[Mesa-dev] [PATCH 0/2] Disable the EGL state tracker for Linux/DRI builds

Chia-I Wu olvaffe at gmail.com
Wed Nov 5 22:04:13 PST 2014

On Wed, Nov 5, 2014 at 6:42 AM, Marek Olšák <maraeo at gmail.com> wrote:
> Hi everybody,
> I'm about to address this long-standing issue: The EGL state tracker is
> redundant. It duplicates what st/dri does and it also duplicates what
> the common loader egl_dri2 does, which is used by all classic drivers
> and even works better with gallium drivers.
> Let's compare EGL extensions for both backends:
> st/egl:
> EGL version string: 1.4 (Gallium)
> EGL client APIs: OpenGL OpenGL_ES OpenGL_ES2 OpenVG
> EGL extensions string:
>     EGL_WL_bind_wayland_display EGL_KHR_image_base EGL_KHR_image_pixmap
>     EGL_KHR_image EGL_KHR_reusable_sync EGL_KHR_fence_sync
>     EGL_KHR_surfaceless_context EGL_NOK_swap_region
>     EGL_NV_post_sub_buffer
> egl_dri2:
> EGL version string: 1.4 (DRI2)
> EGL client APIs: OpenGL OpenGL_ES OpenGL_ES2 OpenGL_ES3
> EGL extensions string:
>     EGL_MESA_drm_image EGL_MESA_configless_context EGL_KHR_image_base
>     EGL_KHR_image_pixmap EGL_KHR_image EGL_KHR_gl_texture_2D_image
>     EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image
>     EGL_KHR_surfaceless_context EGL_KHR_create_context
>     EGL_NOK_swap_region EGL_NOK_texture_from_pixmap
>     EGL_CHROMIUM_sync_control EGL_EXT_image_dma_buf_import
>     EGL_NV_post_sub_buffer
> egl_dri2 also supports MSAA on the window framebuffer (through st/dri).
> It's really obvious which one is better.
> I'm aware of 2 features that we will lose:
> - swrast on Wayland - I'm not sure about this. Perhaps kms-swrast has
> addressed this already.
> - OpenVG - It has never taken off. If people want this on Linux, it should
> use egl_dri2 and st/dri, like OpenGL does.
> This series removes st/egl and st/gbm support from the autoconf build
> (the latter depends on the former and is probably just as redundant).
> The next step is to remove all Linux-specific backends from st/egl.
> Windows, Android, and other platform backends will be kept intact,
> therefore st/egl won't be removed completely.
While I think Pekka and Jose have valid arguments, I am not sure if
anyone is taking care of st/egl bug reports and patch reviews.  If no
one is, it might be better for st/egl to go than to stay IMHO.

> Please comment.
> Thanks,
> Marek
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> mesa-dev at lists.freedesktop.org
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olv at LunarG.com

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