winex11: Don't reset OpenGL swap interval of window on SetParent().

dlls/opengl32/tests/opengl.c

@@ -1509,7 +1509,7 @@ static void test_swap_control(HDC oldhdc)
         0, 0, 0                /* layer masks */
     };
     int pixel_format;
-    HWND window1, window2;
+    HWND window1, window2, old_parent;
     HGLRC ctx1, ctx2, oldctx;
     BOOL ret;
     HDC dc1, dc2;
@@ -1550,7 +1550,7 @@ static void test_swap_control(HDC oldhdc)
     ok(ret, "Failed to set swap interval to 0, last error %#x.\n", GetLastError());
 
     interval = pwglGetSwapIntervalEXT();
-    ok(interval == 0, "Expected default swap interval 0, got %d\n", interval);
+    ok(interval == 0, "Expected swap interval 0, got %d\n", interval);
 
     /* Check what interval we get on a second context on the same drawable.*/
     ctx2 = wglCreateContext(dc1);
@@ -1582,7 +1582,17 @@ static void test_swap_control(HDC oldhdc)
      * is not global or shared among contexts.
      */
     interval = pwglGetSwapIntervalEXT();
-    ok(interval == 1, "Expected swap interval 1, got %d\n", interval);
+    ok(interval == 1, "Expected default swap interval 1, got %d\n", interval);
+
+    /* Test if setting the parent of a window resets the swap interval. */
+    ret = wglMakeCurrent(dc1, ctx1);
+    ok(ret, "Failed to make context current, last error %#x.\n", GetLastError());
+
+    old_parent = SetParent(window1, window2);
+    ok(!!old_parent, "Failed to make window1 a child of window2, last error %#x.\n", GetLastError());
+
+    interval = pwglGetSwapIntervalEXT();
+    ok(interval == 0, "Expected swap interval 0, got %d\n", interval);
 
     ret = wglDeleteContext(ctx1);
     ok(ret, "Failed to delete GL context, last error %#x.\n", GetLastError());

dlls/winex11.drv/opengl.c

@@ -1253,10 +1253,6 @@ static void free_gl_drawable( struct gl_drawable *gl )
 static BOOL create_gl_drawable( HWND hwnd, HWND parent, struct gl_drawable *gl )
 {
     gl->drawable = 0;
-    /* Default GLX and WGL swap interval is 1, but in case of glXSwapIntervalSGI
-     * there is no way to query it, so we have to store it here.
-     */
-    gl->swap_interval = 1;
 
     if (GetAncestor( hwnd, GA_PARENT ) == GetDesktopWindow())  /* top-level window */
     {
@@ -1331,6 +1327,10 @@ static BOOL set_win_format( HWND hwnd, const struct wgl_pixel_format *format )
     struct gl_drawable *gl, *prev;
 
     gl = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*gl) );
+    /* Default GLX and WGL swap interval is 1, but in case of glXSwapIntervalSGI
+     * there is no way to query it, so we have to store it here.
+     */
+    gl->swap_interval = 1;
     gl->format = format;
     gl->visual = pglXGetVisualFromFBConfig( gdi_display, format->fbconfig );
     if (!gl->visual)