some broken water code that needs fixing at some point

assets/shaders/water.fs

@@ -0,0 +1,28 @@
+precision mediump float;
+
+varying vec4 clipSpace;
+
+uniform sampler2D reflectionTexture;
+uniform sampler2D refractionTexture;
+uniform sampler2D dudvMap;
+
+varying vec2 uv;
+const float waveStrength = 0.002;
+
+void main() {
+  vec2 ndc = (clipSpace.xy / clipSpace.w) / 2.0 + 0.5;
+  vec2 refractTexCoords = vec2(ndc.x, ndc.y);
+  vec2 reflectTexCoords = vec2(ndc.x, 1.0 - ndc.y);
+
+  vec2 distortion1 = texture2D(dudvMap, uv).xy * 2.0 - 1.0 * waveStrength;
+  refractTexCoords += distortion1;
+  refractTexCoords = clamp(refractTexCoords, 0.001, 0.999);
+  reflectTexCoords += distortion1;
+  reflectTexCoords.x = clamp(reflectTexCoords.x, 0.001, 0.999);
+  reflectTexCoords.y = clamp(reflectTexCoords.y, -0.999, -0.001);
+
+  vec4 reflectColor = texture2D(reflectionTexture, reflectTexCoords);
+  vec4 refractColor = texture2D(refractionTexture, refractTexCoords);
+
+  gl_FragColor = mix(reflectColor, refractColor, 0.5);
+}

assets/shaders/water.vs

@@ -0,0 +1,18 @@
+precision mediump float;
+
+attribute vec2 aVertexPosition;
+
+uniform mat4 uModelMatrix;
+uniform mat4 uViewMatrix;
+uniform mat4 uProjectionMatrix;
+
+varying vec4 clipSpace;
+varying vec2 uv;
+
+const float tiling = 6.0;
+
+void main() {
+  clipSpace = uProjectionMatrix * uViewMatrix * uModelMatrix * vec4(aVertexPosition.x, 0.0, aVertexPosition.y, 1.0);
+  gl_Position = clipSpace;
+  uv = vec2(aVertexPosition.x/2.0+0.5,aVertexPosition.y/2.0+0.5) * tiling;
+}

src/engine/camera.js

@@ -1,3 +1,4 @@
+import Screen from './screen'
 import { Node } from './components'
 import { glMatrix, mat4, vec2, vec3 } from 'gl-matrix'
 
@@ -101,8 +102,7 @@ class Camera extends Node {
   }
 
   updateProjection (gl) {
-    let aspect = gl.canvas.width / gl.canvas.height
+    mat4.perspective(this.projection, this.fov, Screen.aspectRatio, this.nearPlane, this.farPlane)
-    mat4.perspective(this.projection, this.fov, aspect, this.nearPlane, this.farPlane)
   }
 
   // Calculate the view matrix on-the-go

src/engine/components/water/index.js

@@ -0,0 +1,153 @@
+import { Node } from '../'
+import { Mesh } from '../../mesh'
+import { Texture } from '../../mesh/material'
+import Screen from '../../screen'
+import Resource from '../../resource'
+
+class WaterFBOs {
+  constructor (reflectionWidth = 320, reflectionHeight = 180, refractionWidth = 1280, refractionHeight = 720) {
+    this.reflectionHeight = reflectionHeight
+    this.reflectionWidth = reflectionWidth
+    this.refractionHeight = refractionHeight
+    this.refractionWidth = refractionWidth
+  }
+
+  initialize (gl) {
+    this.initReflectionFrameBuffer(gl)
+    this.initRefractionFrameBuffer(gl)
+  }
+
+  initReflectionFrameBuffer (gl) {
+    this.reflectionFrameBuffer = this.createFrameBuffer(gl)
+    this.reflectionTexture = this.createTextureAttachment(gl, this.reflectionWidth, this.reflectionHeight)
+    this.reflectionDepthBuffer = this.createDepthBufferAttachment(gl, this.reflectionWidth, this.reflectionHeight)
+    this.unbindFrameBuffer(gl)
+  }
+
+  initRefractionFrameBuffer (gl) {
+    this.refractionFrameBuffer = this.createFrameBuffer(gl)
+    this.refractionTexture = this.createTextureAttachment(gl, this.refractionWidth, this.refractionHeight)
+    this.refractionDepthTexture = this.createDepthTextureAttachment(gl, this.refractionWidth, this.refractionHeight)
+    this.unbindFrameBuffer(gl)
+  }
+
+  createFrameBuffer (gl) {
+    // generate frame buffer
+    let frameBuffer = gl.createFramebuffer()
+    // create the framebuffer
+    gl.bindFramebuffer(gl.FRAMEBUFFER, frameBuffer)
+    // indicate that we will always render to color attachment 0
+    gl.drawBuffers.drawBuffersWEBGL([gl.COLOR_ATTACHMENT0])
+    return frameBuffer
+  }
+
+  unbindFrameBuffer (gl) {
+    gl.bindFramebuffer(gl.FRAMEBUFFER, null)
+    gl.viewport(0, 0, Screen.width, Screen.height)
+  }
+
+  bindFrameBuffer (gl, frameBuffer, width, height) {
+    gl.bindTexture(gl.TEXTURE_2D, null) // To make sure the texture isn't bound
+    gl.bindFramebuffer(gl.FRAMEBUFFER, frameBuffer)
+    gl.viewport(0, 0, width, height)
+  }
+
+  // call before rendering to this FBO
+  bindReflectionFrameBuffer (gl) {
+    this.bindFrameBuffer(gl, this.reflectionFrameBuffer, this.reflectionWidth, this.reflectionHeight)
+  }
+
+  // call before rendering to this FBO
+  bindRefractionFrameBuffer (gl) {
+    this.bindFrameBuffer(gl, this.refractionFrameBuffer, this.refractionWidth, this.refractionHeight)
+  }
+
+  createTextureAttachment (gl, width, height) {
+    let texture = gl.createTexture()
+    gl.bindTexture(gl.TEXTURE_2D, texture)
+    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, width, height, 0, gl.RGB, gl.UNSIGNED_BYTE, null)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
+    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0)
+    return texture
+  }
+
+  createDepthTextureAttachment (gl, width, height) {
+    let texture = gl.createTexture()
+    gl.bindTexture(gl.TEXTURE_2D, texture)
+    gl.texImage2D(gl.TEXTURE_2D, 0, gl.DEPTH_COMPONENT, width, height, 0, gl.DEPTH_COMPONENT, gl.UNSIGNED_SHORT, null)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
+    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, texture, 0)
+    return texture
+  }
+
+  createDepthBufferAttachment (gl, width, height) {
+    let depthBuffer = gl.createRenderbuffer()
+    gl.bindRenderbuffer(gl.RENDERBUFFER, depthBuffer)
+    gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, width, height)
+    gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, depthBuffer)
+    return depthBuffer
+  }
+}
+
+class WaterTile extends Node {
+  constructor (pos, scale, rot) {
+    super(pos, [scale, 0.0, scale], rot)
+    this.fbos = new WaterFBOs()
+  }
+
+  initialize (gl) {
+    this.mesh = Mesh.constructFromVertices(gl, [-1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1], 2)
+    this.fbos.initialize(gl)
+  }
+
+  async useDUDV (gl, file) {
+    this.dudv = await Texture.createTexture2D(gl, await Resource.loadImage(file + '.png'), false, gl.LINEAR)
+  }
+
+  reflect (gl, cam, render) {
+    this.fbos.bindReflectionFrameBuffer(gl)
+    let dist = 2 * (cam.pos[1] - this.pos[1])
+    cam.pos[1] -= dist
+    cam.rotation[1] *= -1
+    cam.updateTransform()
+    render(gl)
+    this.fbos.unbindFrameBuffer(gl)
+    cam.pos[1] += dist
+    cam.rotation[1] *= -1
+    cam.updateTransform()
+  }
+
+  refract (gl, cam, render) {
+    this.fbos.bindRefractionFrameBuffer(gl)
+    render(gl)
+    this.fbos.unbindFrameBuffer(gl)
+  }
+
+  draw (gl, shader) {
+    super.draw(gl, shader)
+
+    const transformLocation = shader.getUniformLocation(gl, 'uModelMatrix')
+    gl.uniformMatrix4fv(transformLocation, false, this.transform)
+
+    gl.activeTexture(gl.TEXTURE0)
+    gl.bindTexture(gl.TEXTURE_2D, this.fbos.reflectionTexture)
+    gl.activeTexture(gl.TEXTURE1)
+    gl.bindTexture(gl.TEXTURE_2D, this.fbos.refractionTexture)
+    if (this.dudv) {
+      gl.activeTexture(gl.TEXTURE2)
+      gl.bindTexture(gl.TEXTURE_2D, this.dudv.id)
+    }
+
+    this.mesh.prepare(gl, shader)
+    this.mesh.draw(gl, shader)
+    this.mesh.postdraw(gl, shader)
+  }
+}
+
+export { WaterTile, WaterFBOs }

src/engine/gui/font.js

@@ -6,7 +6,6 @@ import { Node2D } from './'
 
 import { mat4 } from 'gl-matrix'
 
-const aspectRatio = Screen.width / Screen.height
 const PAD_TOP = 0
 const PAD_LEFT = 1
 const PAD_BOTTOM = 2
@@ -46,6 +45,7 @@ class Word {
   }
 
   addCharacter (char) {
+    if (!char) return
     this.characters.push(char)
     this.width += char.xAdvance * this.fontSize
   }
@@ -74,7 +74,6 @@ class Line {
 class FontFile {
   constructor (name) {
     this.name = name
-    this.values = {}
     this.metadata = {}
   }
 
@@ -91,6 +90,7 @@ class FontFile {
     return result
   }
 
+  // Parse a .fnt file
   readValues (data) {
     let lines = data.split('\n')
     for (let i in lines) {
@@ -101,9 +101,7 @@ class FontFile {
       for (let j in lineSplit) {
         let valuePairs = lineSplit[j].split('=')
         if (valuePairs.length === 2) {
-          let key = valuePairs[0]
+          lineValues[valuePairs[0]] = valuePairs[1]
-          let val = valuePairs[1]
-          lineValues[key] = val
         }
       }
 
@@ -114,16 +112,11 @@ class FontFile {
       } else if (lineSplit[0] === 'common') {
         let lineHeightPixels = this.getValue(lineValues, 'lineHeight') - this.paddingHeight
         this.vertPerPixelSize = LINE_HEIGHT / lineHeightPixels
-        this.horizPixelSize = this.vertPerPixelSize / aspectRatio
+        this.horizPixelSize = this.vertPerPixelSize / Screen.aspectRatio
+        this.scaleWidth = this.getValue(lineValues, 'scaleW')
       } else if (lineSplit[0] === 'char') {
-        let c = this.loadCharacter(lineValues, this.getValue(this.values, 'scaleW'))
+        let c = this.loadCharacter(lineValues, this.scaleWidth)
         if (c) this.metadata[c.id] = c
-        continue
-      } else if (lineSplit[0] === 'kernings' || lineSplit[0] === 'kerning' || lineSplit[0] === 'chars') {
-        continue
-      }
-      for (let j in lineValues) {
-        this.values[j] = lineValues[j]
       }
     }
   }
@@ -156,7 +149,6 @@ class FontFile {
     let load = await Resource.GET('/assets/fonts/' + fontName + '.fnt')
     let file = new FontFile(fontName)
     file.readValues(load)
-    console.log(file)
     return file
   }
 }
@@ -168,21 +160,25 @@ class Font {
     this.texture = null
   }
 
+  // Load font data from a .fnt file and create a Font object with it
   static async fromFile (name) {
     let meta = await FontFile.fromFile(name)
     return new Font(name, meta)
   }
 
+  // Load font texture
   async loadTextures (gl) {
     this.texture = await Texture.createTexture2D(gl, await Resource.loadImage('/assets/fonts/' + this.name + '.png'), false, gl.LINEAR)
   }
 
+  // Create a renderable mesh for a text
   createTextMesh (gl, text) {
     let lines = this.createStructure(text)
     let data = this.createQuadVertices(text, lines)
     return Mesh.constructFromVerticesUVs(gl, data.vertices, data.textureCoords)
   }
 
+  // Create a structure of lines, words and characters in order to generate the vertices properly
   createStructure (text) {
     let chars = text.asCharacters
     let lines = []
@@ -221,6 +217,7 @@ class Font {
     return lines
   }
 
+  // Add final word
   completeStructure (lines, currentLine, currentWord, text) {
     let added = currentLine.attemptToAddWord(currentWord)
     if (!added) {
@@ -232,6 +229,7 @@ class Font {
     return lines
   }
 
+  // Create text vertices
   createQuadVertices (text, lines) {
     text.lines = lines.length
     let cursorX = 0
@@ -259,6 +257,7 @@ class Font {
     return { vertices, textureCoords }
   }
 
+  // Create text vertex coordinates for a specific character
   addVerticesForCharacter (cursorX, cursorY, character, fontSize, vertices) {
     let x = cursorX + (character.xOffset * fontSize)
     let y = cursorY + (character.yOffset * fontSize)
@@ -271,6 +270,7 @@ class Font {
     this.addVertices(vertices, properX, properY, properMaxX, properMaxY)
   }
 
+  // Create text vertex coordinates
   addVertices (vertices, x, y, maxX, maxY) {
     vertices.push(x)
     vertices.push(y)
@@ -286,6 +286,7 @@ class Font {
     vertices.push(y)
   }
 
+  // Create text texture coordinates
   addTexCoords (texCoords, x, y, maxX, maxY) {
     texCoords.push(x)
     texCoords.push(y)
@@ -312,6 +313,7 @@ class GUIText extends Node2D {
     this.color = [0.0, 0.0, 0.0]
   }
 
+  // Do not scale the transform like we do with regular GUIs
   updateTransform () {
     let matrix = mat4.create()
     mat4.translate(matrix, matrix, [this.pos[0], this.pos[2], 0.0])
@@ -343,6 +345,7 @@ class GUIText extends Node2D {
     return this.size[2]
   }
 
+  // Return all characters as their ascii code
   get asCharacters () {
     let chars = []
     for (let i = 0; i < this.text.length; i++) {
@@ -352,6 +355,8 @@ class GUIText extends Node2D {
   }
 
   draw (gl, shader) {
+    // Let only the font shader be used to render text
+    if (shader.name !== 'font') return super.draw(gl, shader)
     const transformLocation = shader.getUniformLocation(gl, 'uTransformation')
     const colorLocation = shader.getUniformLocation(gl, 'uColor')
     gl.uniformMatrix4fv(transformLocation, false, this.transform)
@@ -369,8 +374,8 @@ class FontRenderer {
     for (let i in nodes) {
       let node = nodes[i]
       if (!(node instanceof GUIText)) {
-        if (node.children) {
+        if (node.children.length) {
-          textNodes.concat(this.discoverTextNodes(node.children))
+          textNodes = textNodes.concat(this.discoverTextNodes(node.children))
         }
         continue
       }
@@ -379,7 +384,8 @@ class FontRenderer {
     return textNodes
   }
 
-  draw (gl, nodes) {
+  draw (gl, cam, nodes) {
+    // Discover all nodes in the array that are texts
     let fontPairs = {}
     let textNodes = this.discoverTextNodes(nodes)
     for (let i in textNodes) {
@@ -399,6 +405,7 @@ class FontRenderer {
       }
     }
 
+    // Start rendering individual text arrays
     this.shader.use(gl)
     gl.enable(gl.BLEND)
     gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
@@ -406,8 +413,10 @@ class FontRenderer {
     for (let i in fontPairs) {
       let texts = fontPairs[i]
       let font = this.fonts[i]
+      // Set font's map as the texture
       gl.activeTexture(gl.TEXTURE0)
       gl.bindTexture(font.texture.type, font.texture.id)
+      // Draw all texts
       for (let j in texts) {
         let text = texts[j]
         text.draw(gl, this.shader)

src/engine/gui/index.js

@@ -175,7 +175,11 @@ class GUIImage extends Node2D {
     super.draw(gl, shader, quad)
     if (!this.active) return
     gl.activeTexture(gl.TEXTURE0)
+    if (!this.texture.type) {
+      gl.bindTexture(gl.TEXTURE_2D, this.texture)
+    } else {
       gl.bindTexture(this.texture.type, this.texture.id)
+    }
 
     // Set transformation matrix
     const transformLocation = shader.getUniformLocation(gl, 'uTransformationMatrix')
@@ -199,7 +203,7 @@ class GUIRenderer {
     return this.quad
   }
 
-  draw (gl, nodes) {
+  draw (gl, cam, nodes) {
     if (typeof nodes !== 'object') nodes = [ nodes ]
     this.shader.use(gl)
     this.quad.prepare(gl, this.shader)

src/engine/index.js

@@ -35,7 +35,7 @@ class Engine {
     return this.screen.gl
   }
 
-  render () {
+  prepare () {
     // Set clear color to black, fully opaque
     gl.clearColor(0.0, 0.0, 0.0, 1.0)
 
@@ -48,7 +48,9 @@ class Engine {
     // Enable back-face culling
     gl.enable(gl.CULL_FACE)
     gl.cullFace(gl.BACK)
+  }
 
+  render () {
     // Render functions
     for (let i in this.rst) {
       this.rst[i](gl)
@@ -98,4 +100,4 @@ class Engine {
   }
 }
 
-export default Engine
+export default new Engine()

src/engine/screen.js

@@ -11,11 +11,8 @@ class Screen {
       return
     }
 
+    this.loadExtensions()
     document.body.appendChild(this._el)
-
-    window.addEventListener('resize', (e) => {
-      this.resize()
-    }, false)
   }
 
   get gl () {
@@ -31,6 +28,12 @@ class Screen {
     this._el.height = window.innerHeight
   }
 
+  loadExtensions () {
+    this._gl.drawBuffers = this._gl.getExtension('WEBGL_draw_buffers')
+    this._gl.getExtension('WEBGL_depth_texture')
+    this._gl.getExtension('OES_texture_float')
+  }
+
   get width () {
     return this._el.width
   }
@@ -38,6 +41,10 @@ class Screen {
   get height () {
     return this._el.height
   }
+
+  get aspectRatio () {
+    return this.width / this.height
+  }
 }
 
 export default new Screen()

src/index.js

@@ -6,12 +6,13 @@ import loadMesh from './engine/mesh/loader'
 import { Environment } from './engine/environment'
 import { LODTerrain } from './engine/components/terrain/lod'
 import { Skybox } from './engine/components/skybox'
+// import { WaterTile } from './engine/components/water'
 import { SimplexHeightMap } from './engine/components/terrain/heightmap'
 import { Material, Texture } from './engine/mesh/material'
 import { GUIRenderer, GUIImage, Dim4 } from './engine/gui'
 import { FontRenderer, GUIText, Font } from './engine/gui/font'
 
-let game = new Engine()
+let game = Engine
 let env = new Environment()
 let gui = new GUIRenderer()
 let fnt = new FontRenderer()
@@ -21,9 +22,14 @@ async function pipeline () {
   let shader = await game.shaders.createShaderFromFiles(game.gl, 'basic', false)
   let terrainShader = await game.shaders.createShaderFromFiles(game.gl, 'terrain', false)
   let skyboxShader = await game.shaders.createShaderFromFiles(game.gl, 'skybox', false)
+  // let waterShader = await game.shaders.createShaderFromFiles(game.gl, 'water', false)
 
   entity.setRotation([0.0, 0.0, -90.0])
 
+  // let water = new WaterTile([100.0, 0.0, 100.0], 100.0)
+  // water.initialize(game.gl)
+  // await water.useDUDV(game.gl, 'dudv')
+
   let arialFont = await Font.fromFile('arial')
   await arialFont.loadTextures(game.gl)
 
@@ -33,10 +39,12 @@ async function pipeline () {
 
   let itms = [
     new GUIImage(await Texture.createTexture2D(game.gl, await Resource.loadImage('noisy.png'), false, game.gl.LINEAR),
-      new Dim4(-0.9, 0.0, 0.9, 0.0), new Dim4(0.1, 0.0, 0.1, 0.0)),
+      new Dim4(-0.9, 0.0, 0.9, 0.0), new Dim4(0.1, 0.0, 0.1, 0.0))
-    new GUIText('this is example text!\nmulti line!', arialFont, 2, new Dim4(0.1, 0.0, -0.2, 0.0), new Dim4(1.0, 0.0, 0.3, 0.0), true)
   ]
-  itms[1].color = [1.0, 0.0, 0.2]
+  // Nesting test
+  itms[0].addChild(new GUIText('this is example text!\nmulti line!', arialFont, 1.5, new Dim4(0.1, 0.0, -0.1, 0.0), new Dim4(1.0, 0.0, 0.3, 0.0), false))
+  itms[0].children[0].color = [1.0, 0.0, 0.2]
+  itms[0].updateTransform()
 
   // Create a height map based on OpenSimplex noise
   let hmap = new SimplexHeightMap(1, 1, 256, 50)
@@ -58,7 +66,7 @@ async function pipeline () {
   terrain.setMaterial(material)
 
   // Create and initialize the camera
-  let cam = new Camera([-200.0, 1.0, 0.0])
+  let cam = new Camera([-32.0, 100.0, -32.0], [0.8, -0.6, 0.0])
   cam.updateProjection(game.gl)
 
   // Create skybox
@@ -67,6 +75,9 @@ async function pipeline () {
   // Load textures and generate a mesh
   await skybox.initialize(game.gl)
 
+  // itms.push(new GUIImage(water.fbos.reflectionTexture, new Dim4(-0.9, 0.0, 0.9, 0.0), new Dim4(0.1, 0.0, 0.1, 0.0)))
+  // itms.push(new GUIImage(water.fbos.refractionTexture, new Dim4(-0.3, 0.0, 0.9, 0.0), new Dim4(0.1, 0.0, 0.1, 0.0)))
+
   // Update function for camera and terrain
   game.addUpdateFunction(function (dt) {
     if (game.input.isDown('w')) {
@@ -91,8 +102,9 @@ async function pipeline () {
     terrain.updateLODMesh(game.gl)
   })
 
-  // Render function for the triangle
+  function drawEverything (gl) {
-  game.addRenderFunction(function (gl) {
+    game.prepare()
+
     shader.use(gl)
     cam.draw(gl, shader)
     entity.draw(gl, shader)
@@ -108,14 +120,26 @@ async function pipeline () {
 
     // Draw terrain
     terrain.draw(gl, terrainShader)
+
     // Draw the skybox
     skyboxShader.use(gl)
     skybox.draw(gl, skyboxShader, cam)
-  })
+  }
 
+  // Render function for the triangle
   game.addRenderFunction(function (gl) {
-    gui.draw(gl, itms)
+    // water.reflect(gl, cam, drawEverything)
-    fnt.draw(gl, itms)
+    // water.refract(gl, cam, drawEverything)
+
+    drawEverything(gl)
+
+    // waterShader.use(gl)
+    // cam.draw(gl, waterShader)
+    // water.draw(gl, waterShader)
+
+    // Draw GUIs
+    gui.draw(gl, cam, itms)
+    fnt.draw(gl, cam, itms)
   })
 
   game.startGameLoop()