Added infrastructure to run gpu demos under Pepper3D. Created a Demo class th...

gpu/demos/framework/demo.h

+// Copyright (c) 2010 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 demos.
+
+#ifndef GPU_DEMOS_FRAMEWORK_DEMO_H_
+#define GPU_DEMOS_FRAMEWORK_DEMO_H_
+
+#include "base/time.h"
+
+namespace gpu {
+namespace demos {
+
+// Base class for GLES2 demos. The same demo class is supposed to be run as
+// standalone apps (exe), pepper plugin (dll), and nacl module (nexe). This is
+// accomplished by creating framework for each platfom and hosting the demo
+// class object.
+class Demo {
+ public:
+  Demo();
+  virtual ~Demo();
+
+  // Returns the title of demo. This title is used to name the window or
+  // html page where demo is running.
+  virtual const wchar_t* Title() const = 0;
+
+  // Initializes the size of the window on which this demo object will render.
+  void InitWindowSize(int width, int height);
+
+  // This function is called by the framework to initialize the OpenGL state
+  // required by this demo. When this function is called, it is assumed that
+  // a rendering context has already been created and made current.
+  virtual bool InitGL() = 0;
+
+  // This function is called by the framework to perform OpenGL rendering.
+  // When this function is called, it is assumed that the rendering context
+  // has been made current.
+  void Draw();
+
+ protected:
+  // Returns the width of window.
+  int width() const { return width_; }
+  // Returns the height of window.
+  int height() const { return height_; }
+
+  // The framework calls this function for the derived classes to do custom
+  // rendering. There is no default implementation. It must be defined by the
+  // derived classes. The elapsed_sec param represents the time elapsed
+  // (in seconds) after Render was called the last time. It can be used to
+  // make the application frame-rate independent. It is 0.0f for the
+  // first render call.
+  virtual void Render(float elapsed_sec) = 0;
+
+ private:
+  int width_;  // Window width.
+  int height_;  // Window height.
+
+  // Time at which draw was called last.
+  base::Time last_draw_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(Demo);
+};
+
+}  // namespace demos
+}  // namespace gpu
+#endif  // GPU_DEMOS_FRAMEWORK_DEMO_H_