Re: [Gnash-dev] Simple tasks for OpenGL and Cairo to allow automated testing

[Quinn Storm]

On Wednesday 06 June 2007 05:33:18 strk wrote:
> On Wed, Jun 06, 2007 at 05:25:34AM -0400, Quinn Storm wrote:
> > On Wednesday 06 June 2007 05:17:30 strk wrote:
> > > After a bried talk with Quinn and others on #gnash I took note
> > > about some pointers with possible solutions to the "offline rendering"
> > > for opengl problem:
> > >
> > > http://gnashdev.org/wiki/index.php/MovieTester#OpenGL_offscreen_renderi
> > >ng
> > >
> > > It seems to me (but I'm really a newbie in ogl world) that using the
> > > mesa implementation it would be possible to render to an offscreen
> > > buffer and thus using this feature for testing. Of course we can't test
> > > timing, but we don't do already (we just check correctness).
> > >
> > > Quinn, can you confirm this is possible ?
> >
> > This would be *possible* (with libosmesa), but the obvious problem is we
> > could end up using openGL features that don't render properly on
> > everyone's driver anyway (despite openGL being a standard, etc.,
> > implementations are buggy, c.f. standards like ACPI, etc.)  I'm not
> > against it in principle, just want to point out the bugs that can happen
> > with it.
>
> Do you mean we'd need to use *different* functions from the ones we already
> use for the sole purpose of implementing offscreen buffer rendering ?
>
> --strk;

Probably (I hope) just a different 'glue' code, but what I was referring to is 
if we only ever test things against offscreen rendering, we are liable easily 
to run into bugs with various implementations of GL in the 'real world' case 
(on hardware as opposed to offscreen software rendering)