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Try to dynamically create a default Android game controller mapping based on the buttons and axes on the controller.

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Include the controller USB VID/PID in the GUID where possible, as we do on other platforms.
This commit is contained in:
Sam Lantinga 2018-03-06 14:51:50 -08:00
parent 2419d26724
commit 9e651b6915
8 changed files with 404 additions and 81 deletions
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146
src/joystick/android/SDL_sysjoystick.c
View file

@ -72,6 +72,28 @@ static int numjoysticks = 0;
static int instance_counter = 0;
/* Public domain CRC implementation adapted from:
http://home.thep.lu.se/~bjorn/crc/crc32_simple.c
*/
static Uint32 crc32_for_byte(Uint32 r)
{
int i;
for(i = 0; i < 8; ++i) {
r = (r & 1? 0: (Uint32)0xEDB88320L) ^ r >> 1;
}
return r ^ (Uint32)0xFF000000L;
}
static Uint32 crc32(const void *data, int count)
{
Uint32 crc = 0;
int i;
for(i = 0; i < count; ++i) {
crc = crc32_for_byte((Uint8)crc ^ ((const Uint8*)data)[i]) ^ crc >> 8;
}
return crc;
}
/* Function to convert Android keyCodes into SDL ones.
* This code manipulation is done to get a sequential list of codes.
* FIXME: This is only suited for the case where we use a fixed number of buttons determined by ANDROID_MAX_NBUTTONS
@ -213,7 +235,7 @@ Android_OnPadDown(int device_id, int keycode)
if (button >= 0) {
item = JoystickByDeviceId(device_id);
if (item && item->joystick) {
SDL_PrivateJoystickButton(item->joystick, button , SDL_PRESSED);
SDL_PrivateJoystickButton(item->joystick, button, SDL_PRESSED);
} else {
SDL_SendKeyboardKey(SDL_PRESSED, button_to_scancode(button));
}
@ -256,16 +278,43 @@ Android_OnJoy(int device_id, int axis, float value)
int
Android_OnHat(int device_id, int hat_id, int x, int y)
{
const Uint8 position_map[3][3] = {
{SDL_HAT_LEFTUP, SDL_HAT_UP, SDL_HAT_RIGHTUP},
{SDL_HAT_LEFT, SDL_HAT_CENTERED, SDL_HAT_RIGHT},
{SDL_HAT_LEFTDOWN, SDL_HAT_DOWN, SDL_HAT_RIGHTDOWN}
};
const int DPAD_UP_MASK = (1 << SDL_CONTROLLER_BUTTON_DPAD_UP);
const int DPAD_DOWN_MASK = (1 << SDL_CONTROLLER_BUTTON_DPAD_DOWN);
const int DPAD_LEFT_MASK = (1 << SDL_CONTROLLER_BUTTON_DPAD_LEFT);
const int DPAD_RIGHT_MASK = (1 << SDL_CONTROLLER_BUTTON_DPAD_RIGHT);
if (x >= -1 && x <=1 && y >= -1 && y <= 1) {
if (x >= -1 && x <= 1 && y >= -1 && y <= 1) {
SDL_joylist_item *item = JoystickByDeviceId(device_id);
if (item && item->joystick) {
SDL_PrivateJoystickHat(item->joystick, hat_id, position_map[y+1][x+1]);
int dpad_state = 0;
int dpad_delta;
if (x < 0) {
dpad_state |= DPAD_LEFT_MASK;
} else if (x > 0) {
dpad_state |= DPAD_RIGHT_MASK;
}
if (y < 0) {
dpad_state |= DPAD_UP_MASK;
} else if (y > 0) {
dpad_state |= DPAD_DOWN_MASK;
}
dpad_delta = (dpad_state ^ item->dpad_state);
if (dpad_delta) {
if (dpad_delta & DPAD_UP_MASK) {
SDL_PrivateJoystickButton(item->joystick, SDL_CONTROLLER_BUTTON_DPAD_UP, (dpad_state & DPAD_UP_MASK) ? SDL_PRESSED : SDL_RELEASED);
}
if (dpad_delta & DPAD_DOWN_MASK) {
SDL_PrivateJoystickButton(item->joystick, SDL_CONTROLLER_BUTTON_DPAD_DOWN, (dpad_state & DPAD_DOWN_MASK) ? SDL_PRESSED : SDL_RELEASED);
}
if (dpad_delta & DPAD_LEFT_MASK) {
SDL_PrivateJoystickButton(item->joystick, SDL_CONTROLLER_BUTTON_DPAD_LEFT, (dpad_state & DPAD_LEFT_MASK) ? SDL_PRESSED : SDL_RELEASED);
}
if (dpad_delta & DPAD_RIGHT_MASK) {
SDL_PrivateJoystickButton(item->joystick, SDL_CONTROLLER_BUTTON_DPAD_RIGHT, (dpad_state & DPAD_RIGHT_MASK) ? SDL_PRESSED : SDL_RELEASED);
}
item->dpad_state = dpad_state;
}
}
return 0;
}
@ -275,10 +324,15 @@ Android_OnHat(int device_id, int hat_id, int x, int y)
int
Android_AddJoystick(int device_id, const char *name, const char *desc, SDL_bool is_accelerometer, int nbuttons, int naxes, int nhats, int nballs)
Android_AddJoystick(int device_id, const char *name, const char *desc, int vendor_id, int product_id, SDL_bool is_accelerometer, int button_mask, int naxes, int nhats, int nballs)
{
SDL_JoystickGUID guid;
const Uint16 BUS_BLUETOOTH = 0x05;
SDL_joylist_item *item;
SDL_JoystickGUID guid;
Uint16 *guid16 = (Uint16 *)guid.data;
int i;
int axis_mask;
if (!SDL_GetHintBoolean(SDL_HINT_TV_REMOTE_AS_JOYSTICK, SDL_TRUE)) {
/* Ignore devices that aren't actually controllers (e.g. remotes), they'll be handled as keyboard input */
@ -291,9 +345,57 @@ Android_AddJoystick(int device_id, const char *name, const char *desc, SDL_bool
return -1;
}
/* the GUID is just the first 16 chars of the name for now */
SDL_zero(guid);
SDL_memcpy(&guid, desc, SDL_min(sizeof(guid), SDL_strlen(desc)));
#ifdef DEBUG_JOYSTICK
SDL_Log("Joystick: %s, descriptor %s, vendor = 0x%.4x, product = 0x%.4x, %d axes, %d hats\n", name, desc, vendor_id, product_id, naxes, nhats);
#endif
/* Add the available buttons and axes
The axis mask should probably come from Java where there is more information about the axes...
*/
axis_mask = 0;
if (!is_accelerometer) {
if (naxes >= 2) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_LEFTX) | (1 << SDL_CONTROLLER_AXIS_LEFTY));
}
if (naxes >= 4) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_RIGHTX) | (1 << SDL_CONTROLLER_AXIS_RIGHTY));
}
if (naxes >= 6) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_TRIGGERLEFT) | (1 << SDL_CONTROLLER_AXIS_TRIGGERRIGHT));
}
}
if (nhats > 0) {
/* Hat is translated into DPAD buttons */
button_mask |= ((1 << SDL_CONTROLLER_BUTTON_DPAD_UP) |
(1 << SDL_CONTROLLER_BUTTON_DPAD_DOWN) |
(1 << SDL_CONTROLLER_BUTTON_DPAD_LEFT) |
(1 << SDL_CONTROLLER_BUTTON_DPAD_RIGHT));
nhats = 0;
}
SDL_memset(guid.data, 0, sizeof(guid.data));
/* We only need 16 bits for each of these; space them out to fill 128. */
/* Byteswap so devices get same GUID on little/big endian platforms. */
*guid16++ = SDL_SwapLE16(BUS_BLUETOOTH);
*guid16++ = 0;
if (vendor_id && product_id) {
*guid16++ = SDL_SwapLE16(vendor_id);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(product_id);
*guid16++ = 0;
} else {
Uint32 crc = crc32(desc, SDL_strlen(desc));
SDL_memcpy(guid16, desc, SDL_min(2*sizeof(*guid16), SDL_strlen(desc)));
guid16 += 2;
*(Uint32 *)guid16 = SDL_SwapLE32(crc);
guid16 += 2;
}
*guid16++ = SDL_SwapLE16(button_mask);
*guid16++ = SDL_SwapLE16(axis_mask);
item = (SDL_joylist_item *) SDL_malloc(sizeof (SDL_joylist_item));
if (item == NULL) {
@ -310,11 +412,14 @@ Android_AddJoystick(int device_id, const char *name, const char *desc, SDL_bool
}
item->is_accelerometer = is_accelerometer;
if (nbuttons > -1) {
item->nbuttons = nbuttons;
}
else {
if (button_mask == 0xFFFFFFFF) {
item->nbuttons = ANDROID_MAX_NBUTTONS;
} else {
for (i = 0; i < sizeof(button_mask)*8; ++i) {
if (button_mask & (1 << i)) {
item->nbuttons = i+1;
}
}
}
item->naxes = naxes;
item->nhats = nhats;
@ -467,7 +572,7 @@ SDL_SYS_JoystickInit(void)
if (SDL_GetHintBoolean(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, SDL_TRUE)) {
/* Default behavior, accelerometer as joystick */
Android_AddJoystick(ANDROID_ACCELEROMETER_DEVICE_ID, ANDROID_ACCELEROMETER_NAME, ANDROID_ACCELEROMETER_NAME, SDL_TRUE, 0, 3, 0, 0);
Android_AddJoystick(ANDROID_ACCELEROMETER_DEVICE_ID, ANDROID_ACCELEROMETER_NAME, ANDROID_ACCELEROMETER_NAME, 0, 0, SDL_TRUE, 0, 3, 0, 0);
}
SDL_InitSteamControllers(SteamControllerConnectedCallback,
@ -677,11 +782,6 @@ SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
return guid;
}
SDL_bool SDL_SYS_IsDPAD_DeviceIndex(int device_index)
{
return JoystickByDevIndex(device_index)->naxes == 0;
}
#endif /* SDL_JOYSTICK_ANDROID */
/* vi: set ts=4 sw=4 expandtab: */