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testmessage: Create a renderer for window display on Wayland

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On Wayland -- or at least on some Wayland implementations -- windows
aren't shown until something has been rendered into them. For the
'testmessage' test program, this means that the final messagebox (a
modal one) is blocking an "invisible window", which can then be
difficult to close.

By creating a renderer and presenting once, the window is properly
displayed, and the test behaves as it does under X11 (including
XWayland).
This commit is contained in:
David Gow 2021-03-29 18:12:33 +08:00 committed by Sam Lantinga
parent 5f9effaa7e
commit 1cd97e2695
1 changed files with 6 additions and 0 deletions
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6
test/testmessage.c
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@ -189,6 +189,12 @@ main(int argc, char *argv[])
SDL_Event event;
SDL_Window *window = SDL_CreateWindow("Test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, 0);
/* On wayland, no window will actually show until something has
actually been displayed.
*/
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
SDL_RenderPresent(renderer);
success = SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
"Simple MessageBox",
"This is a simple error MessageBox with a parent window",