Don't do any processing internally if GL context creation failed

renderdoc/driver/gl/gl_hooks_linux.cpp

@@ -586,6 +586,10 @@ __attribute__ ((visibility ("default")))
 GLXContext glXCreateContext(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct)
 {
 	GLXContext ret = OpenGLHook::glhooks.glXCreateContext_real(dpy, vis, shareList, direct);
+
+	// don't continue if context creation failed
+	if(!ret)
+		return ret;
 	
 	GLInitParams init;
 	
@@ -688,6 +692,10 @@ GLXContext glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config, GLXConte
 
 	GLXContext ret = OpenGLHook::glhooks.glXCreateContextAttribsARB_real(dpy, config, shareList, direct, attribs);
 
+	// don't continue if context creation failed
+	if(!ret)
+		return ret;
+
 	XVisualInfo *vis = OpenGLHook::glhooks.glXGetVisualFromFBConfig_real(dpy, config);	
 	
 	GLInitParams init;

renderdoc/driver/gl/gl_hooks_win32.cpp

@@ -386,8 +386,8 @@ class OpenGLHook : LibraryHook
 		{
 			HGLRC ret = glhooks.wglCreateContext_hook()(dc);
 
-			// don't recurse
-			if(glhooks.m_CreatingContext)
+			// don't recurse and don't continue if creation failed
+			if(glhooks.m_CreatingContext || ret == NULL)
 				return ret;
 
 			glhooks.m_CreatingContext = true;
@@ -422,8 +422,8 @@ class OpenGLHook : LibraryHook
 		{
 			HGLRC ret = glhooks.wglCreateLayerContext_hook()(dc, iLayerPlane);
 
-			// don't recurse
-			if(glhooks.m_CreatingContext)
+			// don't recurse and don't continue if creation failed
+			if(glhooks.m_CreatingContext || ret == NULL)
 				return ret;
 
 			glhooks.m_CreatingContext = true;
@@ -515,6 +515,10 @@ class OpenGLHook : LibraryHook
 			
 			HGLRC ret = glhooks.wglCreateContextAttribsARB_realfunc(dc, hShareContext, attribs);
 
+			// don't continue if creation failed
+			if(ret == NULL)
+				return ret;
+
 			GLWindowingData data;
 			data.DC = dc;
 			data.wnd = WindowFromDC(dc);