smack-a-brother/src/input.h

#pragma once

#include "common.h"
#include <vector>

class Fighter;
struct Game;
struct SDL_Gamepad;
struct SDL_Joystick;

constexpr int KEY_COUNT = 512;
constexpr int TYPED_LENGTH = 64;

enum Control
{
    CONTROL_LEFT,
    CONTROL_RIGHT,
    CONTROL_UP,
    CONTROL_DOWN,
    CONTROL_JUMP,
    CONTROL_ATTACK,
    CONTROL_CHARGE,
    CONTROL_LEVEL_DOWN,
    CONTROL_LEVEL_UP,
    CONTROL_READY,
    CONTROL_NEXT_WEAPON,
    CONTROL_PREVIOUS_WEAPON,
    CONTROL_MENU,
    CONTROL_CHAT,
    CONTROL_COUNT
};

// What each control is called in the Controls settings, and its key in settings.txt.
constexpr const char* CONTROL_NAMES[CONTROL_COUNT] = {
    "Move Left",   "Move Right",      "Up",   "Down", "Jump", "Attack", "Charge", "Level Down", "Level Up", "Ready",
    "Next Weapon", "Previous Weapon", "Menu", "Chat"};
constexpr const char* CONTROL_KEYS[CONTROL_COUNT] = {
    "left",        "right",           "up",   "down", "jump", "attack", "charge", "level_down", "level_up", "ready",
    "next_weapon", "previous_weapon", "menu", "chat"};

// One tick of a fighter's intent, from the keyboard, a gamepad or a bot. Buttons holds a bit per Control held this
// tick, cursor is the world point it aims at, slot is a weapon slot to switch to (-1 for none), and edit a change to
// its loadout or settings made from the menu this tick (see edit_encode, -1 for none).
struct Controls
{
    Vec2 cursor;
    Uint16 buttons = 0;
    int edit = -1;
    int slot = -1;
};

constexpr int EDIT_QUEUE = 16;

enum MouseButton
{
    MOUSE_LEFT,
    MOUSE_RIGHT,
    MOUSE_MIDDLE,
    MOUSE_COUNT
};

// Which half of a binding: the keyboard side or the gamepad side.
enum BindingSide
{
    SIDE_KEY,
    SIDE_PAD
};

// A control's two bindings: one on the keyboard side (a key's scancode, or past the keys a mouse button or wheel
// direction) and one on the gamepad (a button, or past the buttons a stick or trigger direction). -1 is unbound.
struct Binding
{
    int key = -1;
    int pad = -1;

    int& side_get(BindingSide side)
    {
        return side == SIDE_PAD ? pad : key;
    }
};

constexpr int PAD_MAX = 4;
constexpr int DEVICE_NONE = -1;
constexpr int DEVICE_KEYBOARD = 0;
constexpr int DEVICE_COUNT = PAD_MAX + 1;
constexpr int PAD_AXES = 6;

// Menu navigation directions, as bits.
enum Nav
{
    NAV_UP = 1,
    NAV_DOWN = 2,
    NAV_LEFT = 4,
    NAV_RIGHT = 8
};

// One step of the test gamepad script: at time seconds, pad's button (or axis) index goes to value.
struct PadEvent
{
    float time = 0;
    float value = 0;
    int index = 0;
    int pad = 0;
    bool isAxis = false;
};

// One way of playing: the keyboard and mouse, or a gamepad. Previous is what its controls were last tick (for
// presses), stick the last way its right stick leaned, pick a Choice pick and ready a Ready click waiting for the next
// tick, presses the gamepad buttons pressed since the last poll (for menus) and taps those pressed since the last
// tick (held for it, however quick). Nav is the menu directions pressed since the last poll (D-pad, left stick or
// arrow keys, repeating while held), held the D-pad and left stick directions held, and repeat when they next repeat.
// Down and axes are the gamepad's buttons held and sticks and triggers (-1 to 1) as of the last poll, which bindings
// read so a replayed tick sees the gamepad as it was.
struct Device
{
    SDL_Gamepad* pad = nullptr;
    Vec2 stick = {1, 0};
    Uint64 repeat = 0;
    float axes[PAD_AXES] = {};
    Uint32 down = 0;
    Uint32 presses = 0;
    Uint32 taps = 0;
    int held = 0;
    int nav = 0;
    // Edits waiting to go out, one per tick, oldest first.
    int edits[EDIT_QUEUE] = {};
    int editCount = 0;
    bool previous[CONTROL_COUNT] = {};
    bool isAiming = false;
    bool isClaimed = false;
    bool isReady = false;
};

// Per-frame keyboard, mouse and gamepad state. Edges persist until a tick consumes them with tick_end. Menus read it
// directly, and gameplay only sees it turned into Controls through the bindings, per device: the keyboard and mouse
// (which also take any gamepad no one has claimed), or a claimed gamepad. Mouse is in canvas pixels. Widgets drawn
// every frame use the per-frame parts instead: whether the left button was clicked since the last poll, and while a
// text field has the keyboard, the text typed, backspaces and whether Enter or Escape ended it, and scroll, the wheel
// turned since the last poll (wheel is the same for ticks, kept until one ends), whether the mouse moved, and whether
// Enter was pressed outside typing (confirming in menus). Play request is the menu's Play button, waiting for the next
// tick to start the game. Clicks, keys and buttons come from
// press events too, so one let go quicker than a frame or tick still counts. Typing hides every key from the game. F
// toggles fullscreen whenever nothing is being typed. A gamepad's right stick aims while it's in use (for the
// keyboard's device, until the mouse moves). Capture listens for the next input on one side of a control's binding
// (Escape cancels), which then doesn't count as pressed. RPG_TEST_PADS names a script of virtual gamepad presses for
// testing ("seconds pad button|axis index value" a line).
class Input
{
public:
    Binding bindings[CONTROL_COUNT];
    Device devices[DEVICE_COUNT];
    // How far a right stick must lean before it aims (see Settings::stickDeadzone).
    float aimDeadzone = 0.3f;
    Vec2 mouse;
    char typed[TYPED_LENGTH] = {};
    float scroll = 0;
    float wheel = 0;
    int captureControl = -1;
    int erases = 0;
    int slotPressed = -1;
    // A loadout picked with Shift and a number key, kept until the settings take it (they update once a frame).
    int loadoutPressed = -1;
    bool isBindingChanged = false;
    BindingSide captureSide = SIDE_KEY;
    bool isClicked = false;
    bool isConfirmed = false;
    bool isMouseMoved = false;
    bool isPlayRequested = false;
    bool isRightClicked = false;
    bool isQuit = false;
    bool isSubmitted = false;
    // Whether the text being typed was given up on (Escape) rather than entered.
    bool isCancelled = false;

    Input();
    void poll(Game& game);
    void tick_end();
    void bindings_reset();
    Controls controls_get(int device, Vec2 camera, Fighter& fighter, bool isMenuOpen);
    void edit_send(int device, int edit);
    Vec2 aim_get(int device, Vec2 camera, Vec2 origin);
    bool is_down(int scancode);
    bool is_pressed(int scancode);
    bool is_control_pressed(Control control);
    bool is_key_control_pressed(Control control);
    bool is_pad_pressed(int device, int button);
    Uint32 pad_presses_get(int device);
    bool is_pad_tapped(int button);
    int nav_get(int device);
    bool is_mouse_down(MouseButton button);
    bool is_mouse_pressed(MouseButton button);
    bool is_mouse_released(MouseButton button);
    void binding_name_get(int binding, BindingSide side, char* text, int size);
    void control_name_get(Control control, char* text, int size);
    void rumble_play(int device, float strength, Uint32 milliseconds);

    bool is_control_down(int device, Control control);

private:
    std::vector<PadEvent> script;
    std::vector<SDL_Joystick*> virtualPads;
    bool buttons[MOUSE_COUNT] = {};
    bool buttonsPrevious[MOUSE_COUNT] = {};
    bool keys[KEY_COUNT] = {};
    bool keysPrevious[KEY_COUNT] = {};
    bool keysTapped[KEY_COUNT] = {};
    bool presses[MOUSE_COUNT] = {};
    bool pressesUnticked[MOUSE_COUNT] = {};
    bool isSwallowed = false;
    bool wasTyping = false;

    bool is_key_binding_down(int binding);
    bool is_pad_binding_down(Device& device, int binding);
    void capture_take(int binding);
    void script_load();
    void script_play(Game& game);
};