From 2b7287452c11d1ac06b825ba5e94ba414b7ef3e6 Mon Sep 17 00:00:00 2001
From: Joshua Peisach <itzswirlz2020@outlook.com>
Date: Sun, 29 Jun 2025 10:33:08 -0400
Subject: [PATCH] Create 3DS default config overrides

---
 CMakeLists.txt          |  3 +++
 ISLE/3ds/filesystem.cpp | 31 +++++++++++++++++++++++++++++++
 ISLE/3ds/filesystem.h   |  8 ++++++++
 ISLE/isleapp.cpp        |  7 +++++++
 4 files changed, 49 insertions(+)
 create mode 100644 ISLE/3ds/filesystem.cpp
 create mode 100644 ISLE/3ds/filesystem.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a61449f6..7fbdc80d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -646,6 +646,9 @@ endif()
 set(CPACK_PACKAGE_DIRECTORY "dist")
 set(CPACK_PACKAGE_FILE_NAME "isle-${PROJECT_VERSION}-${ISLE_PACKAGE_NAME}-${CMAKE_SYSTEM_PROCESSOR}")
 if(NINTENDO_3DS)
+  target_sources(isle PRIVATE
+    ISLE/3ds/filesystem.cpp
+  )
   ctr_generate_smdh(isle.smdh
     NAME "LEGO Island"
     TITLE "LEGO Island"
diff --git a/ISLE/3ds/filesystem.cpp b/ISLE/3ds/filesystem.cpp
new file mode 100644
index 00000000..ff452d8a
--- /dev/null
+++ b/ISLE/3ds/filesystem.cpp
@@ -0,0 +1,31 @@
+#include "filesystem.h"
+
+#include <SDL3/SDL_log.h>
+#include <iniparser.h>
+
+void N3DS_SetupDefaultConfigOverrides(dictionary* p_dictionary)
+{
+	SDL_Log("Overriding default config for 3DS");
+
+	// We are currently not bundling the assets into romfs.
+	// User must place assets in sdmc:/3ds/isle where
+	// sdmc:/3ds/isle/LEGO/SCRIPTS/CREDITS.si exists, for example.
+	iniparser_set(p_dictionary, "isle:diskpath", "sdmc:/3ds/isle/LEGO/disk");
+	iniparser_set(p_dictionary, "isle:cdpath", "sdmc:/3ds/isle");
+
+	// TODO: Save path: can we use libctru FS save data functions? Would be neat, especially for CIA install
+	// Extra / at the end causes some issues
+	iniparser_set(p_dictionary, "isle:savepath", "sdmc:/3ds/isle");
+
+	// We are currently just rendering to the touch screen
+	iniparser_set(p_dictionary, "isle:Full Screen", "true");
+
+	// Wide view angle takes more resources
+	iniparser_set(p_dictionary, "isle:Wide View Angle", "false");
+
+	// Set back buffers in video RAM
+	iniparser_set(p_dictionary, "isle:Back Buffers in Video RAM", "1");
+
+	// Use e_noAnimation/cut transition
+	iniparser_set(p_dictionary, "isle:Transition Type", "1");
+}
diff --git a/ISLE/3ds/filesystem.h b/ISLE/3ds/filesystem.h
new file mode 100644
index 00000000..699fd52b
--- /dev/null
+++ b/ISLE/3ds/filesystem.h
@@ -0,0 +1,8 @@
+#ifndef N3DS_FILESYSTEM_H
+#define N3DS_FILESYSTEM_H
+
+#include "dictionary.h"
+
+void N3DS_SetupDefaultConfigOverrides(dictionary* p_dictionary);
+
+#endif // N3DS_FILESYSTEM_H
diff --git a/ISLE/isleapp.cpp b/ISLE/isleapp.cpp
index 62c156ff..a460c899 100644
--- a/ISLE/isleapp.cpp
+++ b/ISLE/isleapp.cpp
@@ -50,6 +50,10 @@
 #include "emscripten/messagebox.h"
 #endif
 
+#ifdef __3DS__
+#include "3ds/filesystem.h"
+#endif
+
 DECOMP_SIZE_ASSERT(IsleApp, 0x8c)
 
 // GLOBAL: ISLE 0x410030
@@ -824,6 +828,9 @@ bool IsleApp::LoadConfig()
 		iniparser_set(dict, "isle:Max Allowed Extras", SDL_itoa(m_maxAllowedExtras, buf, 10));
 		iniparser_set(dict, "isle:Transition Type", SDL_itoa(m_transitionType, buf, 10));
 
+#ifdef __3DS__
+		N3DS_SetupDefaultConfigOverrides(dict);
+#endif
 		iniparser_dump_ini(dict, iniFP);
 		SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "New config written at '%s'", iniConfig);
 		fclose(iniFP);