sandbox: Add work-around for SDL2 display
At present the display does not show on some machines, e.g. Ubunutu
20.04 but the reason is unknown. Add a work-around until this can be
determined.
Also include more error checking just in case.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/cpu/sdl.c b/arch/sandbox/cpu/sdl.c
index 8102649..e264949 100644
--- a/arch/sandbox/cpu/sdl.c
+++ b/arch/sandbox/cpu/sdl.c
@@ -164,8 +164,29 @@
int sandbox_sdl_sync(void *lcd_base)
{
+ struct SDL_Rect rect;
+ int ret;
+
+ if (!sdl.texture)
+ return 0;
+ SDL_RenderClear(sdl.renderer);
SDL_UpdateTexture(sdl.texture, NULL, lcd_base, sdl.pitch);
- SDL_RenderCopy(sdl.renderer, sdl.texture, NULL, NULL);
+ ret = SDL_RenderCopy(sdl.renderer, sdl.texture, NULL, NULL);
+ if (ret) {
+ printf("SDL copy %d: %s\n", ret, SDL_GetError());
+ return -EIO;
+ }
+
+ /*
+ * On some machines this does not appear. Draw an empty rectangle which
+ * seems to fix that.
+ */
+ rect.x = 0;
+ rect.y = 0;
+ rect.w = 0;
+ rect.h = 0;
+ SDL_RenderDrawRect(sdl.renderer, &rect);
+
SDL_RenderPresent(sdl.renderer);
sandbox_sdl_poll_events();