Constant Rotation with GUI.RotateAroundPivot

hello,

i have a texture that needs to rotate constantly since it's part of the loading screen.

this is my script:

 var sharkSpiral : Texture2D;
 var rCircle : Rect;
     
 function OnGUI()
 {
     var pivot : Vector2;
             
     pivot.x = rCircle.x+rCircle.width/2;
     pivot.y = rCircle.y+rCircle.height/2;
     
     var svMat : Matrix4x4 = GUI.matrix;
     GUI.DrawTexture(rCircle,sharkSpiral);
     GUIUtility.RotateAroundPivot(360,pivot);
     
     GUI.matrix = svMat;
     }

now, as far as i can see, the script is doing nothing. i can see the texture, but it doesn't rotate. i searched around for any help with GUI.RotateAroundPivot because i have the feeling that i'm missing something, but all the examples found online use the same code. i tried using another Vector2 as pivot and other random numbers for the angle, but it didn't change anything.

i also tried the code from this answer - if i change the angle in the editor it rotates for the exact amount (which is more than my code does), but it's not a constant movement.

maybe i'm misunderstanding GUI.RotateAroundPivot, but if i wanted to just rotate the texture for a bit, then i could do that in photoshop, right? no need for an extra script...

would be grateful for any help / clarification / pointers in the right direction, thanks in advance.