MachineSystem/visuals.js at master · scgruber/MachineSystem · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
// Machine System
// Sam Gruber

// Global GL data structure
var glData = {
  shaderProgram: null,
  pMatrix: mat4.create(),
  mvMatrix: mat4.create(),
  mvMatrixStack: [],
  buf: {
    nodeVertexPos: null,
    rackVertexCol: null,
    physVertexCol: null,
    virtVertexCol: null
  },
  view: {
    x: 0,
    y: 0,
    z: -3000
  },
  tic: 0
};

var gl;

function initGL(canvas) {
  try {
    gl = canvas.getContext('experimental-webgl');
    gl.vpWidth = canvas.width;
    gl.vpHeight = canvas.height;
  } catch(e) {}

  if (!gl) {
    alert("Could not intialize WebGL!");
  }
}

function initShaders() {
  var fragmentShader = getShader('frag');
  var vertexShader = getShader('vert');

  glData.shaderProgram = gl.createProgram();
  gl.attachShader(glData.shaderProgram, vertexShader);
  gl.attachShader(glData.shaderProgram, fragmentShader);
  gl.linkProgram(glData.shaderProgram);

  if (!gl.getProgramParameter(glData.shaderProgram, gl.LINK_STATUS)) {
    alert('Could not initialize shaders');
  }

  gl.useProgram(glData.shaderProgram);

  glData.shaderProgram.vertexPos = gl.getAttribLocation(glData.shaderProgram, 'aVertexPosition');
  gl.enableVertexAttribArray(glData.shaderProgram.vertexPos);

  glData.shaderProgram.vertexCol = gl.getAttribLocation(glData.shaderProgram, 'aVertexColor');
  gl.enableVertexAttribArray(glData.shaderProgram.vertexCol);

  glData.shaderProgram.pMatrixUniform = gl.getUniformLocation(glData.shaderProgram, 'uPMatrix');
  glData.shaderProgram.mvMatrixUniform = gl.getUniformLocation(glData.shaderProgram, 'uMVMatrix');
}

function setMatrixUniforms() {
  gl.uniformMatrix4fv(glData.shaderProgram.pMatrixUniform, false, glData.pMatrix);
  gl.uniformMatrix4fv(glData.shaderProgram.mvMatrixUniform, false, glData.mvMatrix);
}

function mvPushMatrix() {
  var copy = mat4.create();
  mat4.set(glData.mvMatrix, copy);
  glData.mvMatrixStack.push(copy);
}

function mvPopMatrix() {
  if (glData.mvMatrixStack.length == 0) {
    throw "invalid popMatrix!";
  }
  glData.mvMatrix = glData.mvMatrixStack.pop();
}

function initBuffers() {
  glData.buf.nodeVertexPos = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, glData.buf.nodeVertexPos);
  var vertices = [
    1.0,  1.0,  0.0,
   -1.0,  1.0,  0.0,
    1.0, -1.0,  0.0,
   -1.0, -1.0,  0.0
  ];
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
  glData.buf.nodeVertexPos.itemSize = 3;
  glData.buf.nodeVertexPos.numItems = 4;


  glData.buf.rackVertexCol = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, glData.buf.rackVertexCol);
  colors = [];
  for (var i=0; i<4; i++) {
    colors = colors.concat([1.0, 0.5, 0.5, 1.0]);
  }
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(colors), gl.STATIC_DRAW);
  glData.buf.rackVertexCol.itemSize = 4;
  glData.buf.rackVertexCol.numItems = 4;


  glData.buf.physVertexCol = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, glData.buf.physVertexCol);
  colors = [];
  for (var i=0; i<4; i++) {
    colors = colors.concat([0.5, 1.0, 0.5, 1.0]);
  }
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(colors), gl.STATIC_DRAW);
  glData.buf.physVertexCol.itemSize = 4;
  glData.buf.physVertexCol.numItems = 4;


  glData.buf.virtVertexCol = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, glData.buf.virtVertexCol);
  colors = [];
  for (var i=0; i<4; i++) {
    colors = colors.concat([0.5, 0.5, 1.0, 1.0]);
  }
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(colors), gl.STATIC_DRAW);
  glData.buf.virtVertexCol.itemSize = 4;
  glData.buf.virtVertexCol.numItems = 4;
}

function drawScene(interval) {
  gl.viewport(0, 0, gl.vpWidth, gl.vpHeight);
  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

  mat4.perspective(45, gl.vpWidth / gl.vpHeight, 0.1, 5000.0, glData.pMatrix);
  mat4.identity(glData.mvMatrix);
  mat4.translate(glData.mvMatrix, [glData.view.x, glData.view.y, glData.view.z]);

  for (r in machinesystem.rackList) {
    machinesystem.rackList[r].draw(interval);
  }
}

function updateScene() {
  return;
}

function doNextFrame() {
  toc = new Date().getTime();
  requestAnimFrame(doNextFrame);
  drawScene((toc-glData.tic)/100.0);
  updateScene();
  glData.tic = toc;
}

function webGLStart() {
  var canvas = document.getElementById('visualization');
  initGL(canvas);
  initShaders();
  initBuffers();

  gl.clearColor(0.0, 0.0, 0.0, 1.0);
  gl.enable(gl.DEPTH_TEST);

  doNextFrame();

  glData.tic = new Date().getTime();
}