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+/*
+ * Copyright 2009, 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.
+ */
+
+
+// This file contains the declaration of the Perlin noise generator.
+
+#ifndef O3D_COMMAND_BUFFER_SAMPLES_BUBBLE_PERLIN_NOISE_H_
+#define O3D_COMMAND_BUFFER_SAMPLES_BUBBLE_PERLIN_NOISE_H_
+
+#include <utility>
+#include "base/scoped_ptr.h"
+
+namespace o3d {
+namespace command_buffer {
+
+// 2D Perlin perlin noise generator.
+class PerlinNoise2D {
+ public:
+  typedef std::pair<float, float> Float2;
+  explicit PerlinNoise2D(unsigned int frequency);
+
+  // Initializes the permutation and gradients arrays. Note that all randomness
+  // happens here.
+  // Parameters:
+  //   seed: pointer to the seed value for randomness. Note: this value is
+  //     modified like it would in the rand_r function.
+  void Initialize(unsigned int *seed);
+
+  // Generates the noise texture.
+  // Parameters:
+  //   width: the width of the texture
+  //   height: the height of the texture
+  //   texture: the texture values, to be filled by the function. The buffer
+  //     must have enough storage for width*height floats.
+  void Generate(unsigned int width, unsigned int height, float *texture);
+
+ private:
+  unsigned int frequency_;
+  scoped_array<unsigned int> permutation_;
+  scoped_array<Float2> gradients_;
+};
+
+}  // namespace command_buffer
+}  // namespace o3d
+
+#endif  // O3D_COMMAND_BUFFER_SAMPLES_BUBBLE_PERLIN_NOISE_H_