[GEM-dev] gemwin

[IOhannes m zmoelnig]

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On 2014-08-19 18:11, Cyrille Henry wrote:
> hello,
> 
> i just tested the current Gem git. (i'm still using on ubuntu linux
> 14.04, intel hd4000)
> 
> gemwin did not create. Gem/gemdefaultwindow can be created. it use
> gemglxwindow. (i have both gemglutwindow.pd_linux and
> gemglxwindow.pd_linux in /usr/local/lib/pd/extra/Gem)
> 
> sending the create message on this object did create an empty
> window. but sending "1" did not enable rendering, i only get : 
> gemglxwindow: no method for 'float'
> 
> so : why did gemdefaultwindow is not named gemwin?

that's by design.

> (sould i just make a symlink?)

no. [gemwin] and [gem*window] are *not* the same.


> more important : how can i enable rendering?


the design is obviously different from what you expect.

[gemdefaultwindow] (or rather it's underlying implementations like
[gemglxwindow] or [gemglutwindow]) is really just a very thin wrapper
around an openGL-context.
all it can do is to create/destroy an openGL-context (aka window), and
make that context the "current" one (so any openGL commands are
exectuted within this context).

it does a lot less than [gemwin], which handles viewpoints, rendering,...

short overview:

starting with Gem-0.94 (that is: current git), [gemwin] is now an
abstraction (found in abstractions/).
internally it uses [gemdefaultwindow] to create/destroy/switch-to
windows/contexts, which is just another abstraction that wraps the
actual implementation (e.g. [gemglfw3window]), but you really need the
entire [gemwin] abstraction to use Gem as you used to.

apart from separating platform-independent code (as found in the
[gemwin] abstraction) and platfrom-dependent code (the actual
[gem*window] backend), this also allows the user to change the
behaviour of [gemwin] without needing a compiler.

conclusion:
add abstractions/ to your path, so you have a proper [gemwin].

fgmasdr
IOhannes
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