On Fri, Sep 9, 2016 at 4:18 AM, Cemil Azizoglu
<cemil.azizo...@canonical.com> wrote:
We quite literally cast MirRenderSurface* to EGLNativeWindowSurface
in the current WIP:
http://bazaar.launchpad.net/%7Ecemil-azizoglu/mir/mir-render-surface-v3/view/head:/playground/eglflash_render_surface.c#L112
Perhaps, I should point out that our EGLNativeWindowType is not
(and cannot be) 'MirRenderSurface'. It's void*. This is because we
(have to) pretend to be other platforms (Android).
Hm, this got me thinking.
*Does* Mir need to pretend to be SurfaceFlinger?
As I understand it, the only relevant constraint is that we need to be
able to bring up Unity8 and USC using unmodified Android drivers.
- This means we need to use Android libEGL at *some* point in the
stack.
- We (as in Ubuntu) control what libEGL.so.1 resolves to.
+ This does *not* have to be Android's libEGL - indeed, it's
currently *not* Android's libEGL, it's libhybris' wrapper.
- This means we have the opportunity to interpose code between
EGL-using clients and Android's EGL.
I looked at the code in platforms/android/client, and there doesn't
appear to be any code there that can *only* be implemented inside a
platform module. Indeed, it looks like the NBS API was basically
designed to allow code linking against libmirclient to do exactly what
is done inside the EGLNativeWindow producing bits of the Android
platform.
So I think we *could* #define EGLNativeWindowType MirRenderSurface*
(and likewise #define EGLNativeDisplayType MirConnection*) without a
great deal of effort required. Mostly this would require moving code
from platforms/android/client into a new libEGL that implements
eglGetDisplay() and eglCreateWindowSurface() and links to the hybris
libEGL to satisfy all other EGL symbols.
This would make Mir look like all other EGL platforms. To create an
EGLDisplay you'd eglGetDisplay(connection); to create an EGLSurface
you'd eglCreateWindowSurface(render_surface, ...).
I'm not sure if this is worth doing, but it does not appear that it
would be terribly difficult to do.
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