[Bug 91534] r300 blocking GLX and EGL compositing in KWin (KDE Plasma 5.x)?

[Bug 91534] r300 blocking GLX and EGL compositing in KWin (KDE Plasma 5.x)?

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https://bugs.freedesktop.org/show_bug.cgi?id=91534

            Bug ID: 91534
           Summary: r300 blocking GLX and EGL compositing in KWin (KDE
                    Plasma 5.x)?
           Product: Mesa
           Version: 10.5
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: aaron.d.pickett@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 117488
  --> https://bugs.freedesktop.org/attachment.cgi?id=117488&action=edit
Attempt to force EGL-based OpenGL compositing

I have an old laptop with ATI RS480 graphics (Radeon Xpress 200M), and I've
been testing KDE Plasma 5.x in KUbuntu 15.04 (currently version 5.3 from the
backports PPA).  In all the versions I've tried, OpenGL compositing fails.  For
the GLX API, I assume this is because r300 *almost* supports OpenGL 2.1, but
falls short on NPOT texture support.

After some reading
(http://blog.martin-graesslin.com/blog/2011/07/running-kwin-with-opengl-es-2-0/),
I thought I might try the EGL API for OpenGL ES compositing.  The GUI wouldn't
let me select EGL, so I forced it using environment variables
(https://community.kde.org/KWin/Environment_Variables) as follows:
KWIN_OPENGL_INTERFACE=egl
KWIN_COMPOSE=O1 (I also tried O2, same result)

Unfortunately, the (truncated) result is:
kwin_core: OpenGL driver recommends XRender based compositing. Falling back to
XRender.
...
kwin_core: Failed to initialize compositing, compositing disabled

>From what I've read, the r300 should have full OpenGL ES 2.0 support, so is the
driver blocking EGL compositing unnecessarily?  

The full log of my attempt to force EGL-based compositing is attached.

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[Bug 91534] r300 blocking GLX and EGL compositing in KWin (KDE Plasma 5.x)?

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https://bugs.freedesktop.org/show_bug.cgi?id=91534

--- Comment #1 from Emil Velikov <emil.l.velikov@gmail.com> ---
Hi Aaron,

We do have some fixes in mesa 10.6.x that never made it into 10.5 series. I
would give mesa 10.6.x a spin first.

I'm not a r300 dev myself so I cannot comment on the driver, although it
doesn't show any signs of issues. Here are some bits you might find
interesting:

- Seemingly the driver already exposes NPOT + OpenGL 2.1 (albeit some hardware
limitations, which should be handled by the driver).

- GLX does not always mean you'll get OpenGL, similar to EGL and OpenGLES. One
can mix and match depending on various factors.

In your case EGL + OpenGL is attempted but I'm not sure how to force gles.
Older versions had kwin_gles, which seems to be gone with the 5 series. Might
want to look into a way of forcing gles, and getting more verbose output on
kwin side.

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[Bug 91534] r300 blocking GLX and EGL compositing in KWin (KDE Plasma 5.x)?

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https://bugs.freedesktop.org/show_bug.cgi?id=91534

--- Comment #2 from Marek Olšák <maraeo@gmail.com> ---
Hi, r300 doesn't support NPOT textures fully. The only thing it supports is 2D
NPOT textures without mipmapping. That's pretty limited, but it was what D3D9
originally required. In other words, the driver shouldn't report that it
supports NPOT textures, but then we would lose GL2 support, which would be a
lot bigger problem.

There is no fix other than complete software emulation, which nobody wants.

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[Bug 91534] r300 blocking GLX and EGL compositing in KWin (KDE Plasma 5.x)?

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https://bugs.freedesktop.org/show_bug.cgi?id=91534

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #3 from Marek Olšák <maraeo@gmail.com> ---
I suggest you talk to the KDE guys whether there is a solution. You can point
them to my replies.

The thing is there has never been a GL2 GPU on the market, so the GL2
specification was kind of a fail. There were GL1.5 GPUs (r500) and then GL3
GPUs (r600), yet the market demanded GL2 drivers.

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