extend rawkb hint with nohotkey & appkey options

Author: expikr

include/SDL3/SDL_hints.h

@@ -4115,12 +4115,14 @@ extern "C" {
 #define SDL_HINT_WINDOWS_GAMEINPUT   "SDL_WINDOWS_GAMEINPUT"
 
 /**
- * A variable controlling whether raw keyboard events are used on Windows.
+ * A variable controlling if and how raw keyboard events are used on Windows.
  *
  * The variable can be set to the following values:
  *
- * - "0": The Windows message loop is used for keyboard events. (default)
- * - "1": Low latency raw keyboard events are used.
+ * - "0": Raw keyboard events are not used (default)
+ * - "1": Raw keyboard events are used.
+ * - "2": Raw keyboard events are used, with RIDEV_NOHOTKEYS. (available since SDL 3.4.0)
+ * - "2": Raw keyboard events are used, with RIDEV_NOHOTKEYS and RIDEV_APPKEYS. (available since SDL 3.4.0)
  *
  * This hint can be set anytime.
  *

src/video/windows/SDL_windowsrawinput.c

@@ -78,6 +78,13 @@ static DWORD WINAPI WIN_RawInputThread(LPVOID param)
         devices[count].usUsagePage = USB_USAGEPAGE_GENERIC_DESKTOP;
         devices[count].usUsage = USB_USAGE_GENERIC_KEYBOARD;
         devices[count].dwFlags = 0;
+        int rawmode = 3 & SDL_atoi(SDL_GetHint(SDL_HINT_WINDOWS_RAW_KEYBOARD));
+        if (rawmode > 1) {
+            devices[count].dwFlags |= RIDEV_NOHOTKEYS;
+            if (rawmode == 3) {
+                devices[count].dwFlags |= RIDEV_APPKEYS;
+            }
+        }
         devices[count].hwndTarget = window;
         ++count;
     }