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Add --debug flag for diagnosing controller input on handheld

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Logs joystick enumeration at startup (name, GameController status, GUID)
and all SDL input events in the main loop to help diagnose why the retro
handheld's d-pad/buttons aren't recognized by the GameController API.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Michael Smith
2026-02-11 16:08:13 +01:00
parent 141dbd97e0
commit e3a2bca794
2 changed files with 104 additions and 6 deletions
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97
src/sdlamp2.c
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@@ -65,6 +65,7 @@ static int current_file_index = 0;
static float volume = 0.5f;
static int focus_index = FOCUS_PLAY;
static SDL_GameController* controller = NULL;
static int debug_mode = 0;
/* --- Utility --- */
@@ -533,8 +534,18 @@ static void activate_focused_button(void) {
/* --- Main --- */
int main(int argc, char** argv) {
if (argc > 1) {
strncpy(audio_dir, argv[1], sizeof(audio_dir) - 1);
/* Parse arguments: [--debug] [audio_directory] */
int argi = 1;
while (argi < argc && argv[argi][0] == '-') {
if (strcmp(argv[argi], "--debug") == 0) {
debug_mode = 1;
} else {
fprintf(stderr, "Unknown option: %s\n", argv[argi]);
}
argi++;
}
if (argi < argc) {
strncpy(audio_dir, argv[argi], sizeof(audio_dir) - 1);
audio_dir[sizeof(audio_dir) - 1] = '\0';
}
@@ -590,8 +601,21 @@ int main(int argc, char** argv) {
panic_and_abort("Could not open audio device!", SDL_GetError());
}
/* Open first available game controller */
for (int i = 0; i < SDL_NumJoysticks(); i++) {
/* Enumerate and open game controllers */
int num_joy = SDL_NumJoysticks();
if (debug_mode) {
printf("[debug] Joysticks detected: %d\n", num_joy);
for (int i = 0; i < num_joy; i++) {
SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(i);
char guid_str[64];
SDL_JoystickGetGUIDString(guid, guid_str, sizeof(guid_str));
printf("[debug] #%d: \"%s\" | GameController=%s | GUID=%s\n", i,
SDL_JoystickNameForIndex(i), SDL_IsGameController(i) ? "yes" : "no", guid_str);
}
fflush(stdout);
}
for (int i = 0; i < num_joy; i++) {
if (SDL_IsGameController(i)) {
controller = SDL_GameControllerOpen(i);
if (controller) {
@@ -627,6 +651,64 @@ int main(int argc, char** argv) {
while (running) {
/* --- Event handling --- */
while (SDL_PollEvent(&e)) {
/* Debug: log all input-related events */
if (debug_mode) {
switch (e.type) {
case SDL_KEYDOWN:
printf("[debug] KEYDOWN: sym=%s (0x%x) scancode=%d\n",
SDL_GetKeyName(e.key.keysym.sym), e.key.keysym.sym, e.key.keysym.scancode);
break;
case SDL_KEYUP:
printf("[debug] KEYUP: sym=%s (0x%x) scancode=%d\n",
SDL_GetKeyName(e.key.keysym.sym), e.key.keysym.sym, e.key.keysym.scancode);
break;
case SDL_CONTROLLERBUTTONDOWN:
printf("[debug] CONTROLLERBUTTONDOWN: button=%d (%s)\n", e.cbutton.button,
SDL_GameControllerGetStringForButton(e.cbutton.button));
break;
case SDL_CONTROLLERBUTTONUP:
printf("[debug] CONTROLLERBUTTONUP: button=%d (%s)\n", e.cbutton.button,
SDL_GameControllerGetStringForButton(e.cbutton.button));
break;
case SDL_JOYBUTTONDOWN:
printf("[debug] JOYBUTTONDOWN: joy=%d button=%d\n", e.jbutton.which,
e.jbutton.button);
break;
case SDL_JOYBUTTONUP:
printf("[debug] JOYBUTTONUP: joy=%d button=%d\n", e.jbutton.which, e.jbutton.button);
break;
case SDL_JOYHATMOTION:
printf("[debug] JOYHATMOTION: joy=%d hat=%d value=%d\n", e.jhat.which, e.jhat.hat,
e.jhat.value);
break;
case SDL_JOYAXISMOTION:
if (e.jaxis.value > 8000 || e.jaxis.value < -8000) {
printf("[debug] JOYAXISMOTION: joy=%d axis=%d value=%d\n", e.jaxis.which,
e.jaxis.axis, e.jaxis.value);
}
break;
case SDL_CONTROLLERDEVICEADDED: {
SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(e.cdevice.which);
char guid_str[64];
SDL_JoystickGetGUIDString(guid, guid_str, sizeof(guid_str));
printf("[debug] CONTROLLERDEVICEADDED: index=%d name=\"%s\" GUID=%s\n", e.cdevice.which,
SDL_JoystickNameForIndex(e.cdevice.which), guid_str);
break;
}
case SDL_CONTROLLERDEVICEREMOVED:
printf("[debug] CONTROLLERDEVICEREMOVED: id=%d\n", e.cdevice.which);
break;
case SDL_JOYDEVICEADDED:
printf("[debug] JOYDEVICEADDED: index=%d name=\"%s\"\n", e.jdevice.which,
SDL_JoystickNameForIndex(e.jdevice.which));
break;
case SDL_JOYDEVICEREMOVED:
printf("[debug] JOYDEVICEREMOVED: id=%d\n", e.jdevice.which);
break;
}
fflush(stdout);
}
switch (e.type) {
case SDL_QUIT:
running = SDL_FALSE;
@@ -677,7 +759,12 @@ int main(int argc, char** argv) {
if (!controller && SDL_IsGameController(e.cdevice.which)) {
controller = SDL_GameControllerOpen(e.cdevice.which);
if (controller) {
printf("Controller added: %s\n", SDL_GameControllerName(controller));
SDL_Joystick* joy = SDL_GameControllerGetJoystick(controller);
SDL_JoystickGUID guid = SDL_JoystickGetGUID(joy);
char guid_str[64];
SDL_JoystickGetGUIDString(guid, guid_str, sizeof(guid_str));
printf("Controller added: %s (GUID: %s)\n", SDL_GameControllerName(controller),
guid_str);
}
}
break;