[glut] mouselook

OpenGL
1

How can I do mouselook with glut? I can’t get it to work with SDL…

2

Neither SDL or glut does mouselook automatically.
You have to read the mouse coordinates manually and then apply them using glRotate.

3

I know that already, I don’t know how to do it and require assistance.

This is what I came up with (SDL)

void MouseUpdate() {
	static int old_x, old_y;
	int x, y;
	SDL_GetRelativeMouseState(&x,&y);

	SDL_WarpMouse(r_width/2,r_height/2);

	CamYaw+=x;
	CamPitch+=y;

	old_x=x;
	old_y=y;

	if(CamPitch<-90)
		CamPitch=-90;

	if(CamPitch>90)
		CamPitch=90;

}
4

A long time ago (well in february) i coded an arkanoid3D using opengGL with SDL…

Here’s how i did in pseudo code :



SDL_Event event;

int main()
{
  //Some initialization here
  while (42) // Main loop where you update graphical content
   {
     while (SDL_PollEvent(&event))
       //keyboards input here
       ;
   }
  return (0);
}

With PollEvent you get the events associated with your mouse and keyboard.

The mouse events are in event.motion.x and event.motion.y

Hope this will help you !

5

lol

yeah I know there are mousemotion events but that’s not what I need for mouselook afaik

6

So what is your problem? Did you succeed to get your mouse xy motion values?

Are your camPitch and camYaw variables correct?

7

No:

if the camera is rotated -20 it instantly rotates +20 again… :frowning:

8

I don’t know SDL… :frowning: I can’t help you about this until this not an opengl problem. You have to make your angle values correct before.

9

You can try to print each frame your camera angle, or best, after each function, you’ll rapidly trace when it is changed ^^

It’s always a great way to debug,
if it doesn’t work try to paste your code, luckly you’ll see when is the mistake (:

10

Dear Kitty! Why 42?

Edit: ah, of course… me idiot…

11

fixed

void MouseUpdate() {
	int x, y;
	SDL_GetMouseState(&x,&y);
	SDL_WarpMouse(r_width/2,r_height/2);

	CamYaw+=(x-r_width/2)*0.2;
	CamPitch+=(y-r_height/2)*0.2;

	if(CamPitch<-90) {
		CamPitch=-90;
	}

	if(CamPitch>90) {
		CamPitch=90;
	}
}

google: sdl mouse look opengl SDL_GetMouseState camera