Buffer.js

var Buffer, Color, Context, Edge, Face3, Face4, FacePolygon, Vec2, Vec3, Vec4, hasProperties, _ref;

_ref = require('pex-geom'), Vec2 = _ref.Vec2, Vec3 = _ref.Vec3, Vec4 = _ref.Vec4, Edge = _ref.Edge, Face3 = _ref.Face3, Face4 = _ref.Face4, FacePolygon = _ref.FacePolygon;

Color = require('pex-color').Color;

Context = require('./Context');

hasProperties = function(obj, list) {
  var prop, _i, _len;
  for (_i = 0, _len = list.length; _i < _len; _i++) {
    prop = list[_i];
    if (typeof obj[prop] === 'undefined') {
      return false;
    }
  }
  return true;
};

Buffer = (function() {
  function Buffer(target, type, data, usage) {
    this.gl = Context.currentContext;
    this.target = target;
    this.type = type;
    this.usage = usage || gl.STATIC_DRAW;
    this.dataBuf = null;
    if (data) {
      this.update(data, this.usage);
    }
  }

  Buffer.prototype.dispose = function() {
    this.gl.deleteBuffer(this.handle);
    return this.handle = null;
  };

  Buffer.prototype.update = function(data, usage) {
    var e, face, i, index, numIndices, v, _i, _j, _k, _l, _len, _len1, _len2, _len3, _len4, _len5, _len6, _len7, _m, _n, _o, _p;
    if (!this.handle) {
      this.handle = this.gl.createBuffer();
    }
    this.usage = usage || this.usage;
    if (!data || data.length === 0) {
      return;
    }
    if (!isNaN(data[0])) {
      if (!this.dataBuf || this.dataBuf.length !== data.length) {
        this.dataBuf = new this.type(data.length);
      }
      for (i = _i = 0, _len = data.length; _i < _len; i = ++_i) {
        v = data[i];
        this.dataBuf[i] = v;
        this.elementSize = 1;
      }
    } else if (hasProperties(data[0], ['x', 'y', 'z', 'w'])) {
      if (!this.dataBuf || this.dataBuf.length !== data.length * 4) {
        this.dataBuf = new this.type(data.length * 4);
        this.elementSize = 4;
      }
      for (i = _j = 0, _len1 = data.length; _j < _len1; i = ++_j) {
        v = data[i];
        this.dataBuf[i * 4 + 0] = v.x;
        this.dataBuf[i * 4 + 1] = v.y;
        this.dataBuf[i * 4 + 2] = v.z;
        this.dataBuf[i * 4 + 3] = v.w;
      }
    } else if (hasProperties(data[0], ['x', 'y', 'z'])) {
      if (!this.dataBuf || this.dataBuf.length !== data.length * 3) {
        this.dataBuf = new this.type(data.length * 3);
        this.elementSize = 3;
      }
      for (i = _k = 0, _len2 = data.length; _k < _len2; i = ++_k) {
        v = data[i];
        this.dataBuf[i * 3 + 0] = v.x;
        this.dataBuf[i * 3 + 1] = v.y;
        this.dataBuf[i * 3 + 2] = v.z;
      }
    } else if (hasProperties(data[0], ['x', 'y'])) {
      if (!this.dataBuf || this.dataBuf.length !== data.length * 2) {
        this.dataBuf = new this.type(data.length * 2);
        this.elementSize = 2;
      }
      for (i = _l = 0, _len3 = data.length; _l < _len3; i = ++_l) {
        v = data[i];
        this.dataBuf[i * 2 + 0] = v.x;
        this.dataBuf[i * 2 + 1] = v.y;
      }
    } else if (hasProperties(data[0], ['r', 'g', 'b', 'a'])) {
      if (!this.dataBuf || this.dataBuf.length !== data.length * 4) {
        this.dataBuf = new this.type(data.length * 4);
        this.elementSize = 4;
      }
      for (i = _m = 0, _len4 = data.length; _m < _len4; i = ++_m) {
        v = data[i];
        this.dataBuf[i * 4 + 0] = v.r;
        this.dataBuf[i * 4 + 1] = v.g;
        this.dataBuf[i * 4 + 2] = v.b;
        this.dataBuf[i * 4 + 3] = v.a;
      }
    } else if (data[0].length === 2) {
      if (!this.dataBuf || this.dataBuf.length !== data.length * 2) {
        this.dataBuf = new this.type(data.length * 2);
        this.elementSize = 1;
      }
      for (i = _n = 0, _len5 = data.length; _n < _len5; i = ++_n) {
        e = data[i];
        this.dataBuf[i * 2 + 0] = e[0];
        this.dataBuf[i * 2 + 1] = e[1];
      }
    } else if (data[0].length >= 3) {
      numIndices = 0;
      for (_o = 0, _len6 = data.length; _o < _len6; _o++) {
        face = data[_o];
        if (face.length === 3) {
          numIndices += 3;
        }
        if (face.length === 4) {
          numIndices += 6;
        }
        if (face.length > 4) {
          throw 'FacePolygons ' + face.length + ' + are not supported in RenderableGeometry Buffers';
        }
      }
      if (!this.dataBuf || this.dataBuf.length !== numIndices) {
        this.dataBuf = new this.type(numIndices);
        this.elementSize = 1;
      }
      index = 0;
      for (_p = 0, _len7 = data.length; _p < _len7; _p++) {
        face = data[_p];
        if (face.length === 3) {
          this.dataBuf[index + 0] = face[0];
          this.dataBuf[index + 1] = face[1];
          this.dataBuf[index + 2] = face[2];
          index += 3;
        }
        if (face.length === 4) {
          this.dataBuf[index + 0] = face[0];
          this.dataBuf[index + 1] = face[1];
          this.dataBuf[index + 2] = face[3];
          this.dataBuf[index + 3] = face[3];
          this.dataBuf[index + 4] = face[1];
          this.dataBuf[index + 5] = face[2];
          index += 6;
        }
      }
    } else {
      console.log('Buffer.unknown type', data.name, data[0]);
    }
    this.gl.bindBuffer(this.target, this.handle);
    return this.gl.bufferData(this.target, this.dataBuf, this.usage);
  };

  return Buffer;

})();

module.exports = Buffer;