code/Chapter08/InputSystem.h at 59edad40f33be9d247bab1007d38d496668d9206 · pascalcpp/code

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// ----------------------------------------------------------------

// From Game Programming in C++ by Sanjay Madhav

// Released under the BSD License

// See LICENSE in root directory for full details.

// ----------------------------------------------------------------

#pragma once

#include <SDL/SDL_scancode.h>

// The different button states

enum ButtonState

{

ENone,

EPressed,

EReleased,

EHeld

};

// Helper for Keyboard input

class KeyboardState

{

public:

// Friend so InputSystem can easily update it

friend class InputSystem;

// Get just the boolean true/false value of key

bool GetKeyValue(int keyCode) const;

// Get a state based on current and previous frame

ButtonState GetKeyState(int keyCode) const;

private:

const Uint8* mCurrState;

Uint8 mPrevState[SDL_NUM_SCANCODES];

};

// Wrapper that contains current state of input

struct InputState

{

KeyboardState Keyboard;

};

class InputSystem

{

public:

bool Initialize();

void Shutdown();

// Called right before SDL_PollEvents loop

void PrepareForUpdate();

// Called after SDL_PollEvents loop

void Update();

const InputState& GetState() const { return mState; }

private:

InputState mState;

};

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