/*
   Introductory SceneJS scene which demonstrates using the frameBuf node for render-to-texture
  
   More info:
  
   github.com/xeolabs/scenejs/wiki/frameBuf
  
   */
  SceneJS.createScene({
  
    type: "scene",
  
    /* ID that we'll access the scene by when we want to render it
     */
    id: "theScene",
  
    /* Bind scene to a WebGL canvas:
     */
    canvasId: "theCanvas",
  
    /* You can optionally write logging to a DIV - scene will log to the console as well.
     */
    loggingElementId: "theLoggingDiv",
  
    nodes: [
  
      /*-------------------------------------------------------------------------------------------
       * First subgraph renders our rotating teapot, with light blue backdrop, to a texture.
       *
       * The subgraph is wrapped in an frameBuf node, which captures each frame the subgraph
       * renders and makes it available by ID as an image source for the texture node defined in the
       * second subgraph, defined further down in this example.
       *
       * The frameBuf captures the frames to a hidden frame buffer, so they will not render by
       * themselves and will only be visible via the texture.
       *
       * This example assumes that you know what the various other node types are - see the
       * other examples first if you're not sure.
       *------------------------------------------------------------------------------------------*/
  
      {
        type: "frameBuf",
        id: "teapot-frameBuf",
  
        nodes: [
  
          {
            type: "lookAt",
            eye : { x: 0.0, y: 10.0, z: -15 },
            look : { y:1.0 },
            up : { y: 1.0 },
  
            nodes: [
              {
                type: "camera",
                optics: {
                  type: "perspective",
                  fovy : 25.0,
                  aspect : 1,
                  near : 0.10,
                  far : 300.0
                },
  
                nodes: [
                  {
                    type: "light",
                    mode:          "dir",
                    color:         { r: 1.0, g: 1.0, b: 1.0 },
                    diffuse:        true,
                    specular:        true,
                    dir:          { x: 0.0, y: 0.0, z: 1.0 }
                  },
  
                  /* Light blue backdrop slab
                   */
                  {
                    type: "material",
                    emit: 20,
                    baseColor:   { r: 0.0, g: 1, b:1 },
                    specularColor: { r: 0., g: 0., b: 1. },
                    specular:    0.9,
                    shine:     100.0,
  
                    nodes: [
                      {
                        type:"translate",
                        z:15,
                        nodes: [
                          {
                            type:"scale",
                            x:20,
                            y:20,
                            nodes:[
                              {
                                type : "cube"
                              }
                            ]
                          }
                        ]
                      }
                    ]
                  },
  
                  /* Teapot, oriented with a couple of rotations
                   */
                  {
                    type: "rotate",
                    id: "teapot-pitch",
                    angle: 180.0,
                    x : 1.0,
  
                    nodes: [
                      {
                        type: "rotate",
                        id: "teapot-yaw",
                        angle: 0.0,
                        y : 1.0,
  
                        nodes: [
  
                          {
                            type: "material",
                            emit: 0,
                            baseColor:   { r: 0.5, g: 0.5, b: 0.9 },
                            specularColor: { r: 0.9, g: 0.9, b: 0.9 },
                            specular:    0.9,
                            shine:     100.0,
  
                            nodes: [
                              {
                                type : "teapot"
                              }
                            ]
                          }
                        ]
                      }
                    ]
                  }
                ]
              }
            ]
          }
        ]
      } ,
      {
  
        type: "shader",
  
        coreId: "stationary-shader",
  
        shaders: [
  
          /* Vertex shader with our custom function to intercept the matrix
           */
          {
            stage: "vertex",
            code: [
  
              "mat4 myViewMatrix(mat4 m) {",
              "  return mat4(1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0); ",
              "}",
  
              "mat4 myProjMatrix(mat4 m) {",
              "  return mat4(1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0); ",
              "}"
            ],
  
            hooks: {
              viewMatrix: "myViewMatrix",
              projMatrix: "myProjMatrix"
            }
          }
        ],
  
        nodes: [
  
          {
            type: "texture",
            layers: [
              {
                frameBuf: "teapot-frameBuf",
                applyTo:"baseColor",
                blendMode: "multiply"
              }
            ],
  
            nodes: [
  
              /*---------------------------------------------------------------------
               * Material properties for the quad
               *--------------------------------------------------------------------*/
              {
                type: "material",
                baseColor: { r: 1, g: 1, b: 1 },
                specularColor: { r: 0.0, g: 0.0, b: 0.0 },
                emit:      1.0,
                specular:    0.9,
                shine:     3.0,
  
                nodes: [
  
                  /*------------------------------------------------------
                   * A large sphere geometry
                   *----------------------------------------------------*/
  
                      {
                        type:"scale",
                        x: 1,
                        y: 1030 / 700,
                        z: 1,
  
                        nodes: [
                          {
                            type: "quad"
                          }
                        ]
                      }
  
                ]
              }
  
            ]
          }
  
        ]
      }
    ]
  });
  
  /*----------------------------------------------------------------------
   * Scene rendering loop and mouse handler stuff follows
   *---------------------------------------------------------------------*/
  var yaw = 0;
  var pitch = 0;
  var lastX;
  var lastY;
  var dragging = false;
  
  var canvas = document.getElementById("theCanvas");
  
  function mouseDown(event) {
    lastX = event.clientX;
    lastY = event.clientY;
    dragging = true;
  }
  
  function mouseUp() {
    dragging = false;
  }
  
  var scene = SceneJS.scene("theScene");
  
  /* On a mouse drag, we'll re-render the scene, passing in
   * incremented angles in each time.
   */
  function mouseMove(event) {
    if (dragging) {
      yaw += (event.clientX - lastX) * 0.5;
      pitch += (event.clientY - lastY) * -0.5;
  
      //    scene.findNode("cube-yaw").set("angle", yaw);
      //    scene.findNode("cube-pitch").set("angle", pitch);
  
      lastX = event.clientX;
      lastY = event.clientY;
    }
  }
  
  canvas.addEventListener('mousedown', mouseDown, true);
  canvas.addEventListener('mousemove', mouseMove, true);
  canvas.addEventListener('mouseup', mouseUp, true);
  
  /* Start rendering the scene graph. On each frame, increment the rotation
   * of the teapot.
   */
  
  scene.start({
    idleFunc: function() {
      scene.findNode("teapot-yaw").inc("angle", 1);
      scene.findNode("teapot-pitch").inc("angle", .3);
  
    }
  });