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[Examples] Improved ExternalContext test

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Also added documentation
This commit is contained in:
thefiddler 2014-04-02 13:16:45 +02:00
parent 03a8a6da0e
commit 66e78ad3f6
1 changed files with 52 additions and 22 deletions
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74
Source/Examples/OpenTK/Test/ExternalContext.cs
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@ -17,22 +17,49 @@ namespace Examples.Tests
{ {
using (Toolkit.Init(new ToolkitOptions { Backend = PlatformBackend.PreferNative })) using (Toolkit.Init(new ToolkitOptions { Backend = PlatformBackend.PreferNative }))
{ {
var window = Sdl2.CreateWindow("Test", 0, 0, 640, 480, WindowFlags.AllowHighDpi | WindowFlags.OpenGL); // Create a window and context using a third-party toolkit
var context = Sdl2.CreateContext(window); // (in this case SDL2)
Sdl2.MakeCurrent(window, context); var window = SDL.CreateWindow("Test", 0, 0, 640, 480,
WindowFlags.AllowHighDpi | WindowFlags.OpenGL);
var context = SDL.GL.CreateContext(window);
using (var dummy = new GraphicsContext(new ContextHandle(context), OpenTK.Platform.Utilities.CreateDummyWindowInfo())) // The external context must be made current,
// in order to correctly initialize OpenTK.Graphics
SDL.GL.MakeCurrent(window, context);
// Now we need to initialize OpenTK.Graphics using
// the external context. This can be achieved in
// two ways:
//
// var dummy = new GraphicsContext(ContextHandle.Zero, null);
// -- or --
// var dummy = new GraphicsContext(
// new ContextHandle(context),
// (name) => SDL.GL.GetAddress(name),
// () => new ContextHandle(SDL.GL.GetCurrentContext()));
//
// The first approach works only on Windows, Mac and Linux/X11.
//
// The second approach will work on all platforms supported
// by the external toolkit. This means that you can use
// OpenTK.Graphics everywhere, even on platforms not directly
// supported by OpenTK.
using (var dummy = new GraphicsContext(
new ContextHandle(context),
SDL.GL.GetAddress,
() => new ContextHandle(SDL.GL.GetCurrentContext())))
{ {
for (int i = 0; i < 100; i++) for (int i = 0; i < 100; i++)
{ {
Sdl2.PumpEvents(); SDL.PumpEvents();
GL.ClearColor(i / 100.0f, i / 100.0f, i / 100.0f, i / 100.0f); GL.ClearColor(i / 100.0f, i / 100.0f, i / 100.0f, i / 100.0f);
GL.Clear(ClearBufferMask.ColorBufferBit); GL.Clear(ClearBufferMask.ColorBufferBit);
Sdl2.SwapWindow(window); SDL.GL.SwapWindow(window);
} }
Sdl2.DestroyWindow(window); SDL.DestroyWindow(window);
} }
} }
} }
@ -47,33 +74,36 @@ namespace Examples.Tests
AllowHighDpi = 0x00002000, AllowHighDpi = 0x00002000,
} }
static class Sdl2 static class SDL
{ {
const string lib = "SDL2.dll"; const string lib = "SDL2.dll";
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_CreateWindow", ExactSpelling = true)] [DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_CreateWindow", ExactSpelling = true)]
public static extern IntPtr CreateWindow(string title, int x, int y, int w, int h, WindowFlags flags); public static extern IntPtr CreateWindow(string title, int x, int y, int w, int h, WindowFlags flags);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_CreateContext", ExactSpelling = true)]
public static extern IntPtr CreateContext(IntPtr window);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_DestroyWindow", ExactSpelling = true)] [DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_DestroyWindow", ExactSpelling = true)]
public static extern void DestroyWindow(IntPtr window); public static extern void DestroyWindow(IntPtr window);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetCurrentContext", ExactSpelling = true)]
public static extern IntPtr GetCurrentContext();
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetProcAddress", ExactSpelling = true)]
public static extern IntPtr GetAddress(string name);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_MakeCurrent", ExactSpelling = true)]
public static extern int MakeCurrent(IntPtr window, IntPtr context);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_PumpEvents", ExactSpelling = true)] [DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_PumpEvents", ExactSpelling = true)]
public static extern void PumpEvents(); public static extern void PumpEvents();
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_SwapWindow", ExactSpelling = true)] public static class GL
public static extern void SwapWindow(IntPtr window); {
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_CreateContext", ExactSpelling = true)]
public static extern IntPtr CreateContext(IntPtr window);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetCurrentContext", ExactSpelling = true)]
public static extern IntPtr GetCurrentContext();
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_GetProcAddress", ExactSpelling = true)]
public static extern IntPtr GetAddress(string name);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_MakeCurrent", ExactSpelling = true)]
public static extern int MakeCurrent(IntPtr window, IntPtr context);
[DllImport(lib, CallingConvention = CallingConvention.Cdecl, EntryPoint = "SDL_GL_SwapWindow", ExactSpelling = true)]
public static extern void SwapWindow(IntPtr window);
}
} }
#endregion #endregion