emidander.github.com/webgl-game-of-life.html at master · emidander/emidander.github.com · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>WebGL Game of Life</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="">
    <meta name="author" content="">

    <script type="text/javascript" src="jquery-1.9.1.min.js"></script>
    <script type="text/javascript" src="gol.js"></script>
    <script type="text/javascript" src="gl-matrix-min.js"></script>
    <script type="text/javascript" src="webgl-utils.js"></script>

    <script id="shader-fs" type="x-shader/x-fragment">
        precision mediump float;

        varying vec4 vColor;

        void main(void) {
            gl_FragColor = vColor;
        }
    </script>

    <script id="shader-vs" type="x-shader/x-vertex">
        attribute vec3 aVertexPosition;

        uniform mat4 uPMVMatrix;
        uniform float uRotationFactor;

        varying vec4 vColor;

        void main(void) {
            gl_Position = uPMVMatrix * vec4(aVertexPosition, 1.0);
            vColor = vec4(uRotationFactor * vec3(1.0, 0.0, 0.0), 1.0);
        }
    </script>


  <script type="text/javascript">

    var gl;

    function initGL(canvas) {
      try {
        gl = canvas.getContext("experimental-webgl");
        gl.viewportWidth = canvas.width;
        gl.viewportHeight = canvas.height;
      } catch (e) {
      }
      if (!gl) {
        alert("Could not initialise WebGL.");
      }
    }

    function getShader(gl, id) {
      var shaderScript = document.getElementById(id);
      if (!shaderScript) {
          return null;
      }

      var shader;
      if (shaderScript.type == "x-shader/x-fragment") {
          shader = gl.createShader(gl.FRAGMENT_SHADER);
      } else if (shaderScript.type == "x-shader/x-vertex") {
          shader = gl.createShader(gl.VERTEX_SHADER);
      } else {
          return null;
      }

      gl.shaderSource(shader, shaderScript.innerHTML);
      gl.compileShader(shader);

      if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
          alert(gl.getShaderInfoLog(shader));
          return null;
      }

      return shader;
    }

    var shaderProgram;
    function initShaders() {
      var fragmentShader = getShader(gl, "shader-fs");
      var vertexShader = getShader(gl, "shader-vs");

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

      if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
        alert("Could not initialise shaders");
        return;
      }

      gl.useProgram(shaderProgram);

      shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
      gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);

      shaderProgram.pmvMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMVMatrix");
      shaderProgram.rotationFactorUniform = gl.getUniformLocation(shaderProgram, "uRotationFactor");
    }


    var squareVertexPositionBuffer;
    function initBuffers() {
      squareVertexPositionBuffer = gl.createBuffer();
      gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
      vertices = [
           0.5,  0.5,  0.0,
          -0.5,  0.5,  0.0,
           0.5, -0.5,  0.0,
          -0.5, -0.5,  0.0
          ];
      gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
      squareVertexPositionBuffer.itemSize = 3;
      squareVertexPositionBuffer.numItems = 4;
    }

    var modelViewMatrix = mat4.create();
    var projectionMatrix = mat4.create();
    function drawScene() {
      gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
      gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

      mat4.perspective(projectionMatrix, 45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0);

      for (var row = 0; row < rows; row++) {
        for (var col = 0; col < cols; col++) {
          console.log(golRotation[row][col]);
          mat4.translate(modelViewMatrix, mat4.create(), [col - cols / 2, row - rows / 2, -15]);
          var rotation = golRotation[row][col][0] + rotationFactor * (golRotation[row][col][1] - golRotation[row][col][0]);
          var rotatedModelViewMatrix = mat4.create();
          mat4.rotate(rotatedModelViewMatrix, modelViewMatrix, rotation, [0, 1, 0]);

          gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
          gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);

          var pmvMatrix = mat4.create();
          mat4.multiply(pmvMatrix, projectionMatrix, rotatedModelViewMatrix);
          gl.uniformMatrix4fv(shaderProgram.pmvMatrixUniform, false, pmvMatrix);
          gl.uniform1f(shaderProgram.rotationFactorUniform, 0.2 + 0.8 * (2.0 * rotation - Math.PI) / Math.PI);

          gl.drawArrays(gl.TRIANGLE_STRIP, 0, squareVertexPositionBuffer.numItems);
        }
      }
    }

    var lastUpdateTime = -9999999;
    var ROTATION_TIME = 700.0;
    var rotationFactor = 0.0;
    var readyForSwap = true;
    function update() {
      var timeNow = new Date().getTime();
      var elapsed = timeNow - lastUpdateTime;
      if (elapsed >= ROTATION_TIME) {
        if (readyForSwap) {
          var tmp = golArray;
          golArray = golArraySwap;
          golArraySwap = tmp;

          for (var row = 0; row < rows; row++) {
            for (var col = 0; col < cols; col++) {
              golRotation[row][col][0] = golRotation[row][col][1];
              golRotation[row][col][1] = golArray[row][col] ? Math.PI : Math.PI / 2.0;
            }
          }

          readyForSwap = false;
          setTimeout(function() {
            stepGameOfLife(golArray, golArraySwap, rows, cols);
            readyForSwap = true;
          }, 0);


          lastUpdateTime = timeNow;
          rotationFactor = 0.0;
        } else {
          console.log("Missed a swap!");
          rotationFactor = 1.0;
        }
      } else {
        rotationFactor = elapsed / ROTATION_TIME;
      }
    }

    function tick() {
      update();
      drawScene();
      requestAnimFrame(tick);
    }

    var golArray;
    var golArraySwap;
    var golRotation;
    var rows = 20;
    var cols = 20;
    function start() {

      // Set up Game of Life
      golArraySwap = createRandomGameOfLife(rows, cols, 0.4);
      golArray = createEmptyArray(rows, cols, false);
      golRotation =  createEmptyArray(rows, cols, []);
      for (var row = 0; row < rows; row++) {
        for (var col = 0; col < cols; col++) {
          golRotation[row][col] = new Array();
          golRotation[row][col][0] = Math.PI / 2.0;
          golRotation[row][col][1] = Math.PI / 2.0;
        }
      }


      var canvas = document.getElementById("webgl-canvas");
      initGL(canvas);
      initShaders()
      initBuffers();

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

      tick();
    }

  </script>

</head>

<body onload="start();">

  <h1>WebGL Game of life</h1>

  <canvas id="webgl-canvas" style="border: none;" width="500" height="500"></canvas>

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