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March 25, 2017 12:26
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Save tai2/8dfbd6baa0944965a67584ff7bdb98f0 to your computer and use it in GitHub Desktop.
c.f. http://benryves.com/tutorials/tunnel/ borrowed texture from http://webglplayground.net/documentation
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package { | |
import flash.display.Sprite; | |
import flash.display.Bitmap; | |
import flash.display.BitmapData; | |
import flash.display.Loader; | |
import flash.events.Event; | |
import flash.net.URLRequest; | |
import flash.utils.getTimer; | |
import flash.system.LoaderContext; | |
public class Tunnel extends Sprite { | |
private const TEXTURE_URL:String = "http://tai2.net/img/steel.jpg"; | |
private const TEXTURE_SIZE:int = 512; | |
private const V_DEPTH:Number = 250.0; | |
private const V_RAD:Number = 200.0; | |
private var canvas:BitmapData; | |
private var texture:BitmapData; | |
private var loader:Loader; | |
private var radtbl:Array; | |
private var radtbl_voffset:int; | |
private var radtbl_hoffset:int; | |
public function Tunnel() | |
{ | |
Wonderfl.capture_delay(10); | |
canvas = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0x000000); | |
addChild(new Bitmap(canvas)); | |
radtbl = makeRadTable(2 * canvas.width, 2 * canvas.height); | |
radtbl_hoffset = canvas.width; | |
radtbl_voffset = canvas.height; | |
var context:LoaderContext = new LoaderContext; | |
context.checkPolicyFile = true; | |
loader = new Loader(); | |
loader.load(new URLRequest(TEXTURE_URL), context); | |
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onImageLoaded); | |
} | |
private function makeRadTable(w:int, h:int) : Array | |
{ | |
var table:Array = new Array(h); | |
for (var y:int = 0; y < h; y++) { | |
table[y] = new Array(w); | |
for (var x:int = 0; x < w; x++) { | |
var tx:int = x - w / 2; | |
var ty:int = y - h / 2; | |
var rad:Number; | |
if (tx == 0) { | |
if (0 < ty) { | |
rad = Math.PI / 2; | |
} else { | |
rad = 3 * Math.PI / 4; | |
} | |
} else { | |
rad = Math.atan(Number(ty) / Number(tx)); | |
if (0 > tx) { | |
rad += Math.PI; | |
} | |
} | |
rad += Math.PI / 2; | |
rad *= 6; | |
table[y][x] = rad; | |
} | |
} | |
return table; | |
} | |
private function onImageLoaded(event:Event) : void | |
{ | |
texture = Bitmap(loader.content).bitmapData; | |
addEventListener(Event.ENTER_FRAME, enterFrame); | |
} | |
private function enterFrame(event:Event) : void | |
{ | |
var t:Number = getTimer() * 0.001; | |
var distance_max:Number = | |
(canvas.width - 1) * (canvas.width - 1) + (canvas.height - 1) * (canvas.height - 1); | |
var x_offset:int = canvas.width * 0.5 + ((canvas.width * 0.1) * Math.sin(0.6 * t)); | |
var y_offset:int = canvas.height * 0.5 + ((canvas.height * 0.25) * Math.cos(0.5 * t)); | |
var depth_offset:Number = V_DEPTH * t + V_DEPTH * Math.cos(0.5 * t); | |
canvas.lock(); | |
texture.lock(); | |
for (var y:int = 0; y < canvas.height; y++) { | |
for (var x:int = 0; x < canvas.width; x++) { | |
var tx:int = x - x_offset; | |
var ty:int = y - y_offset; | |
var distance:int = tx * tx + ty * ty; | |
var depth:int = distance == 0 ? 8388608 : 8388608 / distance; | |
var rad:Number = radtbl[ty + radtbl_voffset][tx + radtbl_hoffset]; | |
var u:int = (int(TEXTURE_SIZE * rad / (2 * Math.PI) + V_RAD * t)) % TEXTURE_SIZE; | |
var v:int = (int(depth + depth_offset)) % TEXTURE_SIZE; | |
var brightness:Number = Math.min(1.0, 0.05 + distance / distance_max); | |
var c:uint = texture.getPixel(u,v); | |
var r:uint = (c>>>16) & 0xFF; | |
var g:uint = (c>>> 8) & 0xFF; | |
var b:uint = (c>>> 0) & 0xFF; | |
r = uint(r * brightness); | |
g = uint(g * brightness); | |
b = uint(b * brightness); | |
canvas.setPixel(x, y, (r<<16) | (g<<8) | (b<<0)); | |
} | |
} | |
texture.unlock(); | |
canvas.unlock(); | |
} | |
} | |
} |
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