rcore_drm.c

/**********************************************************************************************
*
*   rcore_drm - Functions to manage window, graphics device and inputs
*
*   PLATFORM: DRM
*       - Raspberry Pi 0-5 (DRM/KMS)
*       - Linux DRM subsystem (KMS mode)
*
*   LIMITATIONS:
*       - Most of the window/monitor functions are not implemented (not required)
*
*   POSSIBLE IMPROVEMENTS:
*       - Improvement 01
*       - Improvement 02
*
*   ADDITIONAL NOTES:
*       - TRACELOG() function is located in raylib [utils] module
*
*   CONFIGURATION:
*       #define SUPPORT_SSH_KEYBOARD_RPI (Raspberry Pi only)
*           Reconfigure standard input to receive key inputs, works with SSH connection.
*           WARNING: Reconfiguring standard input could lead to undesired effects, like breaking other
*           running processes orblocking the device if not restored properly. Use with care.
*
*   DEPENDENCIES:
*       - DRM and GLM: System libraries for display initialization and configuration
*       - gestures: Gestures system for touch-ready devices (or simulated from mouse inputs)
*
*
*   LICENSE: zlib/libpng
*
*   Copyright (c) 2013-2024 Ramon Santamaria (@raysan5) and contributors
*
*   This software is provided "as-is", without any express or implied warranty. In no event
*   will the authors be held liable for any damages arising from the use of this software.
*
*   Permission is granted to anyone to use this software for any purpose, including commercial
*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
*     1. The origin of this software must not be misrepresented; you must not claim that you
*     wrote the original software. If you use this software in a product, an acknowledgment
*     in the product documentation would be appreciated but is not required.
*
*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
*     as being the original software.
*
*     3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/

#include <fcntl.h>   // POSIX file control definitions - open(), creat(), fcntl()
#include <unistd.h>  // POSIX standard function definitions - read(), close(), STDIN_FILENO
#include <termios.h> // POSIX terminal control definitions - tcgetattr(), tcsetattr()
#include <pthread.h> // POSIX threads management (inputs reading)
#include <dirent.h>  // POSIX directory browsing

#include <sys/ioctl.h>      // Required for: ioctl() - UNIX System call for device-specific input/output operations
#include <linux/kd.h>       // Linux: KDSKBMODE, K_MEDIUMRAM constants definition
#include <linux/input.h>    // Linux: Keycodes constants definition (KEY_A, ...)
#include <linux/joystick.h> // Linux: Joystick support library

#include <gbm.h>         // Generic Buffer Management (native platform for EGL on DRM)
#include <xf86drm.h>     // Direct Rendering Manager user-level library interface
#include <xf86drmMode.h> // Direct Rendering Manager mode setting (KMS) interface

#include "EGL/egl.h"    // Native platform windowing system interface
#include "EGL/eglext.h" // EGL extensions

//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#define USE_LAST_TOUCH_DEVICE       // When multiple touchscreens are connected, only use the one with the highest event<N> number

#define DEFAULT_GAMEPAD_DEV    "/dev/input/js"      // Gamepad input (base dev for all gamepads: js0, js1, ...)
#define DEFAULT_EVDEV_PATH       "/dev/input/"      // Path to the linux input events

//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------

typedef struct {
    pthread_t threadId;                 // Event reading thread id

    int fd;                             // File descriptor to the device it is assigned to
    int eventNum;                       // Number of 'event<N>' device
    Rectangle absRange;                 // Range of values for absolute pointing devices (touchscreens)
    int touchSlot;                      // Hold the touch slot number of the currently being sent multitouch block
    bool isMouse;                       // True if device supports relative X Y movements
    bool isTouch;                       // True if device supports absolute X Y movements and has BTN_TOUCH
    bool isMultitouch;                  // True if device supports multiple absolute movevents and has BTN_TOUCH
    bool isKeyboard;                    // True if device has letter keycodes
    bool isGamepad;                     // True if device has gamepad buttons
} InputEventWorker;

typedef struct {
    // Display data
    int fd;                             // File descriptor for /dev/dri/...
    drmModeConnector *connector;        // Direct Rendering Manager (DRM) mode connector
    drmModeCrtc *crtc;                  // CRT Controller
    int modeIndex;                      // Index of the used mode of connector->modes
    struct gbm_device *gbmDevice;       // GBM device
    struct gbm_surface *gbmSurface;     // GBM surface
    struct gbm_bo *prevBO;              // Previous GBM buffer object (during frame swapping)
    uint32_t prevFB;                    // Previous GBM framebufer (during frame swapping)

    EGLDisplay device;                  // Native display device (physical screen connection)
    EGLSurface surface;                 // Surface to draw on, framebuffers (connected to context)
    EGLContext context;                 // Graphic context, mode in which drawing can be done
    EGLConfig config;                   // Graphic config

    // Input data
    InputEventWorker eventWorker[10];   // List of worker threads for every monitored "/dev/input/event<N>"

    // Keyboard data
    int defaultKeyboardMode;            // Default keyboard mode
    bool eventKeyboardMode;             // Keyboard in event mode
    int defaultFileFlags;               // Default IO file flags
    struct termios defaultSettings;     // Default keyboard settings
    int keyboardFd;                     // File descriptor for the evdev keyboard

    // Mouse data
    Vector2 eventWheelMove;             // Registers the event mouse wheel variation
    // NOTE: currentButtonState[] can't be written directly due to multithreading, app could miss the update
    char currentButtonStateEvdev[MAX_MOUSE_BUTTONS]; // Holds the new mouse state for the next polling event to grab
    bool cursorRelative;                // Relative cursor mode
    int mouseFd;                        // File descriptor for the evdev mouse/touch/gestures
    Rectangle absRange;                 // Range of values for absolute pointing devices (touchscreens)
    int touchSlot;                      // Hold the touch slot number of the currently being sent multitouch block

    // Gamepad data
    int gamepadStreamFd[MAX_GAMEPADS];  // Gamepad device file descriptor

} PlatformData;

//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
extern CoreData CORE;                   // Global CORE state context

static PlatformData platform = { 0 };   // Platform specific data

//----------------------------------------------------------------------------------
// Local Variables Definition
//----------------------------------------------------------------------------------
// Scancode to keycode mapping for US keyboards
// TODO: Replace this with a keymap from the X11 to get the correct regional map for the keyboard:
// Currently non US keyboards will have the wrong mapping for some keys
static const int keymapUS[] = {
    0, 256, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 45, 61, 259, 258, 81, 87, 69, 82, 84,
    89, 85, 73, 79, 80, 91, 93, 257, 341, 65, 83, 68, 70, 71, 72, 74, 75, 76, 59, 39, 96,
    340, 92, 90, 88, 67, 86, 66, 78, 77, 44, 46, 47, 344, 332, 342, 32, 280, 290, 291,
    292, 293, 294, 295, 296, 297, 298, 299, 282, 281, 327, 328, 329, 333, 324, 325,
    326, 334, 321, 322, 323, 320, 330, 0, 85, 86, 300, 301, 89, 90, 91, 92, 93, 94, 95,
    335, 345, 331, 283, 346, 101, 268, 265, 266, 263, 262, 269, 264, 267, 260, 261,
    112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 347, 127,
    128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
    144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
    160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
    176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
    192, 193, 194, 0, 0, 0, 0, 0, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210,
    211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226,
    227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242,
    243, 244, 245, 246, 247, 248, 0, 0, 0, 0, 0, 0, 0
};

// NOTE: The complete evdev EV_KEY list can be found at /usr/include/linux/input-event-codes.h
// TODO: Complete the LUT with all unicode decimal values
static const int EvkeyToUnicodeLUT[] = {
    0, 27, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 45, 61, 8, 0, 113, 119, 101, 114,
    116, 121, 117, 105, 111, 112, 0, 0, 13, 0, 97, 115, 100, 102, 103, 104, 106, 107, 108, 59,
    39, 96, 0, 92, 122, 120, 99, 118, 98, 110, 109, 44, 46, 47, 0, 0, 0, 32
    // LUT currently incomplete, just mapped the most essential keys
};

//----------------------------------------------------------------------------------
// Module Internal Functions Declaration
//----------------------------------------------------------------------------------
int InitPlatform(void);          // Initialize platform (graphics, inputs and more)
void ClosePlatform(void);        // Close platform

static void InitKeyboard(void);                 // Initialize raw keyboard system
static void RestoreKeyboard(void);              // Restore keyboard system
#if defined(SUPPORT_SSH_KEYBOARD_RPI)
static void ProcessKeyboard(void);              // Process keyboard events
#endif

static void InitEvdevInput(void);               // Initialize evdev inputs
static void ConfigureEvdevDevice(char *device); // Identifies a input device and configures it for use if appropriate
static void PollKeyboardEvents(void);           // Process evdev keyboard events
static void *EventThread(void *arg);            // Input device events reading thread

static void InitGamepad(void);                  // Initialize raw gamepad input
static void PollGamepadEvents(void);            // Gamepad reading function

static int FindMatchingConnectorMode(const drmModeConnector *connector, const drmModeModeInfo *mode);                               // Search matching DRM mode in connector's mode list
static int FindExactConnectorMode(const drmModeConnector *connector, uint width, uint height, uint fps, bool allowInterlaced);      // Search exactly matching DRM connector mode in connector's list
static int FindNearestConnectorMode(const drmModeConnector *connector, uint width, uint height, uint fps, bool allowInterlaced);    // Search the nearest matching DRM connector mode in connector's list

//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
// NOTE: Functions declaration is provided by raylib.h

//----------------------------------------------------------------------------------
// Module Functions Definition: Window and Graphics Device
//----------------------------------------------------------------------------------

// Check if application should close
// NOTE: By default, if KEY_ESCAPE pressed
bool WindowShouldClose(void)
{
    if (CORE.Window.ready) return CORE.Window.shouldClose;
    else return true;
}

// Toggle fullscreen mode
void ToggleFullscreen(void)
{
    TRACELOG(LOG_WARNING, "ToggleFullscreen() not available on target platform");
}

// Toggle borderless windowed mode
void ToggleBorderlessWindowed(void)
{
    TRACELOG(LOG_WARNING, "ToggleBorderlessWindowed() not available on target platform");
}

// Set window state: maximized, if resizable
void MaximizeWindow(void)
{
    TRACELOG(LOG_WARNING, "MaximizeWindow() not available on target platform");
}

// Set window state: minimized
void MinimizeWindow(void)
{
    TRACELOG(LOG_WARNING, "MinimizeWindow() not available on target platform");
}

// Set window state: not minimized/maximized
void RestoreWindow(void)
{
    TRACELOG(LOG_WARNING, "RestoreWindow() not available on target platform");
}

// Set window configuration state using flags
void SetWindowState(unsigned int flags)
{
    TRACELOG(LOG_WARNING, "SetWindowState() not available on target platform");
}

// Clear window configuration state flags
void ClearWindowState(unsigned int flags)
{
    TRACELOG(LOG_WARNING, "ClearWindowState() not available on target platform");
}

// Set icon for window
void SetWindowIcon(Image image)
{
    TRACELOG(LOG_WARNING, "SetWindowIcon() not available on target platform");
}

// Set icon for window
void SetWindowIcons(Image *images, int count)
{
    TRACELOG(LOG_WARNING, "SetWindowIcons() not available on target platform");
}

// Set title for window
void SetWindowTitle(const char *title)
{
    CORE.Window.title = title;
}

// Set window position on screen (windowed mode)
void SetWindowPosition(int x, int y)
{
    TRACELOG(LOG_WARNING, "SetWindowPosition() not available on target platform");
}

// Set monitor for the current window
void SetWindowMonitor(int monitor)
{
    TRACELOG(LOG_WARNING, "SetWindowMonitor() not available on target platform");
}

// Set window minimum dimensions (FLAG_WINDOW_RESIZABLE)
void SetWindowMinSize(int width, int height)
{
    CORE.Window.screenMin.width = width;
    CORE.Window.screenMin.height = height;
}

// Set window maximum dimensions (FLAG_WINDOW_RESIZABLE)
void SetWindowMaxSize(int width, int height)
{
    CORE.Window.screenMax.width = width;
    CORE.Window.screenMax.height = height;
}

// Set window dimensions
void SetWindowSize(int width, int height)
{
    TRACELOG(LOG_WARNING, "SetWindowSize() not available on target platform");
}

// Set window opacity, value opacity is between 0.0 and 1.0
void SetWindowOpacity(float opacity)
{
    TRACELOG(LOG_WARNING, "SetWindowOpacity() not available on target platform");
}

// Set window focused
void SetWindowFocused(void)
{
    TRACELOG(LOG_WARNING, "SetWindowFocused() not available on target platform");
}

// Get native window handle
void *GetWindowHandle(void)
{
    TRACELOG(LOG_WARNING, "GetWindowHandle() not implemented on target platform");
    return NULL;
}

// Get number of monitors
int GetMonitorCount(void)
{
    TRACELOG(LOG_WARNING, "GetMonitorCount() not implemented on target platform");
    return 1;
}

// Get number of monitors
int GetCurrentMonitor(void)
{
    TRACELOG(LOG_WARNING, "GetCurrentMonitor() not implemented on target platform");
    return 0;
}

// Get selected monitor position
Vector2 GetMonitorPosition(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorPosition() not implemented on target platform");
    return (Vector2){ 0, 0 };
}

// Get selected monitor width (currently used by monitor)
int GetMonitorWidth(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorWidth() not implemented on target platform");
    return 0;
}

// Get selected monitor height (currently used by monitor)
int GetMonitorHeight(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorHeight() not implemented on target platform");
    return 0;
}

// Get selected monitor physical width in millimetres
int GetMonitorPhysicalWidth(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorPhysicalWidth() not implemented on target platform");
    return 0;
}

// Get selected monitor physical height in millimetres
int GetMonitorPhysicalHeight(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorPhysicalHeight() not implemented on target platform");
    return 0;
}

// Get selected monitor refresh rate
int GetMonitorRefreshRate(int monitor)
{
    int refresh = 0;

    if ((platform.connector) && (platform.modeIndex >= 0))
    {
        refresh = platform.connector->modes[platform.modeIndex].vrefresh;
    }

    return refresh;
}

// Get the human-readable, UTF-8 encoded name of the selected monitor
const char *GetMonitorName(int monitor)
{
    TRACELOG(LOG_WARNING, "GetMonitorName() not implemented on target platform");
    return "";
}

// Get window position XY on monitor
Vector2 GetWindowPosition(void)
{
    return (Vector2){ 0, 0 };
}

// Get window scale DPI factor for current monitor
Vector2 GetWindowScaleDPI(void)
{
    return (Vector2){ 1.0f, 1.0f };
}

// Set clipboard text content
void SetClipboardText(const char *text)
{
    TRACELOG(LOG_WARNING, "SetClipboardText() not implemented on target platform");
}

// Get clipboard text content
// NOTE: returned string is allocated and freed by GLFW
const char *GetClipboardText(void)
{
    TRACELOG(LOG_WARNING, "GetClipboardText() not implemented on target platform");
    return NULL;
}

// Show mouse cursor
void ShowCursor(void)
{
    CORE.Input.Mouse.cursorHidden = false;
}

// Hides mouse cursor
void HideCursor(void)
{
    CORE.Input.Mouse.cursorHidden = true;
}

// Enables cursor (unlock cursor)
void EnableCursor(void)
{
    // Set cursor position in the middle
    SetMousePosition(CORE.Window.screen.width/2, CORE.Window.screen.height/2);

    platform.cursorRelative = false;
    CORE.Input.Mouse.cursorHidden = false;
}

// Disables cursor (lock cursor)
void DisableCursor(void)
{
    // Set cursor position in the middle
    SetMousePosition(0, 0);

    platform.cursorRelative = true;
    CORE.Input.Mouse.cursorHidden = true;
}

// Swap back buffer with front buffer (screen drawing)
void SwapScreenBuffer(void)
{
    eglSwapBuffers(platform.device, platform.surface);

    if (!platform.gbmSurface || (-1 == platform.fd) || !platform.connector || !platform.crtc) TRACELOG(LOG_ERROR, "DISPLAY: DRM initialization failed to swap");

    struct gbm_bo *bo = gbm_surface_lock_front_buffer(platform.gbmSurface);
    if (!bo) TRACELOG(LOG_ERROR, "DISPLAY: Failed GBM to lock front buffer");

    uint32_t fb = 0;
    int result = drmModeAddFB(platform.fd, platform.connector->modes[platform.modeIndex].hdisplay, platform.connector->modes[platform.modeIndex].vdisplay, 24, 32, gbm_bo_get_stride(bo), gbm_bo_get_handle(bo).u32, &fb);
    if (result != 0) TRACELOG(LOG_ERROR, "DISPLAY: drmModeAddFB() failed with result: %d", result);

    result = drmModeSetCrtc(platform.fd, platform.crtc->crtc_id, fb, 0, 0, &platform.connector->connector_id, 1, &platform.connector->modes[platform.modeIndex]);
    if (result != 0) TRACELOG(LOG_ERROR, "DISPLAY: drmModeSetCrtc() failed with result: %d", result);

    if (platform.prevFB)
    {
        result = drmModeRmFB(platform.fd, platform.prevFB);
        if (result != 0) TRACELOG(LOG_ERROR, "DISPLAY: drmModeRmFB() failed with result: %d", result);
    }

    platform.prevFB = fb;

    if (platform.prevBO) gbm_surface_release_buffer(platform.gbmSurface, platform.prevBO);

    platform.prevBO = bo;
}

//----------------------------------------------------------------------------------
// Module Functions Definition: Misc
//----------------------------------------------------------------------------------

// Get elapsed time measure in seconds since InitTimer()
double GetTime(void)
{
    double time = 0.0;
    struct timespec ts = { 0 };
    clock_gettime(CLOCK_MONOTONIC, &ts);
    unsigned long long int nanoSeconds = (unsigned long long int)ts.tv_sec*1000000000LLU + (unsigned long long int)ts.tv_nsec;

    time = (double)(nanoSeconds - CORE.Time.base)*1e-9;  // Elapsed time since InitTimer()

    return time;
}

// Open URL with default system browser (if available)
// NOTE: This function is only safe to use if you control the URL given.
// A user could craft a malicious string performing another action.
// Only call this function yourself not with user input or make sure to check the string yourself.
// Ref: https://github.com/raysan5/raylib/issues/686
void OpenURL(const char *url)
{
    TRACELOG(LOG_WARNING, "OpenURL() not implemented on target platform");
}

//----------------------------------------------------------------------------------
// Module Functions Definition: Inputs
//----------------------------------------------------------------------------------

// Set internal gamepad mappings
int SetGamepadMappings(const char *mappings)
{
    TRACELOG(LOG_WARNING, "SetGamepadMappings() not implemented on target platform");
    return 0;
}

// Set mouse position XY
void SetMousePosition(int x, int y)
{
    CORE.Input.Mouse.currentPosition = (Vector2){ (float)x, (float)y };
    CORE.Input.Mouse.previousPosition = CORE.Input.Mouse.currentPosition;
}

// Set mouse cursor
void SetMouseCursor(int cursor)
{
    TRACELOG(LOG_WARNING, "SetMouseCursor() not implemented on target platform");
}

// Register all input events
void PollInputEvents(void)
{
#if defined(SUPPORT_GESTURES_SYSTEM)
    // NOTE: Gestures update must be called every frame to reset gestures correctly
    // because ProcessGestureEvent() is just called on an event, not every frame
    UpdateGestures();
#endif

    // Reset keys/chars pressed registered
    CORE.Input.Keyboard.keyPressedQueueCount = 0;
    CORE.Input.Keyboard.charPressedQueueCount = 0;

    // Reset last gamepad button/axis registered state
    CORE.Input.Gamepad.lastButtonPressed = 0;       // GAMEPAD_BUTTON_UNKNOWN
    //CORE.Input.Gamepad.axisCount = 0;

    // Register previous keys states
    for (int i = 0; i < MAX_KEYBOARD_KEYS; i++)
    {
        CORE.Input.Keyboard.previousKeyState[i] = CORE.Input.Keyboard.currentKeyState[i];
        CORE.Input.Keyboard.keyRepeatInFrame[i] = 0;
    }

    PollKeyboardEvents();

    // Register previous mouse position
    if (platform.cursorRelative) CORE.Input.Mouse.currentPosition = (Vector2){ 0.0f, 0.0f };
    else CORE.Input.Mouse.previousPosition = CORE.Input.Mouse.currentPosition;

    // Register previous mouse states
    CORE.Input.Mouse.previousWheelMove = CORE.Input.Mouse.currentWheelMove;
    CORE.Input.Mouse.currentWheelMove = platform.eventWheelMove;
    platform.eventWheelMove = (Vector2){ 0.0f, 0.0f };
    for (int i = 0; i < MAX_MOUSE_BUTTONS; i++)
    {
        CORE.Input.Mouse.previousButtonState[i] = CORE.Input.Mouse.currentButtonState[i];
        CORE.Input.Mouse.currentButtonState[i] = platform.currentButtonStateEvdev[i];
        CORE.Input.Touch.currentTouchState[i] = platform.currentButtonStateEvdev[i];
    }

    // Register gamepads buttons events
    PollGamepadEvents();

    // Register previous touch states
    for (int i = 0; i < MAX_TOUCH_POINTS; i++) CORE.Input.Touch.previousTouchState[i] = CORE.Input.Touch.currentTouchState[i];

    // Reset touch positions
    //for (int i = 0; i < MAX_TOUCH_POINTS; i++) CORE.Input.Touch.position[i] = (Vector2){ 0, 0 };

    // Map touch position to mouse position for convenience
    CORE.Input.Touch.position[0] = CORE.Input.Mouse.currentPosition;

#if defined(SUPPORT_SSH_KEYBOARD_RPI)
    // NOTE: Keyboard reading could be done using input_event(s) or just read from stdin, both methods are used here.
    // stdin reading is still used for legacy purposes, it allows keyboard input trough SSH console

    if (!platform.eventKeyboardMode) ProcessKeyboard();
#endif

    // Handle the mouse/touch/gestures events:
    // NOTE: Replaces the EventThread handling that is now commented.
    {
        int fd = platform.mouseFd;
        if (fd == -1) return;

        struct input_event event = { 0 };

        int touchAction = -1;           // 0-TOUCH_ACTION_UP, 1-TOUCH_ACTION_DOWN, 2-TOUCH_ACTION_MOVE

        // Try to read data from the mouse/touch/gesture and only continue if successful
        while (read(fd, &event, sizeof(event)) == (int)sizeof(event))
        {
            // Relative movement parsing
            if (event.type == EV_REL)
            {
                if (event.code == REL_X)
                {
                    if (platform.cursorRelative)
                    {
                        CORE.Input.Mouse.currentPosition.x = event.value;
                        CORE.Input.Mouse.previousPosition.x = 0.0f;
                    }
                    else CORE.Input.Mouse.currentPosition.x += event.value;
                    CORE.Input.Touch.position[0].x = CORE.Input.Mouse.currentPosition.x;

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                }

                if (event.code == REL_Y)
                {
                    if (platform.cursorRelative)
                    {
                        CORE.Input.Mouse.currentPosition.y = event.value;
                        CORE.Input.Mouse.previousPosition.y = 0.0f;
                    }
                    else CORE.Input.Mouse.currentPosition.y += event.value;
                    CORE.Input.Touch.position[0].y = CORE.Input.Mouse.currentPosition.y;

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                }

                if (event.code == REL_WHEEL) platform.eventWheelMove.y += event.value;
            }

            // Absolute movement parsing
            if (event.type == EV_ABS)
            {
                // Basic movement
                if (event.code == ABS_X)
                {
                    CORE.Input.Mouse.currentPosition.x = (event.value - platform.absRange.x)*CORE.Window.screen.width/platform.absRange.width;    // Scale according to absRange
                    CORE.Input.Touch.position[0].x = (event.value - platform.absRange.x)*CORE.Window.screen.width/platform.absRange.width;        // Scale according to absRange

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                }

                if (event.code == ABS_Y)
                {
                    CORE.Input.Mouse.currentPosition.y = (event.value - platform.absRange.y)*CORE.Window.screen.height/platform.absRange.height;  // Scale according to absRange
                    CORE.Input.Touch.position[0].y = (event.value - platform.absRange.y)*CORE.Window.screen.height/platform.absRange.height;      // Scale according to absRange

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                }

                // Multitouch movement
                if (event.code == ABS_MT_SLOT) platform.touchSlot = event.value;   // Remember the slot number for the folowing events

                if (event.code == ABS_MT_POSITION_X)
                {
                    if (platform.touchSlot < MAX_TOUCH_POINTS) CORE.Input.Touch.position[platform.touchSlot].x = (event.value - platform.absRange.x)*CORE.Window.screen.width/platform.absRange.width;    // Scale according to absRange
                }

                if (event.code == ABS_MT_POSITION_Y)
                {
                    if (platform.touchSlot < MAX_TOUCH_POINTS) CORE.Input.Touch.position[platform.touchSlot].y = (event.value - platform.absRange.y)*CORE.Window.screen.height/platform.absRange.height;  // Scale according to absRange
                }

                if (event.code == ABS_MT_TRACKING_ID)
                {
                    if ((event.value < 0) && (platform.touchSlot < MAX_TOUCH_POINTS))
                    {
                        // Touch has ended for this point
                        CORE.Input.Touch.position[platform.touchSlot].x = -1;
                        CORE.Input.Touch.position[platform.touchSlot].y = -1;
                    }
                }

                // Touchscreen tap
                if (event.code == ABS_PRESSURE)
                {
                    int previousMouseLeftButtonState = platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT];

                    if (!event.value && previousMouseLeftButtonState)
                    {
                        platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = 0;

                        touchAction = 0;    // TOUCH_ACTION_UP
                    }

                    if (event.value && !previousMouseLeftButtonState)
                    {
                        platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = 1;

                        touchAction = 1;    // TOUCH_ACTION_DOWN
                    }
                }

            }

            // Button parsing
            if (event.type == EV_KEY)
            {
                // Mouse button parsing
                if ((event.code == BTN_TOUCH) || (event.code == BTN_LEFT))
                {
                    platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = event.value;

                    if (event.value > 0) touchAction = 1;   // TOUCH_ACTION_DOWN
                    else touchAction = 0;       // TOUCH_ACTION_UP
                }

                if (event.code == BTN_RIGHT) platform.currentButtonStateEvdev[MOUSE_BUTTON_RIGHT] = event.value;
                if (event.code == BTN_MIDDLE) platform.currentButtonStateEvdev[MOUSE_BUTTON_MIDDLE] = event.value;
                if (event.code == BTN_SIDE) platform.currentButtonStateEvdev[MOUSE_BUTTON_SIDE] = event.value;
                if (event.code == BTN_EXTRA) platform.currentButtonStateEvdev[MOUSE_BUTTON_EXTRA] = event.value;
                if (event.code == BTN_FORWARD) platform.currentButtonStateEvdev[MOUSE_BUTTON_FORWARD] = event.value;
                if (event.code == BTN_BACK) platform.currentButtonStateEvdev[MOUSE_BUTTON_BACK] = event.value;
            }

            // Screen confinement
            if (!CORE.Input.Mouse.cursorHidden)
            {
                if (CORE.Input.Mouse.currentPosition.x < 0) CORE.Input.Mouse.currentPosition.x = 0;
                if (CORE.Input.Mouse.currentPosition.x > CORE.Window.screen.width/CORE.Input.Mouse.scale.x) CORE.Input.Mouse.currentPosition.x = CORE.Window.screen.width/CORE.Input.Mouse.scale.x;

                if (CORE.Input.Mouse.currentPosition.y < 0) CORE.Input.Mouse.currentPosition.y = 0;
                if (CORE.Input.Mouse.currentPosition.y > CORE.Window.screen.height/CORE.Input.Mouse.scale.y) CORE.Input.Mouse.currentPosition.y = CORE.Window.screen.height/CORE.Input.Mouse.scale.y;
            }

            // Update touch point count
            CORE.Input.Touch.pointCount = 0;
            for (int i = 0; i < MAX_TOUCH_POINTS; i++)
            {
                if (CORE.Input.Touch.position[i].x >= 0) CORE.Input.Touch.pointCount++;
            }

#if defined(SUPPORT_GESTURES_SYSTEM)
            if (touchAction > -1)
            {
                GestureEvent gestureEvent = { 0 };

                gestureEvent.touchAction = touchAction;
                gestureEvent.pointCount = CORE.Input.Touch.pointCount;

                for (int i = 0; i < MAX_TOUCH_POINTS; i++)
                {
                    gestureEvent.pointId[i] = i;
                    gestureEvent.position[i] = CORE.Input.Touch.position[i];
                }

                ProcessGestureEvent(gestureEvent);

                touchAction = -1;
            }
#endif
        }
    }
}

//----------------------------------------------------------------------------------
// Module Internal Functions Definition
//----------------------------------------------------------------------------------

// Initialize platform: graphics, inputs and more
int InitPlatform(void)
{
    platform.fd = -1;
    platform.connector = NULL;
    platform.modeIndex = -1;
    platform.crtc = NULL;
    platform.gbmDevice = NULL;
    platform.gbmSurface = NULL;
    platform.prevBO = NULL;
    platform.prevFB = 0;

    // Initialize graphic device: display/window and graphic context
    //----------------------------------------------------------------------------
    CORE.Window.fullscreen = true;
    CORE.Window.flags |= FLAG_FULLSCREEN_MODE;

#if defined(DEFAULT_GRAPHIC_DEVICE_DRM)
    platform.fd = open(DEFAULT_GRAPHIC_DEVICE_DRM, O_RDWR);
#else
    TRACELOG(LOG_INFO, "DISPLAY: No graphic card set, trying platform-gpu-card");
    platform.fd = open("/dev/dri/by-path/platform-gpu-card",  O_RDWR); // VideoCore VI (Raspberry Pi 4)

    if ((platform.fd == -1) || (drmModeGetResources(platform.fd) == NULL))
    {
        TRACELOG(LOG_INFO, "DISPLAY: Failed to open platform-gpu-card, trying card1");
        platform.fd = open("/dev/dri/card1", O_RDWR); // Other Embedded
    }

    if ((platform.fd == -1) || (drmModeGetResources(platform.fd) == NULL))
    {
        TRACELOG(LOG_INFO, "DISPLAY: Failed to open graphic card1, trying card0");
        platform.fd = open("/dev/dri/card0", O_RDWR); // VideoCore IV (Raspberry Pi 1-3)
    }
#endif

    if (platform.fd == -1)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to open graphic card");
        return -1;
    }

    drmModeRes *res = drmModeGetResources(platform.fd);
    if (!res)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed get DRM resources");
        return -1;
    }

    TRACELOG(LOG_TRACE, "DISPLAY: Connectors found: %i", res->count_connectors);

    for (size_t i = 0; i < res->count_connectors; i++)
    {
        TRACELOG(LOG_TRACE, "DISPLAY: Connector index %i", i);

        drmModeConnector *con = drmModeGetConnector(platform.fd, res->connectors[i]);
        TRACELOG(LOG_TRACE, "DISPLAY: Connector modes detected: %i", con->count_modes);

        if ((con->connection == DRM_MODE_CONNECTED) && (con->encoder_id))
        {
            TRACELOG(LOG_TRACE, "DISPLAY: DRM mode connected");
            platform.connector = con;
            break;
        }
        else
        {
            TRACELOG(LOG_TRACE, "DISPLAY: DRM mode NOT connected (deleting)");
            drmModeFreeConnector(con);
        }
    }

    if (!platform.connector)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: No suitable DRM connector found");
        drmModeFreeResources(res);
        return -1;
    }

    drmModeEncoder *enc = drmModeGetEncoder(platform.fd, platform.connector->encoder_id);
    if (!enc)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to get DRM mode encoder");
        drmModeFreeResources(res);
        return -1;
    }

    platform.crtc = drmModeGetCrtc(platform.fd, enc->crtc_id);
    if (!platform.crtc)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to get DRM mode crtc");
        drmModeFreeEncoder(enc);
        drmModeFreeResources(res);
        return -1;
    }

    // If InitWindow should use the current mode find it in the connector's mode list
    if ((CORE.Window.screen.width <= 0) || (CORE.Window.screen.height <= 0))
    {
        TRACELOG(LOG_TRACE, "DISPLAY: Selecting DRM connector mode for current used mode...");

        platform.modeIndex = FindMatchingConnectorMode(platform.connector, &platform.crtc->mode);

        if (platform.modeIndex < 0)
        {
            TRACELOG(LOG_WARNING, "DISPLAY: No matching DRM connector mode found");
            drmModeFreeEncoder(enc);
            drmModeFreeResources(res);
            return -1;
        }

        CORE.Window.screen.width = CORE.Window.display.width;
        CORE.Window.screen.height = CORE.Window.display.height;
    }

    const bool allowInterlaced = CORE.Window.flags & FLAG_INTERLACED_HINT;
    const int fps = (CORE.Time.target > 0)? (1.0/CORE.Time.target) : 60;

    // Try to find an exact matching mode
    platform.modeIndex = FindExactConnectorMode(platform.connector, CORE.Window.screen.width, CORE.Window.screen.height, fps, allowInterlaced);

    // If nothing found, try to find a nearly matching mode
    if (platform.modeIndex < 0) platform.modeIndex = FindNearestConnectorMode(platform.connector, CORE.Window.screen.width, CORE.Window.screen.height, fps, allowInterlaced);

    // If nothing found, try to find an exactly matching mode including interlaced
    if (platform.modeIndex < 0) platform.modeIndex = FindExactConnectorMode(platform.connector, CORE.Window.screen.width, CORE.Window.screen.height, fps, true);

    // If nothing found, try to find a nearly matching mode including interlaced
    if (platform.modeIndex < 0) platform.modeIndex = FindNearestConnectorMode(platform.connector, CORE.Window.screen.width, CORE.Window.screen.height, fps, true);

    // If nothing found, there is no suitable mode
    if (platform.modeIndex < 0)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to find a suitable DRM connector mode");
        drmModeFreeEncoder(enc);
        drmModeFreeResources(res);
        return -1;
    }

    CORE.Window.display.width = platform.connector->modes[platform.modeIndex].hdisplay;
    CORE.Window.display.height = platform.connector->modes[platform.modeIndex].vdisplay;

    TRACELOG(LOG_INFO, "DISPLAY: Selected DRM connector mode %s (%ux%u%c@%u)", platform.connector->modes[platform.modeIndex].name,
        platform.connector->modes[platform.modeIndex].hdisplay, platform.connector->modes[platform.modeIndex].vdisplay,
        (platform.connector->modes[platform.modeIndex].flags & DRM_MODE_FLAG_INTERLACE)? 'i' : 'p',
        platform.connector->modes[platform.modeIndex].vrefresh);

    // Use the width and height of the surface for render
    CORE.Window.render.width = CORE.Window.screen.width;
    CORE.Window.render.height = CORE.Window.screen.height;

    drmModeFreeEncoder(enc);
    enc = NULL;

    drmModeFreeResources(res);
    res = NULL;

    platform.gbmDevice = gbm_create_device(platform.fd);
    if (!platform.gbmDevice)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to create GBM device");
        return -1;
    }

    platform.gbmSurface = gbm_surface_create(platform.gbmDevice, platform.connector->modes[platform.modeIndex].hdisplay,
        platform.connector->modes[platform.modeIndex].vdisplay, GBM_FORMAT_ARGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
    if (!platform.gbmSurface)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to create GBM surface");
        return -1;
    }

    EGLint samples = 0;
    EGLint sampleBuffer = 0;
    if (CORE.Window.flags & FLAG_MSAA_4X_HINT)
    {
        samples = 4;
        sampleBuffer = 1;
        TRACELOG(LOG_INFO, "DISPLAY: Trying to enable MSAA x4");
    }

    const EGLint framebufferAttribs[] =
    {
        EGL_RENDERABLE_TYPE, (rlGetVersion() == RL_OPENGL_ES_30)? EGL_OPENGL_ES3_BIT : EGL_OPENGL_ES2_BIT,      // Type of context support
        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,          // Don't use it on Android!
        EGL_RED_SIZE, 8,            // RED color bit depth (alternative: 5)
        EGL_GREEN_SIZE, 8,          // GREEN color bit depth (alternative: 6)
        EGL_BLUE_SIZE, 8,           // BLUE color bit depth (alternative: 5)
        EGL_ALPHA_SIZE, 8,        // ALPHA bit depth (required for transparent framebuffer)
        //EGL_TRANSPARENT_TYPE, EGL_NONE, // Request transparent framebuffer (EGL_TRANSPARENT_RGB does not work on RPI)
        EGL_DEPTH_SIZE, 16,         // Depth buffer size (Required to use Depth testing!)
        //EGL_STENCIL_SIZE, 8,      // Stencil buffer size
        EGL_SAMPLE_BUFFERS, sampleBuffer,    // Activate MSAA
        EGL_SAMPLES, samples,       // 4x Antialiasing if activated (Free on MALI GPUs)
        EGL_NONE
    };

    const EGLint contextAttribs[] = {
        EGL_CONTEXT_CLIENT_VERSION, 2,
        EGL_NONE
    };

    EGLint numConfigs = 0;

    // Get an EGL device connection
    platform.device = eglGetDisplay((EGLNativeDisplayType)platform.gbmDevice);
    if (platform.device == EGL_NO_DISPLAY)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to initialize EGL device");
        return -1;
    }

    // Initialize the EGL device connection
    if (eglInitialize(platform.device, NULL, NULL) == EGL_FALSE)
    {
        // If all of the calls to eglInitialize returned EGL_FALSE then an error has occurred.
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to initialize EGL device");
        return -1;
    }

    if (!eglChooseConfig(platform.device, NULL, NULL, 0, &numConfigs))
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to get EGL config count: 0x%x", eglGetError());
        return -1;
    }

    TRACELOG(LOG_TRACE, "DISPLAY: EGL configs available: %d", numConfigs);

    EGLConfig *configs = RL_CALLOC(numConfigs, sizeof(*configs));
    if (!configs)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to get memory for EGL configs");
        return -1;
    }

    EGLint matchingNumConfigs = 0;
    if (!eglChooseConfig(platform.device, framebufferAttribs, configs, numConfigs, &matchingNumConfigs))
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to choose EGL config: 0x%x", eglGetError());
        free(configs);
        return -1;
    }

    TRACELOG(LOG_TRACE, "DISPLAY: EGL matching configs available: %d", matchingNumConfigs);

    // find the EGL config that matches the previously setup GBM format
    int found = 0;
    for (EGLint i = 0; i < matchingNumConfigs; ++i)
    {
        EGLint id = 0;
        if (!eglGetConfigAttrib(platform.device, configs[i], EGL_NATIVE_VISUAL_ID, &id))
        {
            TRACELOG(LOG_WARNING, "DISPLAY: Failed to get EGL config attribute: 0x%x", eglGetError());
            continue;
        }

        if (GBM_FORMAT_ARGB8888 == id)
        {
            TRACELOG(LOG_TRACE, "DISPLAY: Using EGL config: %d", i);
            platform.config = configs[i];
            found = 1;
            break;
        }
    }

    RL_FREE(configs);

    if (!found)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to find a suitable EGL config");
        return -1;
    }

    // Set rendering API
    eglBindAPI(EGL_OPENGL_ES_API);

    // Create an EGL rendering context
    platform.context = eglCreateContext(platform.device, platform.config, EGL_NO_CONTEXT, contextAttribs);
    if (platform.context == EGL_NO_CONTEXT)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to create EGL context");
        return -1;
    }

    // Create an EGL window surface
    platform.surface = eglCreateWindowSurface(platform.device, platform.config, (EGLNativeWindowType)platform.gbmSurface, NULL);
    if (EGL_NO_SURFACE == platform.surface)
    {
        TRACELOG(LOG_WARNING, "DISPLAY: Failed to create EGL window surface: 0x%04x", eglGetError());
        return -1;
    }

    // At this point we need to manage render size vs screen size
    // NOTE: This function use and modify global module variables:
    //  -> CORE.Window.screen.width/CORE.Window.screen.height
    //  -> CORE.Window.render.width/CORE.Window.render.height
    //  -> CORE.Window.screenScale
    SetupFramebuffer(CORE.Window.display.width, CORE.Window.display.height);

    // There must be at least one frame displayed before the buffers are swapped
    //eglSwapInterval(platform.device, 1);

    EGLBoolean result = eglMakeCurrent(platform.device, platform.surface, platform.surface, platform.context);

    // Check surface and context activation
    if (result != EGL_FALSE)
    {
        CORE.Window.ready = true;

        CORE.Window.render.width = CORE.Window.screen.width;
        CORE.Window.render.height = CORE.Window.screen.height;
        CORE.Window.currentFbo.width = CORE.Window.render.width;
        CORE.Window.currentFbo.height = CORE.Window.render.height;

        TRACELOG(LOG_INFO, "DISPLAY: Device initialized successfully");
        TRACELOG(LOG_INFO, "    > Display size: %i x %i", CORE.Window.display.width, CORE.Window.display.height);
        TRACELOG(LOG_INFO, "    > Screen size:  %i x %i", CORE.Window.screen.width, CORE.Window.screen.height);
        TRACELOG(LOG_INFO, "    > Render size:  %i x %i", CORE.Window.render.width, CORE.Window.render.height);
        TRACELOG(LOG_INFO, "    > Viewport offsets: %i, %i", CORE.Window.renderOffset.x, CORE.Window.renderOffset.y);
    }
    else
    {
        TRACELOG(LOG_FATAL, "PLATFORM: Failed to initialize graphics device");
        return -1;
    }

    if ((CORE.Window.flags & FLAG_WINDOW_MINIMIZED) > 0) MinimizeWindow();

    // If graphic device is no properly initialized, we end program
    if (!CORE.Window.ready) { TRACELOG(LOG_FATAL, "PLATFORM: Failed to initialize graphic device"); return -1; }
    else SetWindowPosition(GetMonitorWidth(GetCurrentMonitor()) / 2 - CORE.Window.screen.width / 2, GetMonitorHeight(GetCurrentMonitor()) / 2 - CORE.Window.screen.height / 2);

    // Set some default window flags
    CORE.Window.flags &= ~FLAG_WINDOW_HIDDEN;       // false
    CORE.Window.flags &= ~FLAG_WINDOW_MINIMIZED;    // false
    CORE.Window.flags |= FLAG_WINDOW_MAXIMIZED;     // true
    CORE.Window.flags &= ~FLAG_WINDOW_UNFOCUSED;    // false

    // Load OpenGL extensions
    // NOTE: GL procedures address loader is required to load extensions
    rlLoadExtensions(eglGetProcAddress);
    //----------------------------------------------------------------------------

    // Initialize timming system
    //----------------------------------------------------------------------------
    // NOTE: timming system must be initialized before the input events system
    InitTimer();
    //----------------------------------------------------------------------------

    // Initialize input events system
    //----------------------------------------------------------------------------
    InitEvdevInput();   // Evdev inputs initialization
    InitGamepad();      // Gamepad init
    InitKeyboard();     // Keyboard init (stdin)
    //----------------------------------------------------------------------------

    // Initialize storage system
    //----------------------------------------------------------------------------
    CORE.Storage.basePath = GetWorkingDirectory();
    //----------------------------------------------------------------------------

    TRACELOG(LOG_INFO, "PLATFORM: DRM: Initialized successfully");

    return 0;
}

// Close platform
void ClosePlatform(void)
{
    if (platform.prevFB)
    {
        drmModeRmFB(platform.fd, platform.prevFB);
        platform.prevFB = 0;
    }

    if (platform.prevBO)
    {
        gbm_surface_release_buffer(platform.gbmSurface, platform.prevBO);
        platform.prevBO = NULL;
    }

    if (platform.gbmSurface)
    {
        gbm_surface_destroy(platform.gbmSurface);
        platform.gbmSurface = NULL;
    }

    if (platform.gbmDevice)
    {
        gbm_device_destroy(platform.gbmDevice);
        platform.gbmDevice = NULL;
    }

    if (platform.crtc)
    {
        if (platform.connector)
        {
            drmModeSetCrtc(platform.fd, platform.crtc->crtc_id, platform.crtc->buffer_id,
                platform.crtc->x, platform.crtc->y, &platform.connector->connector_id, 1, &platform.crtc->mode);
            drmModeFreeConnector(platform.connector);
            platform.connector = NULL;
        }

        drmModeFreeCrtc(platform.crtc);
        platform.crtc = NULL;
    }

    if (platform.fd != -1)
    {
        close(platform.fd);
        platform.fd = -1;
    }

    // Close surface, context and display
    if (platform.device != EGL_NO_DISPLAY)
    {
        if (platform.surface != EGL_NO_SURFACE)
        {
            eglDestroySurface(platform.device, platform.surface);
            platform.surface = EGL_NO_SURFACE;
        }

        if (platform.context != EGL_NO_CONTEXT)
        {
            eglDestroyContext(platform.device, platform.context);
            platform.context = EGL_NO_CONTEXT;
        }

        eglTerminate(platform.device);
        platform.device = EGL_NO_DISPLAY;
    }

    // Wait for mouse and gamepad threads to finish before closing
    // NOTE: Those threads should already have finished at this point
    // because they are controlled by CORE.Window.shouldClose variable

    CORE.Window.shouldClose = true;   // Added to force threads to exit when the close window is called

    // Close the evdev keyboard
    if (platform.keyboardFd != -1)
    {
        close(platform.keyboardFd);
        platform.keyboardFd = -1;
    }

    for (int i = 0; i < sizeof(platform.eventWorker)/sizeof(InputEventWorker); ++i)
    {
        if (platform.eventWorker[i].threadId)
        {
            pthread_join(platform.eventWorker[i].threadId, NULL);
        }
    }
}

// Initialize Keyboard system (using standard input)
static void InitKeyboard(void)
{
    // NOTE: We read directly from Standard Input (stdin) - STDIN_FILENO file descriptor,
    // Reading directly from stdin will give chars already key-mapped by kernel to ASCII or UNICODE

    // Save terminal keyboard settings
    tcgetattr(STDIN_FILENO, &platform.defaultSettings);

    // Reconfigure terminal with new settings
    struct termios keyboardNewSettings = { 0 };
    keyboardNewSettings = platform.defaultSettings;

    // New terminal settings for keyboard: turn off buffering (non-canonical mode), echo and key processing
    // NOTE: ISIG controls if ^C and ^Z generate break signals or not
    keyboardNewSettings.c_lflag &= ~(ICANON | ECHO | ISIG);
    //keyboardNewSettings.c_iflag &= ~(ISTRIP | INLCR | ICRNL | IGNCR | IXON | IXOFF);
    keyboardNewSettings.c_cc[VMIN] = 1;
    keyboardNewSettings.c_cc[VTIME] = 0;

    // Set new keyboard settings (change occurs immediately)
    tcsetattr(STDIN_FILENO, TCSANOW, &keyboardNewSettings);

    // Save old keyboard mode to restore it at the end
    platform.defaultFileFlags = fcntl(STDIN_FILENO, F_GETFL, 0);          // F_GETFL: Get the file access mode and the file status flags
    fcntl(STDIN_FILENO, F_SETFL, platform.defaultFileFlags | O_NONBLOCK); // F_SETFL: Set the file status flags to the value specified

    // NOTE: If ioctl() returns -1, it means the call failed for some reason (error code set in errno)
    int result = ioctl(STDIN_FILENO, KDGKBMODE, &platform.defaultKeyboardMode);

    // In case of failure, it could mean a remote keyboard is used (SSH)
    if (result < 0) TRACELOG(LOG_WARNING, "RPI: Failed to change keyboard mode, an SSH keyboard is probably used");
    else
    {
        // Reconfigure keyboard mode to get:
        //    - scancodes (K_RAW)
        //    - keycodes (K_MEDIUMRAW)
        //    - ASCII chars (K_XLATE)
        //    - UNICODE chars (K_UNICODE)
        ioctl(STDIN_FILENO, KDSKBMODE, K_XLATE);  // ASCII chars
    }

    // Register keyboard restore when program finishes
    atexit(RestoreKeyboard);
}

// Restore default keyboard input
static void RestoreKeyboard(void)
{
    // Reset to default keyboard settings
    tcsetattr(STDIN_FILENO, TCSANOW, &platform.defaultSettings);

    // Reconfigure keyboard to default mode
    fcntl(STDIN_FILENO, F_SETFL, platform.defaultFileFlags);
    ioctl(STDIN_FILENO, KDSKBMODE, platform.defaultKeyboardMode);
}

#if defined(SUPPORT_SSH_KEYBOARD_RPI)
// Process keyboard inputs
static void ProcessKeyboard(void)
{
    #define MAX_KEYBUFFER_SIZE      32      // Max size in bytes to read

    // Keyboard input polling (fill keys[256] array with status)
    int bufferByteCount = 0;                        // Bytes available on the buffer
    char keysBuffer[MAX_KEYBUFFER_SIZE] = { 0 };    // Max keys to be read at a time

    // Read availables keycodes from stdin
    bufferByteCount = read(STDIN_FILENO, keysBuffer, MAX_KEYBUFFER_SIZE);     // POSIX system call

    // Reset pressed keys array (it will be filled below)
    for (int i = 0; i < MAX_KEYBOARD_KEYS; i++)
    {
        CORE.Input.Keyboard.currentKeyState[i] = 0;
        CORE.Input.Keyboard.keyRepeatInFrame[i] = 0;
    }

    // Fill all read bytes (looking for keys)
    for (int i = 0; i < bufferByteCount; i++)
    {
        // NOTE: If (key == 0x1b), depending on next key, it could be a special keymap code!
        // Up -> 1b 5b 41 / Left -> 1b 5b 44 / Right -> 1b 5b 43 / Down -> 1b 5b 42
        if (keysBuffer[i] == 0x1b)
        {
            // Check if ESCAPE key has been pressed to stop program
            if (bufferByteCount == 1) CORE.Input.Keyboard.currentKeyState[CORE.Input.Keyboard.exitKey] = 1;
            else
            {
                if (keysBuffer[i + 1] == 0x5b)    // Special function key
                {
                    if ((keysBuffer[i + 2] == 0x5b) || (keysBuffer[i + 2] == 0x31) || (keysBuffer[i + 2] == 0x32))
                    {
                        // Process special function keys (F1 - F12)
                        switch (keysBuffer[i + 3])
                        {
                            case 0x41: CORE.Input.Keyboard.currentKeyState[290] = 1; break;    // raylib KEY_F1
                            case 0x42: CORE.Input.Keyboard.currentKeyState[291] = 1; break;    // raylib KEY_F2
                            case 0x43: CORE.Input.Keyboard.currentKeyState[292] = 1; break;    // raylib KEY_F3
                            case 0x44: CORE.Input.Keyboard.currentKeyState[293] = 1; break;    // raylib KEY_F4
                            case 0x45: CORE.Input.Keyboard.currentKeyState[294] = 1; break;    // raylib KEY_F5
                            case 0x37: CORE.Input.Keyboard.currentKeyState[295] = 1; break;    // raylib KEY_F6
                            case 0x38: CORE.Input.Keyboard.currentKeyState[296] = 1; break;    // raylib KEY_F7
                            case 0x39: CORE.Input.Keyboard.currentKeyState[297] = 1; break;    // raylib KEY_F8
                            case 0x30: CORE.Input.Keyboard.currentKeyState[298] = 1; break;    // raylib KEY_F9
                            case 0x31: CORE.Input.Keyboard.currentKeyState[299] = 1; break;    // raylib KEY_F10
                            case 0x33: CORE.Input.Keyboard.currentKeyState[300] = 1; break;    // raylib KEY_F11
                            case 0x34: CORE.Input.Keyboard.currentKeyState[301] = 1; break;    // raylib KEY_F12
                            default: break;
                        }

                        if (keysBuffer[i + 2] == 0x5b) i += 4;
                        else if ((keysBuffer[i + 2] == 0x31) || (keysBuffer[i + 2] == 0x32)) i += 5;
                    }
                    else
                    {
                        switch (keysBuffer[i + 2])
                        {
                            case 0x41: CORE.Input.Keyboard.currentKeyState[265] = 1; break;    // raylib KEY_UP
                            case 0x42: CORE.Input.Keyboard.currentKeyState[264] = 1; break;    // raylib KEY_DOWN
                            case 0x43: CORE.Input.Keyboard.currentKeyState[262] = 1; break;    // raylib KEY_RIGHT
                            case 0x44: CORE.Input.Keyboard.currentKeyState[263] = 1; break;    // raylib KEY_LEFT
                            default: break;
                        }

                        i += 3;  // Jump to next key
                    }

                    // NOTE: Some keys are not directly keymapped (CTRL, ALT, SHIFT)
                }
            }
        }
        else if (keysBuffer[i] == 0x0a)     // raylib KEY_ENTER (don't mix with <linux/input.h> KEY_*)
        {
            CORE.Input.Keyboard.currentKeyState[257] = 1;

            CORE.Input.Keyboard.keyPressedQueue[CORE.Input.Keyboard.keyPressedQueueCount] = 257;     // Add keys pressed into queue
            CORE.Input.Keyboard.keyPressedQueueCount++;
        }
        else if (keysBuffer[i] == 0x7f)     // raylib KEY_BACKSPACE
        {
            CORE.Input.Keyboard.currentKeyState[259] = 1;

            CORE.Input.Keyboard.keyPressedQueue[CORE.Input.Keyboard.keyPressedQueueCount] = 257;     // Add keys pressed into queue
            CORE.Input.Keyboard.keyPressedQueueCount++;
        }
        else
        {
            // Translate lowercase a-z letters to A-Z
            if ((keysBuffer[i] >= 97) && (keysBuffer[i] <= 122))
            {
                CORE.Input.Keyboard.currentKeyState[(int)keysBuffer[i] - 32] = 1;
            }
            else CORE.Input.Keyboard.currentKeyState[(int)keysBuffer[i]] = 1;

            CORE.Input.Keyboard.keyPressedQueue[CORE.Input.Keyboard.keyPressedQueueCount] = keysBuffer[i];     // Add keys pressed into queue
            CORE.Input.Keyboard.keyPressedQueueCount++;
        }
    }

    // Check exit key (same functionality as GLFW3 KeyCallback())
    if (CORE.Input.Keyboard.currentKeyState[CORE.Input.Keyboard.exitKey] == 1) CORE.Window.shouldClose = true;

#if defined(SUPPORT_SCREEN_CAPTURE)
    // Check screen capture key (raylib key: KEY_F12)
    if (CORE.Input.Keyboard.currentKeyState[301] == 1)
    {
        TakeScreenshot(TextFormat("screenshot%03i.png", screenshotCounter));
        screenshotCounter++;
    }
#endif
}
#endif  // SUPPORT_SSH_KEYBOARD_RPI

// Initialise user input from evdev(/dev/input/event<N>)
// this means mouse, keyboard or gamepad devices
static void InitEvdevInput(void)
{
    char path[MAX_FILEPATH_LENGTH] = { 0 };
    DIR *directory = NULL;
    struct dirent *entity = NULL;

    // Initialise keyboard file descriptor
    platform.keyboardFd = -1;

    // Reset variables
    for (int i = 0; i < MAX_TOUCH_POINTS; ++i)
    {
        CORE.Input.Touch.position[i].x = -1;
        CORE.Input.Touch.position[i].y = -1;
    }

    // Reset keyboard key state
    for (int i = 0; i < MAX_KEYBOARD_KEYS; i++)
    {
        CORE.Input.Keyboard.currentKeyState[i] = 0;
        CORE.Input.Keyboard.keyRepeatInFrame[i] = 0;
    }

    // Open the linux directory of "/dev/input"
    directory = opendir(DEFAULT_EVDEV_PATH);

    if (directory)
    {
        while ((entity = readdir(directory)) != NULL)
        {
            if ((strncmp("event", entity->d_name, strlen("event")) == 0) ||     // Search for devices named "event*"
                (strncmp("mouse", entity->d_name, strlen("mouse")) == 0))       // Search for devices named "mouse*"
            {
                sprintf(path, "%s%s", DEFAULT_EVDEV_PATH, entity->d_name);
                ConfigureEvdevDevice(path);                                     // Configure the device if appropriate
            }
        }

        closedir(directory);
    }
    else TRACELOG(LOG_WARNING, "RPI: Failed to open linux event directory: %s", DEFAULT_EVDEV_PATH);
}

// Identifies a input device and configures it for use if appropriate
static void ConfigureEvdevDevice(char *device)
{
    #define BITS_PER_LONG   (8*sizeof(long))
    #define NBITS(x)        ((((x) - 1)/BITS_PER_LONG) + 1)
    #define OFF(x)          ((x)%BITS_PER_LONG)
    #define BIT(x)          (1UL<<OFF(x))
    #define LONG(x)         ((x)/BITS_PER_LONG)
    #define TEST_BIT(array, bit) ((array[LONG(bit)] >> OFF(bit)) & 1)

    struct input_absinfo absinfo = { 0 };
    unsigned long evBits[NBITS(EV_MAX)] = { 0 };
    unsigned long absBits[NBITS(ABS_MAX)] = { 0 };
    unsigned long relBits[NBITS(REL_MAX)] = { 0 };
    unsigned long keyBits[NBITS(KEY_MAX)] = { 0 };
    bool hasAbs = false;
    bool hasRel = false;
    bool hasAbsMulti = false;
    int freeWorkerId = -1;
    int fd = -1;

    InputEventWorker *worker = NULL;

    // Open the device and allocate worker
    //-------------------------------------------------------------------------------------------------------
    // Find a free spot in the workers array
    for (int i = 0; i < sizeof(platform.eventWorker)/sizeof(InputEventWorker); ++i)
    {
        if (platform.eventWorker[i].threadId == 0)
        {
            freeWorkerId = i;
            break;
        }
    }

    // Select the free worker from array
    if (freeWorkerId >= 0)
    {
        worker = &(platform.eventWorker[freeWorkerId]);       // Grab a pointer to the worker
        memset(worker, 0, sizeof(InputEventWorker));  // Clear the worker
    }
    else
    {
        TRACELOG(LOG_WARNING, "RPI: Failed to create input device thread for %s, out of worker slots", device);
        return;
    }

    // Open the device
    fd = open(device, O_RDONLY | O_NONBLOCK);
    if (fd < 0)
    {
        TRACELOG(LOG_WARNING, "RPI: Failed to open input device: %s", device);
        return;
    }
    worker->fd = fd;

    // Grab number on the end of the devices name "event<N>"
    int devNum = 0;
    char *ptrDevName = strrchr(device, 't');
    worker->eventNum = -1;

    if (ptrDevName != NULL)
    {
        if (sscanf(ptrDevName, "t%d", &devNum) == 1) worker->eventNum = devNum;
    }
    else worker->eventNum = 0;      // TODO: HACK: Grab number for mouse0 device!

    // At this point we have a connection to the device, but we don't yet know what the device is.
    // It could be many things, even as simple as a power button...
    //-------------------------------------------------------------------------------------------------------

    // Identify the device
    //-------------------------------------------------------------------------------------------------------
    ioctl(fd, EVIOCGBIT(0, sizeof(evBits)), evBits);    // Read a bitfield of the available device properties

    // Check for absolute input devices
    if (TEST_BIT(evBits, EV_ABS))
    {
        ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absBits)), absBits);

        // Check for absolute movement support (usually touchscreens, but also joysticks)
        if (TEST_BIT(absBits, ABS_X) && TEST_BIT(absBits, ABS_Y))
        {
            hasAbs = true;

            // Get the scaling values
            ioctl(fd, EVIOCGABS(ABS_X), &absinfo);
            worker->absRange.x = absinfo.minimum;
            worker->absRange.width = absinfo.maximum - absinfo.minimum;
            platform.absRange.x = absinfo.minimum;
            platform.absRange.width = absinfo.maximum - absinfo.minimum;

            ioctl(fd, EVIOCGABS(ABS_Y), &absinfo);
            worker->absRange.y = absinfo.minimum;
            worker->absRange.height = absinfo.maximum - absinfo.minimum;
            platform.absRange.y = absinfo.minimum;
            platform.absRange.height = absinfo.maximum - absinfo.minimum;
        }

        // Check for multiple absolute movement support (usually multitouch touchscreens)
        if (TEST_BIT(absBits, ABS_MT_POSITION_X) && TEST_BIT(absBits, ABS_MT_POSITION_Y))
        {
            hasAbsMulti = true;

            // Get the scaling values
            ioctl(fd, EVIOCGABS(ABS_X), &absinfo);
            worker->absRange.x = absinfo.minimum;
            worker->absRange.width = absinfo.maximum - absinfo.minimum;
            platform.absRange.x = absinfo.minimum;
            platform.absRange.width = absinfo.maximum - absinfo.minimum;

            ioctl(fd, EVIOCGABS(ABS_Y), &absinfo);
            worker->absRange.y = absinfo.minimum;
            worker->absRange.height = absinfo.maximum - absinfo.minimum;
            platform.absRange.y = absinfo.minimum;
            platform.absRange.height = absinfo.maximum - absinfo.minimum;
        }
    }

    // Check for relative movement support (usually mouse)
    if (TEST_BIT(evBits, EV_REL))
    {
        ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relBits)), relBits);

        if (TEST_BIT(relBits, REL_X) && TEST_BIT(relBits, REL_Y)) hasRel = true;
    }

    // Check for button support to determine the device type(usually on all input devices)
    if (TEST_BIT(evBits, EV_KEY))
    {
        ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keyBits)), keyBits);

        if (hasAbs || hasAbsMulti)
        {
            if (TEST_BIT(keyBits, BTN_TOUCH)) worker->isTouch = true;          // This is a touchscreen
            if (TEST_BIT(keyBits, BTN_TOOL_FINGER)) worker->isTouch = true;    // This is a drawing tablet
            if (TEST_BIT(keyBits, BTN_TOOL_PEN)) worker->isTouch = true;       // This is a drawing tablet
            if (TEST_BIT(keyBits, BTN_STYLUS)) worker->isTouch = true;         // This is a drawing tablet
            if (worker->isTouch || hasAbsMulti) worker->isMultitouch = true;   // This is a multitouch capable device
        }

        if (hasRel)
        {
            if (TEST_BIT(keyBits, BTN_LEFT)) worker->isMouse = true;           // This is a mouse
            if (TEST_BIT(keyBits, BTN_RIGHT)) worker->isMouse = true;          // This is a mouse
        }

        if (TEST_BIT(keyBits, BTN_A)) worker->isGamepad = true;                // This is a gamepad
        if (TEST_BIT(keyBits, BTN_TRIGGER)) worker->isGamepad = true;          // This is a gamepad
        if (TEST_BIT(keyBits, BTN_START)) worker->isGamepad = true;            // This is a gamepad
        if (TEST_BIT(keyBits, BTN_TL)) worker->isGamepad = true;               // This is a gamepad
        if (TEST_BIT(keyBits, BTN_TL)) worker->isGamepad = true;               // This is a gamepad

        if (TEST_BIT(keyBits, KEY_SPACE)) worker->isKeyboard = true;           // This is a keyboard
    }
    //-------------------------------------------------------------------------------------------------------

    // Decide what to do with the device
    //-------------------------------------------------------------------------------------------------------
    if (worker->isKeyboard && (platform.keyboardFd == -1))
    {
        // Use the first keyboard encountered. This assumes that a device that says it's a keyboard is just a
        // keyboard. The keyboard is polled synchronously, whereas other input devices are polled in separate
        // threads so that they don't drop events when the frame rate is slow.
        TRACELOG(LOG_INFO, "RPI: Opening keyboard device: %s", device);
        platform.keyboardFd = worker->fd;
    }
    else if (worker->isTouch || worker->isMouse)
    {
        // Looks like an interesting device
        TRACELOG(LOG_INFO, "RPI: Opening input device: %s (%s%s%s%s)", device,
            worker->isMouse? "mouse " : "",
            worker->isMultitouch? "multitouch " : "",
            worker->isTouch? "touchscreen " : "",
            worker->isGamepad? "gamepad " : "");
        platform.mouseFd = worker->fd;

        // NOTE: moved the mouse/touch/gesture input to PollInputEvents()/
        //       so added the "platform.mouseFd = worker->fd;" line above
        //       and commented the thread code below:

        // Create a thread for this device
        //int error = pthread_create(&worker->threadId, NULL, &EventThread, (void *)worker);
        //if (error != 0)
        //{
        //    TRACELOG(LOG_WARNING, "RPI: Failed to create input device thread: %s (error: %d)", device, error);
        //    worker->threadId = 0;
        //    close(fd);
        //}

#if defined(USE_LAST_TOUCH_DEVICE)
        // Find touchscreen with the highest index
        int maxTouchNumber = -1;

        for (int i = 0; i < sizeof(platform.eventWorker)/sizeof(InputEventWorker); ++i)
        {
            if (platform.eventWorker[i].isTouch && (platform.eventWorker[i].eventNum > maxTouchNumber)) maxTouchNumber = platform.eventWorker[i].eventNum;
        }

        // Find touchscreens with lower indexes
        for (int i = 0; i < sizeof(platform.eventWorker)/sizeof(InputEventWorker); ++i)
        {
            if (platform.eventWorker[i].isTouch && (platform.eventWorker[i].eventNum < maxTouchNumber))
            {
                if (platform.eventWorker[i].threadId != 0)
                {
                    TRACELOG(LOG_WARNING, "RPI: Found duplicate touchscreen, killing touchscreen on event: %d", i);
                    pthread_cancel(platform.eventWorker[i].threadId);
                    close(platform.eventWorker[i].fd);
                }
            }
        }
#endif
    }
    else close(fd);  // We are not interested in this device
    //-------------------------------------------------------------------------------------------------------
}

// Poll and process evdev keyboard events
static void PollKeyboardEvents(void)
{
    int fd = platform.keyboardFd;
    if (fd == -1) return;

    struct input_event event = { 0 };
    int keycode = -1;

    // Try to read data from the keyboard and only continue if successful
    while (read(fd, &event, sizeof(event)) == (int)sizeof(event))
    {
        // Button parsing
        if (event.type == EV_KEY)
        {
#if defined(SUPPORT_SSH_KEYBOARD_RPI)
            // Change keyboard mode to events
            platform.eventKeyboardMode = true;
#endif
            // Keyboard button parsing
            if ((event.code >= 1) && (event.code <= 255))     //Keyboard keys appear for codes 1 to 255
            {
                keycode = keymapUS[event.code & 0xFF];     // The code we get is a scancode so we look up the appropriate keycode

                // Make sure we got a valid keycode
                if ((keycode > 0) && (keycode < sizeof(CORE.Input.Keyboard.currentKeyState)))
                {
                    // WARNING: https://www.kernel.org/doc/Documentation/input/input.txt
                    // Event interface: 'value' is the value the event carries. Either a relative change for EV_REL,
                    // absolute new value for EV_ABS (joysticks ...), or 0 for EV_KEY for release, 1 for keypress and 2 for autorepeat
                    CORE.Input.Keyboard.currentKeyState[keycode] = (event.value >= 1)? 1 : 0;
                    CORE.Input.Keyboard.keyRepeatInFrame[keycode] = (event.value == 2)? 1 : 0;
                    if (event.value >= 1)
                    {
                        CORE.Input.Keyboard.keyPressedQueue[CORE.Input.Keyboard.keyPressedQueueCount] = keycode;     // Register last key pressed
                        CORE.Input.Keyboard.keyPressedQueueCount++;
                    }

                #if defined(SUPPORT_SCREEN_CAPTURE)
                    // Check screen capture key (raylib key: KEY_F12)
                    if (CORE.Input.Keyboard.currentKeyState[301] == 1)
                    {
                        TakeScreenshot(TextFormat("screenshot%03i.png", screenshotCounter));
                        screenshotCounter++;
                    }
                #endif

                    // Detect char presses (unicode)
                    if (event.value == 1)
                    {
                        // Check if there is space available in the queue
                        if (CORE.Input.Keyboard.charPressedQueueCount < MAX_CHAR_PRESSED_QUEUE)
                        {
                            // Add character to the queue
                            CORE.Input.Keyboard.charPressedQueue[CORE.Input.Keyboard.charPressedQueueCount] = EvkeyToUnicodeLUT[event.code];
                            CORE.Input.Keyboard.charPressedQueueCount++;
                        }
                    }

                    if (CORE.Input.Keyboard.currentKeyState[CORE.Input.Keyboard.exitKey] == 1) CORE.Window.shouldClose = true;

                    TRACELOGD("RPI: KEY_%s ScanCode: %4i KeyCode: %4i", (event.value == 0)? "UP" : "DOWN", event.code, keycode);
                }
            }
        }
    }
}

// Input device events reading thread
static void *EventThread(void *arg)
{
/*
    struct input_event event = { 0 };
    InputEventWorker *worker = (InputEventWorker *)arg;

    int touchAction = -1;           // 0-TOUCH_ACTION_UP, 1-TOUCH_ACTION_DOWN, 2-TOUCH_ACTION_MOVE
    bool gestureUpdate = false;     // Flag to note gestures require to update

    while (!CORE.Window.shouldClose)
    {
        // Try to read data from the device and only continue if successful
        while (read(worker->fd, &event, sizeof(event)) == (int)sizeof(event))
        {
            // Relative movement parsing
            if (event.type == EV_REL)
            {
                if (event.code == REL_X)
                {
                    if (platform.cursorRelative)
                    {
                        CORE.Input.Mouse.currentPosition.x -= event.value;
                        CORE.Input.Touch.position[0].x = CORE.Input.Mouse.currentPosition.x;
                    }
                    else
                    {
                        CORE.Input.Mouse.currentPosition.x += event.value;
                        CORE.Input.Touch.position[0].x = CORE.Input.Mouse.currentPosition.x;
                    }

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                    gestureUpdate = true;
                }

                if (event.code == REL_Y)
                {
                    if (platform.cursorRelative)
                    {
                        CORE.Input.Mouse.currentPosition.y -= event.value;
                        CORE.Input.Touch.position[0].y = CORE.Input.Mouse.currentPosition.y;
                    }
                    else
                    {
                        CORE.Input.Mouse.currentPosition.y += event.value;
                        CORE.Input.Touch.position[0].y = CORE.Input.Mouse.currentPosition.y;
                    }

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                    gestureUpdate = true;
                }

                if (event.code == REL_WHEEL) platform.eventWheelMove.y += event.value;
            }

            // Absolute movement parsing
            if (event.type == EV_ABS)
            {
                // Basic movement
                if (event.code == ABS_X)
                {
                    CORE.Input.Mouse.currentPosition.x = (event.value - worker->absRange.x)*CORE.Window.screen.width/worker->absRange.width;    // Scale according to absRange
                    CORE.Input.Touch.position[0].x = (event.value - worker->absRange.x)*CORE.Window.screen.width/worker->absRange.width;        // Scale according to absRange

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                    gestureUpdate = true;
                }

                if (event.code == ABS_Y)
                {
                    CORE.Input.Mouse.currentPosition.y = (event.value - worker->absRange.y)*CORE.Window.screen.height/worker->absRange.height;  // Scale according to absRange
                    CORE.Input.Touch.position[0].y = (event.value - worker->absRange.y)*CORE.Window.screen.height/worker->absRange.height;      // Scale according to absRange

                    touchAction = 2;    // TOUCH_ACTION_MOVE
                    gestureUpdate = true;
                }

                // Multitouch movement
                if (event.code == ABS_MT_SLOT) worker->touchSlot = event.value;   // Remember the slot number for the folowing events

                if (event.code == ABS_MT_POSITION_X)
                {
                    if (worker->touchSlot < MAX_TOUCH_POINTS) CORE.Input.Touch.position[worker->touchSlot].x = (event.value - worker->absRange.x)*CORE.Window.screen.width/worker->absRange.width;    // Scale according to absRange
                }

                if (event.code == ABS_MT_POSITION_Y)
                {
                    if (worker->touchSlot < MAX_TOUCH_POINTS) CORE.Input.Touch.position[worker->touchSlot].y = (event.value - worker->absRange.y)*CORE.Window.screen.height/worker->absRange.height;  // Scale according to absRange
                }

                if (event.code == ABS_MT_TRACKING_ID)
                {
                    if ((event.value < 0) && (worker->touchSlot < MAX_TOUCH_POINTS))
                    {
                        // Touch has ended for this point
                        CORE.Input.Touch.position[worker->touchSlot].x = -1;
                        CORE.Input.Touch.position[worker->touchSlot].y = -1;
                    }
                }

                // Touchscreen tap
                if (event.code == ABS_PRESSURE)
                {
                    int previousMouseLeftButtonState = platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT];

                    if (!event.value && previousMouseLeftButtonState)
                    {
                        platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = 0;

                        touchAction = 0;    // TOUCH_ACTION_UP
                        gestureUpdate = true;
                    }

                    if (event.value && !previousMouseLeftButtonState)
                    {
                        platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = 1;

                        touchAction = 1;    // TOUCH_ACTION_DOWN
                        gestureUpdate = true;
                    }
                }

            }

            // Button parsing
            if (event.type == EV_KEY)
            {
                // Mouse button parsing
                if ((event.code == BTN_TOUCH) || (event.code == BTN_LEFT))
                {
                    platform.currentButtonStateEvdev[MOUSE_BUTTON_LEFT] = event.value;

                    if (event.value > 0) touchAction = 1;   // TOUCH_ACTION_DOWN
                    else touchAction = 0;       // TOUCH_ACTION_UP
                    gestureUpdate = true;
                }

                if (event.code == BTN_RIGHT) platform.currentButtonStateEvdev[MOUSE_BUTTON_RIGHT] = event.value;
                if (event.code == BTN_MIDDLE) platform.currentButtonStateEvdev[MOUSE_BUTTON_MIDDLE] = event.value;
                if (event.code == BTN_SIDE) platform.currentButtonStateEvdev[MOUSE_BUTTON_SIDE] = event.value;
                if (event.code == BTN_EXTRA) platform.currentButtonStateEvdev[MOUSE_BUTTON_EXTRA] = event.value;
                if (event.code == BTN_FORWARD) platform.currentButtonStateEvdev[MOUSE_BUTTON_FORWARD] = event.value;
                if (event.code == BTN_BACK) platform.currentButtonStateEvdev[MOUSE_BUTTON_BACK] = event.value;
            }

            // Screen confinement
            if (!CORE.Input.Mouse.cursorHidden)
            {
                if (CORE.Input.Mouse.currentPosition.x < 0) CORE.Input.Mouse.currentPosition.x = 0;
                if (CORE.Input.Mouse.currentPosition.x > CORE.Window.screen.width/CORE.Input.Mouse.scale.x) CORE.Input.Mouse.currentPosition.x = CORE.Window.screen.width/CORE.Input.Mouse.scale.x;

                if (CORE.Input.Mouse.currentPosition.y < 0) CORE.Input.Mouse.currentPosition.y = 0;
                if (CORE.Input.Mouse.currentPosition.y > CORE.Window.screen.height/CORE.Input.Mouse.scale.y) CORE.Input.Mouse.currentPosition.y = CORE.Window.screen.height/CORE.Input.Mouse.scale.y;
            }

            // Update touch point count
            CORE.Input.Touch.pointCount = 0;
            for (int i = 0; i < MAX_TOUCH_POINTS; i++)
            {
                if (CORE.Input.Touch.position[i].x >= 0) CORE.Input.Touch.pointCount++;
            }

#if defined(SUPPORT_GESTURES_SYSTEM)
            if (gestureUpdate)
            {
                GestureEvent gestureEvent = { 0 };

                gestureEvent.touchAction = touchAction;
                gestureEvent.pointCount = CORE.Input.Touch.pointCount;

                for (int i = 0; i < MAX_TOUCH_POINTS; i++)
                {
                    gestureEvent.pointId[i] = i;
                    gestureEvent.position[i] = CORE.Input.Touch.position[i];
                }

                ProcessGestureEvent(gestureEvent);
            }
#endif
        }

        WaitTime(0.005);    // Sleep for 5ms to avoid hogging CPU time
    }

    close(worker->fd);
*/
    return NULL;
}

// Initialize gamepad system
static void InitGamepad(void)
{
    char gamepadDev[128] = { 0 };

    for (int i = 0; i < MAX_GAMEPADS; i++)
    {
        sprintf(gamepadDev, "%s%i", DEFAULT_GAMEPAD_DEV, i);

        if ((platform.gamepadStreamFd[i] = open(gamepadDev, O_RDONLY | O_NONBLOCK)) < 0)
        {
            // NOTE: Only show message for first gamepad
            if (i == 0) TRACELOG(LOG_WARNING, "RPI: Failed to open Gamepad device, no gamepad available");
        }
        else
        {
            CORE.Input.Gamepad.ready[i] = true;

            // NOTE: Only show message for first gamepad
            if (i == 0) TRACELOG(LOG_INFO, "RPI: Gamepad device initialized successfully");

            ioctl(platform.gamepadStreamFd[i], JSIOCGNAME(64), &CORE.Input.Gamepad.name[i]);
            ioctl(platform.gamepadStreamFd[i], JSIOCGAXES, &CORE.Input.Gamepad.axisCount[i]);
        }
    }
}

// Process Gamepad (/dev/input/js0)
static void PollGamepadEvents(void)
{
    #define JS_EVENT_BUTTON         0x01    // Button pressed/released
    #define JS_EVENT_AXIS           0x02    // Joystick axis moved
    #define JS_EVENT_INIT           0x80    // Initial state of device

    struct js_event {
        unsigned int time;      // event timestamp in milliseconds
        short value;            // event value
        unsigned char type;     // event type
        unsigned char number;   // event axis/button number
    };

    // Read gamepad event
    struct js_event gamepadEvent = { 0 };

    for (int i = 0; i < MAX_GAMEPADS; i++)
    {
        if (CORE.Input.Gamepad.ready[i])
        {
            // Register previous gamepad states
            for (int k = 0; k < MAX_GAMEPAD_BUTTONS; k++) CORE.Input.Gamepad.previousButtonState[i][k] = CORE.Input.Gamepad.currentButtonState[i][k];

            while (read(platform.gamepadStreamFd[i], &gamepadEvent, sizeof(struct js_event)) == (int)sizeof(struct js_event))
            {
                gamepadEvent.type &= ~JS_EVENT_INIT;     // Ignore synthetic events

                // Process gamepad events by type
                if (gamepadEvent.type == JS_EVENT_BUTTON)
                {
                    TRACELOG(LOG_DEBUG, "RPI: Gamepad %i button: %i, value: %i", i, gamepadEvent.number, gamepadEvent.value);

                    if (gamepadEvent.number < MAX_GAMEPAD_BUTTONS)
                    {
                        // 1 - button pressed, 0 - button released
                        CORE.Input.Gamepad.currentButtonState[i][gamepadEvent.number] = (int)gamepadEvent.value;

                        if ((int)gamepadEvent.value == 1) CORE.Input.Gamepad.lastButtonPressed = gamepadEvent.number;
                        else CORE.Input.Gamepad.lastButtonPressed = 0;       // GAMEPAD_BUTTON_UNKNOWN
                    }
                }
                else if (gamepadEvent.type == JS_EVENT_AXIS)
                {
                    TRACELOG(LOG_DEBUG, "RPI: Gamepad %i axis: %i, value: %i", i, gamepadEvent.number, gamepadEvent.value);

                    if (gamepadEvent.number < MAX_GAMEPAD_AXIS)
                    {
                        // NOTE: Scaling of gamepadEvent.value to get values between -1..1
                        CORE.Input.Gamepad.axisState[i][gamepadEvent.number] = (float)gamepadEvent.value/32768;
                    }
                }
            }
        }
    }
}

// Search matching DRM mode in connector's mode list
static int FindMatchingConnectorMode(const drmModeConnector *connector, const drmModeModeInfo *mode)
{
    if (NULL == connector) return -1;
    if (NULL == mode) return -1;

    // safe bitwise comparison of two modes
    #define BINCMP(a, b) memcmp((a), (b), (sizeof(a) < sizeof(b))? sizeof(a) : sizeof(b))

    for (size_t i = 0; i < connector->count_modes; i++)
    {
        TRACELOG(LOG_TRACE, "DISPLAY: DRM mode: %d %ux%u@%u %s", i, connector->modes[i].hdisplay, connector->modes[i].vdisplay,
            connector->modes[i].vrefresh, (connector->modes[i].flags & DRM_MODE_FLAG_INTERLACE)? "interlaced" : "progressive");

        if (0 == BINCMP(&platform.crtc->mode, &platform.connector->modes[i])) return i;
    }

    return -1;

    #undef BINCMP
}

// Search exactly matching DRM connector mode in connector's list
static int FindExactConnectorMode(const drmModeConnector *connector, uint width, uint height, uint fps, bool allowInterlaced)
{
    TRACELOG(LOG_TRACE, "DISPLAY: Searching exact connector mode for %ux%u@%u, selecting an interlaced mode is allowed: %s", width, height, fps, allowInterlaced? "yes" : "no");

    if (NULL == connector) return -1;

    for (int i = 0; i < platform.connector->count_modes; i++)
    {
        const drmModeModeInfo *const mode = &platform.connector->modes[i];

        TRACELOG(LOG_TRACE, "DISPLAY: DRM Mode %d %ux%u@%u %s", i, mode->hdisplay, mode->vdisplay, mode->vrefresh, (mode->flags & DRM_MODE_FLAG_INTERLACE)? "interlaced" : "progressive");

        if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && (!allowInterlaced)) continue;

        if ((mode->hdisplay == width) && (mode->vdisplay == height) && (mode->vrefresh == fps)) return i;
    }

    TRACELOG(LOG_TRACE, "DISPLAY: No DRM exact matching mode found");
    return -1;
}

// Search the nearest matching DRM connector mode in connector's list
static int FindNearestConnectorMode(const drmModeConnector *connector, uint width, uint height, uint fps, bool allowInterlaced)
{
    TRACELOG(LOG_TRACE, "DISPLAY: Searching nearest connector mode for %ux%u@%u, selecting an interlaced mode is allowed: %s", width, height, fps, allowInterlaced? "yes" : "no");

    if (NULL == connector) return -1;

    int nearestIndex = -1;
    for (int i = 0; i < platform.connector->count_modes; i++)
    {
        const drmModeModeInfo *const mode = &platform.connector->modes[i];

        TRACELOG(LOG_TRACE, "DISPLAY: DRM mode: %d %ux%u@%u %s", i, mode->hdisplay, mode->vdisplay, mode->vrefresh,
            (mode->flags & DRM_MODE_FLAG_INTERLACE)? "interlaced" : "progressive");

        if ((mode->hdisplay < width) || (mode->vdisplay < height))
        {
            TRACELOG(LOG_TRACE, "DISPLAY: DRM mode is too small");
            continue;
        }

        if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && (!allowInterlaced))
        {
            TRACELOG(LOG_TRACE, "DISPLAY: DRM shouldn't choose an interlaced mode");
            continue;
        }

        if (nearestIndex < 0)
        {
            nearestIndex = i;
            continue;
        }

        const int widthDiff = abs(mode->hdisplay - width);
        const int heightDiff = abs(mode->vdisplay - height);
        const int fpsDiff = abs(mode->vrefresh - fps);

        const int nearestWidthDiff = abs(platform.connector->modes[nearestIndex].hdisplay - width);
        const int nearestHeightDiff = abs(platform.connector->modes[nearestIndex].vdisplay - height);
        const int nearestFpsDiff = abs(platform.connector->modes[nearestIndex].vrefresh - fps);

        if ((widthDiff < nearestWidthDiff) || (heightDiff < nearestHeightDiff) || (fpsDiff < nearestFpsDiff)) {
            nearestIndex = i;
        }
    }

    return nearestIndex;
}

// EOF