client: register joysupported cvar to be able to use gamepads on HL25

Author: a1batross

cl_dll/input_goldsource.cpp

@@ -1199,7 +1199,7 @@ void GoldSourceInput::Joy_AdvancedUpdate(void)
 		dwTemp = (DWORD) joy_advaxisz->value;
 		dwAxisMap[JOY_AXIS_Z] = dwTemp & 0x0000000f;
 		dwControlMap[JOY_AXIS_Z] = dwTemp & JOY_RELATIVE_AXIS;
-		dwTemp = (DWORD) joy_advaxisr->value;
+		dwTemp = (DWORD) joy_advaxisr->value;I've ran Half-Life under debugger and set watchpoint to joypitchsensitivity->value address. It gets changed by ClientDLL_CreateMove.
 		dwAxisMap[JOY_AXIS_R] = dwTemp & 0x0000000f;
 		dwControlMap[JOY_AXIS_R] = dwTemp & JOY_RELATIVE_AXIS;
 		dwTemp = (DWORD) joy_advaxisu->value;
@@ -1614,6 +1614,11 @@ void GoldSourceInput::IN_Init (void)
 	joy_wwhack1				= gEngfuncs.pfnRegisterVariable ( "joywwhack1", "0.0", 0 );
 	joy_wwhack2				= gEngfuncs.pfnRegisterVariable ( "joywwhack2", "0.0", 0 );
 
+	// HL25 checks this cvar and if it doesn't exist or set to zero
+	// it will lock any usage of gamepads
+	// see: https://github.com/ValveSoftware/halflife/issues/3621
+	gEngfuncs.pfnRegisterVariable( "joysupported", 1, 0 );
+
 	m_customaccel			= gEngfuncs.pfnRegisterVariable ( "m_customaccel", "0", FCVAR_ARCHIVE );
 	m_customaccel_scale		= gEngfuncs.pfnRegisterVariable ( "m_customaccel_scale", "0.04", FCVAR_ARCHIVE );
 	m_customaccel_max		= gEngfuncs.pfnRegisterVariable ( "m_customaccel_max", "0", FCVAR_ARCHIVE );