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linux: Reduce magic numbers when mapping gamepad axes 

The bitfield `mapped` has two different sets of meanings, depending
whether we're setting up the triggers or the d-pad. Represent them
as symbolic constants rather than opaque integers.

Signed-off-by: Simon McVittie <smcv@collabora.com>
main
Simon McVittie 2023-06-09 13:06:30 +01:00 committed by Sam Lantinga
parent dec0dbff13
commit c4d49fadd4
1 changed files with 28 additions and 17 deletions
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45
src/joystick/linux/SDL_sysjoystick.c
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@ -1613,6 +1613,17 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
{
SDL_Joystick *joystick;
SDL_joylist_item *item = GetJoystickByDevIndex(device_index);
enum {
MAPPED_TRIGGER_LEFT = 0x1,
MAPPED_TRIGGER_RIGHT = 0x2,
MAPPED_TRIGGER_BOTH = 0x3,
MAPPED_DPAD_UP = 0x1,
MAPPED_DPAD_DOWN = 0x2,
MAPPED_DPAD_LEFT = 0x4,
MAPPED_DPAD_RIGHT = 0x8,
MAPPED_DPAD_ALL = 0xF,
};
unsigned int mapped;
SDL_AssertJoysticksLocked();
@ -1820,14 +1831,14 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_abs[ABS_HAT2Y]) {
out->lefttrigger.kind = EMappingKind_Axis;
out->lefttrigger.target = joystick->hwdata->abs_map[ABS_HAT2Y];
mapped |= 0x1;
mapped |= MAPPED_TRIGGER_LEFT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped LEFTTRIGGER to axis %d (ABS_HAT2Y)", out->lefttrigger.target);
#endif
} else if (joystick->hwdata->has_abs[ABS_Z]) {
out->lefttrigger.kind = EMappingKind_Axis;
out->lefttrigger.target = joystick->hwdata->abs_map[ABS_Z];
mapped |= 0x1;
mapped |= MAPPED_TRIGGER_LEFT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped LEFTTRIGGER to axis %d (ABS_Z)", out->lefttrigger.target);
#endif
@ -1836,44 +1847,44 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_abs[ABS_HAT2X]) {
out->righttrigger.kind = EMappingKind_Axis;
out->righttrigger.target = joystick->hwdata->abs_map[ABS_HAT2X];
mapped |= 0x2;
mapped |= MAPPED_TRIGGER_RIGHT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped RIGHTTRIGGER to axis %d (ABS_HAT2X)", out->righttrigger.target);
#endif
} else if (joystick->hwdata->has_abs[ABS_RZ]) {
out->righttrigger.kind = EMappingKind_Axis;
out->righttrigger.target = joystick->hwdata->abs_map[ABS_RZ];
mapped |= 0x2;
mapped |= MAPPED_TRIGGER_RIGHT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped RIGHTTRIGGER to axis %d (ABS_RZ)", out->righttrigger.target);
#endif
}
if (mapped != 0x3 && joystick->hwdata->has_hat[2]) {
if (mapped != MAPPED_TRIGGER_BOTH && joystick->hwdata->has_hat[2]) {
int hat = joystick->hwdata->hats_indices[2] << 4;
out->lefttrigger.kind = EMappingKind_Hat;
out->righttrigger.kind = EMappingKind_Hat;
out->lefttrigger.target = hat | 0x4;
out->righttrigger.target = hat | 0x2;
mapped |= 0x3;
mapped |= MAPPED_TRIGGER_BOTH;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped LEFT+RIGHTTRIGGER to hat 2 (ABS_HAT2X, ABS_HAT2Y)");
#endif
}
if (!(mapped & 0x1) && joystick->hwdata->has_key[BTN_TL2]) {
if (!(mapped & MAPPED_TRIGGER_LEFT) && joystick->hwdata->has_key[BTN_TL2]) {
out->lefttrigger.kind = EMappingKind_Button;
out->lefttrigger.target = joystick->hwdata->key_map[BTN_TL2];
mapped |= 0x1;
mapped |= MAPPED_TRIGGER_LEFT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped LEFTTRIGGER to button %d (BTN_TL2)", out->lefttrigger.target);
#endif
}
if (!(mapped & 0x2) && joystick->hwdata->has_key[BTN_TR2]) {
if (!(mapped & MAPPED_TRIGGER_LEFT) && joystick->hwdata->has_key[BTN_TR2]) {
out->righttrigger.kind = EMappingKind_Button;
out->righttrigger.target = joystick->hwdata->key_map[BTN_TR2];
mapped |= 0x2;
mapped |= MAPPED_TRIGGER_RIGHT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped RIGHTTRIGGER to button %d (BTN_TR2)", out->righttrigger.target);
#endif
@ -1885,7 +1896,7 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_key[BTN_DPAD_UP]) {
out->dpup.kind = EMappingKind_Button;
out->dpup.target = joystick->hwdata->key_map[BTN_DPAD_UP];
mapped |= 0x1;
mapped |= MAPPED_DPAD_UP;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPUP to button %d (BTN_DPAD_UP)", out->dpup.target);
#endif
@ -1894,7 +1905,7 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_key[BTN_DPAD_DOWN]) {
out->dpdown.kind = EMappingKind_Button;
out->dpdown.target = joystick->hwdata->key_map[BTN_DPAD_DOWN];
mapped |= 0x2;
mapped |= MAPPED_DPAD_DOWN;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPDOWN to button %d (BTN_DPAD_DOWN)", out->dpdown.target);
#endif
@ -1903,7 +1914,7 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_key[BTN_DPAD_LEFT]) {
out->dpleft.kind = EMappingKind_Button;
out->dpleft.target = joystick->hwdata->key_map[BTN_DPAD_LEFT];
mapped |= 0x4;
mapped |= MAPPED_DPAD_LEFT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPLEFT to button %d (BTN_DPAD_LEFT)", out->dpleft.target);
#endif
@ -1912,13 +1923,13 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
if (joystick->hwdata->has_key[BTN_DPAD_RIGHT]) {
out->dpright.kind = EMappingKind_Button;
out->dpright.target = joystick->hwdata->key_map[BTN_DPAD_RIGHT];
mapped |= 0x8;
mapped |= MAPPED_DPAD_RIGHT;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPRIGHT to button %d (BTN_DPAD_RIGHT)", out->dpright.target);
#endif
}
if (mapped != 0xF) {
if (mapped != MAPPED_DPAD_ALL) {
if (joystick->hwdata->has_hat[0]) {
int hat = joystick->hwdata->hats_indices[0] << 4;
out->dpleft.kind = EMappingKind_Hat;
@ -1929,7 +1940,7 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
out->dpright.target = hat | 0x2;
out->dpup.target = hat | 0x1;
out->dpdown.target = hat | 0x4;
mapped |= 0xF;
mapped |= MAPPED_DPAD_ALL;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPUP+DOWN+LEFT+RIGHT to hat 0 (ABS_HAT0X, ABS_HAT0Y)");
#endif
@ -1942,7 +1953,7 @@ static SDL_bool LINUX_JoystickGetGamepadMapping(int device_index, SDL_GamepadMap
out->dpright.target = joystick->hwdata->abs_map[ABS_HAT0X];
out->dpup.target = joystick->hwdata->abs_map[ABS_HAT0Y];
out->dpdown.target = joystick->hwdata->abs_map[ABS_HAT0Y];
mapped |= 0xF;
mapped |= MAPPED_DPAD_ALL;
#ifdef DEBUG_GAMEPAD_MAPPING
SDL_Log("Mapped DPUP+DOWN to axis %d (ABS_HAT0Y)", out->dpup.target);
SDL_Log("Mapped DPLEFT+RIGHT to axis %d (ABS_HAT0X)", out->dpleft.target);