Re: [PyOpenGL-Devel] Test program?

[Ian M. <ia...@ge...>]

On Tue, May 27, 2014 at 3:44 AM, Sam Bull <sam...@se...> wrote:

> On lun, 2014-05-26 at 23:10 -0700, Ian Mallett wrote:
> > I spot-checked it just now: there are three chapters dedicated to (now
> > completely) deprecated APIs (inc. display lists and GLU). What they
> > did have of GL​ 3, 4 functionality still used deprecated APIs
> > (glVertex3f, etc.). My guess is that the current edition continues the
> > trend, leaving a lot of legacy cruft in there.
>
> Fortunately, you're wrong. The book has never mentioned display lists,
> glVertex3f and the like. The book approaches it as this is the new-style
> OpenGL, it's all shaders, VBOs etc., we're not going to look at
> old-style (which is probably why it took so long for them to rewrite
> this edition). The whole book is focused on how to use OpenGL 3.3-4.3,
> and doesn't even look at old style OpenGL anymore.
> ​​
>
> ​Oooo excellent. I might be able to recommend it again. Thanks.
​


> So, with the new style, as I understand it, it's not even possible to
> use the old OpenGL 2 pipeline (which is why it's not really mentioned in
> the book anymore). For example, you need a basic shader to draw even the
> most primitive shape, you can't use glVertex3f() etc. to draw a simple
> shape, you would have to use a VBO and shader.
>
​Correct. ​With, say, a GL 4 context, although it's not a GL error to call
into deprecated APIs (it just might not do as you expect; in my experience
it has no effect), it will be reported as a "high severity" error if you
created the context as a debug context (which, if you're using C-level
APIs, you should do).

Ian