Testing the Wayland backend for Dolphin-Emu

[小龙 陈]

It turns out that the X11 issues with EGL happened because I didn't set
LIBGL_DRIVERS_PATH and LD_LIBRARY_PATH to where mesa git
was installed. Thanks to Scott for pointing this out!

So, with the environment set up properly, X11 + EGL works fine now. It's
slower than Wayland + EGL:

Windowed (640x480): 50~60 fps
Full Screen (1920x1080): 45~52 fps

but there are no more rendering issues and the games are definitely playable.

Best regards,
Xiao-Long

(Sorry for the second email. I forgot to hit Reply All in the first)

________________________________
> Date: Mon, 18 Feb 2013 15:42:37 -0700 
> Subject: Re: Testing the Wayland backend for Dolphin-Emu 
> From: oreaus at gmail.com 
> To: chillermillerlong at hotmail.com 
> CC: wayland-devel at lists.freedesktop.org 
> 
> 
> Hi 小龙 陈, 
> 
> Thanks for testing. I did not have time to try very many possible cases. 
> 
> On Mon, Feb 18, 2013 at 3:19 PM, 小龙 陈 
> <chillermillerlong at hotmail.com<mailto:chillermillerlong at hotmail.com>> 
> wrote: 
> Hi everyone, 
> 
> I did some testing with the new Wayland backend for Dolphin-emu posted here 
> yesterday: 
> http://lists.freedesktop.org/archives/wayland-devel/2013-February/007470.html 
> 
> Hopefully someone find them useful. Please let me know if you have any 
> questions (I'm no developer :D) or if there's anything else you would like me 
> to test. 
> 
> Best Regards, 
> Xiao-Long Chen 
> 
> 
> ---------- 
> Build info 
> ---------- 
> Dolphin-Emu Git Master 
> -> cmake .. -DCMAKE_INSTALL_PREFIX=/opt/dolphin-emu-master \ 
> -DCMAKE_BUILD_TYPE=Release 
> 
> Dolphin-Emu Wayland-EGL Branch 
> -> Built against wayland commit: df1a934b8b24c9227d427f3035007867993a6612 
> and weston commit: 1cc9e08d2fbd59e34cf5009acd5067a6b171c20a 
> and mesa commit: dd599188d2868838541859a76800a8420958d358 
> -> CXXFLAGS="-I/opt/wayland/include -L/opt/wayland/lib" \ 
> cmake .. -DCMAKE_INSTALL_PREFIX=/opt/dolphin-emu-wayland \ 
> -DCMAKE_PREFIX_PATH=/opt/dolphin-emu-wayland \ 
> -DCMAKE_BUILD_TYPE=Release \ 
> -DUSE_EGL=1 \ 
> -DDISABLE_WX=1 \ 
> -DUSE_X11=1 \ 
> -DUSE_WAYLAND=1 
> 
> ------- 
> Testing 
> ------- 
> The testing was done on a Lenovo W520 with Intel Sandy Bridge graphics and an 
> NVIDIA Quadro 2000m. I used the Intel GPU because nouveau has rendering 
> issues 
> with dolphin. The game tested was Super Smash Bros Brawl (for Wii). 
> 
> The system is running Ubuntu 13.04 with wayland, weston, and mesa 
> compiled from 
> git. I did record videos of all of the tests, but they don't really show 
> anything. Ffmpeg with x11grab had a ~40% performance hit, recordmydesktop was 
> incredibly stuttery and had a low bitrate, and Weston's built in 
> recorder had a 
> ~60% performance hit in full screen mode (and a 10GB file). 
> 
> Needless to say, the videos are useless, so I'll write my general findings on 
> the quality. 
> 
> ---------------------- 
> Dolphin-Emu Git Master 
> ---------------------- 
> Windowed (640x480) 
> -> X11: Always 60 fps 
> 
> Full Screen (1920x1080) 
> -> X11: Usually 60 fps (with no compositing), 49~52 fps (with compositing) 
> 
> ------------------------------ 
> Dolphin-Emu Wayland-EGL Branch 
> ------------------------------ 
> Windowed (640x480) 
> -> X11: Unplayable: 
> Sometimes it runs at 60 fps, but the area from the 
> bottom right 
> corner of the window to the center of the window continuously 
> flickers. Other parts of the screen are also corrupted 
> while the 
> game is running. 
> Other times, the game runs at 0~16 fps and the top ~15% of the 
> window is corrupted. 
> 
> This sounds like what I experienced using the GLX path. 
> 
> -> Wayland: Usually 60 fps with occasional slowdown to 57 fps 
> 
> Full Screen (1920x1080) 
> -> X11: Unplayable: same as in windowed mode 
> 
> X11+EGL seem to work ok here in windowed and fullscreen. 
> 
> -> Wayland: 57~60 fps with occasional slowdown to 53 fps 
> 
> It is noteworthy that the maximum frames per second should never exceed 
> the refresh rate of your monitor, with the current mesa EGL 
> implementation. 
> 
> 
> ------- 
> Quality 
> ------- 
> X11 without compositing was pretty stuttery at times, especially when 
> the game 
> slowed down (ie. with 4 players in SSBB). With compositing enabled, the game 
> was slow, but it was very smooth. 
> 
> Under wayland, the gameplay was very smooth like in X11 w/compositing, but it 
> felt much faster. The fps generally stayed around 60 fps, except during the 
> graphically intensive parts of the game. I was not able to find any rendering 
> issues that didn't exist in X (or Windows, for that matter). 
> 
> X with EGL was completely unplayable. The problems with rendering makes it 
> very hard to press the buttons necessary to even enter the game. 
> 
> Thanks for your review. It's nice to have informative testers. 
> 
> 
> - Scott 
> 
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