I'm not sure about the Python interface, but a zero offset for glVertexAttribPointer means "from the beginning", not "no offset". So None does not make sense here. Offset could be made 0 by default since that's a pretty common case.
Since Blender uses VBOs mostly and is moving more toward that direction this should be an unsigned integer offset in the API. The old interpretation of a main-memory pointer will be going away. Mike Erwin musician, naturalist, pixel pusher, hacker extraordinaire On Mon, Feb 29, 2016 at 2:26 AM, Quentin Wenger <ma...@protonmail.ch> wrote: > Hi, > > [not sure this best belongs to bf-committers or bf-python...] > > I am currently developping an addon making heavy use of OpenGL/bgl (and > BTW gpu.offscreen, which seems to do exactly what I was lacking for in > terms of Framebuffers... thanks Dalai & reviewers!). > > Still there is one only thing that seems not to work for me: > bgl.glVertexAttribPointer. Reason for that is, I would use (void*)0 (or > NULL maybe) as the last parameter in equivalent OpenGL/C code, that last > parameter representing an offset in the buffer, which seems not to be > possible currently with bgl.Buffer. > > So I thought I'd need to implement a kind of special bgl.Buffer (maybe > stored as a variable in bgl or even, static in bgl.Buffer) internally > mapping to (void*)0 or NULL. But then I realized it could sometimes be > helpful to specify other offsets, say (void*)4, etc. > > At this point I decided it would be better to ask more people before > diving in the code. ;-) > > So, what do you think about that? Do you know about a workaround in bgl? > Is the implementation of special bgl.Buffer a possibility? > > Note that I do have a temporary workaround - > OpenGL.GL.glVertexAttribPointer(..., ctypes.c_void_p(None)) in the middle > of bgl code - but that's not very nice, uses external package, etc. > Moreover, without such as special bgl.Buffer or any similar alternative the > function bgl.glVertexAttribPointer simply is mostly useless. > > Thanks, > Quentin > _______________________________________________ > Bf-committers mailing list > Bf-committers@blender.org > http://lists.blender.org/mailman/listinfo/bf-committers > _______________________________________________ Bf-committers mailing list Bf-committers@blender.org http://lists.blender.org/mailman/listinfo/bf-committers