Resubmit 35500: Added an application framework for demos. Ported hellotriangl...

gpu/demos/app_framework/application.h

+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Base class for gles2 applications using command buffer.
+
+#ifndef GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_
+#define GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_
+
+#include "base/at_exit.h"
+#include "base/message_loop.h"
+
+#include "gpu/demos/app_framework/platform.h"
+
+namespace gpu_demos {
+
+// Acts as a base class for GLES2 applications using command buffer.
+// The derived calls needs to call InitRenderContext() to create a render
+// surface and initialize a rendering context. Currently it only creates
+// an on-screen window. It will be extended to support pepper/nacl plugin
+// when pepper 3D api is in place.
+class Application {
+ public:
+  Application();
+  virtual ~Application();
+
+  // Enters the event processing loop.
+  void MainLoop();
+  void OnPaint();
+
+ protected:
+  // Returns the size of rendering surface.
+  inline int width() const { return width_; }
+  inline int height() const { return height_; }
+
+  bool InitRenderContext();
+
+  virtual void Draw() = 0;
+
+ private:
+  // Creates a native on-screen window.
+  NativeWindowHandle CreateNativeWindow();
+
+  int width_;
+  int height_;
+  NativeWindowHandle window_handle_;
+
+  // The following two variables are just needed to satisfy
+  // the assumption that we are running inside a browser.
+  base::AtExitManager at_exit_manager_;
+  MessageLoopForUI message_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(Application);
+};
+
+}  // namespace gpu_demos
+#endif  // GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_