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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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40
src/joystick/windows/SDL_rawinputjoystick.c
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@@ -755,26 +755,6 @@ RAWINPUT_AddDevice(HANDLE hDevice)
CHECK(device->preparsed_data = (PHIDP_PREPARSED_DATA)SDL_calloc(size, sizeof(BYTE)));
CHECK(GetRawInputDeviceInfoA(hDevice, RIDI_PREPARSEDDATA, device->preparsed_data, &size) != (UINT)-1);
{
const Uint16 vendor = device->vendor_id;
const Uint16 product = device->product_id;
const Uint16 version = device->version;
Uint16 *guid16 = (Uint16 *)device->guid.data;
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_USB);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(vendor);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(product);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(version);
*guid16++ = 0;
/* Note that this is a RAWINPUT device for special handling elsewhere */
device->guid.data[14] = 'r';
device->guid.data[15] = 0;
}
hFile = CreateFileA(dev_name, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
CHECK(hFile != INVALID_HANDLE_VALUE);
@@ -799,6 +779,26 @@ RAWINPUT_AddDevice(HANDLE hDevice)
SDL_free(product_string);
}
}
{
const Uint16 vendor = device->vendor_id;
const Uint16 product = device->product_id;
const Uint16 version = device->version;
Uint16 *guid16 = (Uint16 *)device->guid.data;
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_USB);
*guid16++ = SDL_SwapLE16(SDL_crc16(0, device->name, SDL_strlen(device->name)));
*guid16++ = SDL_SwapLE16(vendor);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(product);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(version);
*guid16++ = 0;
/* Note that this is a RAWINPUT device for special handling elsewhere */
device->guid.data[14] = 'r';
device->guid.data[15] = 0;
}
device->path = SDL_strdup(dev_name);
CloseHandle(hFile);