Setup GL context in main thread (macOS 10.15 requires it)

src/eventthread.h

@@ -260,6 +260,8 @@ struct RGSSThreadData
 
 	SDL_Window *window;
 	ALCdevice *alcDev;
+    
+    SDL_GLContext glContext;
 
 	Vec2 sizeResoRatio;
 	Vec2i screenOffset;
@@ -274,14 +276,16 @@ struct RGSSThreadData
 	               SDL_Window *window,
 	               ALCdevice *alcDev,
 	               int refreshRate,
-	               const Config& newconf)
+	               const Config& newconf,
+                   SDL_GLContext ctx)
 	    : ethread(ethread),
 	      argv0(argv0),
 	      window(window),
 	      alcDev(alcDev),
 	      sizeResoRatio(1, 1),
 	      refreshRate(refreshRate),
-	      config(newconf)
+	      config(newconf),
+          glContext(ctx)
 	{}
 };
 

src/main.cpp

@@ -75,47 +75,6 @@ int rgssThreadFun(void *userdata)
 	RGSSThreadData *threadData = static_cast<RGSSThreadData*>(userdata);
 	const Config &conf = threadData->config;
 	SDL_Window *win = threadData->window;
-	SDL_GLContext glCtx;
-
-	/* Setup GL context */
-	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
-
-	if (conf.debugMode)
-		SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
-
-	glCtx = SDL_GL_CreateContext(win);
-
-	if (!glCtx)
-	{
-		rgssThreadError(threadData, std::string("Error creating context: ") + SDL_GetError());
-		return 0;
-	}
-
-	try
-	{
-		initGLFunctions();
-	}
-	catch (const Exception &exc)
-	{
-		rgssThreadError(threadData, exc.msg);
-		SDL_GL_DeleteContext(glCtx);
-
-		return 0;
-	}
-
-	if (!conf.enableBlitting)
-		gl.BlitFramebuffer = 0;
-
-	gl.ClearColor(0, 0, 0, 1);
-	gl.Clear(GL_COLOR_BUFFER_BIT);
-	SDL_GL_SwapWindow(win);
-
-	printGLInfo();
-
-	bool vsync = conf.vsync || conf.syncToRefreshrate;
-	SDL_GL_SetSwapInterval(vsync ? 1 : 0);
-
-	GLDebugLogger dLogger;
 
 	/* Setup AL context */
 	ALCcontext *alcCtx = alcCreateContext(threadData->alcDev, 0);
@@ -123,8 +82,6 @@ int rgssThreadFun(void *userdata)
 	if (!alcCtx)
 	{
 		rgssThreadError(threadData, "Error creating OpenAL context");
-		SDL_GL_DeleteContext(glCtx);
-
 		return 0;
 	}
 
@@ -138,7 +95,6 @@ int rgssThreadFun(void *userdata)
 	{
 		rgssThreadError(threadData, exc.msg);
 		alcDestroyContext(alcCtx);
-		SDL_GL_DeleteContext(glCtx);
 
 		return 0;
 	}
@@ -152,7 +108,6 @@ int rgssThreadFun(void *userdata)
 	SharedState::finiInstance();
 
 	alcDestroyContext(alcCtx);
-	SDL_GL_DeleteContext(glCtx);
 
 	return 0;
 }
@@ -358,8 +313,52 @@ int main(int argc, char *argv[])
 		conf.syncToRefreshrate = false;
 
 	EventThread eventThread;
+    
+    SDL_GLContext glCtx{};
+    
+    /* Setup GL context. Must be done in main thread since macOS 10.15 */
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+    if (conf.debugMode)
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
+
+    glCtx = SDL_GL_CreateContext(win);
+
+    if (!glCtx)
+    {
+        showInitError(std::string("Error creating context: ") + SDL_GetError());
+        return 0;
+    }
+
+    try
+    {
+        initGLFunctions();
+    }
+    catch (const Exception &exc)
+    {
+        showInitError(exc.msg);
+        SDL_GL_DeleteContext(glCtx);
+
+        return 0;
+    }
+
+    if (!conf.enableBlitting)
+        gl.BlitFramebuffer = 0;
+
+    gl.ClearColor(0, 0, 0, 1);
+    gl.Clear(GL_COLOR_BUFFER_BIT);
+    SDL_GL_SwapWindow(win);
+
+    printGLInfo();
+
+    bool vsync = conf.vsync || conf.syncToRefreshrate;
+    SDL_GL_SetSwapInterval(vsync ? 1 : 0);
+
+    GLDebugLogger dLogger;
+    
+    
 	RGSSThreadData rtData(&eventThread, argv[0], win,
-	                      alcDev, mode.refresh_rate, conf);
+	                      alcDev, mode.refresh_rate, conf, glCtx);
 
 	int winW, winH;
 	SDL_GetWindowSize(win, &winW, &winH);
@@ -412,6 +411,7 @@ int main(int argc, char *argv[])
 
 	Debug() << "Shutting down.";
 
+    SDL_GL_DeleteContext(glCtx);
 	alcCloseDevice(alcDev);
 	SDL_DestroyWindow(win);
 

src/sharedstate.cpp

@@ -184,7 +184,8 @@ void SharedState::initInstance(RGSSThreadData *threadData)
 	 * Font depends on SharedState existing */
 
 	rgssVersion = threadData->config.rgssVersion;
-
+    SDL_GL_MakeCurrent(threadData->window, threadData->glContext);
+    
 	_globalIBO = new GlobalIBO();
 	_globalIBO->ensureSize(1);