Use QOpenGLFunctions_4_5_Core functions in an external file without declare a class

[aidoru]

Hello,
I would like to know if is it possibile to use OpenGL functions outside my glWidget class.
For example if I have an external header file like this:

//shader.hpp
#ifndef SHADER_HPP
#define SHADER_HPP

#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLFunctions_4_5_Core> 


GLuint MyShaders(const char * vertex_file_path, const char * fragment_file_path);

#endif

why I can`t use in cpp that:

#include "shader.hpp"

GLuint MyShaders(const char * vertex_file_path, const char * fragment_file_path){

	// Create the shaders
	GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
	GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
        .........................
        ......................

Visual Studio told me that glCreateShader identifier not found.

Thank you

[SGaist]

Hi,

QOpenGLFunctions_4_5_Core is a class not just a bunch of function to use. You have to inherit from it to use the functions it provides.

Note, I haven't used them outside QOpenGLWidget/Window.

[aidoru]

So I can only create/use my "MyShaders" function inside glwidget class?

[SGaist]

Your function must be integrated in a class that derives from QOpenGLFunctions_4_5_Core. Don't forget to handle the context properly.