[Mesa-dev] (no subject)

[Chia-I Wu]

Hi Kristian,

2010/6/4 Kristian Høgsberg <krh at bitplanet.net>:
> Here's an update on the EGL/DRM integration extensions and patches.
> I've updated the patches with the feedback from the discussions on the
> list to the extent that I think is feasible.  I think we're pretty
> close to consensus on how to do this, but let me know what you think.
> There's also a new extension in the series, the EGL_INTEL_no_surface
> extension, which lets us make a context current without a surface.
The summary looks fine to me.  Please go ahead with your changes.  I have one
comment below regarding the first patch.  It is fine to ignore it unless you
feel convinced.
> I updated the eglkms.c test case, and it now compiles and runs against
> this patch series:
>
>  http://cgit.freedesktop.org/~krh/mesa-demos/tree/src/egl/opengl/eglkms.c
>
> [PATCH 1/6] egl: Add MESA_typed_display infrastructure
>  This is the updated version of the alternative eglGetDisplay
>  extension.  I've incorporated the feedback from Chia-I regarding
>  naming of the entry point and tokens, and Jakobs suggestion that we
>  add tokens for the existing platforms (Win32 and X11).
>  It's still a new entrypoint, not separate .so's as Chia-I suggested.
>  I don't think it's a terrible idea to have separate .so's with
>  different names, but I still like this better, and with separate
>  .so's we'll have to compile libEGL several times to output the
>  different libraries, which is awkward and a pain for distributions.
>  I dropped the XCB display for now.
As the extension cannot be tested, it looks like a hack to me, only with a
spec.  Having separating libraries allows the issue to be resolved in the build
systems (of apps), instead of in the code.  Say, wayland is adopted by a mobile
device where there is DRM but no X server.  It is natural that eglGetDisplay on
that platform takes a DRM fd, and the extension becomes redundant.  If wayland
linked to libEGL-drm.so, whose eglGetDisplay expects a DRM fd, on a common
desktop, building wayland to the platform would require only a change to the
build rules.
> [PATCH 2/6] egl_dri2: Support EGL_DISPLAY_TYPE_DRM_MESA
>
>  This one just adds support to egl_dri2, should be pretty harmless.
>
> [PATCH 3/6] egl: EGL_INTEL_no_surface extension
>
>  The new extension mentioned above.  It adds a new config attribute
>  to inidicate the APIs that support making a context current with
>  that config and no surfaces.  Previous discussion on this have
>  stalled on the problem that not all client APIs have a meaningful
>  way to make a context current without surfaces.  By specifying the
>  supported APIs in the config we solve this problem.  See the spec in
>  the patch for details.
>
> [PATCH 4/6] egl: MESA_image_drm extension
>
>  This is the extension to create drm images from nothing using
>  eglCreateDRMImageMESA, share them using eglShareDRMImageMesa, and
>  import them using the EGL_DRM_BUFFER_MESA target with
>  eglCreateImageKHR.  Sharing an image is a separate entrypoint
>  because a drm buffer doesn't necesarily have a global name and
>  creating one is an extra step that we don't always want to incur.
> [PATCH 5/6] egl_dri2: Add support for MESA_image_drm
>
>  Nothing to see here, just the implementation.  Some of the
>  attrib_list checking could be lifted to egl/main.
>
> [PATCH 6/6] intel: Add support for MESA_drm_image
>
>  The intel dri driver side of things.
>
> Kristian
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>



-- 
olv at LunarG.com