input.h

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#pragma once
#include <cstdint>
 
#if SAMURAI_SDL
#include <SDL.h>
#include "backends/imgui_impl_sdl2.h"
#endif
 
#define INPUT_ADD_FLAG(NAME, SETNAME, VALUE)    \
    bool NAME() const {return (flags & ((std::uint32_t)1<<VALUE)); } \
    void SETNAME(bool s) { \
        if (s) { flags = flags | ((std::uint32_t)1 << VALUE); } \
            else { flags = flags & ~((std::uint32_t)1 << VALUE); }  \
        }
    
 
namespace samurai
{
 
 
    struct Button
    {
        //internal use only
        float timer = 0;
 
        //internal use only
        std::uint32_t flags = 0;
 
        //true in the first frame the key is pressed
        INPUT_ADD_FLAG(pressed, setPressed, 0);
 
        //true while the key is held
        INPUT_ADD_FLAG(held, setHeld, 1);
    
        //true in the frame the key is released
        INPUT_ADD_FLAG(released, setReleased, 2);
 
        //true in the first frame is pressed then after a pause true every few milliseconds
        INPUT_ADD_FLAG(typed, setTyped, 3);
 
        //true if the key is double pressed (true only for one frame, 3 presses would yield only one frame of this being true)
        INPUT_ADD_FLAG(doublePressed, setDoublePressed, 4);
 
        //last state of the button (last frame)
        INPUT_ADD_FLAG(lastState, setLastState, 5);
 
        enum
        {
            A = 0,
            B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z,
            NR0, NR1, NR2, NR3, NR4, NR5, NR6, NR7, NR8, NR9,
            Space, Enter, Escape,
            Up, Down, Left, Right,
            LeftCtrl, Tab, LeftAlt,
            BUTTONS_COUNT, //
        };
    };
 
    struct Input
    {
        //typed input doesn't work with mouse buttons
        Button lMouse = {};
        Button rMouse = {};
 
        //mouse position relative to window
        int mouseX = 0;
        int mouseY = 0;
 
        Button buttons[Button::BUTTONS_COUNT] = {};
        
        char typedInput[20] = {};
 
        //focus is here because it makes sense for the replay
        bool hasFocus = 0;
 
        float deltaTime = 0;
#if SAMURAI_SDL
        void listen();
 
#endif
    };
 
#if SAMURAI_SDL
    inline void Input::listen()
    {
        SDL_Event e;
        while (SDL_PollEvent(&e))
        {
            ImGui_ImplSDL2_ProcessEvent(&e);
            switch (e.type)
            {
            case SDL_QUIT: SDL_Quit();
                break;
            case SDL_KEYDOWN:
 
                break;
            case SDL_KEYUP:
 
                break;
            case SDL_MOUSEBUTTONDOWN:
                if (e.button.button == SDL_BUTTON_LEFT)
                {
                    lMouse.setPressed(true);
                    lMouse.setHeld(true);
                }
                else if (e.button.button == SDL_BUTTON_RIGHT)
                {
                    rMouse.setPressed(true);
                    rMouse.setHeld(true);
                }
                break;
            case SDL_MOUSEBUTTONUP:
                if (e.button.button == SDL_BUTTON_LEFT)
                {
                    lMouse.setReleased(true);
                    lMouse.setHeld(false);
                }
                else if (e.button.button == SDL_BUTTON_RIGHT)
                {
                    rMouse.setReleased(true);
                    rMouse.setHeld(false);
                }
                break;
            case SDL_MOUSEMOTION:
                mouseX = e.motion.x;
                mouseY = e.motion.y;
                break;
            default:
                break;
            }
        }
    }
#endif
 
};
 
 
 
#undef INPUT_ADD_FLAG