heatmap-texture.js

'use strict';

function HeatmapTexture(gl, params) {
  var _ref, _ref1;
  this.gl = gl;
  if (params == null) {
    params = {};
  }
  this.channels = this.gl[((_ref = params.channels) != null ? _ref : 'rgba').toUpperCase()];
  if (typeof params.type === 'number') {
    this.type = params.type;
  } else {
    this.type = this.gl[((_ref1 = params.type) != null ? _ref1 : 'unsigned_byte').toUpperCase()];
  }
  switch (this.channels) {
    case this.gl.RGBA:
      this.chancount = 4;
      break;
    case this.gl.RGB:
      this.chancount = 3;
      break;
    case this.gl.LUMINANCE_ALPHA:
      this.chancount = 2;
      break;
    default:
      this.chancount = 1;
  }
  this.target = this.gl.TEXTURE_2D;
  this.handle = this.gl.createTexture();
}

HeatmapTexture.prototype.destroy = function() {
  return this.gl.deleteTexture(this.handle);
};

HeatmapTexture.prototype.bind = function(unit) {
  if (unit == null) {
    unit = 0;
  }
  if (unit > 15) {
    throw 'Texture unit too large: ' + unit;
  }
  this.gl.activeTexture(this.gl.TEXTURE0 + unit);
  this.gl.bindTexture(this.target, this.handle);
  return this;
};

HeatmapTexture.prototype.setSize = function(width, height) {
  this.width = width;
  this.height = height;
  this.gl.texImage2D(this.target, 0, this.channels, this.width, this.height, 0, this.channels, this.type, null);
  return this;
};

HeatmapTexture.prototype.upload = function(data) {
  this.width = data.width;
  this.height = data.height;
  this.gl.texImage2D(this.target, 0, this.channels, this.channels, this.type, data);
  return this;
};

HeatmapTexture.prototype.linear = function() {
  this.gl.texParameteri(this.target, this.gl.TEXTURE_MAG_FILTER, this.gl.LINEAR);
  this.gl.texParameteri(this.target, this.gl.TEXTURE_MIN_FILTER, this.gl.LINEAR);
  return this;
};

HeatmapTexture.prototype.nearest = function() {
  this.gl.texParameteri(this.target, this.gl.TEXTURE_MAG_FILTER, this.gl.NEAREST);
  this.gl.texParameteri(this.target, this.gl.TEXTURE_MIN_FILTER, this.gl.NEAREST);
  return this;
};

HeatmapTexture.prototype.clampToEdge = function() {
  this.gl.texParameteri(this.target, this.gl.TEXTURE_WRAP_S, this.gl.CLAMP_TO_EDGE);
  this.gl.texParameteri(this.target, this.gl.TEXTURE_WRAP_T, this.gl.CLAMP_TO_EDGE);
  return this;
};

HeatmapTexture.prototype.repeat = function() {
  this.gl.texParameteri(this.target, this.gl.TEXTURE_WRAP_S, this.gl.REPEAT);
  this.gl.texParameteri(this.target, this.gl.TEXTURE_WRAP_T, this.gl.REPEAT);
  return this;
};

module.exports = HeatmapTexture;