/*************************************************************************/
/*  opengl_context.h                                                     */
/*************************************************************************/
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#ifndef EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_
#define EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_

///
/// @file
/// OpenGLContext manages the OpenGL context in the browser that is associated
/// with a @a pp::Instance instance.
///

#include <pthread.h>

#include <algorithm>
#include <string>

#include "ppapi/c/ppb_opengles2.h"
//#include "ppapi/cpp/dev/context_3d_dev.h"
#include "ppapi/cpp/graphics_3d_client.h"
#include "ppapi/cpp/graphics_3d.h"
//#include "ppapi/cpp/dev/surface_3d_dev.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/size.h"

// A convenience wrapper for a shared OpenGLContext pointer type.  As other
// smart pointer types are needed, add them here.

#include <tr1/memory>

class OpenGLContext;

typedef std::tr1::shared_ptr<OpenGLContext> SharedOpenGLContext;

/// OpenGLContext manages an OpenGL rendering context in the browser.
///
class OpenGLContext : public pp::Graphics3DClient {
 public:
  explicit OpenGLContext(pp::Instance* instance);

  /// Release all the in-browser resources used by this context, and make this
  /// context invalid.
  virtual ~OpenGLContext();

  /// The Graphics3DClient interfcace.
  virtual void Graphics3DContextLost() {
    assert(!"Unexpectedly lost graphics context");
  }

  /// Make @a this the current 3D context in @a instance.
  /// @param instance The instance of the NaCl module that will receive the
  ///                 the current 3D context.
  /// @return success.
  bool MakeContextCurrent(pp::Instance* instance);

  /// Flush the contents of this context to the browser's 3D device.
  void FlushContext();

  /// Make the underlying 3D device invalid, so that any subsequent rendering
  /// commands will have no effect.  The next call to MakeContextCurrent() will
  /// cause the underlying 3D device to get rebound and start receiving
  /// receiving rendering commands again.  Use InvalidateContext(), for
  /// example, when resizing the context's viewing area.
  void InvalidateContext(pp::Instance* instance);

  void ResizeContext(const pp::Size& size);

  /// The OpenGL ES 2.0 interface.
  const struct PPB_OpenGLES2_Dev* gles2() const {
    return gles2_interface_;
  }

  /// The PP_Resource needed to make GLES2 calls through the Pepper interface.
  const PP_Resource gl_context() const {
    return context_.pp_resource();
  }

  /// Indicate whether a flush is pending.  This can only be called from the
  /// main thread; it is not thread safe.
  bool flush_pending() const {
    return flush_pending_;
  }
  void set_flush_pending(bool flag) {
    flush_pending_ = flag;
  }

 private:
  pp::Graphics3D context_;
  bool flush_pending_;

  int width, height;

  pp::Instance* instance;

  const struct PPB_OpenGLES2_Dev* gles2_interface_;
};

#endif  // EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_