diff --git a/Descent3/sdlmain.cpp b/Descent3/sdlmain.cpp
index 92974f5d1..4813bface 100644
--- a/Descent3/sdlmain.cpp
+++ b/Descent3/sdlmain.cpp
@@ -176,37 +176,6 @@ class oeD3LnxDatabase final : public oeLnxAppDatabase {
   }
 };
 
-bool sdlKeyFilter(const SDL_Event *event);
-bool sdlMouseButtonUpFilter(const SDL_Event *event);
-bool sdlMouseButtonDownFilter(const SDL_Event *event);
-bool sdlMouseWheelFilter(const SDL_Event *event);
-bool sdlMouseMotionFilter(const SDL_Event *event);
-
-bool SDLCALL d3SDLEventFilter(void *userdata, SDL_Event *event) {
-  switch (event->type) {
-  case SDL_EVENT_KEY_UP:
-  case SDL_EVENT_KEY_DOWN:
-    return (sdlKeyFilter(event));
-  case SDL_EVENT_JOYSTICK_BALL_MOTION:
-  case SDL_EVENT_MOUSE_MOTION:
-    return (sdlMouseMotionFilter(event));
-  case SDL_EVENT_MOUSE_BUTTON_UP:
-    return (sdlMouseButtonUpFilter(event));
-  case SDL_EVENT_MOUSE_BUTTON_DOWN:
-    return (sdlMouseButtonDownFilter(event));
-  case SDL_EVENT_MOUSE_WHEEL:
-    return (sdlMouseWheelFilter(event));
-  case SDL_EVENT_QUIT:
-    SDL_Quit();
-    _exit(0);
-    break;
-  default:
-    break;
-  } // switch
-
-  return (1);
-}
-
 //	---------------------------------------------------------------------------
 //	Main
 //		creates all the OS objects and then runs Descent 3.
@@ -250,8 +219,6 @@ int main(int argc, char *argv[]) {
     return (0);
   }
 
-  // !!! FIXME: Don't use an event filter!
-  SDL_SetEventFilter(d3SDLEventFilter, nullptr);
   install_signal_handlers();
 
   // Initialize our OS Object.  This could be a game dependant OS object, or a default OS object.
diff --git a/ddio/ddio.cpp b/ddio/ddio.cpp
index 78b3d3d96..9a061e71a 100644
--- a/ddio/ddio.cpp
+++ b/ddio/ddio.cpp
@@ -90,7 +90,10 @@
 
 #include <cstdlib>
 
+#include <SDL3/SDL.h>
+
 #include "ddio.h"
+#include "ddio_lnx.h"
 #include "joystick.h"
 #include "log.h"
 #include "pserror.h"
@@ -140,9 +143,46 @@ void ddio_Resume() {
   ddio_InternalKeyResume();
   ddio_InternalMouseResume();
 }
+
 // handles buffered input from devices once per frame.
+void sdlKeyEvent(const SDL_Event *event);
+void sdlMouseButtonUpEvent(const SDL_Event *event);
+void sdlMouseButtonDownEvent(const SDL_Event *event);
+void sdlMouseWheelEvent(const SDL_Event *event);
+void sdlMouseMotionEvent(const SDL_Event *event);
 void ddio_Frame() {
+  if (Input_mode == Input_sdl) {
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+      switch (event.type) {
+      case SDL_EVENT_KEY_UP:
+      case SDL_EVENT_KEY_DOWN:
+        sdlKeyEvent(&event);
+        break;
+      case SDL_EVENT_JOYSTICK_BALL_MOTION:
+      case SDL_EVENT_MOUSE_MOTION:
+        sdlMouseMotionEvent(&event);
+        break;
+      case SDL_EVENT_MOUSE_BUTTON_UP:
+        sdlMouseButtonUpEvent(&event);
+        break;
+      case SDL_EVENT_MOUSE_BUTTON_DOWN:
+        sdlMouseButtonDownEvent(&event);
+        break;
+      case SDL_EVENT_MOUSE_WHEEL:
+        sdlMouseWheelEvent(&event);
+        break;
+      case SDL_EVENT_QUIT:
+        SDL_Quit();
+        _exit(0);
+        break;
+      default:
+        break;
+      }
+    }
+  }
+  
   ddio_InternalKeyFrame();
   ddio_InternalMouseFrame();
   ddio_InternalJoyFrame();
-}
\ No newline at end of file
+}
diff --git a/ddio/ddio_lnx.h b/ddio/ddio_lnx.h
index 8e96b1d80..ca22e679e 100644
--- a/ddio/ddio_lnx.h
+++ b/ddio/ddio_lnx.h
@@ -28,4 +28,10 @@
 
 extern oeLnxApplication *Lnx_app_obj;
 
+enum input_mode_t {
+  Input_null,
+  Input_sdl,
+};
+extern enum input_mode_t Input_mode;
+
 #endif
diff --git a/ddio/lnxio.cpp b/ddio/lnxio.cpp
index c96173b2b..d8b410b7f 100644
--- a/ddio/lnxio.cpp
+++ b/ddio/lnxio.cpp
@@ -69,9 +69,11 @@
 #include "application.h"
 #include "ddio.h"
 #include "log.h"
+#include "ddio_lnx.h"
 
 bool DDIO_init = false;
 oeLnxApplication *Lnx_app_obj = NULL;
+enum input_mode_t Input_mode;
 
 // ----------------------------------------------------------------------------
 //	Initialization and destruction functions
@@ -80,6 +82,17 @@ oeLnxApplication *Lnx_app_obj = NULL;
 bool ddio_InternalInit(ddio_init_info *init_info) {
   LOG_DEBUG << "DDIO: ddio_InternalInit() called.";
   Lnx_app_obj = (oeLnxApplication *)init_info->obj;
+
+  if (!Lnx_app_obj) {
+    return false;
+  }
+
+  tLnxAppInfo app_info;
+  Lnx_app_obj->get_info(&app_info);
+
+  // determine if we are to use SDL or null mode
+  Input_mode = (app_info.flags & APPFLAG_USESERVICE) ? Input_null : Input_sdl;
+
   DDIO_init = true;
   return true;
 }
diff --git a/ddio/lnxkey.cpp b/ddio/lnxkey.cpp
index c6abbe368..f4f23cb4a 100644
--- a/ddio/lnxkey.cpp
+++ b/ddio/lnxkey.cpp
@@ -52,6 +52,7 @@
 #include "application.h"
 #include "ddio.h"
 #include "mono.h"
+#include "ddio_lnx.h"
 
 volatile struct tLnxKeys {
   union {
@@ -87,29 +88,12 @@ void ddio_sdl_InternalResetKey(uint8_t key);
 bool ddio_sdl_KeyFrame();
 void ddio_sdl_InternalKeyFrame(void);
 
-enum {
-  Input_null,
-  Input_sdl // Input_svga,Input_xwin
-} Keyboard_mode;
-
 // ----------------------------------------------------------------------------
 //	Initialization of keyboard device.
 // ----------------------------------------------------------------------------
 
 bool ddio_InternalKeyInit(ddio_init_info *init_info) {
-  oeLnxApplication *app = (oeLnxApplication *)init_info->obj;
-  tLnxAppInfo app_info;
-
-  if (!app) {
-    return false;
-  }
-
-  app->get_info(&app_info);
-
-  // determine if we are to use SDL or null mode
-  Keyboard_mode = (app_info.flags & APPFLAG_USESERVICE) ? Input_null : Input_sdl;
-
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     return ddio_null_InternalKeyInit(init_info);
   case Input_sdl:
@@ -120,7 +104,7 @@ bool ddio_InternalKeyInit(ddio_init_info *init_info) {
 }
 
 void ddio_InternalKeyClose() {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     return ddio_null_InternalKeyClose();
   case Input_sdl:
@@ -129,7 +113,7 @@ void ddio_InternalKeyClose() {
 }
 
 bool ddio_InternalKeyState(uint8_t key) {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     return ddio_null_InternalKeyState(key);
   case Input_sdl:
@@ -140,7 +124,7 @@ bool ddio_InternalKeyState(uint8_t key) {
 }
 
 void ddio_InternalKeySuspend() {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     ddio_null_InternalKeySuspend();
     break;
@@ -150,7 +134,7 @@ void ddio_InternalKeySuspend() {
 }
 
 void ddio_InternalKeyResume() {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     ddio_null_InternalKeyResume();
     break;
@@ -160,7 +144,7 @@ void ddio_InternalKeyResume() {
 }
 
 float ddio_InternalKeyDownTime(uint8_t key) {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     return ddio_null_InternalKeyDownTime(key);
   case Input_sdl:
@@ -171,7 +155,7 @@ float ddio_InternalKeyDownTime(uint8_t key) {
 }
 
 void ddio_InternalResetKey(uint8_t key) {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     ddio_null_InternalResetKey(key);
     break;
@@ -181,7 +165,7 @@ void ddio_InternalResetKey(uint8_t key) {
 }
 
 bool ddio_KeyFrame() {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_sdl:
     break;
   case Input_null:
@@ -192,7 +176,7 @@ bool ddio_KeyFrame() {
 }
 
 void ddio_InternalKeyFrame(void) {
-  switch (Keyboard_mode) {
+  switch (Input_mode) {
   case Input_null:
     ddio_null_InternalKeyFrame();
     break;
diff --git a/ddio/lnxkey_sdl.cpp b/ddio/lnxkey_sdl.cpp
index c8888747f..fe8db2ad4 100644
--- a/ddio/lnxkey_sdl.cpp
+++ b/ddio/lnxkey_sdl.cpp
@@ -340,15 +340,15 @@ static inline uint8_t sdlkeycode_to_keycode(uint32_t sdlkeycode) {
   return (uint8_t)rc;
 }
 
-bool sdlKeyFilter(const SDL_Event *event) {
+void sdlKeyEvent(const SDL_Event *event) {
   uint8_t kc = 0;
 
   if ((event->type != SDL_EVENT_KEY_UP) && (event->type != SDL_EVENT_KEY_DOWN))
-    return true;
+    return;
 
   if (event->key.down) {
     if (event->key.repeat) {
-      return false; // ignore these, we only want to know if it's a first time pressed, not a key-repeat.
+      return; // ignore these, we only want to know if it's a first time pressed, not a key-repeat.
     }
     kc = sdlkeycode_to_keycode(event->key.key);
     if (event->key.mod & SDL_KMOD_CTRL) {
@@ -358,7 +358,7 @@ bool sdlKeyFilter(const SDL_Event *event) {
         bool grab = !ddio_MouseGetGrab();
         ddio_MouseSetGrab(grab);
         SDL_SetWindowRelativeMouseMode(GSDLWindow, grab);
-        return false;
+        return;
       } // switch
     }   // if
 
@@ -366,7 +366,7 @@ bool sdlKeyFilter(const SDL_Event *event) {
       if ((kc == KEY_ENTER) || (kc == KEY_PADENTER)) {
         Game_fullscreen = !Game_fullscreen;
         rend_SetFullScreen(Game_fullscreen);
-        return false;
+        return;
       } // if
     }   // else if
 
@@ -382,9 +382,7 @@ bool sdlKeyFilter(const SDL_Event *event) {
       ddio_UpdateKeyState(kc, false);
     } // if
   }
-
-  return false;
-} // sdlKeyFilter
+}
 
 bool ddio_sdl_InternalKeyInit(ddio_init_info *init_info) {
   // reset key list
diff --git a/ddio/lnxmouse.cpp b/ddio/lnxmouse.cpp
index 12c0121db..649427f00 100644
--- a/ddio/lnxmouse.cpp
+++ b/ddio/lnxmouse.cpp
@@ -190,7 +190,7 @@ void ddio_MouseMode(int mode) { Mouse_mode = mode; }
 // virtual coordinate system for mouse (match to video resolution set for optimal mouse usage.
 void ddio_MouseSetVCoords(int width, int height) { ddio_MouseSetLimits(0, 0, width, height); }
 
-bool sdlMouseButtonDownFilter(SDL_Event const *event) {
+void sdlMouseButtonDownEvent(SDL_Event const *event) {
   ASSERT(event->type == SDL_EVENT_MOUSE_BUTTON_DOWN);
 
   const SDL_MouseButtonEvent *ev = &event->button;
@@ -258,11 +258,9 @@ bool sdlMouseButtonDownFilter(SDL_Event const *event) {
     MB_queue.send(mevt);
     //		mprintf(0, "MOUSE Button 7: Down\n");
   }
-
-  return false;
 }
 
-bool sdlMouseButtonUpFilter(SDL_Event const *event) {
+void sdlMouseButtonUpEvent(SDL_Event const *event) {
   ASSERT(event->type == SDL_EVENT_MOUSE_BUTTON_UP);
 
   const SDL_MouseButtonEvent *ev = &event->button;
@@ -332,11 +330,9 @@ bool sdlMouseButtonUpFilter(SDL_Event const *event) {
     MB_queue.send(mevt);
     //		mprintf(0, "MOUSE Button 7: Up\n");
   }
-
-  return false;
 }
 
-bool sdlMouseWheelFilter(SDL_Event const *event) {
+void sdlMouseWheelEvent(SDL_Event const *event) {
   ASSERT(event->type == SDL_EVENT_MOUSE_WHEEL);
 
   const SDL_MouseWheelEvent *ev = &event->wheel;
@@ -383,11 +379,9 @@ bool sdlMouseWheelFilter(SDL_Event const *event) {
     MB_queue.send(mevt);
     //		mprintf(0, "MOUSE Scrollwheel: Rolled Down\n");
   }
-
-  return false;
 }
 
-bool sdlMouseMotionFilter(SDL_Event const *event) {
+void sdlMouseMotionEvent(SDL_Event const *event) {
   if (event->type == SDL_EVENT_JOYSTICK_BALL_MOTION) {
     DDIO_mouse_state.dx = event->jball.xrel / 100.0f;
     DDIO_mouse_state.dy = event->jball.yrel / 100.0f;
@@ -408,16 +402,10 @@ bool sdlMouseMotionFilter(SDL_Event const *event) {
     DDIO_mouse_state.y = DDIO_mouse_state.t;
   if (DDIO_mouse_state.y >= DDIO_mouse_state.b)
     DDIO_mouse_state.y = DDIO_mouse_state.b - 1;
-
-  return false;
 }
 
 //	This function will handle all mouse events.
-void ddio_InternalMouseFrame(void) {
-  static unsigned frame_count = 0;
-  SDL_PumpEvents();
-  frame_count++;
-}
+void ddio_InternalMouseFrame(void) {}
 
 /*	x, y = absolute mouse position
         dx, dy = mouse deltas since last call
diff --git a/ddio/sdljoy.cpp b/ddio/sdljoy.cpp
index 5c0d79ea2..713652213 100644
--- a/ddio/sdljoy.cpp
+++ b/ddio/sdljoy.cpp
@@ -341,6 +341,4 @@ static int joyGetNumDevs(void) {
   return found;
 }
 
-void ddio_InternalJoyFrame(void) {
-  // All the work is done already in SDL_PumpEvents()
-}
+void ddio_InternalJoyFrame(void) {}