HildonRemoteTexture tearing/flicker
Hi all, I am doing some experiments on using HildonRemoteTexture from a bare X11/SDL app -- basically to get sgx accelerated scaling in apps that wouldn't otherwise use the sgx for anything else. It works, but there seems to be some race condition where the compositor is reading the shared memory area _before_ I send the damage client event to the remote texture X window. This of course cause visible tearing or even flicker if the texture is drawn while (for example) the SNES emulator is just in the middle of rendering any of the background layers, which tends to happen often depending on CPU load / framerate. Note I'm using HildonRemoteTexture instead of AnimationActor because I need no rotation nor any of the actor features and using H-R-T is slightly simpler -- no need to use any of the MIT-SHM functions. But I have to wonder, seeing how the H-R-T API is falling behind if it is going to be deprecated in the future. Feel free to comment on whether this is a good approach or not, too. Eero wrote: hildon-desktop automatically switches to composited mode when needed. Hopefully this includes having a child animation actor / remote texture :) Javier. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
Re: HildonRemoteTexture tearing/flicker
On Tue, 2010-01-12 at 14:47 +0100, ext Javier S. Pedro wrote: Hi all, I am doing some experiments on using HildonRemoteTexture from a bare X11/SDL app -- basically to get sgx accelerated scaling in apps that wouldn't otherwise use the sgx for anything else. It works, but there seems to be some race condition where the compositor is reading the shared memory area _before_ I send the damage client event to the remote texture X window. This of course cause visible tearing or even flicker if the texture is drawn while (for example) the SNES emulator is just in the middle of rendering any of the background layers, which tends to happen often depending on CPU load / framerate. Hmm, I see that the remote texture should update on its own damage ClientMessage, but I don't see where the normal damage handling (for XDamage) ignores remote textures. Maybe we are handling the normal X damage events for your window also -- that would explain if it gets updated before you have sent the magic ClientMessage. Note I'm using HildonRemoteTexture instead of AnimationActor because I need no rotation nor any of the actor features and using H-R-T is slightly simpler -- no need to use any of the MIT-SHM functions. But I have to wonder, seeing how the H-R-T API is falling behind if it is going to be deprecated in the future. It's going to be valid in Fremantle but most probably not in Harmattan, because applications are more OpenGL-oriented there. Feel free to comment on whether this is a good approach or not, too. Eero wrote: hildon-desktop automatically switches to composited mode when needed. Hopefully this includes having a child animation actor / remote texture :) Please use the git HEAD of hildon-desktop, libmatchbox2 and clutter0.8 to make sure... :) -Kimmo Javier. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
Re: HildonRemoteTexture tearing/flicker
On Tue, 2010-01-12 at 15:30 +0100, Hamalainen Kimmo (Nokia-D/Helsinki) wrote: On Tue, 2010-01-12 at 14:47 +0100, ext Javier S. Pedro wrote: Hi all, ... Please use the git HEAD of hildon-desktop, libmatchbox2 and clutter0.8 to make sure... :) I checked that Image Viewer is not using remote texture at all, so the implementation could easily break by accident. Therefore you should indeed check the git version or use animation actor instead. -Kimmo -Kimmo Javier. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
