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+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_CUBE_H_
+#define EXAMPLES_TUMBLER_CUBE_H_
+
+#include <GLES2/gl2.h>
+#include <vector>
+#include "examples/tumbler/opengl_context.h"
+#include "examples/tumbler/opengl_context_ptrs.h"
+
+namespace tumbler {
+
+// The Cube class provides a place to implement 3D rendering.  It has a
+// frame that it occupies in a browser window.
+class Cube {
+ public:
+  explicit Cube(SharedOpenGLContext opengl_context);
+  ~Cube();
+
+  // Called once when a new RenderContext is first bound to the view.  The
+  // bound context is guaranteed to be current and valid before calling this
+  // method.
+  void PrepareOpenGL();
+
+  // Called whenever the size of the browser view changes.  This method is
+  // called at least once when the view is first made visible.  Clamps the
+  // sizes to 1.
+  void Resize(int width, int height);
+
+  // Called every time the view need to be drawn.  The bound context is
+  // guaranteed to be current and valid before this method is called.  The
+  // visible portion of the context is flushed to the browser after this
+  // method returns.
+  void Draw();
+
+  // Accessor for width and height.  To change these, call Resize.
+  const int width() const {
+    return width_;
+  }
+
+  const int height() const {
+    return height_;
+  }
+
+  // Accessor/mutator for the camera orientation.
+  void GetOrientation(std::vector<float>* orientation) const {
+    if (!orientation)
+      return;
+    (*orientation)[0] = static_cast<float>(orientation_[0]);
+    (*orientation)[1] = static_cast<float>(orientation_[1]);
+    (*orientation)[2] = static_cast<float>(orientation_[2]);
+    (*orientation)[3] = static_cast<float>(orientation_[3]);
+  }
+  void SetOrientation(const std::vector<float>& orientation) {
+    orientation_[0] = static_cast<GLfloat>(orientation[0]);
+    orientation_[1] = static_cast<GLfloat>(orientation[1]);
+    orientation_[2] = static_cast<GLfloat>(orientation[2]);
+    orientation_[3] = static_cast<GLfloat>(orientation[3]);
+  }
+
+ private:
+  // Create the shaders used to draw the cube, and link them into a program.
+  // Initializes |shader_progam_object_|, |position_loction_| and
+  // |mvp_location_|.
+  bool CreateShaders();
+
+  // Generates a cube as a series of GL_TRIANGLE_STRIPs, and initializes
+  // |index_count_| to the number of indices in the index list used as a VBO.
+  // Creates the |vbo_ids_| required for the vertex and index data and uploads
+  // the the VBO data.
+  void CreateCube();
+
+  // Build up the model-view transform from the eye and orienation properties.
+  // Assumes that |model_view| is a 4x4 matrix.
+  void ComputeModelViewTransform(GLfloat* model_view);
+
+  SharedOpenGLContext opengl_context_;
+  int width_;
+  int height_;
+  GLuint shader_program_object_;  // The compiled shaders.
+  GLint position_location_;  // The position attribute location.
+  GLint color_location_;  // The color attribute location.
+  GLint mvp_location_;  // The Model-View-Projection composite matrix.
+  GLuint cube_vbos_[3];
+  GLfloat eye_[3];  // The eye point of the virtual camera.
+  // The orientation of the virtual camera stored as a quaternion.  The
+  // quaternion is laid out as {{x, y, z}, w}.
+  GLfloat orientation_[4];
+  GLfloat perspective_proj_[16];
+  GLfloat mvp_matrix_[16];
+};
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_CUBE_H_