Cleanup of context clearing during window destruction.

src/cocoa_window.m

@@ -969,9 +969,6 @@ void _glfwPlatformDestroyWindow(_GLFWwindow* window)
     [window->NSGL.pixelFormat release];
     window->NSGL.pixelFormat = nil;
 
-    if ([NSOpenGLContext currentContext] == window->NSGL.context)
-        [NSOpenGLContext clearCurrentContext];
-
     [window->NSGL.context release];
     window->NSGL.context = nil;
 

src/win32_opengl.c

@@ -528,11 +528,6 @@ int _glfwCreateContext(_GLFWwindow* window,
 
 void _glfwDestroyContext(_GLFWwindow* window)
 {
-    // This is duplicated from glfwDestroyWindow
-    // TODO: Stop duplicating code
-    if (window == _glfwCurrentWindow)
-        _glfwPlatformMakeContextCurrent(NULL);
-
     if (window->WGL.context)
     {
         wglDeleteContext(window->WGL.context);

src/win32_window.c

@@ -947,8 +947,16 @@ int _glfwPlatformCreateWindow(_GLFWwindow* window,
         // we're just creating an OpenGL 3.0+ context with the same pixel
         // format, but it's not worth the added code complexity
 
+        // First we clear the current context (the one we just created)
+        // This is usually done by glfwDestroyWindow, but as we're not doing
+        // full window destruction, it's duplicated here
+        _glfwPlatformMakeContextCurrent(NULL);
+
+        // Next destroy the Win32 window and WGL context (without resetting or
+        // destroying the GLFW window object)
         destroyWindow(window);
 
+        // ...and then create them again, this time with better APIs
         if (!createWindow(window, wndconfig, fbconfig))
             return GL_FALSE;
     }

src/window.c

@@ -483,8 +483,8 @@ GLFWAPI void glfwDestroyWindow(GLFWwindow handle)
     if (window == NULL)
         return;
 
-    // Clear the current context if this window's context is current
-    // TODO: Re-examine this in light of multithreading
+    // The window's context must not be current on another thread when the
+    // window is destroyed
     if (window == _glfwPlatformGetCurrentContext())
         _glfwPlatformMakeContextCurrent(NULL);
 

src/x11_opengl.c

@@ -619,8 +619,6 @@ void _glfwDestroyContext(_GLFWwindow* window)
 
     if (window->GLX.context)
     {
-        // Release and destroy the context
-        glXMakeCurrent(_glfwLibrary.X11.display, None, NULL);
         glXDestroyContext(_glfwLibrary.X11.display, window->GLX.context);
         window->GLX.context = NULL;
     }