KeyState.h

#ifndef _KEYSTATE_H_
#define _KEYSTATE_H_

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

static class KeyState
{

private:
        struct Keys
        {
            BitSet * m_keyVal;
            BitSet * m_keyState;
        };

    static Keys * s_inst;

public:
    //constructs and destructs,
    KeyState(void)
    {
        s_inst = new Keys;
        s_inst->m_keyVal = new BitSet(GLFW_KEY_LAST);
        s_inst->m_keyState = new BitSet(GLFW_KEY_LAST);
        glfwSetKeyCallback(KeyState::UpdateSingle);
    }

    ~KeyState(void) { delete s_inst->m_keyVal; delete s_inst->m_keyState; glfwSetKeyCallback(NULL); }

    static void GLFWCALL UpdateSingle(int key, int val)
    {
        //update values
        if(!(*(s_inst->m_keyState))[key] && !(*(s_inst->m_keyVal))[key])
        {
            if(glfwGetKey(key))
                s_inst->m_keyVal->SetBit(key);
        }
        else
            s_inst->m_keyVal->ClearBit(key);

        //update states
        if(glfwGetKey(key))
            s_inst->m_keyState->SetBit(key);
        else
            s_inst->m_keyState->ClearBit(key);
    }

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

};

KeyState::Keys* KeyState::s_inst = NULL;

#endif