Mesa's eglSwapBuffers() waits for the frame event from the previous swapBuffers, before it returns. Apparently eglSwapInterval(), which should be able to disable the wait, is unimplemented for now. When a sub-surface contains an EGL widget, and the commit mode is synchronized, the frame events will not be delivered to EGL until the parent surface gets committed. Therefore rendering the EGL widget twice would lead to a deadlock. When the window is being resized, we need to force a repaint of the EGL widget, too, to make the whole window consistent. For that, we need to make sure the frame event from the previous eglSwapBuffers() actually arrives. This patch adds an extra wl_surface.commit(parent), when the window is being resized, which should guarantee, that the previous eglSwapBuffers gets its event. To properly handle an EGL widget in a sub-surface, running in its own thread, the EGL widget's automatic updates should be paused before sending the extra wl_surface.commit(parent). A natural place for the pause would be in the widget's resize hook. However, wl_surface.commit cannot be called right after resize hooks, because it would commit new, incomplete surface state. Therefore this patch is not enough for threaded toytoolkit applications. Luckily those do not exist yet. When eglSwapInterval() gets implemented, this patch should be reverted. Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
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