Created
September 19, 2019 07:10
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rmmv OutlineFilter, using webgl
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var angleStep = (Math.PI * 2 / 10).toFixed(7); | |
var vert = `attribute vec2 aVertexPosition; | |
attribute vec2 aTextureCoord; | |
uniform mat3 projectionMatrix; | |
varying vec2 vTextureCoord; | |
void main(void) | |
{ | |
gl_Position = vec4((projectionMatrix * vec3(aVertexPosition, 1.0)).xy, 0.0, 1.0); | |
vTextureCoord = aTextureCoord; | |
}`; | |
var frag = `varying vec2 vTextureCoord; | |
uniform sampler2D uSampler; | |
uniform vec2 thickness; | |
uniform vec4 outlineColor; | |
uniform vec4 filterClamp; | |
const float DOUBLE_PI = 3.14159265358979323846264 * 2.; | |
void main(void) { | |
vec4 ownColor = texture2D(uSampler, vTextureCoord); | |
vec4 curColor; | |
float maxAlpha = 0.; | |
vec2 displaced; | |
for (float angle = 0.; angle <= DOUBLE_PI; angle += ${angleStep}) { | |
displaced.x = vTextureCoord.x + thickness.x * cos(angle); | |
displaced.y = vTextureCoord.y + thickness.y * sin(angle); | |
curColor = texture2D(uSampler, clamp(displaced, filterClamp.xy, filterClamp.zw)); | |
maxAlpha = max(maxAlpha, curColor.a); | |
} | |
float resultAlpha = max(maxAlpha, ownColor.a); | |
gl_FragColor = vec4((ownColor.rgb + outlineColor.rgb * (1. - ownColor.a)) * resultAlpha, resultAlpha); | |
}`; | |
class OutlineFilter extends PIXI.Filter { | |
constructor(thickness = 1, color = 0x000000) { | |
const samples = 10; | |
super(vert, frag); | |
this.uniforms.thickness = new Float32Array([0, 0]); | |
this.thickness = thickness; | |
this.uniforms.outlineColor = PIXI.utils.hex2rgb(color, new Float32Array([0, 0, 0, 1])); | |
} | |
apply(filterManager, input, output, clear) { | |
this.uniforms.thickness[0] = this.thickness / input.sourceFrame.width; | |
this.uniforms.thickness[1] = this.thickness / input.sourceFrame.height; | |
filterManager.applyFilter(this, input, output, clear); | |
} | |
} | |
b = new Bitmap(Graphics.width, Graphics.height) | |
b.fillAll('silver'); | |
back = scene.addChild(new Sprite(b)) | |
s = scene.addChild(new Sprite(Bitmap.load('icons8-beta-96.png'))) | |
s._filters = [new OutlineFilter(3, 0xFF0000)]; |
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