[Soc-2013-dev] Weekly Report 13-14 Viewport FX

[Jason Wilkins]

It is getting to a point where I can start experimenting with new
techniques, such as drawing wires and lighting in a single pass.  It is
quite a bit just to refactor things so that everything can be drawn using
GLSL, so that was my focus this summer.

Of note is that I have a 'basic' shader for drawing almost everything, but
also made a separate 'raster' shader for various deprecated line and
polygon raster features such as stippling.  Since these features are never
used with texturing or lighting I figured I'd factor them out to save on
complexity in the 'basic' shader (each new feature doubles the number of
combinations).

I didn't occur to me to combine them into a single pass, because that would
require reworking code at a higher level than I've been focused on, but
that is something I'd like to think about now.

Also, the wireframe isn't exactly one-to-one with the primitives used to
draw the solid, so it would actually be rather complicated to pass which
edges to draw into the shader (at least, it would require a lot of work to
rewrite it work right).




On Sat, Sep 21, 2013 at 1:40 AM, David Jeske <davidj at gmail.com> wrote:

> Thanks. For now I just want to read the code. I'm fishing through your
> branch now.
>
> On bf-funboard I recently I suggested we could probably get much better
> viewport performance for most machines by adding a single-pass OpenGL 2.1 /
> GLSL120+geometry_EXT draw-method, especially for draw_em_fancy.
>
> I did a little (non-blender) experiment, implementing
> single-pass-wireframes<http://strattonbrazil.blogspot.com/2011/09/single-pass-wireframe-rendering_10.html>in a GLSL-120 shader, and it was super easy to code and is super-fast. The
> technique is easily extendable to points, face-highlighting, and can
> trivially do things that are impossible with old fixed-function drawing.
> (such as dynamic wireframe color adjustment to maintain contrast) Not sure
> yet about outlines.
>
> I wondered if your viewport-fx consolidated into a single pass. If I
> understand what I'm seeing, it looks like it leaves all the passes in-fact.
>
>
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