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SDL2: Only pass a single rectangle to SDL_UpdateWindowSurfaceRects

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This is to prevent screen tearing
This commit is contained in:
Jonathan G Rennison
2020-10-05 21:35:05 +01:00
parent 1298f49be6
commit 51477334be
1 changed files with 10 additions and 1 deletions
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11
src/video/sdl2_v.cpp
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@@ -396,8 +396,17 @@ static void DrawSurfaceToScreen()
SDL_BlitSurface(_sdl_surface, &_dirty_rects[i], _sdl_realscreen, &_dirty_rects[i]);
}
}
SDL_Rect update_rect = { _sdl_surface->w, _sdl_surface->h, 0, 0 };
for (int i = 0; i < n; i++) {
if (_dirty_rects[i].x < update_rect.x) update_rect.x = _dirty_rects[i].x;
if (_dirty_rects[i].y < update_rect.y) update_rect.y = _dirty_rects[i].y;
if (_dirty_rects[i].x + _dirty_rects[i].w > update_rect.w) update_rect.w = _dirty_rects[i].x + _dirty_rects[i].w;
if (_dirty_rects[i].y + _dirty_rects[i].h > update_rect.h) update_rect.h = _dirty_rects[i].y + _dirty_rects[i].h;
}
update_rect.w -= update_rect.x;
update_rect.h -= update_rect.y;
SDL_UpdateWindowSurfaceRects(_sdl_window, _dirty_rects, n);
SDL_UpdateWindowSurfaceRects(_sdl_window, &update_rect, 1);
}
}