cl_input.cpp

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/*
All original material Copyright (C) 2002-2020 UFO: Alien Invasion.

Original file from Quake 2 v3.21: quake2-2.31/client/cl_input.c
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "../client.h"
#include "cl_input.h"
#include "cl_keys.h"
#include "cl_joystick.h"
#include "../battlescape/cl_localentity.h"
#include "../battlescape/cl_hud.h"
#include "../cl_console.h"
#include "../cl_screen.h"
#include "../battlescape/cl_actor.h"
#include "../battlescape/cl_view.h"
#include "../battlescape/cl_parse.h"
#include "../ui/ui_main.h"
#include "../ui/ui_input.h"
#include "../ui/node/ui_node_abstractnode.h"
#include "../../shared/utf8.h"

#include "../../common/tracing.h"
#include "../renderer/r_misc.h"

/* power of two please */
#define MAX_KEYQ 64

#if SDL_VERSION_ATLEAST(2,0,0)
#define SDL_keysym SDL_Keysym
#endif

static struct {
    unsigned int key;
    unsigned short unicode;
    int down;
} keyq[MAX_KEYQ];

static int keyq_head = 0;
static int keyq_tail = 0;

static cvar_t* in_debug;
cvar_t* cl_isometric;

mouseSpace_t mouseSpace;
int mousePosX, mousePosY;
static int oldMousePosX, oldMousePosY;

static int battlescapeMouseDraggingX;
static int battlescapeMouseDraggingY;
static bool battlescapeMouseDraggingPossible, battlescapeMouseDraggingActive;
enum {
    BATTLESCAPE_MOUSE_DRAGGING_TRIGGER_X = VID_NORM_WIDTH / 10,
    BATTLESCAPE_MOUSE_DRAGGING_TRIGGER_Y = VID_NORM_HEIGHT / 10
};

/*
===============================================================================
KEY BUTTONS
===============================================================================
*/

typedef struct {
    int down[2];                
    unsigned downtime;          
    unsigned msec;              
    int state;                  
} kbutton_t;

static kbutton_t in_turnleft, in_turnright, in_shiftleft, in_shiftright;
static kbutton_t in_shiftup, in_shiftdown;
static kbutton_t in_zoomin, in_zoomout;
static kbutton_t in_turnup, in_turndown;
static kbutton_t in_pantilt;

static void IN_KeyDown (kbutton_t* b)
{
    int k;
    const char* c = Cmd_Argv(1);

    if (c[0])
        k = atoi(c);
    else
        /* typed manually at the console for continuous down */
        k = -1;

    /* repeating key */
    if (k == b->down[0] || k == b->down[1])
        return;

    if (!b->down[0])
        b->down[0] = k;
    else if (!b->down[1])
        b->down[1] = k;
    else {
        Com_Printf("Three keys down for a button!\n");
        return;
    }

    /* still down */
    if (b->state)
        return;

    /* save timestamp */
    c = Cmd_Argv(2);
    b->downtime = atoi(c);
    if (!b->downtime)
        b->downtime = CL_Milliseconds() - 100;

    /* down */
    b->state = 1;
}

static void IN_KeyUp (kbutton_t* b)
{
    int k;
    const char* c = Cmd_Argv(1);

    if (c[0])
        k = atoi(c);
    /* typed manually at the console, assume for unsticking, so clear all */
    else {
        b->down[0] = b->down[1] = 0;
        return;
    }

    if (b->down[0] == k)
        b->down[0] = 0;
    else if (b->down[1] == k)
        b->down[1] = 0;
    /* key up without corresponding down (menu pass through) */
    else
        return;

    /* some other key is still holding it down */
    if (b->down[0] || b->down[1])
        return;

    /* still up (this should not happen) */
    if (!b->state)
        return;

    /* save timestamp */
    c = Cmd_Argv(2);
    const unsigned uptime = atoi(c);
    if (uptime)
        b->msec = uptime - b->downtime;
    else
        b->msec = 10;

    /* now up */
    b->state = 0;
}

static void IN_TurnLeftDown_f (void)
{
    IN_KeyDown(&in_turnleft);
}
static void IN_TurnLeftUp_f (void)
{
    IN_KeyUp(&in_turnleft);
}
static void IN_TurnRightDown_f (void)
{
    IN_KeyDown(&in_turnright);
}
static void IN_TurnRightUp_f (void)
{
    IN_KeyUp(&in_turnright);
}
static void IN_TurnUpDown_f (void)
{
    IN_KeyDown(&in_turnup);
}
static void IN_TurnUpUp_f (void)
{
    IN_KeyUp(&in_turnup);
}
static void IN_TurnDownDown_f (void)
{
    IN_KeyDown(&in_turndown);
}
static void IN_TurnDownUp_f (void)
{
    IN_KeyUp(&in_turndown);
}
static void IN_PanTiltDown_f (void)
{
    if (IN_GetMouseSpace() != MS_WORLD)
        return;
    IN_KeyDown(&in_pantilt);
}
static void IN_PanTiltUp_f (void)
{
    IN_KeyUp(&in_pantilt);
}
static void IN_ShiftLeftDown_f (void)
{
    IN_KeyDown(&in_shiftleft);
}
static void IN_ShiftLeftUp_f (void)
{
    IN_KeyUp(&in_shiftleft);
}
static void IN_ShiftLeftUpDown_f (void)
{
    IN_KeyDown(&in_shiftleft);
    IN_KeyDown(&in_shiftup);
}
static void IN_ShiftLeftUpUp_f (void)
{
    IN_KeyUp(&in_shiftleft);
    IN_KeyUp(&in_shiftup);
}
static void IN_ShiftLeftDownDown_f (void)
{
    IN_KeyDown(&in_shiftleft);
    IN_KeyDown(&in_shiftdown);
}
static void IN_ShiftLeftDownUp_f (void)
{
    IN_KeyUp(&in_shiftleft);
    IN_KeyUp(&in_shiftdown);
}
static void IN_ShiftRightDown_f (void)
{
    IN_KeyDown(&in_shiftright);
}
static void IN_ShiftRightUp_f (void)
{
    IN_KeyUp(&in_shiftright);
}
static void IN_ShiftRightUpDown_f (void)
{
    IN_KeyDown(&in_shiftright);
    IN_KeyDown(&in_shiftup);
}
static void IN_ShiftRightUpUp_f (void)
{
    IN_KeyUp(&in_shiftright);
    IN_KeyUp(&in_shiftup);
}
static void IN_ShiftRightDownDown_f (void)
{
    IN_KeyDown(&in_shiftright);
    IN_KeyDown(&in_shiftdown);
}
static void IN_ShiftRightDownUp_f (void)
{
    IN_KeyUp(&in_shiftright);
    IN_KeyUp(&in_shiftdown);
}
static void IN_ShiftUpDown_f (void)
{
    IN_KeyDown(&in_shiftup);
}
static void IN_ShiftUpUp_f (void)
{
    IN_KeyUp(&in_shiftup);
}
static void IN_ShiftDownDown_f (void)
{
    IN_KeyDown(&in_shiftdown);
}
static void IN_ShiftDownUp_f (void)
{
    IN_KeyUp(&in_shiftdown);
}
static void IN_ZoomInDown_f (void)
{
    IN_KeyDown(&in_zoomin);
}
static void IN_ZoomInUp_f (void)
{
    IN_KeyUp(&in_zoomin);
}
static void IN_ZoomOutDown_f (void)
{
    IN_KeyDown(&in_zoomout);
}
static void IN_ZoomOutUp_f (void)
{
    IN_KeyUp(&in_zoomout);
}


static void CL_LevelUp_f (void)
{
    if (!CL_OnBattlescape())
        return;
    Cvar_SetValue("cl_worldlevel", (cl_worldlevel->integer < cl.mapMaxLevel - 1) ? cl_worldlevel->integer + 1 : cl.mapMaxLevel - 1);
}

static void CL_LevelDown_f (void)
{
    if (!CL_OnBattlescape())
        return;
    Cvar_SetValue("cl_worldlevel", (cl_worldlevel->integer > 0) ? cl_worldlevel->integer - 1 : 0);
}

static void CL_ZoomInQuant_f (void)
{
    CL_CameraZoomIn();
}

static void CL_ZoomOutQuant_f (void)
{
    CL_CameraZoomOut();
}

static void CL_WheelDown_f (void)
{
    UI_MouseScroll(0, 1);
}

static void CL_WheelUp_f (void)
{
    UI_MouseScroll(0, -1);
}

static void CL_SelectDown_f (void)
{
    battlescapeMouseDraggingPossible = (CL_BattlescapeRunning() && IN_GetMouseSpace() != MS_UI);
    if (!battlescapeMouseDraggingPossible)
        return;
    battlescapeMouseDraggingX = mousePosX;
    battlescapeMouseDraggingY = mousePosY;
    battlescapeMouseDraggingActive = false;
    CL_InitBattlescapeMouseDragging();
}

static void CL_SelectUp_f (void)
{
#ifdef ANDROID
    /* Android input quirk - when user tries to zoom/rotate, and touches the screen with a second finger,
     * SDL will send left mouse button up event, and right mouse button down event immediately after that,
     * so we need to cancel the mouse click action, and let the user zoom/rotate as she wants */
    if ((SDL_GetMouseState(nullptr, nullptr) & SDL_BUTTON(SDL_BUTTON_RIGHT)) == 0)
#endif
    if (IN_GetMouseSpace() == MS_WORLD && !battlescapeMouseDraggingActive)
        CL_ActorSelectMouse();
    battlescapeMouseDraggingPossible = false;
    battlescapeMouseDraggingActive = false;
    if (IN_GetMouseSpace() == MS_UI)
        return;
    IN_SetMouseSpace(MS_NULL);
}

static void CL_ProcessMouseDragging (void)
{
    if (!battlescapeMouseDraggingPossible)
        return;

    if (!battlescapeMouseDraggingActive &&
        (abs(battlescapeMouseDraggingX - mousePosX) > BATTLESCAPE_MOUSE_DRAGGING_TRIGGER_X ||
         abs(battlescapeMouseDraggingY - mousePosY) > BATTLESCAPE_MOUSE_DRAGGING_TRIGGER_Y))
        battlescapeMouseDraggingActive = true;

    if (battlescapeMouseDraggingActive)
        CL_BattlescapeMouseDragging();
}

static void CL_ActionDown_f (void)
{
    if (!CL_OnBattlescape())
        return;
    IN_KeyDown(&in_pantilt);
}

static void CL_ActionUp_f (void)
{
    IN_KeyUp(&in_pantilt);
    if (IN_GetMouseSpace() == MS_UI)
        return;
    if (in_pantilt.msec < 250)
        CL_ActorActionMouse();
    IN_SetMouseSpace(MS_NULL);
}

static void CL_TurnDown_f (void)
{
    if (IN_GetMouseSpace() == MS_UI)
        return;
    if (IN_GetMouseSpace() == MS_WORLD)
        CL_ActorTurnMouse();
}

static void CL_TurnUp_f (void)
{
    if (IN_GetMouseSpace() == MS_UI)
        return;
    IN_SetMouseSpace(MS_NULL);
}

static void CL_HudRadarDown_f (void)
{
    if (!CL_BattlescapeRunning())
        return;
    UI_PushWindow("radarmenu");
}

static void CL_HudRadarUp_f (void)
{
    if (!CL_BattlescapeRunning())
        return;
    UI_CloseWindow("radarmenu");
}

static void CL_RightClickDown_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseDown(mousePosX, mousePosY, K_MOUSE2);
    }
}

static void CL_RightClickUp_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseUp(mousePosX, mousePosY, K_MOUSE2);
    }
}

static void CL_MiddleClickDown_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseDown(mousePosX, mousePosY, K_MOUSE3);
    }
}

static void CL_MiddleClickUp_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseUp(mousePosX, mousePosY, K_MOUSE3);
    }
}

static void CL_LeftClickDown_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseDown(mousePosX, mousePosY, K_MOUSE1);
    }
}

static void CL_LeftClickUp_f (void)
{
    if (IN_GetMouseSpace() == MS_UI) {
        UI_MouseUp(mousePosX, mousePosY, K_MOUSE1);
    }
}

#define SCROLL_BORDER   4
#define MOUSE_YAW_SCALE     0.1
#define MOUSE_PITCH_SCALE   0.1

float CL_GetKeyMouseState (int dir)
{
    float value;

    switch (dir) {
    case STATE_FORWARD:
        /* sum directions, 'true' is use as '1' */
        value = (in_shiftup.state & 1) + (mousePosY <= (viddef.y / viddef.ry) + SCROLL_BORDER) - (in_shiftdown.state & 1) - (mousePosY >= ((viddef.y + viddef.viewHeight) / viddef.ry) - SCROLL_BORDER);
        break;
    case STATE_RIGHT:
        /* sum directions, 'true' is use as '1' */
        value = (in_shiftright.state & 1) + (mousePosX >= ((viddef.x + viddef.viewWidth) / viddef.rx) - SCROLL_BORDER) - (in_shiftleft.state & 1) - (mousePosX <= (viddef.x / viddef.rx) + SCROLL_BORDER);
        break;
    case STATE_ZOOM:
        value = (in_zoomin.state & 1) - (in_zoomout.state & 1);
        break;
    case STATE_ROT:
        value = (in_turnleft.state & 1) - (in_turnright.state & 1);
        if (in_pantilt.state)
            value -= (float) (mousePosX - oldMousePosX) * MOUSE_YAW_SCALE;
        break;
    case STATE_TILT:
        value = (in_turnup.state & 1) - (in_turndown.state & 1);
        if (in_pantilt.state)
            value += (float) (mousePosY - oldMousePosY) * MOUSE_PITCH_SCALE;
        break;
    default:
        value = 0.0;
        break;
    }

    return value;
}

static void IN_Parse (void)
{
    IN_SetMouseSpace(MS_NULL);

    /* standard menu and world mouse handling */
    if (UI_IsMouseOnWindow()) {
        IN_SetMouseSpace(MS_UI);
        return;
    }

    if (cls.state != ca_active)
        return;

    if (!viddef.viewWidth || !viddef.viewHeight)
        return;

    if (CL_ActorMouseTrace()) {
        /* mouse is in the world */
        IN_SetMouseSpace(MS_WORLD);
    }
}

static inline void IN_PrintKey (const SDL_Event* event, int down)
{
    if (in_debug->integer) {
        Com_Printf("key name: %s (down: %i)", SDL_GetKeyName(event->key.keysym.sym), down);
#if SDL_VERSION_ATLEAST(2,0,0)
        const int unicode = event->key.keysym.sym;
#else
        const int unicode = event->key.keysym.unicode;
#endif
        if (unicode) {
            Com_Printf(" unicode: %x", unicode);
            if (unicode >= '0' && unicode <= '~')  /* printable? */
                Com_Printf(" (%c)", (unsigned char)(unicode));
        }
        Com_Printf("\n");
    }
}

static bool IN_TranslateKey (const unsigned int keycode, unsigned int* ascii)
{
    bool translated = true;
    switch (keycode) {
    case SDLK_PAGEUP:
        *ascii = K_PGUP;
        break;
#if SDL_VERSION_ATLEAST(2,0,0)
    case SDLK_KP_0:
        *ascii = K_KP_INS;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_1:
        *ascii = K_KP_END;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_2:
        *ascii = K_KP_DOWNARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_3:
        *ascii = K_KP_PGDN;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_4:
        *ascii = K_KP_LEFTARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_5:
        *ascii = K_KP_5;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_6:
        *ascii = K_KP_RIGHTARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_7:
        *ascii = K_KP_HOME;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_8:
        *ascii = K_KP_UPARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_9:
        *ascii = K_KP_PGUP;
        translated = !Key_IsNumlock();
        break;
    case SDLK_PRINTSCREEN:
        *ascii = K_PRINT;
        break;
    case SDLK_SCROLLLOCK:
        *ascii = K_SCROLLOCK;
        break;
#else
    case SDLK_KP0:
        *ascii = K_KP_INS;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP1:
        *ascii = K_KP_END;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP2:
        *ascii = K_KP_DOWNARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP3:
        *ascii = K_KP_PGDN;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP4:
        *ascii = K_KP_LEFTARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP5:
        *ascii = K_KP_5;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP6:
        *ascii = K_KP_RIGHTARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP7:
        *ascii = K_KP_HOME;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP8:
        *ascii = K_KP_UPARROW;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP9:
        *ascii = K_KP_PGUP;
        translated = !Key_IsNumlock();
        break;
    case SDLK_LSUPER:
    case SDLK_RSUPER:
        *ascii = K_SUPER;
        break;
    case SDLK_COMPOSE:
        *ascii = K_COMPOSE;
        break;
    case SDLK_PRINT:
        *ascii = K_PRINT;
        break;
    case SDLK_BREAK:
        *ascii = K_BREAK;
        break;
    case SDLK_EURO:
        *ascii = K_EURO;
        break;
    case SDLK_SCROLLOCK:
        *ascii = K_SCROLLOCK;
        break;
    case SDLK_NUMLOCK:
        *ascii = K_KP_NUMLOCK;
        break;
#endif
    case SDLK_PAGEDOWN:
        *ascii = K_PGDN;
        break;
    case SDLK_HOME:
        *ascii = K_HOME;
        break;
    case SDLK_END:
        *ascii = K_END;
        break;
    case SDLK_LEFT:
        *ascii = K_LEFTARROW;
        break;
    case SDLK_RIGHT:
        *ascii = K_RIGHTARROW;
        break;
    case SDLK_DOWN:
        *ascii = K_DOWNARROW;
        break;
    case SDLK_UP:
        *ascii = K_UPARROW;
        break;
    case SDLK_ESCAPE:
        *ascii = K_ESCAPE;
        break;
    case SDLK_KP_ENTER:
        *ascii = K_KP_ENTER;
        break;
    case SDLK_RETURN:
        *ascii = K_ENTER;
        break;
    case SDLK_TAB:
        *ascii = K_TAB;
        break;
    case SDLK_F1:
        *ascii = K_F1;
        break;
    case SDLK_F2:
        *ascii = K_F2;
        break;
    case SDLK_F3:
        *ascii = K_F3;
        break;
    case SDLK_F4:
        *ascii = K_F4;
        break;
    case SDLK_F5:
        *ascii = K_F5;
        break;
    case SDLK_F6:
        *ascii = K_F6;
        break;
    case SDLK_F7:
        *ascii = K_F7;
        break;
    case SDLK_F8:
        *ascii = K_F8;
        break;
    case SDLK_F9:
        *ascii = K_F9;
        break;
    case SDLK_F10:
        *ascii = K_F10;
        break;
    case SDLK_F11:
        *ascii = K_F11;
        break;
    case SDLK_F12:
        *ascii = K_F12;
        break;
    case SDLK_F13:
        *ascii = K_F13;
        break;
    case SDLK_F14:
        *ascii = K_F14;
        break;
    case SDLK_F15:
        *ascii = K_F15;
        break;
    case SDLK_BACKSPACE:
        *ascii = K_BACKSPACE;
        break;
    case SDLK_KP_PERIOD:
        *ascii = K_KP_DEL;
        translated = !Key_IsNumlock();
        break;
    case SDLK_DELETE:
        *ascii = K_DEL;
        break;
    case SDLK_PAUSE:
        *ascii = K_PAUSE;
        break;
    case SDLK_LSHIFT:
    case SDLK_RSHIFT:
        *ascii = K_SHIFT;
        break;
    case SDLK_LCTRL:
    case SDLK_RCTRL:
        *ascii = K_CTRL;
        break;
    case SDLK_LALT:
    case SDLK_RALT:
        *ascii = K_ALT;
        break;
    case SDLK_INSERT:
        *ascii = K_INS;
        break;
    case SDLK_KP_PLUS:
        *ascii = K_KP_PLUS;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_MINUS:
        *ascii = K_KP_MINUS;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_DIVIDE:
        *ascii = K_KP_SLASH;
        translated = !Key_IsNumlock();
        break;
    case SDLK_KP_MULTIPLY:
        *ascii = K_KP_MULTIPLY;
        translated = !Key_IsNumlock();
        break;
    case SDLK_MODE:
        *ascii = K_MODE;
        break;
    case SDLK_HELP:
        *ascii = K_HELP;
        break;
    case SDLK_SYSREQ:
        *ascii = K_SYSREQ;
        break;
    case SDLK_MENU:
        *ascii = K_MENU;
        break;
    case SDLK_POWER:
        *ascii = K_POWER;
        break;
    case SDLK_UNDO:
        *ascii = K_UNDO;
        break;
    case SDLK_CAPSLOCK:
        *ascii = K_CAPSLOCK;
        break;
    case SDLK_SPACE:
        *ascii = K_SPACE;
        break;
    default:
        translated = false;
        if (UTF8_encoded_len(keycode) == 1 && isprint(keycode))
            *ascii = keycode;
        else
            *ascii = 0;
        break;
    }
    return translated;
}

void IN_EventEnqueue (unsigned int keyNum, unsigned short keyUnicode, bool keyDown)
{
    if (keyNum > 0 || keyUnicode > 0) {
        if (in_debug->integer)
            Com_Printf("Enqueue: %s (%i) (down: %i)\n", Key_KeynumToString(keyNum), keyNum, keyDown);
        keyq[keyq_head].down = keyDown;
        keyq[keyq_head].unicode = keyUnicode;
        keyq[keyq_head].key = keyNum;
        keyq_head = (keyq_head + 1) & (MAX_KEYQ - 1);
    }
}

static bool IN_ToggleFullscreen (const bool full)
{
#if SDL_VERSION_ATLEAST(2,0,0)
    const int mask = full ? SDL_WINDOW_FULLSCREEN : SDL_WINDOW_FULLSCREEN_DESKTOP;
    const bool isFullScreen = SDL_GetWindowFlags(cls.window) & mask;
    SDL_SetWindowFullscreen(cls.window, isFullScreen ? 0 : mask);
    return SDL_GetWindowFlags(cls.window) & mask;
#else
#ifdef _WIN32
    return false;
#else
    SDL_Surface* surface = SDL_GetVideoSurface();
    if (!SDL_WM_ToggleFullScreen(surface)) {
        const int flags = surface->flags ^= SDL_FULLSCREEN;
        SDL_SetVideoMode(surface->w, surface->h, 0, flags);
    }

    return surface->flags & SDL_FULLSCREEN;
#endif
#endif
}

void IN_Frame (void)
{
    int mouse_buttonstate;
    unsigned short unicode;
    unsigned int key;
    SDL_Event event;

    IN_Parse();

    IN_JoystickMove();

    CL_ProcessMouseDragging();

    if (vid_grabmouse->modified) {
        vid_grabmouse->modified = false;

        if (!vid_grabmouse->integer) {
            /* ungrab the pointer */
            Com_Printf("Switch grab input off\n");
#if SDL_VERSION_ATLEAST(2,0,0)
            SDL_SetWindowGrab(cls.window, SDL_FALSE);
#else
            SDL_WM_GrabInput(SDL_GRAB_OFF);
#endif
        } else  {
            /* grab the pointer */
            Com_Printf("Switch grab input on\n");
#if SDL_VERSION_ATLEAST(2,0,0)
            SDL_SetWindowGrab(cls.window, SDL_TRUE);
#else
            SDL_WM_GrabInput(SDL_GRAB_ON);
#endif
        }
    }

    oldMousePosX = mousePosX;
    oldMousePosY = mousePosY;

    while (SDL_PollEvent(&event)) {
        switch (event.type) {
#if SDL_VERSION_ATLEAST(2,0,0)
        case SDL_MOUSEWHEEL:
            mouse_buttonstate = event.wheel.y < 0 ? K_MWHEELDOWN : K_MWHEELUP;
            IN_EventEnqueue(mouse_buttonstate, 0, true);
            break;
        case SDL_TEXTEDITING:
            break;
        case SDL_TEXTINPUT: {
            if (!SDL_IsTextInputActive())
                break;

            const char* text = event.text.text;
            const char** str = &text;
            for (;;) {
                const int characterUnicode = UTF8_next(str);
                if (characterUnicode == -1) {
                    break;
                }
                unicode = characterUnicode;
                IN_TranslateKey(characterUnicode, &key);
                IN_EventEnqueue(key, unicode, true);
                IN_EventEnqueue(key, unicode, false);
            }
            break;
        }
#endif
        case SDL_MOUSEBUTTONDOWN:
        case SDL_MOUSEBUTTONUP:
            switch (event.button.button) {
            case SDL_BUTTON_LEFT:
                mouse_buttonstate = K_MOUSE1;
                break;
            case SDL_BUTTON_MIDDLE:
                mouse_buttonstate = K_MOUSE3;
                break;
            case SDL_BUTTON_RIGHT:
                mouse_buttonstate = K_MOUSE2;
                break;
#if SDL_VERSION_ATLEAST(2,0,0)
            case SDL_BUTTON_X1:
                mouse_buttonstate = K_MOUSE4;
                break;
            case SDL_BUTTON_X2:
                mouse_buttonstate = K_MOUSE5;
                break;
#else
            case SDL_BUTTON_WHEELUP:
                mouse_buttonstate = K_MWHEELUP;
                break;
            case SDL_BUTTON_WHEELDOWN:
                mouse_buttonstate = K_MWHEELDOWN;
                break;
            case 6:
                mouse_buttonstate = K_MOUSE4;
                break;
            case 7:
                mouse_buttonstate = K_MOUSE5;
                break;
#endif
            default:
                mouse_buttonstate = K_AUX1 + (event.button.button - 8) % 16;
                break;
            }
            IN_EventEnqueue(mouse_buttonstate, 0, (event.type == SDL_MOUSEBUTTONDOWN));
            break;

        case SDL_MOUSEMOTION:
            SDL_GetMouseState(&mousePosX, &mousePosY);
            mousePosX /= viddef.rx;
            mousePosY /= viddef.ry;
            break;

        case SDL_KEYDOWN:
            IN_PrintKey(&event, 1);
            if ((event.key.keysym.mod & KMOD_ALT) && event.key.keysym.sym == SDLK_RETURN) {
                Com_Printf("try to toggle fullscreen\n");
                if (IN_ToggleFullscreen(false)) {
                    Cvar_SetValue("vid_fullscreen", 1);
                    /* make sure, that input grab is deactivated in fullscreen mode */
                    Cvar_SetValue("vid_grabmouse", 0);
                } else {
                    Cvar_SetValue("vid_fullscreen", 0);
                }
                vid_fullscreen->modified = false; /* we just changed it with SDL. */
                break; /* ignore this key */
            }

            if ((event.key.keysym.mod & KMOD_CTRL) && event.key.keysym.sym == SDLK_RETURN) {
                Com_Printf("try to toggle fullscreen\n");
                if (IN_ToggleFullscreen(true)) {
                    Cvar_SetValue("vid_fullscreen", 2);
                } else {
                    Cvar_SetValue("vid_fullscreen", 0);
                }
                vid_fullscreen->modified = false; /* we just changed it with SDL. */
                break; /* ignore this key */
            }

            if ((event.key.keysym.mod & KMOD_CTRL) && event.key.keysym.sym == SDLK_g) {
#if SDL_VERSION_ATLEAST(2,0,0)
                const bool grab = SDL_GetWindowGrab(cls.window);
                Cvar_SetValue("vid_grabmouse", grab ? 0 : 1);
#else
                SDL_GrabMode gm = SDL_WM_GrabInput(SDL_GRAB_QUERY);
                Cvar_SetValue("vid_grabmouse", (gm == SDL_GRAB_ON) ? 0 : 1);
#endif
                Com_Printf("toggled mouse grab (%s)\n", vid_grabmouse->integer == 1 ? "true" : "false");
                break; /* ignore this key */
            }

            /* console key is hardcoded, so the user can never unbind it */
            if ((event.key.keysym.mod & KMOD_SHIFT) && event.key.keysym.sym == SDLK_ESCAPE) {
                Con_ToggleConsole_f();
                break;
            }

#if SDL_VERSION_ATLEAST(2,0,0)
            /* SDL_TEXTINPUT above will handle normal text for sdl2 */
            if (IN_TranslateKey(event.key.keysym.sym, &key) || !SDL_IsTextInputActive())
                IN_EventEnqueue(key, 0, true);
#else
            unicode = event.key.keysym.unicode;
            IN_TranslateKey(event.key.keysym.sym, &key);
            IN_EventEnqueue(key, unicode, true);
#endif
            break;

        case SDL_KEYUP:
            IN_PrintKey(&event, 0);
#if SDL_VERSION_ATLEAST(2,0,0)
            /* SDL_TEXTINPUT above will handle normal text for sdl2 */
            if (IN_TranslateKey(event.key.keysym.sym, &key) || !SDL_IsTextInputActive())
                    IN_EventEnqueue(key, 0, false);
#else
            unicode = event.key.keysym.unicode;
            IN_TranslateKey(event.key.keysym.sym, &key);
            IN_EventEnqueue(key, unicode, false);
#endif
            break;

#if SDL_VERSION_ATLEAST(2,0,0)

        case SDL_WINDOWEVENT:
            switch (event.window.type) {
            case SDL_WINDOWEVENT_FOCUS_LOST:
                UI_ReleaseInput();
                break;
            case SDL_WINDOWEVENT_RESIZED:
                /* make sure that SDL_SetVideoMode is called again after we changed the size
                 * otherwise the mouse will make problems */
                vid_mode->modified = true;
                break;
            default:
                break;
            }
            break;
#else
        case SDL_VIDEOEXPOSE:
            break;

        case SDL_ACTIVEEVENT:
            /* make sure the menu no more captures the input when the game window loses focus */
            if (event.active.state == SDL_APPINPUTFOCUS && event.active.gain == 0)
                UI_ReleaseInput();
            break;

        case SDL_VIDEORESIZE:
            /* make sure that SDL_SetVideoMode is called again after we changed the size
             * otherwise the mouse will make problems */
            vid_mode->modified = true;
#ifdef ANDROID
            /* On Android the OpenGL context is destroyed after we've received a resize event,
             * so wee need to re-init OpenGL state machine and re-upload all textures */
            R_ReinitOpenglContext();
#endif
            break;
#endif

        case SDL_QUIT:
            Cmd_ExecuteString("quit");
            break;
        }
    }
}

static void CL_PressKey_f (void)
{
    if (Cmd_Argc() != 2) {
        Com_Printf("Usage: %s <key> : simulate press of a key\n", Cmd_Argv(0));
        return;
    }

    const unsigned int keyNum = Key_StringToKeynum(Cmd_Argv(1));
    /* @todo unicode value is wrong */
    IN_EventEnqueue(keyNum, '?', true);
    IN_EventEnqueue(keyNum, '?', false);
}

typedef struct cursorChange_s {
    mouseSpace_t prevSpace;
    int cursor;
} cursorChange_t;

static cursorChange_t cursorChange;

void IN_SetMouseSpace (mouseSpace_t mspace)
{
    if (mspace != MS_NULL) {
        if (mspace != cursorChange.prevSpace) {
            SCR_ChangeCursor(cursorChange.cursor);
        }
    }
    if (mouseSpace != MS_NULL && mouseSpace != cursorChange.prevSpace) {
        cursorChange.prevSpace = mouseSpace;
        cursorChange.cursor = Cvar_GetValue("cursor");
    }
    mouseSpace = mspace;
}

void IN_Init (void)
{
    Com_Printf("\n------- input initialization -------\n");

    /* cvars */
    in_debug = Cvar_Get("in_debug", "0", 0, "Show input key codes on game console");
    cl_isometric = Cvar_Get("r_isometric", "0", CVAR_ARCHIVE, "Draw the world in isometric mode");

    /* commands */
    Cmd_AddCommand("+turnleft", IN_TurnLeftDown_f, N_("Rotate battlescape camera anti-clockwise"));
    Cmd_AddCommand("-turnleft", IN_TurnLeftUp_f);
    Cmd_AddCommand("+turnright", IN_TurnRightDown_f, N_("Rotate battlescape camera clockwise"));
    Cmd_AddCommand("-turnright", IN_TurnRightUp_f);
    Cmd_AddCommand("+turnup", IN_TurnUpDown_f, N_("Tilt battlescape camera up"));
    Cmd_AddCommand("-turnup", IN_TurnUpUp_f);
    Cmd_AddCommand("+turndown", IN_TurnDownDown_f, N_("Tilt battlescape camera down"));
    Cmd_AddCommand("-turndown", IN_TurnDownUp_f);
    Cmd_AddCommand("+pantilt", IN_PanTiltDown_f, N_("Move battlescape camera"));
    Cmd_AddCommand("-pantilt", IN_PanTiltUp_f);
    Cmd_AddCommand("+shiftleft", IN_ShiftLeftDown_f, N_("Move battlescape camera left"));
    Cmd_AddCommand("-shiftleft", IN_ShiftLeftUp_f);
    Cmd_AddCommand("+shiftleftup", IN_ShiftLeftUpDown_f, N_("Move battlescape camera top left"));
    Cmd_AddCommand("-shiftleftup", IN_ShiftLeftUpUp_f);
    Cmd_AddCommand("+shiftleftdown", IN_ShiftLeftDownDown_f, N_("Move battlescape camera bottom left"));
    Cmd_AddCommand("-shiftleftdown", IN_ShiftLeftDownUp_f);
    Cmd_AddCommand("+shiftright", IN_ShiftRightDown_f, N_("Move battlescape camera right"));
    Cmd_AddCommand("-shiftright", IN_ShiftRightUp_f);
    Cmd_AddCommand("+shiftrightup", IN_ShiftRightUpDown_f, N_("Move battlescape camera top right"));
    Cmd_AddCommand("-shiftrightup", IN_ShiftRightUpUp_f);
    Cmd_AddCommand("+shiftrightdown", IN_ShiftRightDownDown_f, N_("Move battlescape camera bottom right"));
    Cmd_AddCommand("-shiftrightdown", IN_ShiftRightDownUp_f);
    Cmd_AddCommand("+shiftup", IN_ShiftUpDown_f, N_("Move battlescape camera forward"));
    Cmd_AddCommand("-shiftup", IN_ShiftUpUp_f);
    Cmd_AddCommand("+shiftdown", IN_ShiftDownDown_f, N_("Move battlescape camera backward"));
    Cmd_AddCommand("-shiftdown", IN_ShiftDownUp_f);
    Cmd_AddCommand("+zoomin", IN_ZoomInDown_f, N_("Zoom in"));
    Cmd_AddCommand("-zoomin", IN_ZoomInUp_f);
    Cmd_AddCommand("+zoomout", IN_ZoomOutDown_f, N_("Zoom out"));
    Cmd_AddCommand("-zoomout", IN_ZoomOutUp_f);

    Cmd_AddCommand("+leftmouse", CL_LeftClickDown_f, N_("Left mouse button click (menu)"));
    Cmd_AddCommand("-leftmouse", CL_LeftClickUp_f);
    Cmd_AddCommand("+middlemouse", CL_MiddleClickDown_f, N_("Middle mouse button click (menu)"));
    Cmd_AddCommand("-middlemouse", CL_MiddleClickUp_f);
    Cmd_AddCommand("+rightmouse", CL_RightClickDown_f, N_("Right mouse button click (menu)"));
    Cmd_AddCommand("-rightmouse", CL_RightClickUp_f);
    Cmd_AddCommand("wheelupmouse", CL_WheelUp_f, N_("Mouse wheel up"));
    Cmd_AddCommand("wheeldownmouse", CL_WheelDown_f, N_("Mouse wheel down"));
    Cmd_AddCommand("+select", CL_SelectDown_f, N_("Select objects/Walk to a square/In fire mode, fire etc"));
    Cmd_AddCommand("-select", CL_SelectUp_f);
    Cmd_AddCommand("+action", CL_ActionDown_f, N_("Rotate Battlescape/In fire mode, cancel action"));
    Cmd_AddCommand("-action", CL_ActionUp_f);
    Cmd_AddCommand("+turn", CL_TurnDown_f, N_("Turn soldier toward mouse pointer"));
    Cmd_AddCommand("-turn", CL_TurnUp_f);
    Cmd_AddCommand("+hudradar", CL_HudRadarDown_f, N_("Toggles the hud radar mode"));
    Cmd_AddCommand("-hudradar", CL_HudRadarUp_f);

    Cmd_AddCommand("levelup", CL_LevelUp_f, N_("Slice through terrain at a higher level"));
    Cmd_AddCommand("leveldown", CL_LevelDown_f, N_("Slice through terrain at a lower level"));
    Cmd_AddCommand("zoominquant", CL_ZoomInQuant_f, N_("Zoom in"));
    Cmd_AddCommand("zoomoutquant", CL_ZoomOutQuant_f, N_("Zoom out"));

    Cmd_AddCommand("press", CL_PressKey_f, "Press a key from a command");

    mousePosX = mousePosY = 0.0;

    IN_StartupJoystick();
}

void IN_SendKeyEvents (void)
{
    while (keyq_head != keyq_tail) {
        Key_Event(keyq[keyq_tail].key, keyq[keyq_tail].unicode, keyq[keyq_tail].down, CL_Milliseconds());
        keyq_tail = (keyq_tail + 1) & (MAX_KEYQ - 1);
    }
}