low framerate problem

[Vincent22]

Hi, I have a problem with my game.
After playing for several minutes framerate goes to low.

I've tried playing in a simple scene: 3d model draw with VBO, no collisions, simple level e no other objects and I have the same problem.
Some suggests?

Maybe something wrong with my "main" file?

main.cpp:


void display();
void animate();
void reshape(int width, int height);
void mouseFunc(int,int,int,int);
void keyboardFunc(unsigned char, int, int);
void specialKeyboardFunc(int, int, int);
void changeScene();




GameScene *game;
StartMenu *start;
SelectionScene *selection;


extern State CURRENTSTATE;


int main (int argc, char ** argv)
{
myWindow window1;
window1.init(argc, argv);

StartMenu s;
SelectionScene sl;
GameScene g;
Debug d;

start = &s;
selection = &sl;
game = &g;





glutReshapeFunc(reshape);
window1.render(&display);
window1.mouse(&mouseFunc);
window1.keyboard(&keyboardFunc);
window1.specialKeyboard(&specialKeyboardFunc);
game->setTime(glutGet(GLUT_ELAPSED_TIME));
glutIdleFunc(&animate);

glutMainLoop();

return 0;
}



void display()
{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glLoadIdentity();




switch (CURRENTSTATE) {
case STARTMENU:
if(start->initialize()) {
start->render();
}
break;
case SELECTION:
if(selection->initialize()) {
selection->render();
}
break;
case GAME:
if(game->initialize()) {
game->render();
}
break;
default:
exit(1);
}



glutSwapBuffers();

}


void reshape(int width, int height)
{
switch (CURRENTSTATE) {
case STARTMENU:
start->reshape(width, height);
break;

case SELECTION:
{
SelectionScene selection;
selection.reshape(width, height);
break;
}
case GAME:
game->reshape(width, height);
break;
case DEB:
// debug->reshape(width, height);
break;
default:
exit(1);
}

}


void animate()
{
switch (CURRENTSTATE) {
case SELECTION:
{
selection->animate();
break;
}
case GAME:
game->animate();
break;
case DEB:
// debug->animate();
break;
default:
break;
}



}


void mouseFunc(int btn, int state, int x, int y)
{
switch (CURRENTSTATE) {
case STARTMENU:
start->mouse(btn, state, x, y);
break;

case SELECTION:
selection->mouse(btn, state, x, y);
break;

case GAME:
game->mouse(btn, state, x, y);
break;

default:
break;
}



}


void keyboardFunc(unsigned char key, int x, int y)
{
switch (CURRENTSTATE) {

case GAME:
game->keyboard(key, x, y);
break;

default:
break;
}


}

[V-man]

Usually, people who have this problem, I point them to the Common Mistakes page.
http://www.opengl.org/wiki/Common_Mistakes#glGenTextures_in_render_function

PS: there is no point in showing us you are calling selection->animate() start->render() and such functions.