CODEWITHSUNDEEP
openglqt4
Martin Drlík
Martin Drlík

Reputation: 1454

OpenGL Extensions in Qt 4

it's possible enable/use OpenGL (specific version) in Qt 4 (on Desktop) or I have to use glew, etc?

Upvotes: 1

Views: 1056

Answers (3)

Martin Drlík
Martin Drlík

Reputation: 1454

My way to do that (Windows)... You need www.opengl.org/registry/api/glext.h

I'm using this python script to generate glex.h (p_glext.h) and glex.cpp from glext.h

p_glext.h is copy of glext.h without prototypes.

//glex.h
#ifndef GLEX_H
#define GLEX_H

#include "p_glext.h"

extern void glexInit();
extern PFNGLBLENDCOLORPROC glBlendColor;
extern PFNGLBLENDEQUATIONPROC glBlendEquation;
extern PFNGLDRAWRANGEELEMENTSPROC glDrawRangeElements;
...

//glex.cpp
...
void glexInit() {
    glBlendColor = (PFNGLBLENDCOLORPROC)wglGetProcAddress("glBlendColor");
    glBlendEquation = (PFNGLBLENDEQUATIONPROC)wglGetProcAddress("glBlendEquation");
    glDrawRangeElements = (PFNGLDRAWRANGEELEMENTSPROC)wglGetProcAddress("glDrawRangeElements");
...
}

that's simple enough to me

Upvotes: 0

David C. Bishop
David C. Bishop

Reputation: 6615

Rather than Glew you can include gl3.h, it's probably the simplest and most pain free way and works with compatibility mode as well as core. It's also well worth checking out GLXX it's a newer lib written in C++ so its more object orientated and provides handy functions for querying capabilities and so on.

You could look at manually binding just the extensions you need, possibly making your own Qt classes.

Other alternatives are Glee (A bit out of date now, only up to OpenGL 3.0) and gl3w (a script to generate header files for you, but only seems to support OpenGL 3/4 core).

Also if you want a object orientated library for OpenGL itself OGLplus looks good, doesn't do extensions though.

Upvotes: 1

Martin Beckett
Martin Beckett

Reputation: 96109

Qt has wrappers for some extentions like QPixelBuffers otherwise you can just use glew to enable the extentions

Upvotes: 0

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