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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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4
src/joystick/darwin/SDL_iokitjoystick.c
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@@ -504,7 +504,7 @@ GetDeviceInfo(IOHIDDeviceRef hidDevice, recDevice *pDevice)
if (vendor && product) {
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_USB);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(SDL_crc16(0, pDevice->product, SDL_strlen(pDevice->product)));
*guid16++ = SDL_SwapLE16((Uint16)vendor);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16((Uint16)product);
@@ -513,7 +513,7 @@ GetDeviceInfo(IOHIDDeviceRef hidDevice, recDevice *pDevice)
*guid16++ = 0;
} else {
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_BLUETOOTH);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(SDL_crc16(0, pDevice->product, SDL_strlen(pDevice->product)));
SDL_strlcpy((char*)guid16, pDevice->product, sizeof(pDevice->guid.data) - 4);
}