izanagi-2022/src/packages/game/input/IZ_joystick.c

#include "IZ_joystick.h"

void IZ_JoystickHandleDeviceEvents(IZ_JoystickState* state, SDL_Event e) {
	if (e.type == SDL_JOYDEVICEADDED) {
		if (SDL_NumJoysticks() <= IZ_PLAYERS && !state->device) {
			state->device = SDL_JoystickOpen(e.jdevice.which);
		}
		return;
	}

	if (e.type == SDL_JOYDEVICEREMOVED) {
		if (
			state->device
			&& SDL_JoystickInstanceID(state->device) == e.jdevice.which
		) {
			state->device = NULL;
		}
	}
}

void IZ_JoystickHandleAxisEvents(IZ_JoystickState* state, IZ_Action* action, SDL_Event e) {
	if (e.type == SDL_JOYAXISMOTION) {
		if (
			e.jaxis.axis == IZ_JOY_AXIS_DIRECTION_HORIZONTAL1
			|| e.jaxis.axis == IZ_JOY_AXIS_DIRECTION_HORIZONTAL2
		) {
			*action &= ~(0x1 << IZ_ACTION_INDEX_RIGHT);
			*action &= ~(0x1 << IZ_ACTION_INDEX_LEFT);
			if (e.jaxis.value > state->config.axis_threshold) {
				*action |= (0x1 << IZ_ACTION_INDEX_RIGHT);
				return;
			}
			if (e.jaxis.value <= -state->config.axis_threshold) {
				*action |= (0x1 << IZ_ACTION_INDEX_LEFT);
			}
			return;
		}
		if (
			e.jaxis.axis == IZ_JOY_AXIS_DIRECTION_VERTICAL1
			|| e.jaxis.axis == IZ_JOY_AXIS_DIRECTION_VERTICAL2
		) {
			*action &= ~(0x1 << IZ_ACTION_INDEX_UP);
			*action &= ~(0x1 << IZ_ACTION_INDEX_DOWN);
			if (e.jaxis.value > state->config.axis_threshold) {
				*action |= (0x1 << IZ_ACTION_INDEX_DOWN);
				return;
			}
			if (e.jaxis.value <= -state->config.axis_threshold) {
				*action |= (0x1 << IZ_ACTION_INDEX_UP);
			}
		}
	}
}

void IZ_JoystickHandleHatEvents(IZ_Action* action, SDL_Event e) {
	if (e.type == SDL_JOYHATMOTION) {
		*action &= ~(0x1 << IZ_ACTION_INDEX_UP);
		*action &= ~(0x1 << IZ_ACTION_INDEX_RIGHT);
		*action &= ~(0x1 << IZ_ACTION_INDEX_DOWN);
		*action &= ~(0x1 << IZ_ACTION_INDEX_LEFT);
		if (e.jhat.value != 0) {
			*action |= e.jhat.value;
		}
	}
}

void IZ_JoystickHandleButtonEvents(IZ_JoystickState* state, IZ_Action* action, SDL_Event e) {
	u8 control_index;
	for (control_index = 4; control_index < CONTROLS; control_index += 1) {
		if (e.jbutton.button == state->config.control_mapping[control_index]) {
			const u16 bitflag = (0x1 << control_index);

			if (e.type == SDL_JOYBUTTONDOWN) {
				*action |= bitflag;
				return;
			}

			if (e.type == SDL_JOYBUTTONUP) {
				*action &= ~bitflag;
				return;
			}
		}
	}
}

void IZ_JoystickHandleEvents(IZ_JoystickState(* state)[IZ_PLAYERS], IZ_Action(* action)[IZ_PLAYERS], SDL_Event e) {
	u8 player_index;
	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
		IZ_JoystickHandleDeviceEvents(&(*state)[player_index], e);
		IZ_JoystickHandleAxisEvents(&(*state)[player_index], &(*action)[player_index], e);
		IZ_JoystickHandleHatEvents(&(*action)[player_index], e);
		IZ_JoystickHandleButtonEvents(&(*state)[player_index], &(*action)[player_index], e);
	}
}

void IZ_JoystickLoadConfig(IZ_JoystickState(* state)[IZ_PLAYERS], const char* config_path) {
	char control_mapping_section_name[26];
	char main_section_name[11];

	u8 player_index;
	u8 control_index;
	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
		sprintf_s(control_mapping_section_name, 26, "Joystick.%d.ControlMapping", player_index);

		for (control_index = 4; control_index < CONTROLS; control_index += 1) {
			(*state)[player_index].config.control_mapping[control_index] = ini_getl(
				control_mapping_section_name,
				ACTION_NAMES[control_index],
				IZ_JOYSTICK_DEFAULT_STATE[player_index].config.control_mapping[control_index],
				config_path
			);
		}

		sprintf_s(main_section_name, 11, "Joystick.%d", player_index);
		(*state)[player_index].config.axis_threshold = ini_getl(main_section_name, "AxisThreshold", IZ_DEFAULT_AXIS_THRESHOLD, config_path);
		(*state)[player_index].config.device_id = ini_getl(main_section_name, "DeviceID", player_index, config_path);
	}
}

IZ_ProcedureResult IZ_JoystickSaveConfig(IZ_JoystickState(* state)[IZ_PLAYERS], const char* config_path) {
	u8 problem = 0;

	char control_mapping_section_name[26];
	char main_section_name[11];

	u8 player_index;
	u8 control_index;
	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
		sprintf_s(control_mapping_section_name, 26, "Joystick.%d.ControlMapping", player_index);
		for (control_index = 4; control_index < CONTROLS; control_index += 1) {
			if (!ini_putl(
				control_mapping_section_name,
				ACTION_NAMES[control_index],
				(*state)[player_index].config.control_mapping[control_index],
				config_path
			)) {
				problem |= (1 << player_index);
			}
		}

		sprintf_s(main_section_name, 11, "Joystick.%d", player_index);
		if (!ini_putl(
			main_section_name,
			"DeviceID",
			(*state)[player_index].config.device_id,
			config_path
		)) {
			problem |= (1 << player_index);
		}

		if (!ini_putl(
			main_section_name,
			"AxisThreshold",
			(*state)[player_index].config.axis_threshold,
			config_path
		)) {
			problem |= (1 << player_index);
		}
	}

	return -problem;
}

IZ_ProcedureResult IZ_JoystickInitialize(IZ_JoystickState(* state)[IZ_PLAYERS], const char* config_path, u8 argc, const char* argv[]) {
	SDL_memcpy(state, &IZ_JOYSTICK_DEFAULT_STATE, sizeof(IZ_JoystickState));

	IZ_JoystickLoadConfig(state, config_path);
	if (IZ_JoystickSaveConfig(state, config_path) < 0) {
		return -1;
	}

	u8 joysticks_count = SDL_NumJoysticks();
	u8 player_index;
	for (player_index = 0; player_index < joysticks_count; player_index += 1) {
		if (player_index >= IZ_PLAYERS) {
			break;
		}
		(*state)[player_index].device = SDL_JoystickOpen(state[player_index]->config.device_id);
	}

	return 0;
}

void IZ_JoystickTeardown(IZ_JoystickState(* state)[IZ_PLAYERS]) {
	u8 player_index;
	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
		if (!(*state)[player_index].device) {
			continue;
		}
		SDL_JoystickClose((*state)[player_index].device);
	}
}