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

Michel Dänzer michel at daenzer.net
Wed Nov 5 00:02:45 PST 2014

On 05.11.2014 07:42, Marek Olšák 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.

No argument there.

> - OpenVG - It has never taken off. If people want this on Linux, it should
> use egl_dri2 and st/dri, like OpenGL does.

The problem is doing so would probably be a lot of work, so this creates 
a huge barrier for somebody who wants to play with OpenVG.

How about keeping egl_gallium but only using it if 
EGL_DRIVER=egl_gallium is specified explicitly? (I assume automatically 
using egl_gallium for OpenVG isn't possible due to the way EGL works)

Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer

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