Re: [Plib-devel] ssg states followup

[Curtis L. O. <cu...@me...>]

"Curtis L. Olson" wrote:
> > Ok, one more question.  Is it legal to use ssgSimpleStates to control
> > *all* the states that you can glEnable and glDisable?  I'm thinking
> > about things like GL_FOG, GL_DEPTH_TEST, GL_CULL_FACE, etc.

Steve Baker writes:
> No - I had great heartache over that.  I decided to stick to those
> states that you are likely to want to set and unset rapidly in a
> 'typical' application.  That keeps to a minimum the amount of state
> *testing* for each leaf node as it's rendered.
> 
> It would be a pretty weird application that needed to switch
> Fog and Depth-test on a per-leaf-node basis.

The place where I'm running into this is with drawing the skydome,
stars, sun, moon, etc.  I'm half modelling and half illusioning so I
need to play some tricks.  But, it's not a big deal.  As long as I
understand exactly what ssg does / doesn't, I can make things work.

> Of course GL_CULL_FACE is set per ssgLeaf node - so you don't want
> to mess with ssgState's for that.

Ok, so the best I can tell from the documentation, here is the
complete enumeration (internal names) of the states that ssg can
control:

  SSG_GL_TEXTURE_EN
  SSG_GL_CULL_FACE_EN
  SSG_GL_COLOR_MATERIAL_EN
  SSG_GL_BLEND_EN
  SSG_GL_ALPHA_TEST_EN
  SSG_GL_LIGHTING_EN

Is this the complete list of modes ssg can control?

Thanks,

Curt.
-- 
Curtis Olson   University of MN, ME Dept.       Flight Gear Project
Twin Cities    cu...@me...                  cu...@fl...
Minnesota      http://www.menet.umn.edu/~curt   http://www.flightgear.org