Add support for Oklick W-2 racing wheel controller

This PR adds the proper mapping for this racing wheel controller to comply with XInput documentation (mostly to treat the pedals as the trigger axes).

src/joystick/SDL_gamepad.c

@@ -1087,7 +1087,7 @@ static GamepadMapping_t *SDL_CreateMappingForHIDAPIGamepad(SDL_GUID guid)
 
     SDL_GetJoystickGUIDInfo(guid, &vendor, &product, &version, NULL);
 
-    if (SDL_IsJoystickWheel(vendor, product)) {
+    if (SDL_IsJoystickWheel(vendor, product, 0)) {
         // We don't want to pick up Logitech FFB wheels here
         // Some versions of WINE will also not treat devices that show up as gamepads as wheels
         return NULL;

src/joystick/SDL_gamepad_db.h

@@ -212,6 +212,7 @@ static const char *s_GamepadMappings[] = {
     "03000000bd12000015d0000000000000,Nintendo Retrolink USB Super SNES Classic Controller,a:b2,b:b1,back:b8,leftshoulder:b4,leftx:a0,lefty:a1,rightshoulder:b5,start:b9,x:b3,y:b0,",
     "030000007e0500000920000000000000,Nintendo Switch Pro Controller,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b2,y:b3,hint:!SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
     "030000000d0500000308000000000000,Nostromo N45,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b9,leftshoulder:b4,leftstick:b12,lefttrigger:b5,leftx:a0,lefty:a1,rightshoulder:b6,rightstick:b11,righttrigger:b7,rightx:a3,righty:a2,start:b10,x:b2,y:b3,",
+    "03000000ff1100003133000000000000,Oklick W-2,crc:faf6,a:b2,b:b3,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b10,lefttrigger:+a1,leftx:a0,rightshoulder:b5,rightstick:b11,righttrigger:-a1,start:b9,x:b0,y:b1,",
     "03000000d62000006d57000000000000,OPP PS3 Controller,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b0,y:b3,",
     "03000000362800000100000000000000,OUYA Game Controller,a:b0,b:b3,dpdown:b9,dpleft:b10,dpright:b11,dpup:b8,guide:b14,leftshoulder:b4,leftstick:b6,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b7,righttrigger:b13,rightx:a3,righty:a4,x:b1,y:b2,",
     "03000000782300000a10000000000000,Onlive Wireless Controller,a:b15,b:b14,back:b7,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,leftshoulder:b11,leftstick:b9,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a3,righty:a4,start:b6,x:b13,y:b12,",

src/joystick/SDL_joystick.c

@@ -3425,8 +3425,12 @@ bool SDL_IsJoystickVIRTUAL(SDL_GUID guid)
     return (guid.data[14] == 'v') ? true : false;
 }
 
-bool SDL_IsJoystickWheel(Uint16 vendor_id, Uint16 product_id)
+bool SDL_IsJoystickWheel(Uint16 vendor_id, Uint16 product_id, Uint16 crc)
 {
+    if (vendor_id == 0x11FF && product_id == 0x3331 && crc == 0xFAF6) {
+        // Oklick W-2 racing wheel controller (on Windows via DirectInput).
+        return true;
+    }
     return SDL_VIDPIDInList(vendor_id, product_id, &wheel_devices);
 }
 
@@ -3459,10 +3463,11 @@ static SDL_JoystickType SDL_GetJoystickGUIDType(SDL_GUID guid)
 {
     Uint16 vendor;
     Uint16 product;
+    Uint16 crc;
 
-    SDL_GetJoystickGUIDInfo(guid, &vendor, &product, NULL, NULL);
+    SDL_GetJoystickGUIDInfo(guid, &vendor, &product, NULL, &crc);
 
-    if (SDL_IsJoystickWheel(vendor, product)) {
+    if (SDL_IsJoystickWheel(vendor, product, crc)) {
         return SDL_JOYSTICK_TYPE_WHEEL;
     }
 

src/joystick/SDL_joystick_c.h

@@ -172,7 +172,7 @@ extern bool SDL_IsJoystickRAWINPUT(SDL_GUID guid);
 extern bool SDL_IsJoystickVIRTUAL(SDL_GUID guid);
 
 // Function to return whether a joystick is a wheel
-extern bool SDL_IsJoystickWheel(Uint16 vendor_id, Uint16 product_id);
+extern bool SDL_IsJoystickWheel(Uint16 vendor_id, Uint16 product_id, Uint16 crc);
 
 // Function to return whether a joystick should be ignored
 extern bool SDL_ShouldIgnoreJoystick(Uint16 vendor_id, Uint16 product_id, Uint16 version, const char *name);