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Added the CRC of the joystick name to the GUID

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This will make it possible to have mappings for different controllers
that have the same VID/PID. This happens frequently with some generic
controller boards that have been reused in many products.

Fixes https://github.com/libsdl-org/SDL/issues/6004
This commit is contained in:
Sam Lantinga
2022-08-22 16:46:55 -07:00
parent 20715fa014
commit c1e0873940
21 changed files with 179 additions and 117 deletions
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10
src/joystick/emscripten/SDL_sysjoystick.c
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@@ -394,11 +394,15 @@ EMSCRIPTEN_JoystickClose(SDL_Joystick *joystick)
static SDL_JoystickGUID
EMSCRIPTEN_JoystickGetDeviceGUID(int device_index)
{
SDL_JoystickGUID guid;
/* the GUID is just the first 16 chars of the name for now */
/* the GUID is just the name for now */
const char *name = EMSCRIPTEN_JoystickGetDeviceName(device_index);
SDL_JoystickGUID guid;
Uint16 *guid16 = (Uint16 *)guid.data;
SDL_zero(guid);
SDL_memcpy(&guid, name, SDL_min(sizeof(guid), SDL_strlen(name)));
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_UNKNOWN);
*guid16++ = SDL_SwapLE16(SDL_crc16(0, name, SDL_strlen(name)));
SDL_strlcpy((char*)guid16, name, sizeof(guid.data) - 4);
return guid;
}