mirror of
https://github.com/Ryujinx/Opentk.git
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112 lines
4.5 KiB
C#
112 lines
4.5 KiB
C#
// This code was written for the OpenTK library and has been released
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// to the Public Domain.
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// It is provided "as is" without express or implied warranty of any kind.
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using System;
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using System.Runtime.InteropServices;
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using OpenTK;
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using OpenTK.Graphics;
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using OpenTK.Graphics.OpenGL;
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namespace Examples.Tests
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{
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[Example("External Context Test", ExampleCategory.OpenTK, "OpenGL")]
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class ExternalContext
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{
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public static void Main()
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{
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using (Toolkit.Init(new ToolkitOptions { Backend = PlatformBackend.PreferNative }))
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{
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// Create a window and context using a third-party toolkit
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// (in this case SDL2)
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var window = SDL.CreateWindow("Test", 0, 0, 640, 480,
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WindowFlags.AllowHighDpi | WindowFlags.OpenGL);
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var context = SDL.GL.CreateContext(window);
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// The external context must be made current,
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// in order to correctly initialize OpenTK.Graphics
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SDL.GL.MakeCurrent(window, context);
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// Now we need to initialize OpenTK.Graphics using
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// the external context. This can be achieved in
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// two ways:
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//
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// var dummy = new GraphicsContext(ContextHandle.Zero, null);
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// -- or --
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// var dummy = new GraphicsContext(
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// new ContextHandle(context),
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// (name) => SDL.GL.GetAddress(name),
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// () => new ContextHandle(SDL.GL.GetCurrentContext()));
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//
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// The first approach works only on Windows, Mac and Linux/X11.
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//
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// The second approach will work on all platforms supported
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// by the external toolkit. This means that you can use
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// OpenTK.Graphics everywhere, even on platforms not directly
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// supported by OpenTK.
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using (var dummy = new GraphicsContext(
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new ContextHandle(context),
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SDL.GL.GetAddress,
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() => new ContextHandle(SDL.GL.GetCurrentContext())))
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{
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for (int i = 0; i < 100; i++)
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{
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SDL.PumpEvents();
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GL.ClearColor(i / 100.0f, i / 100.0f, i / 100.0f, i / 100.0f);
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GL.Clear(ClearBufferMask.ColorBufferBit);
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SDL.GL.SwapWindow(window);
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}
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SDL.DestroyWindow(window);
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}
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}
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}
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}
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#region SDL2 bindings
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public enum WindowFlags
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{
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Default = 0,
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OpenGL = 0x00000002,
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AllowHighDpi = 0x00002000,
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}
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static class SDL
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{
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const string lib = "SDL2.dll";
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_CreateWindow", ExactSpelling = true)]
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public static extern IntPtr CreateWindow(string title, int x, int y, int w, int h, WindowFlags flags);
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_DestroyWindow", ExactSpelling = true)]
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public static extern void DestroyWindow(IntPtr window);
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_PumpEvents", ExactSpelling = true)]
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public static extern void PumpEvents();
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public static class GL
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{
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_CreateContext", ExactSpelling = true)]
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public static extern IntPtr CreateContext(IntPtr window);
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetCurrentContext", ExactSpelling = true)]
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public static extern IntPtr GetCurrentContext();
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetProcAddress", ExactSpelling = true)]
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public static extern IntPtr GetAddress(string name);
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_MakeCurrent", ExactSpelling = true)]
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public static extern int MakeCurrent(IntPtr window, IntPtr context);
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[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_SwapWindow", ExactSpelling = true)]
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public static extern void SwapWindow(IntPtr window);
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}
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}
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#endregion
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}
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