Yet Another Camera Class. [YACC]

2

small optimizations

You use Keyboard.GetState() all over again - for each key actually. Same for Mouse.GetState().
That’s not great, since it doesn’t get cached in the background.

So you should save it to _currentState at the beginning of your update loop and use that value then.

If you want to see for yourself
this will make your program come to a complete halt

for (int i = 0; i<10000;i++)
            keyboardState = Keyboard.GetState();

this will not change a thing

    KeyboardState keyboardState2 = Keyboard.GetState();

    for (int i = 0; i < 10000; i++)
        keyboardState = keyboardState2;

If you have a million objects that need to be transformed each frame there is another thing you want to optimize is this:

public Matrix GetWorldViewProjection(WorldSpaceObject worldObject)
            {
                return worldObject.world * viewSpace * projection;
            }

the viewSpace * projection matrix multiplication is always the same, just calculate that when calculating view and use

return worldObject.world * viewSpaceProjection;

instead

Transformation between systems