beginning of matrix class

utils/matrix/float32.dart

Index: utils/matrix/float32.dart
diff --git a/utils/matrix/float32.dart b/utils/matrix/float32.dart
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index 0000000000000000000000000000000000000000..0c54f694248ec2fc75c096b4d3def9d50099a177
--- /dev/null
+++ b/utils/matrix/float32.dart
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+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Emulates the browser's Float32Array (so Matrix4 can be used outside
+ * the browser.
+ * (Note this stores entries as 64-bit doubles, since there is no
+ * 32-bit float type on the vm.)
+ */
+class Float32Array {
+  final List<double> buf;
+
+  Float32Array(int size) : buf = new List<double>(size) {
+    for (int i = 0; i < size; i++) {
+      buf[i] = 0.0;
+    }
+  }
+
+  double operator [](int i) {
+    return buf[i];
+  }
+
+  void operator []=(int i, num value) {
+    buf[i] = (value != null) ? value.toDouble() : 0.0;
+  }
+}