[waffle] [PATCH 0/2] Test and fix for EGL configs with alpha

[Chad Versace]

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On 05/24/2012 07:33 AM, Pauli Nieminen wrote:
> Only EGL configs [1] that are available with alpha are using 32bit composite
> visual. To create a window with that visual requires a bit more parameters
> than waffle  is currently providing. The fix is relatively simple 
> 
> I hit this with piglit tests using GLUT_ALPHA.
> 
> I don't actually know any reason why mesa doesn't provide alpha bits for
> 24bit X visuals. Application could still use framebuffer alpha bits for 
> rendering even tough compositor won't read those values. But I suppose
> that is topic of later discussion in mesa list.


Many weeks ago, when I was prototyping Waffle's X11/EGL backend, I
encountered this problem. When I moved from prototyping to actually
implementing, I forgot about it and never fixed it.

Thanks for rediscovering and solving this problem.

> Will waffle provide application control to select between opaque and
> translucent window even if selecting config with alpha bit?

I haven't decided yet. We first need to investigate what analogous functionality
exists on MacOS and Wayland.
 
> [1] example config:
> 0x3d 32  0  8  8  8  8  0  0  0 0 0x66TC      a  y  y  y     win,pb,pix
> 
> Pauli Nieminen (2):
>   gl_basic_test: Add test that config with alpha works
>   x11: Support visuals that don't match root visual
> 
>  src/waffle/x11/x11.c             |   23 ++++++++++++++++++++---
>  tests/functional/gl_basic_test.c |   31 ++++++++++++++++++++-----------
>  2 files changed, 40 insertions(+), 14 deletions(-)
> 



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