diff --git a/clone.js b/clone.js
index e5c7438..1f59c8a 100644
--- a/clone.js
+++ b/clone.js
@@ -1,5 +1,7 @@
 module.exports = clone;
 
+var GLMAT_ARRAY_TYPE = require('./common').GLMAT_ARRAY_TYPE();
+
 /**
  * Creates a new mat4 initialized with values from an existing matrix
  *
@@ -7,7 +9,7 @@ module.exports = clone;
  * @returns {mat4} a new 4x4 matrix
  */
 function clone(a) {
-    var out = new Float32Array(16);
+    var out = new GLMAT_ARRAY_TYPE(16);
     out[0] = a[0];
     out[1] = a[1];
     out[2] = a[2];
diff --git a/common.js b/common.js
new file mode 100644
index 0000000..69fda27
--- /dev/null
+++ b/common.js
@@ -0,0 +1,5 @@
+module.exports = {
+  GLMAT_EPSILON: function() { return 0.000001; },
+  GLMAT_RANDOM: function() { return Math.random; },
+  GLMAT_ARRAY_TYPE: function() { return (typeof Float32Array !== 'undefined') ? Float32Array : Array; }
+};
\ No newline at end of file
diff --git a/create.js b/create.js
index 3aa4ccd..8a76b1e 100644
--- a/create.js
+++ b/create.js
@@ -1,12 +1,14 @@
 module.exports = create;
 
+var GLMAT_ARRAY_TYPE = require('./common').GLMAT_ARRAY_TYPE();
+
 /**
  * Creates a new identity mat4
  *
  * @returns {mat4} a new 4x4 matrix
  */
 function create() {
-    var out = new Float32Array(16);
+    var out = new GLMAT_ARRAY_TYPE(16);
     out[0] = 1;
     out[1] = 0;
     out[2] = 0;
diff --git a/lookAt.js b/lookAt.js
index 117e439..9ca1892 100644
--- a/lookAt.js
+++ b/lookAt.js
@@ -2,6 +2,8 @@ var identity = require('./identity');
 
 module.exports = lookAt;
 
+var GLMAT_EPSILON = require('./common').GLMAT_EPSILON();
+
 /**
  * Generates a look-at matrix with the given eye position, focal point, and up axis
  *
@@ -23,9 +25,9 @@ function lookAt(out, eye, center, up) {
         centery = center[1],
         centerz = center[2];
 
-    if (Math.abs(eyex - centerx) < 0.000001 &&
-        Math.abs(eyey - centery) < 0.000001 &&
-        Math.abs(eyez - centerz) < 0.000001) {
+    if (Math.abs(eyex - centerx) < GLMAT_EPSILON &&
+        Math.abs(eyey - centery) < GLMAT_EPSILON &&
+        Math.abs(eyez - centerz) < GLMAT_EPSILON) {
         return identity(out);
     }
 
diff --git a/rotate.js b/rotate.js
index 418d954..d84a4d2 100644
--- a/rotate.js
+++ b/rotate.js
@@ -1,7 +1,9 @@
 module.exports = rotate;
 
+var GLMAT_EPSILON = require('./common').GLMAT_EPSILON();
+
 /**
- * Rotates a mat4 by the given angle
+ * Rotates a mat4 by the given angle around the given axis
  *
  * @param {mat4} out the receiving matrix
  * @param {mat4} a the matrix to rotate
@@ -20,7 +22,7 @@ function rotate(out, a, rad, axis) {
         b10, b11, b12,
         b20, b21, b22;
 
-    if (Math.abs(len) < 0.000001) { return null; }
+    if (Math.abs(len) < GLMAT_EPSILON) { return null; }
     
     len = 1 / len;
     x *= len;
diff --git a/tools/parser.js b/tools/parser.js
index 7742758..0919454 100644
--- a/tools/parser.js
+++ b/tools/parser.js
@@ -6,10 +6,6 @@ var path = require('path')
 // ^ had to manually remove aliases like 'mul' from the above before parsing
 var orig = fs.readFileSync(__dirname+'/original.js', 'utf8')
 
-//TODO: common module that exports these?
-orig = orig.replace(/GLMAT\_EPSILON/g, '0.000001')
-        .replace(/GLMAT\_ARRAY\_TYPE/g, 'Float32Array')
-        .replace(/GLMAT\_RANDOM/g, 'Math.random')
 
 // var block = /(\/\*[^]*?\*\/)/g
 // var func = /mat4\.([a-z0-9\-\_]+).*\=.*function/ig
@@ -36,6 +32,15 @@ while (match = reg.exec(orig)) {
         var name = lastMatch[2].trim()
         var body = orig.substring( start, end )
         var file = 'module.exports = '+name+';\n\n'
+        if(body.indexOf('GLMAT_ARRAY_TYPE') > -1) {
+            file +=  "var GLMAT_ARRAY_TYPE = require('./common').GLMAT_ARRAY_TYPE();\n\n"
+        };
+        if(body.indexOf('GLMAT_RANDOM') > -1) {
+            file +=  "var GLMAT_RANDOM = require('./common').GLMAT_RANDOM();\n\n"
+        };
+        if(body.indexOf('GLMAT_EPSILON') > -1) {
+            file +=  "var GLMAT_EPSILON = require('./common').GLMAT_EPSILON();\n\n"
+        };
         file += lastMatch[1]+'\nfunction '+name+body.trim() 
 
         var filename = name+'.js'