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Plugin Class

You can get access to the main loop of the Unigine engine by overriding virtual methods of the Unigine.Plugin class. This article describes the sample located in the <UnigineSDK>/source/csharp/samples/Api/Systems/Ffp/ directory.

Notice
In the C# API you can inherit from the Plugin class only once.

See also#

  • An example can be found in the <UnigineSDK>/source/csharp/samples/Api/Systems/Ffp/ directory.
  • C++ API classes Unigine::Plugin and Unigine::Ffp which have the same methods and behavior as in the C# API.

Plugin Class Usage Example#

C# Side#

To use the Unigine.Plugin class, you should create your own class and inherit it from the Unigine.Plugin class and override necessary methods, which the engine will perform in its main loop.

Source code (C#)
using System;
using Unigine;

class UnigineApp
{
	class FfpPlugin : Plugin
	{
		private float time;

		public override void Gui(EngineWindow window)
		{
			time += Engine.IFps;
			Render(time);
		}

		private void Render(float time)
		{
			// screen size
			int width = 0;
			int height = 0;

			EngineWindow main_window = WindowManager.MainWindow;
			if (main_window != null)
			{
				width = main_window.Size.x;
				height = main_window.Size.y;
			}

			float radius = height / 2.0f;

			Ffp.Enable(Ffp.MODE_SOLID);
			Ffp.SetOrtho(width, height);

			// begin triangles
			Ffp.BeginTriangles();

			// vertex colors
			uint[] colors = { 0xffff0000, 0xff00ff00, 0xff0000ff };

			// create vertices
			int num_vertex = 16;
			for (int i = 0; i < num_vertex; i++)
			{
				float angle = MathLib.PI2 * i / (num_vertex - 1) - time;
				float x = width / 2 + (float)Math.Sin(angle) * radius;
				float y = height / 2 + (float)Math.Cos(angle) * radius;
				Ffp.AddVertex(x, y);
				Ffp.SetColor(colors[i % 3]);
			}

			// create indices
			for (int i = 1; i < num_vertex; i++)
			{
				Ffp.AddIndex(0);
				Ffp.AddIndex(i);
				Ffp.AddIndex(i - 1);
			}

			// end triangles
			Ffp.EndTriangles();

			Ffp.Disable();
		}
	}

	class AppSystemLogic : SystemLogic
	{
		public override bool Init()
		{
			Engine.BackgroundUpdate = true;
			Unigine.Console.Run("world_load data/ffp");
			return true;
		}

	}

	class AppWorldLogic : WorldLogic
	{
		FfpPlugin plugin;

		public override bool Init()
		{
			// create plugin
			plugin = new FfpPlugin();
			Engine.AddPlugin(plugin);
            Unigine.Console.Active = true;

            return true;
        }

		public override bool Shutdown()
		{
			// remove plugin
			Engine.RemovePlugin(plugin);

			return true;
		}
	}
}

In this part of the code we create the FfpPlugin class which inherits the Plugin class and override the Gui() method. We specified the Render() method and call it inside the overridden Gui() method. Engine calls this function before Gui each render frame.

In the Main() method, we create an instance of the FfpPlugin class and add it to the engine by using the AddPlugin() method after the engine had been initialized.

Output#

The following result will be shown:

Last update: 2023-02-03
Build: ()