Re: [Plib-users] using triangles

[Steve B. <sjb...@ai...>]

sa...@sa... wrote:

> I tried to parse everything out, except that triangle. It still didn't
> work. Here is code from that parsed version
> http://www.saunalahti.fi/~saparti/samitest.cpp

OK - I'll take a look at it.
 
> I still wonder, what would be a correct order when I have those ships
> and other things in there too.
> 
> Example:
> void redraw (){
>   update_motion () ;
>   glClear  ( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) ;
>   ssgCullAndDraw ( scene ) ;
>   glutPostRedisplay () ;
>   glutSwapBuffers () ;
> }
> 
> Should I put those raw opengl things between ssgCullAndDraw line and
> glutPostRedisplay line?

Yes.
 
> Is that glutSwapBuffers that command, which throw those raw opengl
> things to the screen? These might be some newbie guestions, but from
> somewhere everyone should start :)

The screen is a chunk of memory holding the pixels and the Z values - right?
Well, in OpenGL there are TWO chunks of pixel memory - one for the screen
that you are looking at on the CRT and the other for the one that you are
drawing into.  When you have completely finished drawing, the picture you
were drawing is swapped with the one you *were* looking at so now you are
looking at the new one and the old one is 'recycled' to be used as the
next place to draw into.

(That's an oversimplification - but not in any respect that matters)

----------------------------- Steve Baker -------------------------------
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