Hello Johannes,
On Fri, Feb 7, 2014 at 11:31 AM, Johannes Brunen <jbru...@datasolid.de> wrote:
> has there been any development, thinking etc. about uniform blocks
> according to the ARB_uniform_buffer_object extension?
not on my end, sorry.
> How could that be implemented in OpenSG?
> Are there any fundamental obstacles in the context of OpenSG?
Hmm, one thing that distinguishes buffer objects used to back uniform
blocks from other uses (in OpenSG), is that they do not contain a
large amount of data of *the same type* - i.e. for VBOs you usually
have large chunks of say vec3/4 for positions/normals etc. while for a
uniform block you'll get much more varied types depending on what kind
of information needs to be passed to your shader. The same type case
maps nicely to MField<T> so we can represent such buffers as arrays of
some type T. I don't immediately have an idea what would be a good way
to represent the mixed type case (and the alignment issues it brings
with it [1]), suggestions would be welcome.
> For me that seems to be the correct tool for shader/uniform management.
I think they are good for cases where you have a number of uniforms
that only change from frame to frame (as opposed to between objects)
and need to be passed to multiple shaders - I understand that could
well be your use case ;)
Cheers,
Carsten
[1] I'd think it would be reasonable to only support uniform blocks
that have layout(std140) to simplify this a bit.
------------------------------------------------------------------------------
Managing the Performance of Cloud-Based Applications
Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
Read the Whitepaper.
http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk
_______________________________________________
Opensg-users mailing list
Opensg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/opensg-users
