[Mesa-dev] Question about EGL_KHR_partial_update implementation

[Frank Binns]

Hi Qiang,

Qiang Yu <yuq825 at gmail.com> writes:

> Hi Harish,
>
> I want to implement EGL_KHR_partial_update for lima mesa driver and find you
> worked on Android/Wayland support for it:
> https://patchwork.freedesktop.org/patch/160944/
> https://patchwork.freedesktop.org/patch/188695/
>
> So I have some question about it:
> your implementation seems to depend on platform (Android, wayland) support,
> for example call native_window_set_surface_damage() in Android implementation.
> What's the purpose of it, tell the Android SurfaceFlinger to redraw the damage
> region? And is this damage region the "surface damage" or "buffer
> damage" metioned
> in the EGL_KHR_partial_update?
> https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_partial_update.txt
>
> To my understand this extension should only depend on the driver support instead
> of platform support while the EGL_KHR_swap_buffers_with_damage is the opposite:
> https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_swap_buffers_with_damage.txt
>

I came across this too and I agree with you. I think the current
implementation is incorrect and it should actually be passing the damage
rectangles to the driver.

Thanks
Frank

> For lima implementation, I want to use the damage region (buffer
> damage) provided
> by EGL_KHR_partial_update to skip rendering of un-damaged region when
> eglSwapBuffersXXX. And tell damage region (surface damage) to compositor should
> be left to eglSwapBuffersWithDamageKHR provided by
> EGL_KHR_swap_buffers_with_damage.
>
> Regards,
> Qiang
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