diff --git a/3rdparty/CMakeLists.txt b/3rdparty/CMakeLists.txt
index 10a527de..09f27988 100644
--- a/3rdparty/CMakeLists.txt
+++ b/3rdparty/CMakeLists.txt
@@ -75,13 +75,12 @@ if(ISLE_DEBUG)
     )
   else()
     target_sources(imgui PRIVATE
-            ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
-            ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
+        ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
     )
   endif()
 
   target_include_directories(imgui PUBLIC ${imgui_SOURCE_DIR})
-  target_link_libraries(imgui PUBLIC SDL3::Headers)
   target_link_libraries(imgui PRIVATE SDL3::SDL3)
   set_property(TARGET imgui PROPERTY CXX_CLANG_TIDY "")
 endif()
@@ -105,40 +104,3 @@ add_library(libweaver STATIC
     ${libweaver_SOURCE_DIR}/lib/sitypes.cpp
 )
 target_include_directories(libweaver PUBLIC ${libweaver_SOURCE_DIR}/lib)
-
-if(USE_SDL2)
-  if(DOWNLOAD_DEPENDENCIES)
-#    include(FetchContent)
-#    FetchContent_Declare(
-#            SDL2
-#            GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
-#            GIT_TAG 5d249570393f7a37e037abf22cd6012a4cc56a71
-#            EXCLUDE_FROM_ALL
-#    )
-#    FetchContent_MakeAvailable(SDL2)
-    # Find SDL2 normally
-    find_package(SDL2 REQUIRED)
-
-  endif()
-
-  file(GLOB SDL2_HEADERS "${SDL2_INCLUDE_DIR}/*.h")
-  foreach(header IN LISTS SDL2_HEADERS)
-    get_filename_component(fname ${header} NAME)
-    configure_file(${header} ${CMAKE_CURRENT_BINARY_DIR}/sdl3-shim/SDL3/${fname} COPYONLY)
-  endforeach()
-
-
-  add_library(SDL3_shim STATIC
-          sdl3-shim/main.cpp
-  )
-  target_link_libraries(SDL3_shim PRIVATE SDL2::SDL2)
-  target_include_directories(SDL3_shim PUBLIC
-          ${SDL2_INCLUDE_DIRS}
-          "${CMAKE_CURRENT_SOURCE_DIR}/sdl3-shim"
-          "${CMAKE_CURRENT_BINARY_DIR}/sdl3-shim"
-  )
-
-  add_library(SDL3::SDL3 ALIAS SDL3_shim)
-  add_library(SDL3::Headers ALIAS SDL3_shim)
-
-endif()
diff --git a/3rdparty/sdl3-shim/CMakeLists.txt b/3rdparty/sdl3-shim/CMakeLists.txt
new file mode 100644
index 00000000..efba6f52
--- /dev/null
+++ b/3rdparty/sdl3-shim/CMakeLists.txt
@@ -0,0 +1,18 @@
+file(GLOB SDL2_HEADERS "${SDL2_INCLUDE_DIR}/*.h")
+foreach(header IN LISTS SDL2_HEADERS)
+  get_filename_component(fname ${header} NAME)
+  configure_file(${header} ${CMAKE_CURRENT_BINARY_DIR}/SDL3/${fname} COPYONLY)
+endforeach()
+
+add_library(SDL3_shim STATIC
+        main.cpp
+)
+
+target_link_libraries(SDL3_shim PUBLIC SDL2::SDL2)
+target_include_directories(SDL3_shim PUBLIC
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+        "${CMAKE_CURRENT_BINARY_DIR}"
+)
+
+add_library(SDL3::SDL3 ALIAS SDL3_shim)
+add_library(SDL3::Headers ALIAS SDL3_shim)
diff --git a/3rdparty/sdl3-shim/SDL3/SDL.h b/3rdparty/sdl3-shim/SDL3/SDL.h
index 5286997d..fb16f4a3 100644
--- a/3rdparty/sdl3-shim/SDL3/SDL.h
+++ b/3rdparty/sdl3-shim/SDL3/SDL.h
@@ -7,6 +7,7 @@
 #include <SDL2/SDL_keyboard.h>
 #include <SDL2/SDL_video.h>
 #include <SDL2/SDL_mouse.h>
+#include <SDL2/SDL_version.h>
 
 #include "SDL_audio.h"
 #include "SDL_events.h"
diff --git a/3rdparty/sdl3-shim/SDL3/SDL_audio.h b/3rdparty/sdl3-shim/SDL3/SDL_audio.h
index 3520469f..9c66a418 100644
--- a/3rdparty/sdl3-shim/SDL3/SDL_audio.h
+++ b/3rdparty/sdl3-shim/SDL3/SDL_audio.h
@@ -2,6 +2,7 @@
 
 #include "SDL.h"
 
+#include <cstring>
 #include <map>
 #include <mutex>
 
diff --git a/3rdparty/sdl3-shim/SDL3/SDL_pixels.h b/3rdparty/sdl3-shim/SDL3/SDL_pixels.h
index fb8fd71c..6db5885e 100644
--- a/3rdparty/sdl3-shim/SDL3/SDL_pixels.h
+++ b/3rdparty/sdl3-shim/SDL3/SDL_pixels.h
@@ -32,6 +32,16 @@ static bool operator!=(SDL_PixelFormatDetails* lhs, SDL_PixelFormatEnum rhs)
 #define SDL_CreatePalette SDL_AllocPalette
 #define SDL_DestroyPalette SDL_FreePalette
 
-#define SDL_GetPixelFormatForMasks (SDL_PixelFormat)SDL_MasksToPixelFormatEnum
+// #define SDL_GetPixelFormatForMasks (SDL_PixelFormat)SDL_MasksToPixelFormatEnum
+inline SDL_PixelFormatEnum SDL_GetPixelFormatForMasks(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
+{
+	// SDL2 checks if Rmask == 0; SDL3 just returns INDEX8 if Rmask doesn't match
+	// https://github.com/libsdl-org/SDL/blob/66d87bf0e1e29377b398d3c567e1ab3590760d8c/src/video/SDL_pixels.c#L310C5-L321C13
+	// https://github.com/libsdl-org/SDL/blob/3669920fddcc418c5f9aca97e77a3f380308d9c0/src/video/SDL_pixels.c#L411-L418C16
+	if (bpp == 8 && Rmask != 0xE0) {
+		return SDL_PIXELFORMAT_INDEX8;
+	}
+	return static_cast<SDL_PixelFormatEnum>(SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask));
+}
 
 #define SDL_GetSurfacePalette(surface) (nullptr)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 522b3d4a..9fc96826 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,12 +60,6 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}" CACHE PATH "Directory w
 set(ISLE_EMSCRIPTEN_HOST "" CACHE STRING "Host URL for Emscripten streaming (e.g., https://test.com)")
 cmake_dependent_option(BUILD_SHARED_LIBS "Build lego1 as a shared library" ON "NOT EMSCRIPTEN" OFF)
 
-if(USE_SDL2)
-  add_compile_definitions(SDL_MAJOR_VERSION=2)
-else()
-  add_compile_definitions(SDL_MAJOR_VERSION=3)
-endif()
-
 message(STATUS "Isle app:               ${ISLE_BUILD_APP}")
 message(STATUS "Config app:             ${ISLE_BUILD_CONFIG}")
 message(STATUS "Internal DirectX5 SDK:  ${ISLE_USE_DX5}")
@@ -82,27 +76,40 @@ if (DOWNLOAD_DEPENDENCIES)
   include(FetchContent)
 
   if(NOT USE_SDL2)
-  if(ANDROID)
-    # Built by Gradle
-    find_package(SDL3 REQUIRED CONFIG COMPONENTS Shared)
-  else()
-    if (WINDOWS_STORE)
-      FetchContent_Declare(
-        SDL3
-        GIT_REPOSITORY "https://github.com/Helloyunho/SDL3-uwp.git"
-        GIT_TAG "main"
-        EXCLUDE_FROM_ALL
-      )
+    if(ANDROID)
+      # Built by Gradle
+      find_package(SDL3 REQUIRED CONFIG COMPONENTS Shared)
     else()
-      FetchContent_Declare(
-        SDL3
-        GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
-        GIT_TAG "main"
-        EXCLUDE_FROM_ALL
-      )
+      if (WINDOWS_STORE)
+        FetchContent_Declare(
+          SDL3
+          GIT_REPOSITORY "https://github.com/Helloyunho/SDL3-uwp.git"
+          GIT_TAG "main"
+          EXCLUDE_FROM_ALL
+        )
+      else()
+        FetchContent_Declare(
+          SDL3
+          GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
+          GIT_TAG "main"
+          EXCLUDE_FROM_ALL
+        )
+      endif()
+      FetchContent_MakeAvailable(SDL3)
     endif()
-    FetchContent_MakeAvailable(SDL3)
-  endif()
+  else()
+    FetchContent_Declare(
+            SDL2
+            GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
+            GIT_TAG SDL2
+            EXCLUDE_FROM_ALL
+    )
+#    set(SDL_STATIC ON CACHE BOOL "" FORCE)
+#    set(SDL_SHARED OFF CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(SDL2)
+
+    set(SDL2_INCLUDE_DIR ${SDL2_SOURCE_DIR}/include)
+    add_subdirectory(3rdparty/sdl3-shim SYSTEM)
   endif()
 
   FetchContent_Declare(
@@ -121,7 +128,12 @@ else()
   # find_package looks for already-installed system packages.
   # Configure with `-DCMAKE_PREFIX_PATH="/path/to/package1;/path/to/package2"`
   # to add search paths.
-  find_package(SDL3 CONFIG REQUIRED)
+  if(NOT USE_SDL2)
+    find_package(SDL3 CONFIG REQUIRED)
+  else()
+    find_package(SDL2 CONFIG REQUIRED)
+    add_subdirectory(3rdparty/sdl3-shim SYSTEM)
+  endif()
 
   find_package(iniparser REQUIRED CONFIG COMPONENTS shared)
   target_link_libraries(Isle::iniparser INTERFACE iniparser-shared)
diff --git a/ISLE/isledebug.cpp b/ISLE/isledebug.cpp
index 929f9c73..111e05ca 100644
--- a/ISLE/isledebug.cpp
+++ b/ISLE/isledebug.cpp
@@ -18,6 +18,12 @@
 #else
 #include <backends/imgui_impl_sdl2.h>
 #include <backends/imgui_impl_sdlrenderer2.h>
+#define ImGui_ImplSDL3_InitForSDLRenderer ImGui_ImplSDL2_InitForSDLRenderer
+#define ImGui_ImplSDLRenderer3_Init ImGui_ImplSDLRenderer2_Init
+#define ImGui_ImplSDL3_ProcessEvent ImGui_ImplSDL2_ProcessEvent
+#define ImGui_ImplSDLRenderer3_NewFrame ImGui_ImplSDLRenderer2_NewFrame
+#define ImGui_ImplSDL3_NewFrame ImGui_ImplSDL2_NewFrame
+#define ImGui_ImplSDLRenderer3_RenderDrawData ImGui_ImplSDLRenderer2_RenderDrawData
 #endif
 #include <imgui.h>
 
@@ -181,11 +187,7 @@ void IsleDebug_Init()
 		ImGui::CreateContext();
 		ImGui::StyleColorsDark();
 
-#if SDL_MAJOR_VERSION >= 3
 		if (!ImGui_ImplSDL3_InitForSDLRenderer(g_debugWindow, g_debugRenderer)) {
-#else
-		if (!ImGui_ImplSDL2_InitForSDLRenderer(g_debugWindow, g_debugRenderer)) {
-#endif
 			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "ImGui_ImplSDL3_InitForSDLRenderer failed");
 			g_debugEnabled = false;
 			break;
@@ -197,11 +199,7 @@ void IsleDebug_Init()
 #else
 		SDL_SetTextureScaleMode(g_videoPalette, SDL_SCALEMODE_NEAREST);
 #endif
-#if SDL_MAJOR_VERSION >= 3
 		if (!ImGui_ImplSDLRenderer3_Init(g_debugRenderer)) {
-#else
-		if (!ImGui_ImplSDLRenderer2_Init(g_debugRenderer)) {
-#endif
 			g_debugEnabled = false;
 			break;
 		}
@@ -262,11 +260,7 @@ bool IsleDebug_Event(SDL_Event* event)
 	if (SDL_GetWindowFromEvent(event) != g_debugWindow) {
 		return false;
 	}
-#if SDL_MAJOR_VERSION >= 3
 	ImGui_ImplSDL3_ProcessEvent(event);
-#else
-	ImGui_ImplSDL2_ProcessEvent(event);
-#endif
 	return true;
 }
 
@@ -276,13 +270,9 @@ void IsleDebug_Render()
 		return;
 	}
 	const ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
-#if SDL_MAJOR_VERSION >= 3
+
 	ImGui_ImplSDLRenderer3_NewFrame();
 	ImGui_ImplSDL3_NewFrame();
-#else
-	ImGui_ImplSDLRenderer2_NewFrame();
-	ImGui_ImplSDL2_NewFrame();
-#endif
 	ImGui::NewFrame();
 	ImGuiIO& io = ImGui::GetIO();
 	{
@@ -375,11 +365,7 @@ void IsleDebug_Render()
 		(Uint8) (clear_color.z * 255),
 		(Uint8) (clear_color.w * 255)
 	);
-#if SDL_MAJOR_VERSION >= 3
 	ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), g_debugRenderer);
-#else
-	ImGui_ImplSDLRenderer2_RenderDrawData(ImGui::GetDrawData(), g_debugRenderer);
-#endif
 	SDL_RenderPresent(g_debugRenderer);
 }
 
diff --git a/LEGO1/lego/legoomni/src/common/legoutils.cpp b/LEGO1/lego/legoomni/src/common/legoutils.cpp
index ac1c3290..0eb9b6e5 100644
--- a/LEGO1/lego/legoomni/src/common/legoutils.cpp
+++ b/LEGO1/lego/legoomni/src/common/legoutils.cpp
@@ -34,6 +34,7 @@
 #include <SDL3/SDL_events.h>
 #include <SDL3/SDL_process.h>
 #include <SDL3/SDL_stdinc.h>
+#include <SDL3/SDL_version.h>
 #include <stdio.h>
 #include <string.h>
 #include <vec.h>
diff --git a/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp b/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
index 52f448f3..8ad6132b 100644
--- a/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
+++ b/LEGO1/lego/legoomni/src/input/legoinputmanager.cpp
@@ -12,6 +12,7 @@
 #include "roi/legoroi.h"
 
 #include <SDL3/SDL_log.h>
+#include <SDL3/SDL_version.h>
 
 DECOMP_SIZE_ASSERT(LegoInputManager, 0x338)
 DECOMP_SIZE_ASSERT(LegoNotifyList, 0x18)
diff --git a/LEGO1/mxdirectx/mxdirectxinfo.cpp b/LEGO1/mxdirectx/mxdirectxinfo.cpp
index c89ebbd3..3cee2c53 100644
--- a/LEGO1/mxdirectx/mxdirectxinfo.cpp
+++ b/LEGO1/mxdirectx/mxdirectxinfo.cpp
@@ -3,6 +3,7 @@
 #include "omni/include/mxvideoparam.h"
 
 #include <SDL3/SDL_log.h>
+#include <SDL3/SDL_version.h>
 #include <assert.h>
 #include <miniwin/miniwind3d.h>
 #include <stdio.h> // for vsprintf
diff --git a/LEGO1/omni/src/system/mxthread.cpp b/LEGO1/omni/src/system/mxthread.cpp
index 00c093b5..ad072070 100644
--- a/LEGO1/omni/src/system/mxthread.cpp
+++ b/LEGO1/omni/src/system/mxthread.cpp
@@ -3,6 +3,7 @@
 #include "decomp.h"
 
 #include <SDL3/SDL_timer.h>
+#include <SDL3/SDL_version.h>
 
 DECOMP_SIZE_ASSERT(MxThread, 0x1c)