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Merge pull request #164 from laamaa/refactor/split_input_c
#157 split game controller related functions to a separate file
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,150 @@ | ||
| // | ||
| // Created by jonne on 8/19/24. | ||
| // | ||
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| #include "gamecontrollers.h" | ||
| #include "config.h" | ||
| #include "input.h" | ||
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| #include <SDL.h> | ||
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| static int num_joysticks = 0; | ||
| SDL_GameController *game_controllers[MAX_CONTROLLERS]; | ||
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| // Opens available game controllers and returns the amount of opened controllers | ||
| int gamecontrollers_initialize() { | ||
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| num_joysticks = SDL_NumJoysticks(); | ||
| int controller_index = 0; | ||
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| SDL_Log("Looking for game controllers"); | ||
| SDL_Delay(10); // Some controllers like XBone wired need a little while to get ready | ||
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| // Try to load the game controller database file | ||
| char db_filename[1024] = {0}; | ||
| snprintf(db_filename, sizeof(db_filename), "%sgamecontrollerdb.txt", SDL_GetPrefPath("", "m8c")); | ||
| SDL_Log("Trying to open game controller database from %s", db_filename); | ||
| SDL_RWops *db_rw = SDL_RWFromFile(db_filename, "rb"); | ||
| if (db_rw == NULL) { | ||
| snprintf(db_filename, sizeof(db_filename), "%sgamecontrollerdb.txt", SDL_GetBasePath()); | ||
| SDL_Log("Trying to open game controller database from %s", db_filename); | ||
| db_rw = SDL_RWFromFile(db_filename, "rb"); | ||
| } | ||
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| if (db_rw != NULL) { | ||
| int mappings = SDL_GameControllerAddMappingsFromRW(db_rw, 1); | ||
| if (mappings != -1) | ||
| SDL_Log("Found %d game controller mappings", mappings); | ||
| else | ||
| SDL_LogError(SDL_LOG_CATEGORY_INPUT, "Error loading game controller mappings."); | ||
| } else { | ||
| SDL_LogError(SDL_LOG_CATEGORY_INPUT, "Unable to open game controller database file."); | ||
| } | ||
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| // Open all available game controllers | ||
| for (int i = 0; i < num_joysticks; i++) { | ||
| if (!SDL_IsGameController(i)) | ||
| continue; | ||
| if (controller_index >= MAX_CONTROLLERS) | ||
| break; | ||
| game_controllers[controller_index] = SDL_GameControllerOpen(i); | ||
| SDL_Log("Controller %d: %s", controller_index + 1, | ||
| SDL_GameControllerName(game_controllers[controller_index])); | ||
| controller_index++; | ||
| } | ||
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| return controller_index; | ||
| } | ||
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| // Closes all open game controllers | ||
| void gamecontrollers_close() { | ||
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| for (int i = 0; i < MAX_CONTROLLERS; i++) { | ||
| if (game_controllers[i]) | ||
| SDL_GameControllerClose(game_controllers[i]); | ||
| } | ||
| } | ||
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| // Check whether a button is pressed on a gamepad and return 1 if pressed. | ||
| static int get_game_controller_button(config_params_s *conf, SDL_GameController *controller, | ||
| int button) { | ||
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| const int button_mappings[8] = {conf->gamepad_up, conf->gamepad_down, conf->gamepad_left, | ||
| conf->gamepad_right, conf->gamepad_opt, conf->gamepad_edit, | ||
| conf->gamepad_select, conf->gamepad_start}; | ||
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| // Check digital buttons | ||
| if (SDL_GameControllerGetButton(controller, button_mappings[button])) { | ||
| return 1; | ||
| } | ||
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| // If digital button isn't pressed, check the corresponding analog control | ||
| switch (button) { | ||
| case INPUT_UP: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_updown) < | ||
| -conf->gamepad_analog_threshold; | ||
| case INPUT_DOWN: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_updown) > | ||
| conf->gamepad_analog_threshold; | ||
| case INPUT_LEFT: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_leftright) < | ||
| -conf->gamepad_analog_threshold; | ||
| case INPUT_RIGHT: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_leftright) > | ||
| conf->gamepad_analog_threshold; | ||
| case INPUT_OPT: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_opt) > | ||
| conf->gamepad_analog_threshold; | ||
| case INPUT_EDIT: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_edit) > | ||
| conf->gamepad_analog_threshold; | ||
| case INPUT_SELECT: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_select) > | ||
| conf->gamepad_analog_threshold; | ||
| case INPUT_START: | ||
| return SDL_GameControllerGetAxis(controller, conf->gamepad_analog_axis_start) > | ||
| conf->gamepad_analog_threshold; | ||
| default: | ||
| return 0; | ||
| } | ||
| } | ||
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| // Handle game controllers, simply check all buttons and analog axis on every | ||
| // cycle | ||
| int gamecontrollers_handle_buttons(config_params_s *conf) { | ||
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| const int keycodes[8] = {key_up, key_down, key_left, key_right, | ||
| key_opt, key_edit, key_select, key_start}; | ||
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| int key = 0; | ||
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| // Cycle through every active game controller | ||
| for (int gc = 0; gc < num_joysticks; gc++) { | ||
| // Cycle through all M8 buttons | ||
| for (int button = 0; button < INPUT_MAX; button++) { | ||
| // If the button is active, add the keycode to the variable containing | ||
| // active keys | ||
| if (get_game_controller_button(conf, game_controllers[gc], button)) { | ||
| key |= keycodes[button]; | ||
| } | ||
| } | ||
| } | ||
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| return key; | ||
| } | ||
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| input_msg_s gamecontrollers_handle_special_messages(config_params_s *conf) { | ||
| input_msg_s msg = {0}; | ||
| // Read special case game controller buttons quit and reset | ||
| for (int gc = 0; gc < num_joysticks; gc++) { | ||
| if (SDL_GameControllerGetButton(game_controllers[gc], conf->gamepad_quit) && | ||
| (SDL_GameControllerGetButton(game_controllers[gc], conf->gamepad_select) || | ||
| SDL_GameControllerGetAxis(game_controllers[gc], conf->gamepad_analog_axis_select))) | ||
| msg = (input_msg_s){special, msg_quit}; | ||
| else if (SDL_GameControllerGetButton(game_controllers[gc], conf->gamepad_reset) && | ||
| (SDL_GameControllerGetButton(game_controllers[gc], conf->gamepad_select) || | ||
| SDL_GameControllerGetAxis(game_controllers[gc], conf->gamepad_analog_axis_select))) | ||
| msg = (input_msg_s){special, msg_reset_display}; | ||
| } | ||
| return msg; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| // | ||
| // Created by jonne on 8/19/24. | ||
| // | ||
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| #ifndef GAMECONTROLLERS_H_ | ||
| #define GAMECONTROLLERS_H_ | ||
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| #include "config.h" | ||
| #include "input.h" | ||
| #include <SDL_gamecontroller.h> | ||
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| #define MAX_CONTROLLERS 4 | ||
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| int gamecontrollers_initialize(); | ||
| void gamecontrollers_close(); | ||
| int gamecontrollers_handle_buttons(config_params_s *conf); | ||
| input_msg_s gamecontrollers_handle_special_messages(config_params_s *conf); | ||
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| #endif //GAMECONTROLLERS_H_ |
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