Input.h

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#pragma once
 
#include "krpch.h"
 
#include "Karma/Log.h"
#include "Karma/Events/Event.h"
#include "Karma/Window.h"
#include "Karma/KarmaUtilities.h"
 
/*
    Input system need complete revamp in the sense to provide enough context for input maping
    and being able to work with specialized controller devices with minimal latency.
 
    Partial progress has been made towards that direction.
*/
 
 
namespace Karma
{
    enum class InputRegisteringAPI
    {
        None = 0,
        GlfwInput
    };

    struct InputData
    {
    };
 
    class KARMA_API GameAction
    {
    public:
        GameAction();
 
        // Getters
        const std::string& GetGAName() const { return m_ActionName; }
        const std::shared_ptr<void>& GetClassAction() const { return m_ClassAction; }
    private:
        // The class/object pointer, imparting the action
        std::shared_ptr<void> m_ClassAction;
        std::string m_ActionName;
    };
 
    class KARMA_API Button
    {
    public:
        Button();
 
        // Getters
        const int& GetButtonID() const { return m_ButtonID; }
    private:
        int m_ButtonID;
 
    };
 
    class KARMA_API ControllerDevice
    {
    public:
        ControllerDevice(int cID, const std::string& dName);
 
        void AddInputMapping();
 
        // Getters
        const int& GetControllerID() const { return m_ControllerID; }
        const std::string& GetDeviceName() const { return m_DeviceName; }
 
    private:
        std::unordered_map<std::shared_ptr<Button>, std::shared_ptr<GameAction>> m_InputMapping;
        int m_ControllerID;
        std::string m_DeviceName;
        bool m_IsGamePad;
    };

    class KARMA_API Input
    {
    public:
        Input(InputData& inputDatRef);

        ~Input();

        inline static bool IsKeyPressed(int keycode)
        {
            return s_Instance->IsKeyPressedImpl(keycode);
        }

        inline static bool IsMouseButtonPressed(int button)
        {
            return s_Instance->IsMouseButtonPressedImpl(button);
        }

        inline static bool IsMouseButtonReleased(int button)
        {
            return s_Instance->IsMouseButtonReleasedImpl(button);
        }

        inline static bool IsControllerButtonPressed(int button, int cID)
        {
            return s_Instance->IsControllerButtonPressedImpl(button, cID);
        }

        inline static float ControllerAxisPivotVal(int axis, int cID)
        {
            return s_Instance->ControllerAxisPivotValImpl(axis, cID);
        }

        inline static std::pair<float, float>GetMousePosition()
        {
            return s_Instance->GetMousePositionImpl();
        }

        inline static float GetMouseX()
        {
            return s_Instance->GetMouseXImpl();
        }

        inline static float GetMouseY()
        {
            return s_Instance->GetMouseYImpl();
        }

        inline static InputRegisteringAPI GetAPI() { return s_InputAPI; }

        inline static void DeInit()
        {
            KR_CORE_INFO("Shutting down input system");
        }

        static void Init();

        static std::shared_ptr<Input> GetInputInstance() { return s_Instance; }
 
        using EventCallbackFn = std::function<void(Event&)>;

        virtual void SetEventCallback(const EventCallbackFn& callback, Window* window) = 0;

        void SetGamepadMapping();
 
        // Debug purposes
        static void DisplayControllerDevices();
 
    protected:
        virtual bool IsKeyPressedImpl(int keycode) = 0;

        virtual bool IsMouseButtonPressedImpl(int button) = 0;

        virtual bool IsMouseButtonReleasedImpl(int button) = 0;

        virtual bool IsControllerButtonPressedImpl(int button, int cID) = 0;

        virtual float ControllerAxisPivotValImpl(int axis, int cID) = 0;

        virtual std::pair<float, float> GetMousePositionImpl() = 0;

        virtual float GetMouseXImpl() = 0;

        virtual float GetMouseYImpl() = 0;
 
        // GLFW specific
        static void SetConnectedJoySticks();
 
        // Getters
        const std::list<std::shared_ptr<ControllerDevice>>& GetControllerDevices() const { return m_ControllerDevices; }

        void AddControllerDevice(std::shared_ptr<ControllerDevice> device);
 
    private:
        static InputRegisteringAPI s_InputAPI;
        static std::shared_ptr<Input> s_Instance;
 
    protected:
        static std::list<std::shared_ptr<ControllerDevice>> m_ControllerDevices;
    };
}