diff --git a/lib/cuon-matrix.js b/lib/cuon-matrix.js
new file mode 100644
index 0000000..b67a5dd
--- /dev/null
+++ b/lib/cuon-matrix.js
@@ -0,0 +1,741 @@
+// cuon-matrix.js (c) 2012 kanda and matsuda
+/** 
+ * This is a class treating 4x4 matrix.
+ * This class contains the function that is equivalent to OpenGL matrix stack.
+ * The matrix after conversion is calculated by multiplying a conversion matrix from the right.
+ * The matrix is replaced by the calculated result.
+ */
+
+/**
+ * Constructor of Matrix4
+ * If opt_src is specified, new matrix is initialized by opt_src.
+ * Otherwise, new matrix is initialized by identity matrix.
+ * @param opt_src source matrix(option)
+ */
+var Matrix4 = function(opt_src) {
+  var i, s, d;
+  if (opt_src && typeof opt_src === 'object' && opt_src.hasOwnProperty('elements')) {
+    s = opt_src.elements;
+    d = new Float32Array(16);
+    for (i = 0; i < 16; ++i) {
+      d[i] = s[i];
+    }
+    this.elements = d;
+  } else {
+    this.elements = new Float32Array([1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1]);
+  }
+};
+
+/**
+ * Set the identity matrix.
+ * @return this
+ */
+Matrix4.prototype.setIdentity = function() {
+  var e = this.elements;
+  e[0] = 1;   e[4] = 0;   e[8]  = 0;   e[12] = 0;
+  e[1] = 0;   e[5] = 1;   e[9]  = 0;   e[13] = 0;
+  e[2] = 0;   e[6] = 0;   e[10] = 1;   e[14] = 0;
+  e[3] = 0;   e[7] = 0;   e[11] = 0;   e[15] = 1;
+  return this;
+};
+
+/**
+ * Copy matrix.
+ * @param src source matrix
+ * @return this
+ */
+Matrix4.prototype.set = function(src) {
+  var i, s, d;
+
+  s = src.elements;
+  d = this.elements;
+
+  if (s === d) {
+    return;
+  }
+    
+  for (i = 0; i < 16; ++i) {
+    d[i] = s[i];
+  }
+
+  return this;
+};
+
+/**
+ * Multiply the matrix from the right.
+ * @param other The multiply matrix
+ * @return this
+ */
+Matrix4.prototype.concat = function(other) {
+  var i, e, a, b, ai0, ai1, ai2, ai3;
+  
+  // Calculate e = a * b
+  e = this.elements;
+  a = this.elements;
+  b = other.elements;
+  
+  // If e equals b, copy b to temporary matrix.
+  if (e === b) {
+    b = new Float32Array(16);
+    for (i = 0; i < 16; ++i) {
+      b[i] = e[i];
+    }
+  }
+  
+  for (i = 0; i < 4; i++) {
+    ai0=a[i];  ai1=a[i+4];  ai2=a[i+8];  ai3=a[i+12];
+    e[i]    = ai0 * b[0]  + ai1 * b[1]  + ai2 * b[2]  + ai3 * b[3];
+    e[i+4]  = ai0 * b[4]  + ai1 * b[5]  + ai2 * b[6]  + ai3 * b[7];
+    e[i+8]  = ai0 * b[8]  + ai1 * b[9]  + ai2 * b[10] + ai3 * b[11];
+    e[i+12] = ai0 * b[12] + ai1 * b[13] + ai2 * b[14] + ai3 * b[15];
+  }
+  
+  return this;
+};
+Matrix4.prototype.multiply = Matrix4.prototype.concat;
+
+/**
+ * Multiply the three-dimensional vector.
+ * @param pos  The multiply vector
+ * @return The result of multiplication(Float32Array)
+ */
+Matrix4.prototype.multiplyVector3 = function(pos) {
+  var e = this.elements;
+  var p = pos.elements;
+  var v = new Vector3();
+  var result = v.elements;
+
+  result[0] = p[0] * e[0] + p[1] * e[4] + p[2] * e[ 8] + e[12];
+  result[1] = p[0] * e[1] + p[1] * e[5] + p[2] * e[ 9] + e[13];
+  result[2] = p[0] * e[2] + p[1] * e[6] + p[2] * e[10] + e[14];
+
+  return v;
+};
+
+/**
+ * Multiply the four-dimensional vector.
+ * @param pos  The multiply vector
+ * @return The result of multiplication(Float32Array)
+ */
+Matrix4.prototype.multiplyVector4 = function(pos) {
+  var e = this.elements;
+  var p = pos.elements;
+  var v = new Vector4();
+  var result = v.elements;
+
+  result[0] = p[0] * e[0] + p[1] * e[4] + p[2] * e[ 8] + p[3] * e[12];
+  result[1] = p[0] * e[1] + p[1] * e[5] + p[2] * e[ 9] + p[3] * e[13];
+  result[2] = p[0] * e[2] + p[1] * e[6] + p[2] * e[10] + p[3] * e[14];
+  result[3] = p[0] * e[3] + p[1] * e[7] + p[2] * e[11] + p[3] * e[15];
+
+  return v;
+};
+
+/**
+ * Transpose the matrix.
+ * @return this
+ */
+Matrix4.prototype.transpose = function() {
+  var e, t;
+
+  e = this.elements;
+
+  t = e[ 1];  e[ 1] = e[ 4];  e[ 4] = t;
+  t = e[ 2];  e[ 2] = e[ 8];  e[ 8] = t;
+  t = e[ 3];  e[ 3] = e[12];  e[12] = t;
+  t = e[ 6];  e[ 6] = e[ 9];  e[ 9] = t;
+  t = e[ 7];  e[ 7] = e[13];  e[13] = t;
+  t = e[11];  e[11] = e[14];  e[14] = t;
+
+  return this;
+};
+
+/**
+ * Calculate the inverse matrix of specified matrix, and set to this.
+ * @param other The source matrix
+ * @return this
+ */
+Matrix4.prototype.setInverseOf = function(other) {
+  var i, s, d, inv, det;
+
+  s = other.elements;
+  d = this.elements;
+  inv = new Float32Array(16);
+
+  inv[0]  =   s[5]*s[10]*s[15] - s[5] *s[11]*s[14] - s[9] *s[6]*s[15]
+            + s[9]*s[7] *s[14] + s[13]*s[6] *s[11] - s[13]*s[7]*s[10];
+  inv[4]  = - s[4]*s[10]*s[15] + s[4] *s[11]*s[14] + s[8] *s[6]*s[15]
+            - s[8]*s[7] *s[14] - s[12]*s[6] *s[11] + s[12]*s[7]*s[10];
+  inv[8]  =   s[4]*s[9] *s[15] - s[4] *s[11]*s[13] - s[8] *s[5]*s[15]
+            + s[8]*s[7] *s[13] + s[12]*s[5] *s[11] - s[12]*s[7]*s[9];
+  inv[12] = - s[4]*s[9] *s[14] + s[4] *s[10]*s[13] + s[8] *s[5]*s[14]
+            - s[8]*s[6] *s[13] - s[12]*s[5] *s[10] + s[12]*s[6]*s[9];
+
+  inv[1]  = - s[1]*s[10]*s[15] + s[1] *s[11]*s[14] + s[9] *s[2]*s[15]
+            - s[9]*s[3] *s[14] - s[13]*s[2] *s[11] + s[13]*s[3]*s[10];
+  inv[5]  =   s[0]*s[10]*s[15] - s[0] *s[11]*s[14] - s[8] *s[2]*s[15]
+            + s[8]*s[3] *s[14] + s[12]*s[2] *s[11] - s[12]*s[3]*s[10];
+  inv[9]  = - s[0]*s[9] *s[15] + s[0] *s[11]*s[13] + s[8] *s[1]*s[15]
+            - s[8]*s[3] *s[13] - s[12]*s[1] *s[11] + s[12]*s[3]*s[9];
+  inv[13] =   s[0]*s[9] *s[14] - s[0] *s[10]*s[13] - s[8] *s[1]*s[14]
+            + s[8]*s[2] *s[13] + s[12]*s[1] *s[10] - s[12]*s[2]*s[9];
+
+  inv[2]  =   s[1]*s[6]*s[15] - s[1] *s[7]*s[14] - s[5] *s[2]*s[15]
+            + s[5]*s[3]*s[14] + s[13]*s[2]*s[7]  - s[13]*s[3]*s[6];
+  inv[6]  = - s[0]*s[6]*s[15] + s[0] *s[7]*s[14] + s[4] *s[2]*s[15]
+            - s[4]*s[3]*s[14] - s[12]*s[2]*s[7]  + s[12]*s[3]*s[6];
+  inv[10] =   s[0]*s[5]*s[15] - s[0] *s[7]*s[13] - s[4] *s[1]*s[15]
+            + s[4]*s[3]*s[13] + s[12]*s[1]*s[7]  - s[12]*s[3]*s[5];
+  inv[14] = - s[0]*s[5]*s[14] + s[0] *s[6]*s[13] + s[4] *s[1]*s[14]
+            - s[4]*s[2]*s[13] - s[12]*s[1]*s[6]  + s[12]*s[2]*s[5];
+
+  inv[3]  = - s[1]*s[6]*s[11] + s[1]*s[7]*s[10] + s[5]*s[2]*s[11]
+            - s[5]*s[3]*s[10] - s[9]*s[2]*s[7]  + s[9]*s[3]*s[6];
+  inv[7]  =   s[0]*s[6]*s[11] - s[0]*s[7]*s[10] - s[4]*s[2]*s[11]
+            + s[4]*s[3]*s[10] + s[8]*s[2]*s[7]  - s[8]*s[3]*s[6];
+  inv[11] = - s[0]*s[5]*s[11] + s[0]*s[7]*s[9]  + s[4]*s[1]*s[11]
+            - s[4]*s[3]*s[9]  - s[8]*s[1]*s[7]  + s[8]*s[3]*s[5];
+  inv[15] =   s[0]*s[5]*s[10] - s[0]*s[6]*s[9]  - s[4]*s[1]*s[10]
+            + s[4]*s[2]*s[9]  + s[8]*s[1]*s[6]  - s[8]*s[2]*s[5];
+
+  det = s[0]*inv[0] + s[1]*inv[4] + s[2]*inv[8] + s[3]*inv[12];
+  if (det === 0) {
+    return this;
+  }
+
+  det = 1 / det;
+  for (i = 0; i < 16; i++) {
+    d[i] = inv[i] * det;
+  }
+
+  return this;
+};
+
+/**
+ * Calculate the inverse matrix of this, and set to this.
+ * @return this
+ */
+Matrix4.prototype.invert = function() {
+  return this.setInverseOf(this);
+};
+
+/**
+ * Set the orthographic projection matrix.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @param far The distances to the farther depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @return this
+ */
+Matrix4.prototype.setOrtho = function(left, right, bottom, top, near, far) {
+  var e, rw, rh, rd;
+
+  if (left === right || bottom === top || near === far) {
+    throw 'null frustum';
+  }
+
+  rw = 1 / (right - left);
+  rh = 1 / (top - bottom);
+  rd = 1 / (far - near);
+
+  e = this.elements;
+
+  e[0]  = 2 * rw;
+  e[1]  = 0;
+  e[2]  = 0;
+  e[3]  = 0;
+
+  e[4]  = 0;
+  e[5]  = 2 * rh;
+  e[6]  = 0;
+  e[7]  = 0;
+
+  e[8]  = 0;
+  e[9]  = 0;
+  e[10] = -2 * rd;
+  e[11] = 0;
+
+  e[12] = -(right + left) * rw;
+  e[13] = -(top + bottom) * rh;
+  e[14] = -(far + near) * rd;
+  e[15] = 1;
+
+  return this;
+};
+
+/**
+ * Multiply the orthographic projection matrix from the right.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @param far The distances to the farther depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @return this
+ */
+Matrix4.prototype.ortho = function(left, right, bottom, top, near, far) {
+  return this.concat(new Matrix4().setOrtho(left, right, bottom, top, near, far));
+};
+
+/**
+ * Set the perspective projection matrix.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.setFrustum = function(left, right, bottom, top, near, far) {
+  var e, rw, rh, rd;
+
+  if (left === right || top === bottom || near === far) {
+    throw 'null frustum';
+  }
+  if (near <= 0) {
+    throw 'near <= 0';
+  }
+  if (far <= 0) {
+    throw 'far <= 0';
+  }
+
+  rw = 1 / (right - left);
+  rh = 1 / (top - bottom);
+  rd = 1 / (far - near);
+
+  e = this.elements;
+
+  e[ 0] = 2 * near * rw;
+  e[ 1] = 0;
+  e[ 2] = 0;
+  e[ 3] = 0;
+
+  e[ 4] = 0;
+  e[ 5] = 2 * near * rh;
+  e[ 6] = 0;
+  e[ 7] = 0;
+
+  e[ 8] = (right + left) * rw;
+  e[ 9] = (top + bottom) * rh;
+  e[10] = -(far + near) * rd;
+  e[11] = -1;
+
+  e[12] = 0;
+  e[13] = 0;
+  e[14] = -2 * near * far * rd;
+  e[15] = 0;
+
+  return this;
+};
+
+/**
+ * Multiply the perspective projection matrix from the right.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.frustum = function(left, right, bottom, top, near, far) {
+  return this.concat(new Matrix4().setFrustum(left, right, bottom, top, near, far));
+};
+
+/**
+ * Set the perspective projection matrix by fovy and aspect.
+ * @param fovy The angle between the upper and lower sides of the frustum.
+ * @param aspect The aspect ratio of the frustum. (width/height)
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.setPerspective = function(fovy, aspect, near, far) {
+  var e, rd, s, ct;
+
+  if (near === far || aspect === 0) {
+    throw 'null frustum';
+  }
+  if (near <= 0) {
+    throw 'near <= 0';
+  }
+  if (far <= 0) {
+    throw 'far <= 0';
+  }
+
+  fovy = Math.PI * fovy / 180 / 2;
+  s = Math.sin(fovy);
+  if (s === 0) {
+    throw 'null frustum';
+  }
+
+  rd = 1 / (far - near);
+  ct = Math.cos(fovy) / s;
+
+  e = this.elements;
+
+  e[0]  = ct / aspect;
+  e[1]  = 0;
+  e[2]  = 0;
+  e[3]  = 0;
+
+  e[4]  = 0;
+  e[5]  = ct;
+  e[6]  = 0;
+  e[7]  = 0;
+
+  e[8]  = 0;
+  e[9]  = 0;
+  e[10] = -(far + near) * rd;
+  e[11] = -1;
+
+  e[12] = 0;
+  e[13] = 0;
+  e[14] = -2 * near * far * rd;
+  e[15] = 0;
+
+  return this;
+};
+
+/**
+ * Multiply the perspective projection matrix from the right.
+ * @param fovy The angle between the upper and lower sides of the frustum.
+ * @param aspect The aspect ratio of the frustum. (width/height)
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.perspective = function(fovy, aspect, near, far) {
+  return this.concat(new Matrix4().setPerspective(fovy, aspect, near, far));
+};
+
+/**
+ * Set the matrix for scaling.
+ * @param x The scale factor along the X axis
+ * @param y The scale factor along the Y axis
+ * @param z The scale factor along the Z axis
+ * @return this
+ */
+Matrix4.prototype.setScale = function(x, y, z) {
+  var e = this.elements;
+  e[0] = x;  e[4] = 0;  e[8]  = 0;  e[12] = 0;
+  e[1] = 0;  e[5] = y;  e[9]  = 0;  e[13] = 0;
+  e[2] = 0;  e[6] = 0;  e[10] = z;  e[14] = 0;
+  e[3] = 0;  e[7] = 0;  e[11] = 0;  e[15] = 1;
+  return this;
+};
+
+/**
+ * Multiply the matrix for scaling from the right.
+ * @param x The scale factor along the X axis
+ * @param y The scale factor along the Y axis
+ * @param z The scale factor along the Z axis
+ * @return this
+ */
+Matrix4.prototype.scale = function(x, y, z) {
+  var e = this.elements;
+  e[0] *= x;  e[4] *= y;  e[8]  *= z;
+  e[1] *= x;  e[5] *= y;  e[9]  *= z;
+  e[2] *= x;  e[6] *= y;  e[10] *= z;
+  e[3] *= x;  e[7] *= y;  e[11] *= z;
+  return this;
+};
+
+/**
+ * Set the matrix for translation.
+ * @param x The X value of a translation.
+ * @param y The Y value of a translation.
+ * @param z The Z value of a translation.
+ * @return this
+ */
+Matrix4.prototype.setTranslate = function(x, y, z) {
+  var e = this.elements;
+  e[0] = 1;  e[4] = 0;  e[8]  = 0;  e[12] = x;
+  e[1] = 0;  e[5] = 1;  e[9]  = 0;  e[13] = y;
+  e[2] = 0;  e[6] = 0;  e[10] = 1;  e[14] = z;
+  e[3] = 0;  e[7] = 0;  e[11] = 0;  e[15] = 1;
+  return this;
+};
+
+/**
+ * Multiply the matrix for translation from the right.
+ * @param x The X value of a translation.
+ * @param y The Y value of a translation.
+ * @param z The Z value of a translation.
+ * @return this
+ */
+Matrix4.prototype.translate = function(x, y, z) {
+  var e = this.elements;
+  e[12] += e[0] * x + e[4] * y + e[8]  * z;
+  e[13] += e[1] * x + e[5] * y + e[9]  * z;
+  e[14] += e[2] * x + e[6] * y + e[10] * z;
+  e[15] += e[3] * x + e[7] * y + e[11] * z;
+  return this;
+};
+
+/**
+ * Set the matrix for rotation.
+ * The vector of rotation axis may not be normalized.
+ * @param angle The angle of rotation (degrees)
+ * @param x The X coordinate of vector of rotation axis.
+ * @param y The Y coordinate of vector of rotation axis.
+ * @param z The Z coordinate of vector of rotation axis.
+ * @return this
+ */
+Matrix4.prototype.setRotate = function(angle, x, y, z) {
+  var e, s, c, len, rlen, nc, xy, yz, zx, xs, ys, zs;
+
+  angle = Math.PI * angle / 180;
+  e = this.elements;
+
+  s = Math.sin(angle);
+  c = Math.cos(angle);
+
+  if (0 !== x && 0 === y && 0 === z) {
+    // Rotation around X axis
+    if (x < 0) {
+      s = -s;
+    }
+    e[0] = 1;  e[4] = 0;  e[ 8] = 0;  e[12] = 0;
+    e[1] = 0;  e[5] = c;  e[ 9] =-s;  e[13] = 0;
+    e[2] = 0;  e[6] = s;  e[10] = c;  e[14] = 0;
+    e[3] = 0;  e[7] = 0;  e[11] = 0;  e[15] = 1;
+  } else if (0 === x && 0 !== y && 0 === z) {
+    // Rotation around Y axis
+    if (y < 0) {
+      s = -s;
+    }
+    e[0] = c;  e[4] = 0;  e[ 8] = s;  e[12] = 0;
+    e[1] = 0;  e[5] = 1;  e[ 9] = 0;  e[13] = 0;
+    e[2] =-s;  e[6] = 0;  e[10] = c;  e[14] = 0;
+    e[3] = 0;  e[7] = 0;  e[11] = 0;  e[15] = 1;
+  } else if (0 === x && 0 === y && 0 !== z) {
+    // Rotation around Z axis
+    if (z < 0) {
+      s = -s;
+    }
+    e[0] = c;  e[4] =-s;  e[ 8] = 0;  e[12] = 0;
+    e[1] = s;  e[5] = c;  e[ 9] = 0;  e[13] = 0;
+    e[2] = 0;  e[6] = 0;  e[10] = 1;  e[14] = 0;
+    e[3] = 0;  e[7] = 0;  e[11] = 0;  e[15] = 1;
+  } else {
+    // Rotation around another axis
+    len = Math.sqrt(x*x + y*y + z*z);
+    if (len !== 1) {
+      rlen = 1 / len;
+      x *= rlen;
+      y *= rlen;
+      z *= rlen;
+    }
+    nc = 1 - c;
+    xy = x * y;
+    yz = y * z;
+    zx = z * x;
+    xs = x * s;
+    ys = y * s;
+    zs = z * s;
+
+    e[ 0] = x*x*nc +  c;
+    e[ 1] = xy *nc + zs;
+    e[ 2] = zx *nc - ys;
+    e[ 3] = 0;
+
+    e[ 4] = xy *nc - zs;
+    e[ 5] = y*y*nc +  c;
+    e[ 6] = yz *nc + xs;
+    e[ 7] = 0;
+
+    e[ 8] = zx *nc + ys;
+    e[ 9] = yz *nc - xs;
+    e[10] = z*z*nc +  c;
+    e[11] = 0;
+
+    e[12] = 0;
+    e[13] = 0;
+    e[14] = 0;
+    e[15] = 1;
+  }
+
+  return this;
+};
+
+/**
+ * Multiply the matrix for rotation from the right.
+ * The vector of rotation axis may not be normalized.
+ * @param angle The angle of rotation (degrees)
+ * @param x The X coordinate of vector of rotation axis.
+ * @param y The Y coordinate of vector of rotation axis.
+ * @param z The Z coordinate of vector of rotation axis.
+ * @return this
+ */
+Matrix4.prototype.rotate = function(angle, x, y, z) {
+  return this.concat(new Matrix4().setRotate(angle, x, y, z));
+};
+
+/**
+ * Set the viewing matrix.
+ * @param eyeX, eyeY, eyeZ The position of the eye point.
+ * @param centerX, centerY, centerZ The position of the reference point.
+ * @param upX, upY, upZ The direction of the up vector.
+ * @return this
+ */
+Matrix4.prototype.setLookAt = function(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ) {
+  var e, fx, fy, fz, rlf, sx, sy, sz, rls, ux, uy, uz;
+
+  fx = centerX - eyeX;
+  fy = centerY - eyeY;
+  fz = centerZ - eyeZ;
+
+  // Normalize f.
+  rlf = 1 / Math.sqrt(fx*fx + fy*fy + fz*fz);
+  fx *= rlf;
+  fy *= rlf;
+  fz *= rlf;
+
+  // Calculate cross product of f and up.
+  sx = fy * upZ - fz * upY;
+  sy = fz * upX - fx * upZ;
+  sz = fx * upY - fy * upX;
+
+  // Normalize s.
+  rls = 1 / Math.sqrt(sx*sx + sy*sy + sz*sz);
+  sx *= rls;
+  sy *= rls;
+  sz *= rls;
+
+  // Calculate cross product of s and f.
+  ux = sy * fz - sz * fy;
+  uy = sz * fx - sx * fz;
+  uz = sx * fy - sy * fx;
+
+  // Set to this.
+  e = this.elements;
+  e[0] = sx;
+  e[1] = ux;
+  e[2] = -fx;
+  e[3] = 0;
+
+  e[4] = sy;
+  e[5] = uy;
+  e[6] = -fy;
+  e[7] = 0;
+
+  e[8] = sz;
+  e[9] = uz;
+  e[10] = -fz;
+  e[11] = 0;
+
+  e[12] = 0;
+  e[13] = 0;
+  e[14] = 0;
+  e[15] = 1;
+
+  // Translate.
+  return this.translate(-eyeX, -eyeY, -eyeZ);
+};
+
+/**
+ * Multiply the viewing matrix from the right.
+ * @param eyeX, eyeY, eyeZ The position of the eye point.
+ * @param centerX, centerY, centerZ The position of the reference point.
+ * @param upX, upY, upZ The direction of the up vector.
+ * @return this
+ */
+Matrix4.prototype.lookAt = function(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ) {
+  return this.concat(new Matrix4().setLookAt(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ));
+};
+
+/**
+ * Multiply the matrix for project vertex to plane from the right.
+ * @param plane The array[A, B, C, D] of the equation of plane "Ax + By + Cz + D = 0".
+ * @param light The array which stored coordinates of the light. if light[3]=0, treated as parallel light.
+ * @return this
+ */
+Matrix4.prototype.dropShadow = function(plane, light) {
+  var mat = new Matrix4();
+  var e = mat.elements;
+
+  var dot = plane[0] * light[0] + plane[1] * light[1] + plane[2] * light[2] + plane[3] * light[3];
+
+  e[ 0] = dot - light[0] * plane[0];
+  e[ 1] =     - light[1] * plane[0];
+  e[ 2] =     - light[2] * plane[0];
+  e[ 3] =     - light[3] * plane[0];
+
+  e[ 4] =     - light[0] * plane[1];
+  e[ 5] = dot - light[1] * plane[1];
+  e[ 6] =     - light[2] * plane[1];
+  e[ 7] =     - light[3] * plane[1];
+
+  e[ 8] =     - light[0] * plane[2];
+  e[ 9] =     - light[1] * plane[2];
+  e[10] = dot - light[2] * plane[2];
+  e[11] =     - light[3] * plane[2];
+
+  e[12] =     - light[0] * plane[3];
+  e[13] =     - light[1] * plane[3];
+  e[14] =     - light[2] * plane[3];
+  e[15] = dot - light[3] * plane[3];
+
+  return this.concat(mat);
+}
+
+/**
+ * Multiply the matrix for project vertex to plane from the right.(Projected by parallel light.)
+ * @param normX, normY, normZ The normal vector of the plane.(Not necessary to be normalized.)
+ * @param planeX, planeY, planeZ The coordinate of arbitrary points on a plane.
+ * @param lightX, lightY, lightZ The vector of the direction of light.(Not necessary to be normalized.)
+ * @return this
+ */
+Matrix4.prototype.dropShadowDirectionally = function(normX, normY, normZ, planeX, planeY, planeZ, lightX, lightY, lightZ) {
+  var a = planeX * normX + planeY * normY + planeZ * normZ;
+  return this.dropShadow([normX, normY, normZ, -a], [lightX, lightY, lightZ, 0]);
+};
+
+/**
+ * Constructor of Vector3
+ * If opt_src is specified, new vector is initialized by opt_src.
+ * @param opt_src source vector(option)
+ */
+var Vector3 = function(opt_src) {
+  var v = new Float32Array(3);
+  if (opt_src && typeof opt_src === 'object') {
+    v[0] = opt_src[0]; v[1] = opt_src[1]; v[2] = opt_src[2];
+  } 
+  this.elements = v;
+}
+
+/**
+  * Normalize.
+  * @return this
+  */
+Vector3.prototype.normalize = function() {
+  var v = this.elements;
+  var c = v[0], d = v[1], e = v[2], g = Math.sqrt(c*c+d*d+e*e);
+  if(g){
+    if(g == 1)
+        return this;
+   } else {
+     v[0] = 0; v[1] = 0; v[2] = 0;
+     return this;
+   }
+   g = 1/g;
+   v[0] = c*g; v[1] = d*g; v[2] = e*g;
+   return this;
+};
+
+/**
+ * Constructor of Vector4
+ * If opt_src is specified, new vector is initialized by opt_src.
+ * @param opt_src source vector(option)
+ */
+var Vector4 = function(opt_src) {
+  var v = new Float32Array(4);
+  if (opt_src && typeof opt_src === 'object') {
+    v[0] = opt_src[0]; v[1] = opt_src[1]; v[2] = opt_src[2]; v[3] = opt_src[3];
+  } 
+  this.elements = v;
+}
diff --git a/lib/cuon-utils.js b/lib/cuon-utils.js
new file mode 100644
index 0000000..471d98c
--- /dev/null
+++ b/lib/cuon-utils.js
@@ -0,0 +1,113 @@
+// cuon-utils.js (c) 2012 kanda and matsuda
+/**
+ * Create a program object and make current
+ * @param gl GL context
+ * @param vshader a vertex shader program (string)
+ * @param fshader a fragment shader program (string)
+ * @return true, if the program object was created and successfully made current 
+ */
+function initShaders(gl, vshader, fshader) {
+  var program = createProgram(gl, vshader, fshader);
+  if (!program) {
+    console.log('Failed to create program');
+    return false;
+  }
+
+  gl.useProgram(program);
+  gl.program = program;
+
+  return true;
+}
+
+/**
+ * Create the linked program object
+ * @param gl GL context
+ * @param vshader a vertex shader program (string)
+ * @param fshader a fragment shader program (string)
+ * @return created program object, or null if the creation has failed
+ */
+function createProgram(gl, vshader, fshader) {
+  // Create shader object
+  var vertexShader = loadShader(gl, gl.VERTEX_SHADER, vshader);
+  var fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fshader);
+  if (!vertexShader || !fragmentShader) {
+    return null;
+  }
+
+  // Create a program object
+  var program = gl.createProgram();
+  if (!program) {
+    return null;
+  }
+
+  // Attach the shader objects
+  gl.attachShader(program, vertexShader);
+  gl.attachShader(program, fragmentShader);
+
+  // Link the program object
+  gl.linkProgram(program);
+
+  // Check the result of linking
+  var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
+  if (!linked) {
+    var error = gl.getProgramInfoLog(program);
+    console.log('Failed to link program: ' + error);
+    gl.deleteProgram(program);
+    gl.deleteShader(fragmentShader);
+    gl.deleteShader(vertexShader);
+    return null;
+  }
+  return program;
+}
+
+/**
+ * Create a shader object
+ * @param gl GL context
+ * @param type the type of the shader object to be created
+ * @param source shader program (string)
+ * @return created shader object, or null if the creation has failed.
+ */
+function loadShader(gl, type, source) {
+  // Create shader object
+  var shader = gl.createShader(type);
+  if (shader == null) {
+    console.log('unable to create shader');
+    return null;
+  }
+
+  // Set the shader program
+  gl.shaderSource(shader, source);
+
+  // Compile the shader
+  gl.compileShader(shader);
+
+  // Check the result of compilation
+  var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
+  if (!compiled) {
+    var error = gl.getShaderInfoLog(shader);
+    console.log('Failed to compile shader: ' + error);
+    gl.deleteShader(shader);
+    return null;
+  }
+
+  return shader;
+}
+
+/** 
+ * Initialize and get the rendering for WebGL
+ * @param canvas <cavnas> element
+ * @param opt_debug flag to initialize the context for debugging
+ * @return the rendering context for WebGL
+ */
+function getWebGLContext(canvas, opt_debug) {
+  // Get the rendering context for WebGL
+  var gl = WebGLUtils.setupWebGL(canvas);
+  if (!gl) return null;
+
+  // if opt_debug is explicitly false, create the context for debugging
+  if (arguments.length < 2 || opt_debug) {
+    gl = WebGLDebugUtils.makeDebugContext(gl);
+  }
+
+  return gl;
+}
diff --git a/lib/webgl-debug.js b/lib/webgl-debug.js
new file mode 100644
index 0000000..8e27d54
--- /dev/null
+++ b/lib/webgl-debug.js
@@ -0,0 +1,677 @@
+//Copyright (c) 2009 The Chromium Authors. All rights reserved.
+//Use of this source code is governed by a BSD-style license that can be
+//found in the LICENSE file.
+
+// Various functions for helping debug WebGL apps.
+
+WebGLDebugUtils = function() {
+
+/**
+ * Wrapped logging function.
+ * @param {string} msg Message to log.
+ */
+var log = function(msg) {
+  if (window.console && window.console.log) {
+    window.console.log(msg);
+  }
+};
+
+/**
+ * Which arguements are enums.
+ * @type {!Object.<number, string>}
+ */
+var glValidEnumContexts = {
+
+  // Generic setters and getters
+
+  'enable': { 0:true },
+  'disable': { 0:true },
+  'getParameter': { 0:true },
+
+  // Rendering
+
+  'drawArrays': { 0:true },
+  'drawElements': { 0:true, 2:true },
+
+  // Shaders
+
+  'createShader': { 0:true },
+  'getShaderParameter': { 1:true },
+  'getProgramParameter': { 1:true },
+
+  // Vertex attributes
+
+  'getVertexAttrib': { 1:true },
+  'vertexAttribPointer': { 2:true },
+
+  // Textures
+
+  'bindTexture': { 0:true },
+  'activeTexture': { 0:true },
+  'getTexParameter': { 0:true, 1:true },
+  'texParameterf': { 0:true, 1:true },
+  'texParameteri': { 0:true, 1:true, 2:true },
+  'texImage2D': { 0:true, 2:true, 6:true, 7:true },
+  'texSubImage2D': { 0:true, 6:true, 7:true },
+  'copyTexImage2D': { 0:true, 2:true },
+  'copyTexSubImage2D': { 0:true },
+  'generateMipmap': { 0:true },
+
+  // Buffer objects
+
+  'bindBuffer': { 0:true },
+  'bufferData': { 0:true, 2:true },
+  'bufferSubData': { 0:true },
+  'getBufferParameter': { 0:true, 1:true },
+
+  // Renderbuffers and framebuffers
+
+  'pixelStorei': { 0:true, 1:true },
+  'readPixels': { 4:true, 5:true },
+  'bindRenderbuffer': { 0:true },
+  'bindFramebuffer': { 0:true },
+  'checkFramebufferStatus': { 0:true },
+  'framebufferRenderbuffer': { 0:true, 1:true, 2:true },
+  'framebufferTexture2D': { 0:true, 1:true, 2:true },
+  'getFramebufferAttachmentParameter': { 0:true, 1:true, 2:true },
+  'getRenderbufferParameter': { 0:true, 1:true },
+  'renderbufferStorage': { 0:true, 1:true },
+
+  // Frame buffer operations (clear, blend, depth test, stencil)
+
+  'clear': { 0:true },
+  'depthFunc': { 0:true },
+  'blendFunc': { 0:true, 1:true },
+  'blendFuncSeparate': { 0:true, 1:true, 2:true, 3:true },
+  'blendEquation': { 0:true },
+  'blendEquationSeparate': { 0:true, 1:true },
+  'stencilFunc': { 0:true },
+  'stencilFuncSeparate': { 0:true, 1:true },
+  'stencilMaskSeparate': { 0:true },
+  'stencilOp': { 0:true, 1:true, 2:true },
+  'stencilOpSeparate': { 0:true, 1:true, 2:true, 3:true },
+
+  // Culling
+
+  'cullFace': { 0:true },
+  'frontFace': { 0:true },
+};
+
+/**
+ * Map of numbers to names.
+ * @type {Object}
+ */
+var glEnums = null;
+
+/**
+ * Initializes this module. Safe to call more than once.
+ * @param {!WebGLRenderingContext} ctx A WebGL context. If
+ *    you have more than one context it doesn't matter which one
+ *    you pass in, it is only used to pull out constants.
+ */
+function init(ctx) {
+  if (glEnums == null) {
+    glEnums = { };
+    for (var propertyName in ctx) {
+      if (typeof ctx[propertyName] == 'number') {
+        glEnums[ctx[propertyName]] = propertyName;
+      }
+    }
+  }
+}
+
+/**
+ * Checks the utils have been initialized.
+ */
+function checkInit() {
+  if (glEnums == null) {
+    throw 'WebGLDebugUtils.init(ctx) not called';
+  }
+}
+
+/**
+ * Returns true or false if value matches any WebGL enum
+ * @param {*} value Value to check if it might be an enum.
+ * @return {boolean} True if value matches one of the WebGL defined enums
+ */
+function mightBeEnum(value) {
+  checkInit();
+  return (glEnums[value] !== undefined);
+}
+
+/**
+ * Gets an string version of an WebGL enum.
+ *
+ * Example:
+ *   var str = WebGLDebugUtil.glEnumToString(ctx.getError());
+ *
+ * @param {number} value Value to return an enum for
+ * @return {string} The string version of the enum.
+ */
+function glEnumToString(value) {
+  checkInit();
+  var name = glEnums[value];
+  return (name !== undefined) ? name :
+      ("*UNKNOWN WebGL ENUM (0x" + value.toString(16) + ")");
+}
+
+/**
+ * Returns the string version of a WebGL argument.
+ * Attempts to convert enum arguments to strings.
+ * @param {string} functionName the name of the WebGL function.
+ * @param {number} argumentIndx the index of the argument.
+ * @param {*} value The value of the argument.
+ * @return {string} The value as a string.
+ */
+function glFunctionArgToString(functionName, argumentIndex, value) {
+  var funcInfo = glValidEnumContexts[functionName];
+  if (funcInfo !== undefined) {
+    if (funcInfo[argumentIndex]) {
+      return glEnumToString(value);
+    }
+  }
+  return value.toString();
+}
+
+/**
+ * Given a WebGL context returns a wrapped context that calls
+ * gl.getError after every command and calls a function if the
+ * result is not gl.NO_ERROR.
+ *
+ * @param {!WebGLRenderingContext} ctx The webgl context to
+ *        wrap.
+ * @param {!function(err, funcName, args): void} opt_onErrorFunc
+ *        The function to call when gl.getError returns an
+ *        error. If not specified the default function calls
+ *        console.log with a message.
+ */
+function makeDebugContext(ctx, opt_onErrorFunc) {
+  init(ctx);
+  opt_onErrorFunc = opt_onErrorFunc || function(err, functionName, args) {
+        // apparently we can't do args.join(",");
+        var argStr = "";
+        for (var ii = 0; ii < args.length; ++ii) {
+          argStr += ((ii == 0) ? '' : ', ') +
+              glFunctionArgToString(functionName, ii, args[ii]);
+        }
+        log("WebGL error "+ glEnumToString(err) + " in "+ functionName +
+            "(" + argStr + ")");
+      };
+
+  // Holds booleans for each GL error so after we get the error ourselves
+  // we can still return it to the client app.
+  var glErrorShadow = { };
+
+  // Makes a function that calls a WebGL function and then calls getError.
+  function makeErrorWrapper(ctx, functionName) {
+    return function() {
+      var result = ctx[functionName].apply(ctx, arguments);
+      var err = ctx.getError();
+      if (err != 0) {
+        glErrorShadow[err] = true;
+        opt_onErrorFunc(err, functionName, arguments);
+      }
+      return result;
+    };
+  }
+
+  // Make a an object that has a copy of every property of the WebGL context
+  // but wraps all functions.
+  var wrapper = {};
+  for (var propertyName in ctx) {
+    if (typeof ctx[propertyName] == 'function') {
+       wrapper[propertyName] = makeErrorWrapper(ctx, propertyName);
+     } else {
+       wrapper[propertyName] = ctx[propertyName];
+     }
+  }
+
+  // Override the getError function with one that returns our saved results.
+  wrapper.getError = function() {
+    for (var err in glErrorShadow) {
+      if (glErrorShadow[err]) {
+        glErrorShadow[err] = false;
+        return err;
+      }
+    }
+    return ctx.NO_ERROR;
+  };
+
+  return wrapper;
+}
+
+function resetToInitialState(ctx) {
+  var numAttribs = ctx.getParameter(ctx.MAX_VERTEX_ATTRIBS);
+  var tmp = ctx.createBuffer();
+  ctx.bindBuffer(ctx.ARRAY_BUFFER, tmp);
+  for (var ii = 0; ii < numAttribs; ++ii) {
+    ctx.disableVertexAttribArray(ii);
+    ctx.vertexAttribPointer(ii, 4, ctx.FLOAT, false, 0, 0);
+    ctx.vertexAttrib1f(ii, 0);
+  }
+  ctx.deleteBuffer(tmp);
+
+  var numTextureUnits = ctx.getParameter(ctx.MAX_TEXTURE_IMAGE_UNITS);
+  for (var ii = 0; ii < numTextureUnits; ++ii) {
+    ctx.activeTexture(ctx.TEXTURE0 + ii);
+    ctx.bindTexture(ctx.TEXTURE_CUBE_MAP, null);
+    ctx.bindTexture(ctx.TEXTURE_2D, null);
+  }
+
+  ctx.activeTexture(ctx.TEXTURE0);
+  ctx.useProgram(null);
+  ctx.bindBuffer(ctx.ARRAY_BUFFER, null);
+  ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, null);
+  ctx.bindFramebuffer(ctx.FRAMEBUFFER, null);
+  ctx.bindRenderbuffer(ctx.RENDERBUFFER, null);
+  ctx.disable(ctx.BLEND);
+  ctx.disable(ctx.CULL_FACE);
+  ctx.disable(ctx.DEPTH_TEST);
+  ctx.disable(ctx.DITHER);
+  ctx.disable(ctx.SCISSOR_TEST);
+  ctx.blendColor(0, 0, 0, 0);
+  ctx.blendEquation(ctx.FUNC_ADD);
+  ctx.blendFunc(ctx.ONE, ctx.ZERO);
+  ctx.clearColor(0, 0, 0, 0);
+  ctx.clearDepth(1);
+  ctx.clearStencil(-1);
+  ctx.colorMask(true, true, true, true);
+  ctx.cullFace(ctx.BACK);
+  ctx.depthFunc(ctx.LESS);
+  ctx.depthMask(true);
+  ctx.depthRange(0, 1);
+  ctx.frontFace(ctx.CCW);
+  ctx.hint(ctx.GENERATE_MIPMAP_HINT, ctx.DONT_CARE);
+  ctx.lineWidth(1);
+  ctx.pixelStorei(ctx.PACK_ALIGNMENT, 4);
+  ctx.pixelStorei(ctx.UNPACK_ALIGNMENT, 4);
+  ctx.pixelStorei(ctx.UNPACK_FLIP_Y_WEBGL, false);
+  ctx.pixelStorei(ctx.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
+  // TODO: Delete this IF.
+  if (ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL) {
+    ctx.pixelStorei(ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL, ctx.BROWSER_DEFAULT_WEBGL);
+  }
+  ctx.polygonOffset(0, 0);
+  ctx.sampleCoverage(1, false);
+  ctx.scissor(0, 0, ctx.canvas.width, ctx.canvas.height);
+  ctx.stencilFunc(ctx.ALWAYS, 0, 0xFFFFFFFF);
+  ctx.stencilMask(0xFFFFFFFF);
+  ctx.stencilOp(ctx.KEEP, ctx.KEEP, ctx.KEEP);
+  ctx.viewport(0, 0, ctx.canvas.clientWidth, ctx.canvas.clientHeight);
+  ctx.clear(ctx.COLOR_BUFFER_BIT | ctx.DEPTH_BUFFER_BIT | ctx.STENCIL_BUFFER_BIT);
+
+  // TODO: This should NOT be needed but Firefox fails with 'hint'
+  while(ctx.getError());
+}
+
+function makeLostContextSimulatingContext(ctx) {
+  var wrapper_ = {};
+  var contextId_ = 1;
+  var contextLost_ = false;
+  var resourceId_ = 0;
+  var resourceDb_ = [];
+  var onLost_ = undefined;
+  var onRestored_ = undefined;
+  var nextOnRestored_ = undefined;
+
+  // Holds booleans for each GL error so can simulate errors.
+  var glErrorShadow_ = { };
+
+  function isWebGLObject(obj) {
+    //return false;
+    return (obj instanceof WebGLBuffer ||
+            obj instanceof WebGLFramebuffer ||
+            obj instanceof WebGLProgram ||
+            obj instanceof WebGLRenderbuffer ||
+            obj instanceof WebGLShader ||
+            obj instanceof WebGLTexture);
+  }
+
+  function checkResources(args) {
+    for (var ii = 0; ii < args.length; ++ii) {
+      var arg = args[ii];
+      if (isWebGLObject(arg)) {
+        return arg.__webglDebugContextLostId__ == contextId_;
+      }
+    }
+    return true;
+  }
+
+  function clearErrors() {
+    var k = Object.keys(glErrorShadow_);
+    for (var ii = 0; ii < k.length; ++ii) {
+      delete glErrorShdow_[k];
+    }
+  }
+
+  // Makes a function that simulates WebGL when out of context.
+  function makeLostContextWrapper(ctx, functionName) {
+    var f = ctx[functionName];
+    return function() {
+      // Only call the functions if the context is not lost.
+      if (!contextLost_) {
+        if (!checkResources(arguments)) {
+          glErrorShadow_[ctx.INVALID_OPERATION] = true;
+          return;
+        }
+        var result = f.apply(ctx, arguments);
+        return result;
+      }
+    };
+  }
+
+  for (var propertyName in ctx) {
+    if (typeof ctx[propertyName] == 'function') {
+       wrapper_[propertyName] = makeLostContextWrapper(ctx, propertyName);
+     } else {
+       wrapper_[propertyName] = ctx[propertyName];
+     }
+  }
+
+  function makeWebGLContextEvent(statusMessage) {
+    return {statusMessage: statusMessage};
+  }
+
+  function freeResources() {
+    for (var ii = 0; ii < resourceDb_.length; ++ii) {
+      var resource = resourceDb_[ii];
+      if (resource instanceof WebGLBuffer) {
+        ctx.deleteBuffer(resource);
+      } else if (resource instanceof WebctxFramebuffer) {
+        ctx.deleteFramebuffer(resource);
+      } else if (resource instanceof WebctxProgram) {
+        ctx.deleteProgram(resource);
+      } else if (resource instanceof WebctxRenderbuffer) {
+        ctx.deleteRenderbuffer(resource);
+      } else if (resource instanceof WebctxShader) {
+        ctx.deleteShader(resource);
+      } else if (resource instanceof WebctxTexture) {
+        ctx.deleteTexture(resource);
+      }
+    }
+  }
+
+  wrapper_.loseContext = function() {
+    if (!contextLost_) {
+      contextLost_ = true;
+      ++contextId_;
+      while (ctx.getError());
+      clearErrors();
+      glErrorShadow_[ctx.CONTEXT_LOST_WEBGL] = true;
+      setTimeout(function() {
+          if (onLost_) {
+            onLost_(makeWebGLContextEvent("context lost"));
+          }
+        }, 0);
+    }
+  };
+
+  wrapper_.restoreContext = function() {
+    if (contextLost_) {
+      if (onRestored_) {
+        setTimeout(function() {
+            freeResources();
+            resetToInitialState(ctx);
+            contextLost_ = false;
+            if (onRestored_) {
+              var callback = onRestored_;
+              onRestored_ = nextOnRestored_;
+              nextOnRestored_ = undefined;
+              callback(makeWebGLContextEvent("context restored"));
+            }
+          }, 0);
+      } else {
+        throw "You can not restore the context without a listener"
+      }
+    }
+  };
+
+  // Wrap a few functions specially.
+  wrapper_.getError = function() {
+    if (!contextLost_) {
+      var err;
+      while (err = ctx.getError()) {
+        glErrorShadow_[err] = true;
+      }
+    }
+    for (var err in glErrorShadow_) {
+      if (glErrorShadow_[err]) {
+        delete glErrorShadow_[err];
+        return err;
+      }
+    }
+    return ctx.NO_ERROR;
+  };
+
+  var creationFunctions = [
+    "createBuffer",
+    "createFramebuffer",
+    "createProgram",
+    "createRenderbuffer",
+    "createShader",
+    "createTexture"
+  ];
+  for (var ii = 0; ii < creationFunctions.length; ++ii) {
+    var functionName = creationFunctions[ii];
+    wrapper_[functionName] = function(f) {
+      return function() {
+        if (contextLost_) {
+          return null;
+        }
+        var obj = f.apply(ctx, arguments);
+        obj.__webglDebugContextLostId__ = contextId_;
+        resourceDb_.push(obj);
+        return obj;
+      };
+    }(ctx[functionName]);
+  }
+
+  var functionsThatShouldReturnNull = [
+    "getActiveAttrib",
+    "getActiveUniform",
+    "getBufferParameter",
+    "getContextAttributes",
+    "getAttachedShaders",
+    "getFramebufferAttachmentParameter",
+    "getParameter",
+    "getProgramParameter",
+    "getProgramInfoLog",
+    "getRenderbufferParameter",
+    "getShaderParameter",
+    "getShaderInfoLog",
+    "getShaderSource",
+    "getTexParameter",
+    "getUniform",
+    "getUniformLocation",
+    "getVertexAttrib"
+  ];
+  for (var ii = 0; ii < functionsThatShouldReturnNull.length; ++ii) {
+    var functionName = functionsThatShouldReturnNull[ii];
+    wrapper_[functionName] = function(f) {
+      return function() {
+        if (contextLost_) {
+          return null;
+        }
+        return f.apply(ctx, arguments);
+      }
+    }(wrapper_[functionName]);
+  }
+
+  var isFunctions = [
+    "isBuffer",
+    "isEnabled",
+    "isFramebuffer",
+    "isProgram",
+    "isRenderbuffer",
+    "isShader",
+    "isTexture"
+  ];
+  for (var ii = 0; ii < isFunctions.length; ++ii) {
+    var functionName = isFunctions[ii];
+    wrapper_[functionName] = function(f) {
+      return function() {
+        if (contextLost_) {
+          return false;
+        }
+        return f.apply(ctx, arguments);
+      }
+    }(wrapper_[functionName]);
+  }
+
+  wrapper_.checkFramebufferStatus = function(f) {
+    return function() {
+      if (contextLost_) {
+        return ctx.FRAMEBUFFER_UNSUPPORTED;
+      }
+      return f.apply(ctx, arguments);
+    };
+  }(wrapper_.checkFramebufferStatus);
+
+  wrapper_.getAttribLocation = function(f) {
+    return function() {
+      if (contextLost_) {
+        return -1;
+      }
+      return f.apply(ctx, arguments);
+    };
+  }(wrapper_.getAttribLocation);
+
+  wrapper_.getVertexAttribOffset = function(f) {
+    return function() {
+      if (contextLost_) {
+        return 0;
+      }
+      return f.apply(ctx, arguments);
+    };
+  }(wrapper_.getVertexAttribOffset);
+
+  wrapper_.isContextLost = function() {
+    return contextLost_;
+  };
+
+  function wrapEvent(listener) {
+    if (typeof(listener) == "function") {
+      return listener;
+    } else {
+      return function(info) {
+        listener.handleEvent(info);
+      }
+    }
+  }
+
+  wrapper_.registerOnContextLostListener = function(listener) {
+    onLost_ = wrapEvent(listener);
+  };
+
+  wrapper_.registerOnContextRestoredListener = function(listener) {
+    if (contextLost_) {
+      nextOnRestored_ = wrapEvent(listener);
+    } else {
+      onRestored_ = wrapEvent(listener);
+    }
+  }
+
+  return wrapper_;
+}
+
+return {
+  /**
+   * Initializes this module. Safe to call more than once.
+   * @param {!WebGLRenderingContext} ctx A WebGL context. If
+   *    you have more than one context it doesn't matter which one
+   *    you pass in, it is only used to pull out constants.
+   */
+  'init': init,
+
+  /**
+   * Returns true or false if value matches any WebGL enum
+   * @param {*} value Value to check if it might be an enum.
+   * @return {boolean} True if value matches one of the WebGL defined enums
+   */
+  'mightBeEnum': mightBeEnum,
+
+  /**
+   * Gets an string version of an WebGL enum.
+   *
+   * Example:
+   *   WebGLDebugUtil.init(ctx);
+   *   var str = WebGLDebugUtil.glEnumToString(ctx.getError());
+   *
+   * @param {number} value Value to return an enum for
+   * @return {string} The string version of the enum.
+   */
+  'glEnumToString': glEnumToString,
+
+  /**
+   * Converts the argument of a WebGL function to a string.
+   * Attempts to convert enum arguments to strings.
+   *
+   * Example:
+   *   WebGLDebugUtil.init(ctx);
+   *   var str = WebGLDebugUtil.glFunctionArgToString('bindTexture', 0, gl.TEXTURE_2D);
+   *
+   * would return 'TEXTURE_2D'
+   *
+   * @param {string} functionName the name of the WebGL function.
+   * @param {number} argumentIndx the index of the argument.
+   * @param {*} value The value of the argument.
+   * @return {string} The value as a string.
+   */
+  'glFunctionArgToString': glFunctionArgToString,
+
+  /**
+   * Given a WebGL context returns a wrapped context that calls
+   * gl.getError after every command and calls a function if the
+   * result is not NO_ERROR.
+   *
+   * You can supply your own function if you want. For example, if you'd like
+   * an exception thrown on any GL error you could do this
+   *
+   *    function throwOnGLError(err, funcName, args) {
+   *      throw WebGLDebugUtils.glEnumToString(err) + " was caused by call to" +
+   *            funcName;
+   *    };
+   *
+   *    ctx = WebGLDebugUtils.makeDebugContext(
+   *        canvas.getContext("webgl"), throwOnGLError);
+   *
+   * @param {!WebGLRenderingContext} ctx The webgl context to wrap.
+   * @param {!function(err, funcName, args): void} opt_onErrorFunc The function
+   *     to call when gl.getError returns an error. If not specified the default
+   *     function calls console.log with a message.
+   */
+  'makeDebugContext': makeDebugContext,
+
+  /**
+   * Given a WebGL context returns a wrapped context that adds 4
+   * functions.
+   *
+   * ctx.loseContext:
+   *   simulates a lost context event.
+   *
+   * ctx.restoreContext:
+   *   simulates the context being restored.
+   *
+   * ctx.registerOnContextLostListener(listener):
+   *   lets you register a listener for context lost. Use instead
+   *   of addEventListener('webglcontextlostevent', listener);
+   *
+   * ctx.registerOnContextRestoredListener(listener):
+   *   lets you register a listener for context restored. Use
+   *   instead of addEventListener('webglcontextrestored',
+   *   listener);
+   *
+   * @param {!WebGLRenderingContext} ctx The webgl context to wrap.
+   */
+  'makeLostContextSimulatingContext': makeLostContextSimulatingContext,
+
+  /**
+   * Resets a context to the initial state.
+   * @param {!WebGLRenderingContext} ctx The webgl context to
+   *     reset.
+   */
+  'resetToInitialState': resetToInitialState
+};
+
+}();
+
diff --git a/lib/webgl-utils.js b/lib/webgl-utils.js
new file mode 100644
index 0000000..7a6b546
--- /dev/null
+++ b/lib/webgl-utils.js
@@ -0,0 +1,197 @@
+/*
+ * Copyright 2010, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/**
+ * @fileoverview This file contains functions every webgl program will need
+ * a version of one way or another.
+ *
+ * Instead of setting up a context manually it is recommended to
+ * use. This will check for success or failure. On failure it
+ * will attempt to present an approriate message to the user.
+ *
+ *       gl = WebGLUtils.setupWebGL(canvas);
+ *
+ * For animated WebGL apps use of setTimeout or setInterval are
+ * discouraged. It is recommended you structure your rendering
+ * loop like this.
+ *
+ *       function render() {
+ *         window.requestAnimationFrame(render, canvas);
+ *
+ *         // do rendering
+ *         ...
+ *       }
+ *       render();
+ *
+ * This will call your rendering function up to the refresh rate
+ * of your display but will stop rendering if your app is not
+ * visible.
+ */
+
+WebGLUtils = function() {
+
+/**
+ * Creates the HTLM for a failure message
+ * @param {string} canvasContainerId id of container of th
+ *        canvas.
+ * @return {string} The html.
+ */
+var makeFailHTML = function(msg) {
+  return '' +
+        '<div style="margin: auto; width:500px;z-index:10000;margin-top:20em;text-align:center;">' + msg + '</div>';
+  return '' +
+    '<table style="background-color: #8CE; width: 100%; height: 100%;"><tr>' +
+    '<td align="center">' +
+    '<div style="display: table-cell; vertical-align: middle;">' +
+    '<div style="">' + msg + '</div>' +
+    '</div>' +
+    '</td></tr></table>';
+};
+
+/**
+ * Mesasge for getting a webgl browser
+ * @type {string}
+ */
+var GET_A_WEBGL_BROWSER = '' +
+  'This page requires a browser that supports WebGL.<br/>' +
+  '<a href="http://get.webgl.org">Click here to upgrade your browser.</a>';
+
+/**
+ * Mesasge for need better hardware
+ * @type {string}
+ */
+var OTHER_PROBLEM = '' +
+  "It doesn't appear your computer can support WebGL.<br/>" +
+  '<a href="http://get.webgl.org">Click here for more information.</a>';
+
+/**
+ * Creates a webgl context. If creation fails it will
+ * change the contents of the container of the <canvas>
+ * tag to an error message with the correct links for WebGL.
+ * @param {Element} canvas. The canvas element to create a
+ *     context from.
+ * @param {WebGLContextCreationAttirbutes} opt_attribs Any
+ *     creation attributes you want to pass in.
+ * @param {function:(msg)} opt_onError An function to call
+ *     if there is an error during creation.
+ * @return {WebGLRenderingContext} The created context.
+ */
+var setupWebGL = function(canvas, opt_attribs, opt_onError) {
+  function handleCreationError(msg) {
+      var container = document.getElementsByTagName("body")[0];
+    //var container = canvas.parentNode;
+    if (container) {
+      var str = window.WebGLRenderingContext ?
+           OTHER_PROBLEM :
+           GET_A_WEBGL_BROWSER;
+      if (msg) {
+        str += "<br/><br/>Status: " + msg;
+      }
+      container.innerHTML = makeFailHTML(str);
+    }
+  };
+
+  opt_onError = opt_onError || handleCreationError;
+
+  if (canvas.addEventListener) {
+    canvas.addEventListener("webglcontextcreationerror", function(event) {
+          opt_onError(event.statusMessage);
+        }, false);
+  }
+  var context = create3DContext(canvas, opt_attribs);
+  if (!context) {
+    if (!window.WebGLRenderingContext) {
+      opt_onError("");
+    } else {
+      opt_onError("");
+    }
+  }
+
+  return context;
+};
+
+/**
+ * Creates a webgl context.
+ * @param {!Canvas} canvas The canvas tag to get context
+ *     from. If one is not passed in one will be created.
+ * @return {!WebGLContext} The created context.
+ */
+var create3DContext = function(canvas, opt_attribs) {
+  var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
+  var context = null;
+  for (var ii = 0; ii < names.length; ++ii) {
+    try {
+      context = canvas.getContext(names[ii], opt_attribs);
+    } catch(e) {}
+    if (context) {
+      break;
+    }
+  }
+  return context;
+}
+
+return {
+  create3DContext: create3DContext,
+  setupWebGL: setupWebGL
+};
+}();
+
+/**
+ * Provides requestAnimationFrame in a cross browser
+ * way.
+ */
+if (!window.requestAnimationFrame) {
+  window.requestAnimationFrame = (function() {
+    return window.requestAnimationFrame ||
+           window.webkitRequestAnimationFrame ||
+           window.mozRequestAnimationFrame ||
+           window.oRequestAnimationFrame ||
+           window.msRequestAnimationFrame ||
+           function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
+             window.setTimeout(callback, 1000/60);
+           };
+  })();
+}
+
+/** * ERRATA: 'cancelRequestAnimationFrame' renamed to 'cancelAnimationFrame' to reflect an update to the W3C Animation-Timing Spec. 
+ * 
+ * Cancels an animation frame request. 
+ * Checks for cross-browser support, falls back to clearTimeout. 
+ * @param {number}  Animation frame request. */
+if (!window.cancelAnimationFrame) {
+  window.cancelAnimationFrame = (window.cancelRequestAnimationFrame ||
+                                 window.webkitCancelAnimationFrame || window.webkitCancelRequestAnimationFrame ||
+                                 window.mozCancelAnimationFrame || window.mozCancelRequestAnimationFrame ||
+                                 window.msCancelAnimationFrame || window.msCancelRequestAnimationFrame ||
+                                 window.oCancelAnimationFrame || window.oCancelRequestAnimationFrame ||
+                                 window.clearTimeout);
+}
\ No newline at end of file