[Interest] QOpenGLWidget and text

[Till Oliver Knoll]

> Am 06.04.2015 um 17:15 schrieb Matthew Woehlke <mw_triad at users.sourceforge.net>:
> 
>> On 2015-04-04 05:57, Till Oliver Knoll wrote:
>>> Am 03.04.2015 um 17:26 schrieb Matthew Woehlke:
>>>> On 2015-04-02 13:45, Till Oliver Knoll wrote:
>>>> ..... But what's next? A "drawButton"? "drawBitmap"? In a Widget?!
>>> 
>>> Yes. And why not?
>> 
>> Because the class name sais *Widget, and not *Painter or *WhateverItem.
>> 
>> A Widget's responsibility - much like the one of a View; we'll come to that in a second... - is to provide a /surface/ to draw onto, and to manage the underlying system resources (we'll deliberately skip over other functionality, such as layout management).
> 
> Please don't be overly pedantic. The point isn't whether the ability is
> particularly a member of QOpenGLWidget, but whether it is available *at
> all* (in a non-deprecated class, anyway) without the user having to
> concoct a complicated system for providing it.

Sorry, my bad then. I thought the whole discussion was /exactly/ about bringing back renderText() to the new class QOpenGLWidget.

You: "I am finding myself less than
convinced that the new class is an improvement... implicit context
sharing is nice, but the loss of convenience methods is really, really
painful."

So I concluded that you must have been talking about QOpenGLWidget (alone).

Off course I never argued against the usefulness of said renderText (and /yes/, I missed the overload which takes world coordinates ;)).

I was merely defending the position that QOpenGLWidget is not the place for it, and that it was hence a good decision to drop it there.

As for the question where to place it: anywhere but *Widget!

Heck, it'd consider any "drawWhatever" functionality "high-level", read: "does not belong into Qt core OpenGL functionality", but rather another module: something between QtGui and Qt3d (or in the later itself).

The "Qt core OpenGL" functionality should just provide a surface to draw raw OpenGL into, a GL context and some convenience methods to convert Qt data structures (e.g. QImage) into "GL compatible buffer data". QMatrix and friends is nice, too.

Cheers,
  Oliver