Simple GUI, Simple Skybox, fixed sequential model rendering warnings

assets/shaders/skybox.fs

@@ -0,0 +1,9 @@
+precision mediump float;
+
+varying vec3 uv;
+
+uniform samplerCube cubeMap;
+
+void main() {
+  gl_FragColor = textureCube(cubeMap, uv);
+}

assets/shaders/skybox.vs

@@ -0,0 +1,13 @@
+precision mediump float;
+
+attribute vec3 aVertexPosition;
+
+uniform mat4 uViewMatrix;
+uniform mat4 uProjectionMatrix;
+
+varying vec3 uv;
+
+void main() {
+  gl_Position = uProjectionMatrix * uViewMatrix * vec4(aVertexPosition, 1.0);
+  uv = aVertexPosition;
+}

src/engine/camera.js

@@ -23,6 +23,9 @@ class Camera extends Node {
     this.right = vec3.create()
     this.worldUp = vec3.fromValues(0.0, 1.0, 0.0)
 
+    this.nearPlane = ZNEAR
+    this.farPlane = ZFAR
+
     this.updateTransform()
   }
 
@@ -99,7 +102,7 @@ class Camera extends Node {
 
   updateProjection (gl) {
     let aspect = gl.canvas.width / gl.canvas.height
-    mat4.perspective(this.projection, this.fov, aspect, ZNEAR, ZFAR)
+    mat4.perspective(this.projection, this.fov, aspect, this.nearPlane, this.farPlane)
   }
 
   // Calculate the view matrix on-the-go

src/engine/components/index.js

@@ -224,6 +224,7 @@ class MeshInstance extends Node {
     // Draw the mesh
     this.mesh.prepare(gl, shader)
     this.mesh.draw(gl, shader)
+    this.mesh.postdraw(gl, shader)
 
     // Draw children
     super.draw(gl, shader)

src/engine/components/skybox/index.js

@@ -0,0 +1,106 @@
+import { Mesh } from '../../mesh'
+import { Texture } from '../../mesh/material'
+
+import { mat4 } from 'gl-matrix'
+
+import Resource from '../../resource'
+
+const FNAMES = ['right', 'left', 'top', 'bottom', 'back', 'front']
+const SIZE = 500
+
+class Skybox {
+  constructor (name, size = SIZE) {
+    this.name = name
+    this.size = size
+  }
+
+  async initialize (gl) {
+    await this.createTexture(gl)
+    this.createMesh(gl)
+  }
+
+  async createTexture (gl) {
+    let ready = []
+    for (let i in FNAMES) {
+      let real = this.name + '/' + FNAMES[i] + '.png'
+      let loaded = await Resource.loadImage(real)
+      ready[i] = loaded
+    }
+
+    let imgCube = Texture.createTextureCubeMap(gl, ready)
+    this.cubemap = imgCube
+  }
+
+  createMesh (gl) {
+    const vertices = [
+      -this.size, this.size, -this.size,
+      -this.size, -this.size, -this.size,
+      this.size, -this.size, -this.size,
+      this.size, -this.size, -this.size,
+      this.size, this.size, -this.size,
+      -this.size, this.size, -this.size,
+
+      -this.size, -this.size, this.size,
+      -this.size, -this.size, -this.size,
+      -this.size, this.size, -this.size,
+      -this.size, this.size, -this.size,
+      -this.size, this.size, this.size,
+      -this.size, -this.size, this.size,
+
+      this.size, -this.size, -this.size,
+      this.size, -this.size, this.size,
+      this.size, this.size, this.size,
+      this.size, this.size, this.size,
+      this.size, this.size, -this.size,
+      this.size, -this.size, -this.size,
+
+      -this.size, -this.size, this.size,
+      -this.size, this.size, this.size,
+      this.size, this.size, this.size,
+      this.size, this.size, this.size,
+      this.size, -this.size, this.size,
+      -this.size, -this.size, this.size,
+
+      -this.size, this.size, -this.size,
+      this.size, this.size, -this.size,
+      this.size, this.size, this.size,
+      this.size, this.size, this.size,
+      -this.size, this.size, this.size,
+      -this.size, this.size, -this.size,
+
+      -this.size, -this.size, -this.size,
+      -this.size, -this.size, this.size,
+      this.size, -this.size, -this.size,
+      this.size, -this.size, -this.size,
+      -this.size, -this.size, this.size,
+      this.size, -this.size, this.size
+    ]
+    this.mesh = Mesh.constructFromVertices(gl, vertices)
+  }
+
+  updateCamera (gl, shader, camera) {
+    const projloc = shader.getUniformLocation(gl, 'uProjectionMatrix')
+    const viewloc = shader.getUniformLocation(gl, 'uViewMatrix')
+
+    // Set translation to zero to prevent the skybox from moving in relation to the camera
+    let view = mat4.clone(camera.view)
+    view[12] = 0
+    view[13] = 0
+    view[14] = 0
+
+    gl.uniformMatrix4fv(projloc, false, camera.projection)
+    gl.uniformMatrix4fv(viewloc, false, view)
+  }
+
+  draw (gl, shader, camera) {
+    camera && this.updateCamera(gl, shader, camera)
+
+    gl.activeTexture(gl.TEXTURE0)
+    gl.bindTexture(this.cubemap.type, this.cubemap.id)
+    this.mesh.prepare(gl, shader)
+    this.mesh.draw(gl, shader)
+    this.mesh.postdraw(gl, shader)
+  }
+}
+
+export { Skybox }

src/engine/components/terrain/basic.js

@@ -59,6 +59,7 @@ class Terrain extends Node {
   }
 
   draw (gl, shader) {
+    super.draw(gl, shader)
     if (!this.mesh) return
     // Set model transform matrix uniform
     const transformLocation = shader.getUniformLocation(gl, 'uModelMatrix')
@@ -66,8 +67,7 @@ class Terrain extends Node {
 
     this.mesh.prepare(gl, shader)
     this.mesh.draw(gl, shader)
-
-    super.draw(gl, shader)
+    this.mesh.postdraw(gl, shader)
   }
 }
 

src/engine/components/terrain/lod.js

@@ -105,6 +105,7 @@ class TerrainNode extends Node {
 
     this.mesh.prepare(gl, shader)
     this.mesh.draw(gl, shader)
+    this.mesh.postdraw(gl, shader)
   }
 
   get generated () {

src/engine/gui/index.js

@@ -1,4 +1,25 @@
-import { clamp } from '../utility'
+import { Mesh } from '../mesh'
+import { mat4 } from 'gl-matrix'
+
+const VERTEX_SHADER = `
+precision mediump float;
+attribute vec2 aVertexPosition;
+varying vec2 uv;
+uniform mat4 uTransformationMatrix;
+void main() {
+  gl_Position = uTransformationMatrix * vec4(aVertexPosition, 0.0, 1.0);
+  uv = vec2((aVertexPosition.x+1.0)/2.0, 1.0 - (aVertexPosition.y+1.0)/2.0);
+}
+`
+
+const FRAGMENT_SHADER = `
+precision mediump float;
+varying vec2 uv;
+uniform sampler2D texture0;
+void main() {
+  gl_FragColor = texture2D(texture0, uv);
+}
+`
 
 class Dim4 {
   constructor (scX, ofX, scY, ofY) {
@@ -67,10 +88,34 @@ class Node2D {
 
     this.parent = null
     this.children = []
+
+    this.transform = mat4.create()
+
+    this.updateTransform()
   }
 
   updateTransform () {
+    let matrix = mat4.create()
+    mat4.translate(matrix, matrix, [this.pos[0], this.pos[2], 0.0])
+    mat4.scale(matrix, matrix, [this.size[0], this.size[2], 1.0])
+    if (this.rotation !== 0.0) {
+      mat4.rotate(matrix, matrix, this.rotation * Math.PI / 180, [0.0, 0.0, 1.0])
+    }
 
+    // Add parent's transform to this
+    if (this.parent) {
+      mat4.mul(matrix, this.parent.transform, matrix)
+    }
+
+    // Set the matrix
+    this.transform = matrix
+
+    // Update children's transforms
+    for (let i in this.children) {
+      let child = this.children[i]
+      if (!(child instanceof Node2D)) continue
+      child.updateTransform()
+    }
   }
 
   // Getters
@@ -83,12 +128,12 @@ class Node2D {
   }
 
   // Draw base
-  draw (gl) {
+  draw (gl, shader, quad) {
     // Nothing to draw here, so just draw children
     for (let i in this.children) {
       let child = this.children[i]
       if (!(child instanceof Node2D)) continue
-      child.draw(gl)
+      child.draw(gl, shader, quad)
     }
   }
 
@@ -118,3 +163,55 @@ class Node2D {
     this.parent = p
   }
 }
+
+class GUIImage extends Node2D {
+  constructor (texture, pos, size, rotation) {
+    super(pos, size, rotation)
+    this.texture = texture
+    this.active = true
+  }
+
+  draw (gl, shader, quad) {
+    super.draw(gl, shader, quad)
+    if (!this.active) return
+    gl.activeTexture(gl.TEXTURE0)
+    gl.bindTexture(this.texture.type, this.texture.id)
+
+    // Set transformation matrix
+    const transformLocation = shader.getUniformLocation(gl, 'uTransformationMatrix')
+    gl.uniformMatrix4fv(transformLocation, false, this.transform)
+
+    // Draw the quad
+    quad.draw(gl, shader, gl.TRIANGLE_STRIP)
+  }
+}
+
+class GUIRenderer {
+  async initialize (game) {
+    this.shader = await game.shaders.createShader(game.gl, 'gui', VERTEX_SHADER, FRAGMENT_SHADER)
+    this.createQuad(game.gl)
+  }
+
+  // Reusable quad mesh for rendering GUIs
+  createQuad (gl) {
+    if (this.quad) return this.quad
+    this.quad = Mesh.constructFromVertices(gl, [-1, 1, -1, -1, 1, 1, 1, -1], 2)
+    return this.quad
+  }
+
+  draw (gl, nodes) {
+    if (typeof nodes !== 'object') nodes = [ nodes ]
+    this.shader.use(gl)
+    this.quad.prepare(gl, this.shader)
+    gl.enable(gl.BLEND)
+    gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
+    gl.disable(gl.DEPTH_TEST)
+    for (let i in nodes) {
+      nodes[i].draw(gl, this.shader, this.quad)
+    }
+    gl.enable(gl.DEPTH_TEST)
+    gl.disable(gl.BLEND)
+  }
+}
+
+export { Dim4, GUIRenderer, GUIImage }

src/engine/index.js

@@ -37,7 +37,7 @@ class Engine {
 
   render () {
     // Set clear color to black, fully opaque
-    gl.clearColor(0.0, 0.7, 1.0, 1.0)
+    gl.clearColor(0.0, 0.0, 0.0, 1.0)
 
     // Clear the color buffer with specified clear color
     gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

src/engine/mesh/index.js

@@ -38,21 +38,38 @@ class Mesh {
     return mesh
   }
 
+  static constructFromVertices (gl, vertices, dimensions = 3) {
+    let pos = Mesh.loadToBuffer(gl, gl.ARRAY_BUFFER, new Float32Array(vertices))
+    let mesh = new Mesh()
+    mesh.posBuffer = pos
+    mesh.vertices = vertices
+    mesh.vertexCount = vertices.length / dimensions
+    mesh.vertexLayout = dimensions
+    gl.bindBuffer(gl.ARRAY_BUFFER, null)
+
+    return mesh
+  }
+
   bindBuffers (gl, shader) {
+    this._bufferCount = 1
+
+    let d = this.vertexLayout || 3
     gl.bindBuffer(gl.ARRAY_BUFFER, this.posBuffer)
-    shader.setAttribute(gl, 'aVertexPosition', 3, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0)
+    shader.setAttribute(gl, 'aVertexPosition', d, false, d * Float32Array.BYTES_PER_ELEMENT, 0)
 
     if (this.nms && shader.hasAttribute(gl, 'aNormal')) {
       gl.bindBuffer(gl.ARRAY_BUFFER, this.nms)
       shader.setAttribute(gl, 'aNormal', 3, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0)
+      this._bufferCount++
     }
 
     if (this.uvs && shader.hasAttribute(gl, 'aTexCoords')) {
       gl.bindBuffer(gl.ARRAY_BUFFER, this.uvs)
       shader.setAttribute(gl, 'aTexCoords', 2, false, 2 * Float32Array.BYTES_PER_ELEMENT, 0)
+      this._bufferCount++
     }
 
-    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.ebo)
+    this.ebo && gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.ebo)
   }
 
   prepare (gl, shader) {
@@ -69,7 +86,14 @@ class Mesh {
     if (this.indices) {
       gl.drawElements(mode, this.indices.length, gl.UNSIGNED_SHORT, 0)
     } else {
-      gl.drawArrays(mode, 0, this.vertices.length)
+      gl.drawArrays(mode, 0, this.vertexCount || this.vertices.length / (this.vertexLayout || 3))
+    }
+  }
+
+  // Unbind all attrib arrays after drawing something
+  postdraw (gl, shader) {
+    for (let i = 0; i < this._bufferCount; i++) {
+      gl.disableVertexAttribArray(i)
     }
   }
 

src/engine/mesh/material.js

@@ -1,13 +1,22 @@
 import Resource from '../resource'
 
 class Texture {
-  static createTexture2D (gl, img) {
+  static createTexture2D (gl, img, flip = true, filtering, repeat = gl.REPEAT) {
     let tex = gl.createTexture()
     gl.bindTexture(gl.TEXTURE_2D, tex)
-    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true)
+    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, flip)
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img)
 
-    gl.generateMipmap(gl.TEXTURE_2D)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, repeat)
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, repeat)
+
+    if (filtering) {
+      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, filtering)
+      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, filtering)
+    } else {
+      gl.generateMipmap(gl.TEXTURE_2D)
+    }
+
     gl.bindTexture(gl.TEXTURE_2D, null)
 
     let oTex = new Texture()
@@ -16,9 +25,39 @@ class Texture {
 
     return oTex
   }
+
+  static createTextureCubeMap (gl, img) {
+    if (!img || img.length !== 6) throw new Error('createTextureCubeMap() requires six images!')
+    let tex = gl.createTexture()
+    gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex)
+
+    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false)
+
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[0])
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_X, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[1])
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Y, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[2])
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[3])
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Z, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[4])
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img[5])
+
+    gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
+    gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
+
+    gl.bindTexture(gl.TEXTURE_CUBE_MAP, null)
+
+    let oTex = new Texture()
+    oTex.type = gl.TEXTURE_CUBE_MAP
+    oTex.id = tex
+
+    return oTex
+  }
 }
 
 class Material {
+  constructor (textures) {
+    this.textures = textures
+  }
+
   async loadTextures (gl) {
     if (this.textures) {
       for (let ti in this.textures) {

src/engine/screen.js

@@ -4,7 +4,7 @@ class Screen {
   constructor () {
     this._el = document.createElement('canvas')
     this.resize()
-    this._gl = this._el.getContext('webgl')
+    this._gl = this._el.getContext('webgl', { alpha: false })
 
     if (!this._gl) {
       alert('Your machine or browser does not support WebGL!')

src/index.js

@@ -1,34 +1,50 @@
 import Engine from './engine'
 import Camera from './engine/camera'
+import Resource from './engine/resource'
 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 { SimplexHeightMap } from './engine/components/terrain/heightmap'
-import { Material } from './engine/mesh/material'
+import { Material, Texture } from './engine/mesh/material'
+import { GUIRenderer, GUIImage, Dim4 } from './engine/gui'
 
 let game = new Engine()
 let env = new Environment()
+let gui = new GUIRenderer()
 
-// let t = 0
 async function pipeline () {
   let entity = await loadMesh(game.gl, 'test')
   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)
 
   entity.setRotation([0.0, 0.0, -90.0])
 
+  // Initialize GUI
+  await gui.initialize(game)
+  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))
+  ]
+
   // Create a height map based on OpenSimplex noise
   let hmap = new SimplexHeightMap(1, 1, 256, 50)
 
-  // Create a terrain
+  // Create a terrain instance
   let terrain = new LODTerrain([0.0, 0.0, 0.0], 1024, 1024, 850, 4)
 
   // Terrain material
-  let material = new Material()
-  material.textures = ['grass-1024.jpg']
+  let material = new Material(['grass-1024.jpg'])
   await material.loadTextures(game.gl)
 
+  // test code
+  for (let i in entity.children) {
+    entity.children[i].mesh.material = material
+  }
+
+  // Set generator and material for terrain
   terrain.setGenerator(hmap)
   terrain.setMaterial(material)
 
@@ -36,7 +52,13 @@ async function pipeline () {
   let cam = new Camera([-200.0, 1.0, 0.0])
   cam.updateProjection(game.gl)
 
-  // Update function for camera
+  // Create skybox
+  let skybox = new Skybox('skybox', cam.farPlane / 2)
+
+  // Load textures and generate a mesh
+  await skybox.initialize(game.gl)
+
+  // Update function for camera and terrain
   game.addUpdateFunction(function (dt) {
     if (game.input.isDown('w')) {
       cam.processKeyboard(0, dt)
@@ -50,6 +72,7 @@ async function pipeline () {
       cam.processKeyboard(3, dt)
     }
 
+    // Panning
     if (game.input.mouseMoved && game.input.mouse.btn0) {
       cam.processMouseMove(game.input.mouseOffset)
     }
@@ -57,10 +80,6 @@ async function pipeline () {
     // Update detail levels
     terrain.update(game.gl, cam)
     terrain.updateLODMesh(game.gl)
-
-    // TESTING: Move model forward
-    // t = t + 0.1
-    // entity.setPosition([t, 0.0, 0.0])
   })
 
   // Render function for the triangle
@@ -80,6 +99,13 @@ async function pipeline () {
 
     // Draw terrain
     terrain.draw(gl, terrainShader)
+    // Draw the skybox
+    skyboxShader.use(gl)
+    skybox.draw(gl, skyboxShader, cam)
+  })
+
+  game.addRenderFunction(function (gl) {
+    gui.draw(gl, itms)
   })
 
   game.startGameLoop()