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SDL Gamepad Input Stuff
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#include <cstdio> | |
#include <string> | |
#include <vector> | |
#include <SDL.h> | |
void logJoystickEvent(SDL_Event e); | |
std::string showHatState(Uint8 hat); | |
int main(int argc, char* argv[]) { | |
// Detect first gamepad on which a key is pressed, then log its events. | |
bool quit = false; | |
bool deviceFound = false; | |
SDL_Event e; | |
int num_joysticks = 0; | |
SDL_Joystick* activeJoystick = nullptr; | |
SDL_JoystickID activeJoystickID; | |
auto joysticks = std::vector<SDL_Joystick*>(); | |
if (SDL_Init(SDL_INIT_JOYSTICK) < 0) { | |
printf("SDL initialization failed. Error: %s\n", SDL_GetError()); | |
} | |
num_joysticks = SDL_NumJoysticks(); | |
for (int i = 0; i < num_joysticks; i++) { | |
auto joystick = SDL_JoystickOpen(i); | |
if (joystick == nullptr) { | |
printf("Warning: unable to open game controller %d! SDL Error: %s\n", i, SDL_GetError()); | |
} | |
else { | |
joysticks.push_back(joystick); | |
} | |
} | |
while (!deviceFound && !quit) { | |
while (SDL_PollEvent(&e) != 0) { | |
if (e.type == SDL_QUIT) { | |
quit = true; | |
} | |
else if (e.type == SDL_JOYDEVICEADDED) { | |
auto joystick = SDL_JoystickOpen(e.jdevice.which); | |
if (joystick == nullptr) { | |
printf("Warning: unable to open game controller %d! SDL Error: %s\n", e.jdevice.which, SDL_GetError()); | |
} | |
else { | |
joysticks.push_back(joystick); | |
} | |
} | |
else if (e.type == SDL_JOYDEVICEREMOVED) { | |
auto joystick = SDL_JoystickFromInstanceID(e.jdevice.which); | |
SDL_JoystickClose(joystick); | |
} | |
else if (e.type == SDL_JOYBUTTONDOWN) { | |
activeJoystick = SDL_JoystickFromInstanceID(e.jbutton.which); | |
deviceFound = true; | |
logJoystickEvent(e); | |
} | |
} | |
} | |
// Stop listening to all other joysticks; | |
activeJoystickID = SDL_JoystickInstanceID(activeJoystick); | |
auto it = joysticks.begin(); | |
while (it != joysticks.end()) { | |
if (SDL_JoystickInstanceID(*it) != activeJoystickID) { | |
it = joysticks.erase(it); | |
} | |
else { | |
it++; | |
} | |
} | |
while (!quit) { | |
while (SDL_PollEvent(&e) != 0) { | |
if (e.type == SDL_QUIT) { | |
quit = true; | |
} | |
else if (e.type == SDL_JOYBUTTONUP) { | |
logJoystickEvent(e); | |
if (e.jbutton.button == 7) { // start on xbox 360 controller | |
quit = true; | |
} | |
} | |
else if (e.type == SDL_JOYBUTTONDOWN | |
|| e.type == SDL_JOYAXISMOTION | |
|| e.type == SDL_JOYHATMOTION) { | |
logJoystickEvent(e); | |
} | |
else if (e.type == SDL_JOYDEVICEREMOVED) { | |
if (e.jdevice.which == activeJoystickID) { | |
printf("Error: active joystick removed.\n"); | |
quit = true; | |
} | |
} | |
} | |
} | |
SDL_JoystickClose(activeJoystick); | |
SDL_Quit(); | |
return 0; | |
} | |
void logJoystickEvent(SDL_Event e) { | |
Uint32 timestamp = 0; | |
std::string eventType; | |
int index; | |
std::string otherData; | |
switch (e.type) { | |
case SDL_JOYBUTTONUP: | |
timestamp = e.jbutton.timestamp; | |
eventType = "RELEASE"; | |
index = e.jbutton.button; | |
otherData = ""; | |
break; | |
case SDL_JOYBUTTONDOWN: | |
timestamp = e.jbutton.timestamp; | |
eventType = "PRESS"; | |
index = e.jbutton.button; | |
otherData = ""; | |
break; | |
case SDL_JOYHATMOTION: | |
timestamp = e.jhat.timestamp; | |
eventType = "POV"; | |
index = e.jhat.hat; | |
otherData = showHatState(e.jhat.value); | |
break; | |
case SDL_JOYAXISMOTION: | |
timestamp = e.jaxis.timestamp; | |
eventType = "STICK"; | |
index = e.jaxis.axis; | |
otherData = std::to_string(e.jaxis.value); | |
break; | |
} | |
printf("%u\t%s\t%u\t%s\n", timestamp, eventType.c_str(), index, otherData.c_str()); | |
} | |
std::string showHatState(Uint8 hat) { | |
switch (hat) { | |
case SDL_HAT_LEFTUP: | |
return "LU"; | |
break; | |
case SDL_HAT_UP: | |
return "XU"; | |
break; | |
case SDL_HAT_RIGHTUP: | |
return "RU"; | |
break; | |
case SDL_HAT_LEFT: | |
return "LX"; | |
break; | |
case SDL_HAT_CENTERED: | |
return "XX"; | |
break; | |
case SDL_HAT_RIGHT: | |
return "RX"; | |
break; | |
case SDL_HAT_LEFTDOWN: | |
return "LD"; | |
break; | |
case SDL_HAT_DOWN: | |
return "XD"; | |
break; | |
case SDL_HAT_RIGHTDOWN: | |
return "RD"; | |
break; | |
default: | |
return "??"; | |
break; | |
} | |
} |
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