KeyState.h

#ifndef _KEYSTATE_H_
#define _KEYSTATE_H_

#include "PaulMath.h"
#include "GL/glfw.h"

static class KeyState
{
private:
    //arrays
    static BitSet * m_keyVal;
    static BitSet * m_keyState;

    //key update
    static void GLFWCALL UpdateSingle(int key, int val)
    {
        //update value
        if(!(*(m_keyState))[key] && val)
            m_keyVal->SetBit(key);

        //update state
        if(val)
            m_keyState->SetBit(key);
        else
            m_keyState->ClearBit(key);
    }

public:
    //construct
    KeyState(void)
    {
        m_keyVal = new BitSet(GLFW_KEY_LAST);
        m_keyState = new BitSet(GLFW_KEY_LAST);
    }
    //destruct
    ~KeyState(void)
    {
        delete m_keyVal;
        delete m_keyState;
        glfwSetKeyCallback(NULL);
    }

    //needed to be done after GL init, so it works correctly
    void InitCallBack() { glfwSetKeyCallback(KeyState::UpdateSingle); }

    //call at end of every cycle to get desired logic
    void Clear() { m_keyVal->ClearAllBits(); }

    //for getting a key
    bool GetKey(const int key) const { return (*(m_keyVal))[key]; }

}KeyState;

//without these we get linker errors,
BitSet * KeyState::m_keyVal = NULL;
BitSet * KeyState::m_keyState = NULL;

#endif