framebuffer.js

'use strict';

function Framebuffer(gl) {
  this.gl = gl;
  this.buffer = this.gl.createFramebuffer();
}

Framebuffer.prototype.destroy = function() {
  return this.gl.deleteFRamebuffer(this.buffer);
};

Framebuffer.prototype.bind = function() {
  this.gl.bindFramebuffer(this.gl.FRAMEBUFFER, this.buffer);
  return this;
};

Framebuffer.prototype.unbind = function() {
  this.gl.bindFramebuffer(this.gl.FRAMEBUFFER, null);
  return this;
};

Framebuffer.prototype.check = function() {
  var result;
  result = this.gl.checkFramebufferStatus(this.gl.FRAMEBUFFER);
  switch (result) {
    case this.gl.FRAMEBUFFER_UNSUPPORTED:
      throw 'Framebuffer is unsupported';
      break;
    case this.gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
      throw 'Framebuffer incomplete attachment';
      break;
    case this.gl.FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
      throw 'Framebuffer incomplete dimensions';
      break;
    case this.gl.FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
      throw 'Framebuffer incomplete missing attachment';
  }
  return this;
};

Framebuffer.prototype.color = function(texture) {
  this.gl.framebufferTexture2D(this.gl.FRAMEBUFFER, this.gl.COLOR_ATTACHMENT0, texture.target, texture.handle, 0);
  this.check();
  return this;
};

Framebuffer.prototype.depth = function(buffer) {
  this.gl.framebufferRenderbuffer(this.gl.FRAMEBUFFER, this.gl.DEPTH_ATTACHMENT, this.gl.RENDERBUFFER, buffer.id);
  this.check();
  return this;
};

Framebuffer.prototype.destroy = function() {
  return this.gl.deleteFramebuffer(this.buffer);
};

module.exports = Framebuffer;