Optimization suggested by Ryan:

Don't set the same OpenGL context multiple times
libsdl-org · Aug 15, 2007 · e9f192a · e9f192a
1 parent eb6619e
commit e9f192a
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diff --git a/src/video/SDL_sysvideo.h b/src/video/SDL_sysvideo.h
@@ -126,6 +126,7 @@ struct SDL_Window
 
     int display;
     SDL_Renderer *renderer;
+    SDL_GLContext context;
 
     void *userdata;
     void *driverdata;

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
@@ -2566,6 +2566,12 @@ SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
     if (!context) {
         window = NULL;
     }
+    if (window) {
+        if (window->context == context) {
+            return 0;
+        }
+        window->context = context;
+    }
     return _this->GL_MakeCurrent(_this, window, context);
 }