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sandbox: Add work-around for SDL2 display

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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>
This commit is contained in:
Simon Glass 2021-07-05 16:32:46 -06:00
parent f178bebf55
commit fcb7e31082
1 changed files with 22 additions and 1 deletions
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23
arch/sandbox/cpu/sdl.c
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@ -164,8 +164,29 @@ int sandbox_sdl_init_display(int width, int height, int log2_bpp,
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();