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Fix keyboard state change detection on RPI (#1488) 

* Fix keyboard state change detection on RPI

* Rework RaspberryPi evdev keyboard input.

- Extract evdev keyboard handling into PollKeyboardEvents()
- Move keyboard polling to main thread
- Rename EventThreadSpawn() to ConfigureEvdevDevice() as it doesn't necessarily spawn threads
- Remove unused code (KeyEventFifo and lastKeyPressed)

* Replace tabs with 4 spaces.
pull/1516/head
badlydrawnrod 4 years ago
committed by GitHub
parent
22da9087b1
commit
49f9bff260
No known key found for this signature in database GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 84 additions and 66 deletions
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  1. +84
    -66
      src/core.c

+ 84
- 66
src/core.c View File

@ -333,12 +333,6 @@ typedef struct {
bool isKeyboard; // True if device has letter keycodes
bool isGamepad; // True if device has gamepad buttons
} InputEventWorker;
typedef struct {
int contents[8]; // Key events FIFO contents (8 positions)
char head; // Key events FIFO head position
char tail; // Key events FIFO tail position
} KeyEventFifo;
#endif
typedef struct { int x; int y; } Point;
@ -420,7 +414,7 @@ typedef struct CoreData {
#if defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
int defaultMode; // Default keyboard mode
struct termios defaultSettings; // Default keyboard settings
n">KeyEventFifo lastKeyPressed; // Buffer for holding keydown events as they arrive (Needed due to multitreading of event workers)
kt">int fd; // File descriptor for the evdev keyboard
#endif
} Keyboard;
struct {
@ -559,7 +553,8 @@ static void RestoreTerminal(void); // Restore terminal
#endif
static void InitEvdevInput(void); // Evdev inputs initialization
static void EventThreadSpawn(char *device); // Identifies a input device and spawns a thread to handle it if needed
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); // Init raw gamepad input
@ -899,6 +894,13 @@ void CloseWindow(void)
CORE.Window.shouldClose = true; // Added to force threads to exit when the close window is called
// Close the evdev keyboard
if (CORE.Input.Keyboard.fd != -1)
{
close(CORE.Input.Keyboard.fd);
CORE.Input.Keyboard.fd = -1;
}
for (int i = 0; i < sizeof(CORE.Input.eventWorker)/sizeof(InputEventWorker); ++i)
{
if (CORE.Input.eventWorker[i].threadId)
@ -906,6 +908,7 @@ void CloseWindow(void)
pthread_join(CORE.Input.eventWorker[i].threadId, NULL);
}
}
if (CORE.Input.Gamepad.threadId) pthread_join(CORE.Input.Gamepad.threadId, NULL);
#endif
@ -4274,15 +4277,8 @@ static void PollInputEvents(void)
#if defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
// Register previous keys states
for (int i = 0; i < 512; i++) CORE.Input.Keyboard.previousKeyState[i] = CORE.Input.Keyboard.currentKeyState[i];
// Grab a keypress from the evdev fifo if avalable
if (CORE.Input.Keyboard.lastKeyPressed.head != CORE.Input.Keyboard.lastKeyPressed.tail)
{
CORE.Input.Keyboard.keyPressedQueue[CORE.Input.Keyboard.keyPressedQueueCount] = CORE.Input.Keyboard.lastKeyPressed.contents[CORE.Input.Keyboard.lastKeyPressed.tail]; // Read the key from the buffer
CORE.Input.Keyboard.keyPressedQueueCount++;
CORE.Input.Keyboard.lastKeyPressed.tail = (CORE.Input.Keyboard.lastKeyPressed.tail + 1) & 0x07; // Increment the tail pointer forwards and binary wraparound after 7 (fifo is 8 elements long)
}
PollKeyboardEvents();
// Register previous mouse states
CORE.Input.Mouse.previousWheelMove = CORE.Input.Mouse.currentWheelMove;
@ -5352,6 +5348,9 @@ static void InitEvdevInput(void)
char path[MAX_FILEPATH_LENGTH];
DIR *directory;
struct dirent *entity;
// Initialise keyboard file descriptor
CORE.Input.Keyboard.fd = -1;
// Reset variables
for (int i = 0; i < MAX_TOUCH_POINTS; ++i)
@ -5360,10 +5359,6 @@ static void InitEvdevInput(void)
CORE.Input.Touch.position[i].y = -1;
}
// Reset keypress buffer
CORE.Input.Keyboard.lastKeyPressed.head = 0;
CORE.Input.Keyboard.lastKeyPressed.tail = 0;
// Reset keyboard key state
for (int i = 0; i < 512; i++) CORE.Input.Keyboard.currentKeyState[i] = 0;
@ -5377,7 +5372,7 @@ static void InitEvdevInput(void)
if (strncmp("event", entity->d_name, strlen("event")) == 0) // Search for devices named "event*"
{
sprintf(path, "%s%s", DEFAULT_EVDEV_PATH, entity->d_name);
EventThreadSpawn(path); // Identify the device and spawn a thread for it
ConfigureEvdevDevice(path); // Configure the device if appropriate
}
}
@ -5386,8 +5381,8 @@ static void InitEvdevInput(void)
else TRACELOG(LOG_WARNING, "RPI: Failed to open linux event directory: %s", DEFAULT_EVDEV_PATH);
}
// Identifies a input device and spawns a thread to handle it if needed
static void EventThreadSpawn(char *device)
// 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)
@ -5459,7 +5454,7 @@ static void EventThreadSpawn(char *device)
// Identify the device
//-------------------------------------------------------------------------------------------------------
ioctl(fd, EVIOCGBIT(0, sizeof(evBits)), evBits); // Read a bitfield of the avalable device properties
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))
@ -5535,15 +5530,22 @@ static void EventThreadSpawn(char *device)
// Decide what to do with the device
//-------------------------------------------------------------------------------------------------------
if (worker->isTouch || worker->isMouse || worker->isKeyboard)
if (worker->isKeyboard && CORE.Input.Keyboard.fd == -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);
CORE.Input.Keyboard.fd = 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%s)", 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 " : "",
worker->isKeyboard? "keyboard " : "");
worker->isGamepad? "gamepad " : "");
// Create a thread for this device
int error = pthread_create(&worker->threadId, NULL, &EventThread, (void *)worker);
@ -5563,7 +5565,7 @@ static void EventThreadSpawn(char *device)
if (CORE.Input.eventWorker[i].isTouch && (CORE.Input.eventWorker[i].eventNum > maxTouchNumber)) maxTouchNumber = CORE.Input.eventWorker[i].eventNum;
}
// Find toucnscreens with lower indexes
// Find touchscreens with lower indexes
for (int i = 0; i < sizeof(CORE.Input.eventWorker)/sizeof(InputEventWorker); ++i)
{
if (CORE.Input.eventWorker[i].isTouch && (CORE.Input.eventWorker[i].eventNum < maxTouchNumber))
@ -5582,8 +5584,7 @@ static void EventThreadSpawn(char *device)
//-------------------------------------------------------------------------------------------------------
}
// Input device events reading thread
static void *EventThread(void *arg)
static void PollKeyboardEvents(void)
{
// Scancode to keycode mapping for US keyboards
// TODO: Probably replace this with a keymap from the X11 to get the correct regional map for the keyboard:
@ -5605,12 +5606,62 @@ static void *EventThread(void *arg)
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, };
int fd = CORE.Input.Keyboard.fd;
if (fd == -1) return;
struct input_event event;
int keycode;
// 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)
{
// Keyboard button parsing
if ((event.code >= 1) && (event.code <= 255)) //Keyboard keys appear for codes 1 to 255
{
keycode = keymap_US[event.code & 0xFF]; // The code we get is a scancode so we look up the apropriate 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;
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
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;
InputEventWorker *worker = (InputEventWorker *)arg;
int touchAction = -1;
bool gestureUpdate = false;
int keycode;
while (!CORE.Window.shouldClose)
{
@ -5710,39 +5761,6 @@ static void *EventThread(void *arg)
if (event.code == BTN_RIGHT) CORE.Input.Mouse.currentButtonStateEvdev[MOUSE_RIGHT_BUTTON] = event.value;
if (event.code == BTN_MIDDLE) CORE.Input.Mouse.currentButtonStateEvdev[MOUSE_MIDDLE_BUTTON] = event.value;
// Keyboard button parsing
if ((event.code >= 1) && (event.code <= 255)) //Keyboard keys appear for codes 1 to 255
{
keycode = keymap_US[event.code & 0xFF]; // The code we get is a scancode so we look up the apropriate 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;
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
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);
}
}
}
// Screen confinement

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