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A game framework written with osu! in mind.
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1// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
2// See the LICENCE file in the repository root for full licence text.
3
4using System;
5using SDL2;
6
7namespace osu.Framework.Platform.SDL2
8{
9 /// <summary>
10 /// Implementation of <see cref="PassthroughGraphicsBackend"/> that uses SDL's OpenGL bindings.
11 /// </summary>
12 public class SDL2GraphicsBackend : PassthroughGraphicsBackend
13 {
14 private IntPtr sdlWindowHandle;
15
16 public override bool VerticalSync
17 {
18 get => SDL.SDL_GL_GetSwapInterval() != 0;
19 set => SDL.SDL_GL_SetSwapInterval(value ? 1 : 0);
20 }
21
22 protected override IntPtr CreateContext()
23 {
24 SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_PROFILE_MASK, SDL.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);
25
26 IntPtr context = SDL.SDL_GL_CreateContext(sdlWindowHandle);
27 if (context == IntPtr.Zero)
28 throw new InvalidOperationException($"Failed to create an SDL2 GL context ({SDL.SDL_GetError()})");
29
30 return context;
31 }
32
33 protected override void MakeCurrent(IntPtr context)
34 {
35 int result = SDL.SDL_GL_MakeCurrent(sdlWindowHandle, context);
36 if (result < 0)
37 throw new InvalidOperationException($"Failed to acquire GL context ({SDL.SDL_GetError()})");
38 }
39
40 public override void SwapBuffers() => SDL.SDL_GL_SwapWindow(sdlWindowHandle);
41
42 protected override IntPtr GetProcAddress(string symbol) => SDL.SDL_GL_GetProcAddress(symbol);
43
44 public override void Initialise(IWindow window)
45 {
46 if (!(window is SDL2DesktopWindow sdlWindow))
47 throw new ArgumentException("Unsupported window backend.", nameof(window));
48
49 sdlWindowHandle = sdlWindow.SDLWindowHandle;
50 base.Initialise(window);
51 }
52 }
53}