
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Object.defineProperty(Phaser.Filter.Fire.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.Fire.prototype, 'shift', {
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get: function() {
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return this.uniforms.shift.value;
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},
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set: function(value) {
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this.uniforms.shift.value = value;
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}
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});
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Object.defineProperty(Phaser.Filter.Fire.prototype, 'speed', {
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get: function() {
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return this.uniforms.speed.value;
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},
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set: function(value) {
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this.uniforms.speed.value = value;
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}
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});
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