CODEWITHSUNDEEP
c++openglglut
user1075940
user1075940

Reputation: 1125

Pointer to function for glutDisplayFunc

I want to make 3 windows to represent rotation around the given axis. For that I made a class XYZAxis which contain function render. Next, from the main I call the function creatWindow which makes a GLUT window. However I don't know how to correctly pass function render to glutDisplayFunc :( fragment of main

void (XYZAxis::* pmf)(void);
pmf = &XYZAxis::render;

XYZAxis *xaxis=&XYZAxis(origin,5,10);


glutDisplayFunc( void(xaxis->*pmf)() ) ;
glutIdleFunc(void(xaxis->*pmf)());

and a function within XYZAxis class 

void render(void) 
{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();



this->orientation=this->orientation*(this->angle);
this->draw();

glutSwapBuffers();
}

the program compiles however when it reaches the glutMainLoop(); it throws an error and closes the window

GLUT: Warning in (unamed): The following is a new check for GLUT 3.0; update your code. GLUT: Fatal Error in (unamed): redisplay needed for window 1, but no display callback.

how to do it correctly?any ideas?

Upvotes: 0

Views: 585

Answers (1)

MK.
MK.

Reputation: 34537

I don't think you can pass a pointer to a C++ instance method to a C API like GLUT. You will need to wrap the method call in a C function using a global pointer to the instance you are interested in. See http://www.parashift.com/c++-faq-lite/pointers-to-members.html

Upvotes: 1

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