graphics interface design

Say in main.c we have the main loop that is something like

void gameloop(void) {
    getinput();
    ...
    drawEverythingThereistodraw();
}

(No, this is not how my code actually looks like). Over in video.c we have

void initVideo(void) {
    ...
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, 1.0, 1.5, 20.0);
}

void drawEverythingThereistodraw(void) {
    ...
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(...);
    // draw all the crap here
    ...
}

Now there are potentially many files that need to get things drawn. For example entity.c might have a draw function to (very surprisingly) draw the entity. So how should I arrange things so that this single function drawEverythingThereistodraw(void) calls all the necessary draw functions which are defined in many different files. A simple obvious would be to store a collection of function pointers say like void (*drawitfunc)(/*parameters which need to be decided correctly the first time or else later problems*/); So in some sense this is a data structure design question I guess. Then in drawEverythingThereistodraw I could just go through all the function pointers and call the draw functions they point to. In any event somehow all these draw calls need to be call through a single point it just makes sense that way I can''t see how you would organize your code in a different way that would be good.

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