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Added game controller support for virtual joysticks

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Fixes https://github.com/libsdl-org/SDL/issues/5662
This commit is contained in:
Sam Lantinga
2022-05-15 09:35:52 -07:00
parent 996b3dc37a
commit 7ad15c5b8f
3 changed files with 168 additions and 1 deletions
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97
src/joystick/SDL_gamecontroller.c
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@@ -464,6 +464,100 @@ static int SDLCALL SDL_GameControllerEventWatcher(void *userdata, SDL_Event * ev
return 1;
}
/*
* Helper function to guess at a mapping for virtual controllers
*/
static ControllerMapping_t *SDL_CreateMappingForVirtualController(SDL_JoystickGUID guid)
{
const int face_button_mask = ((1 << SDL_CONTROLLER_BUTTON_A) |
(1 << SDL_CONTROLLER_BUTTON_B) |
(1 << SDL_CONTROLLER_BUTTON_X) |
(1 << SDL_CONTROLLER_BUTTON_Y));
SDL_bool existing;
char mapping_string[1024];
int button_mask;
int axis_mask;
button_mask = SDL_SwapLE16(*(Uint16*)(&guid.data[sizeof(guid.data)-4]));
axis_mask = SDL_SwapLE16(*(Uint16*)(&guid.data[sizeof(guid.data)-2]));
if (!button_mask && !axis_mask) {
return NULL;
}
if (!(button_mask & face_button_mask)) {
/* We don't know what buttons or axes are supported, don't make up a mapping */
return NULL;
}
SDL_strlcpy(mapping_string, "none,*,", sizeof(mapping_string));
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_A)) {
SDL_strlcat(mapping_string, "a:b0,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_B)) {
SDL_strlcat(mapping_string, "b:b1,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_X)) {
SDL_strlcat(mapping_string, "x:b2,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_Y)) {
SDL_strlcat(mapping_string, "y:b3,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_BACK)) {
SDL_strlcat(mapping_string, "back:b4,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_GUIDE)) {
SDL_strlcat(mapping_string, "guide:b5,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_START)) {
SDL_strlcat(mapping_string, "start:b6,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_LEFTSTICK)) {
SDL_strlcat(mapping_string, "leftstick:b7,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_RIGHTSTICK)) {
SDL_strlcat(mapping_string, "rightstick:b8,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_LEFTSHOULDER)) {
SDL_strlcat(mapping_string, "leftshoulder:b9,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_RIGHTSHOULDER)) {
SDL_strlcat(mapping_string, "rightshoulder:b10,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_UP)) {
SDL_strlcat(mapping_string, "dpup:b11,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_DOWN)) {
SDL_strlcat(mapping_string, "dpdown:b12,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_LEFT)) {
SDL_strlcat(mapping_string, "dpleft:b13,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_RIGHT)) {
SDL_strlcat(mapping_string, "dpright:b14,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_LEFTX)) {
SDL_strlcat(mapping_string, "leftx:a0,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_LEFTY)) {
SDL_strlcat(mapping_string, "lefty:a1,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_RIGHTX)) {
SDL_strlcat(mapping_string, "rightx:a2,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_RIGHTY)) {
SDL_strlcat(mapping_string, "righty:a3,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_TRIGGERLEFT)) {
SDL_strlcat(mapping_string, "lefttrigger:a4,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_TRIGGERRIGHT)) {
SDL_strlcat(mapping_string, "righttrigger:a5,", sizeof(mapping_string));
}
return SDL_PrivateAddMappingForGUID(guid, mapping_string,
&existing, SDL_CONTROLLER_MAPPING_PRIORITY_DEFAULT);
}
#ifdef __ANDROID__
/*
* Helper function to guess at a mapping based on the elements reported for this controller
@@ -696,6 +790,9 @@ static ControllerMapping_t *SDL_PrivateGetControllerMappingForGUID(SDL_JoystickG
return s_pXInputMapping;
}
#endif
if (!mapping && SDL_IsJoystickVirtual(guid)) {
mapping = SDL_CreateMappingForVirtualController(guid);
}
#ifdef __ANDROID__
if (!mapping && !SDL_IsJoystickHIDAPI(guid)) {
mapping = SDL_CreateMappingForAndroidController(guid);