From 716b96bd6f247a52733b38998988bbc29984d7bc Mon Sep 17 00:00:00 2001
From: fleroviux <fleroviux@gmail.com>
Date: Tue, 2 Jan 2024 23:27:22 +0100
Subject: [PATCH] arm7: stub EXTKEYIN register

---
 src/dual/src/nds/arm7/memory.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/dual/src/nds/arm7/memory.cpp b/src/dual/src/nds/arm7/memory.cpp
index 721a48b..c1a4204 100644
--- a/src/dual/src/nds/arm7/memory.cpp
+++ b/src/dual/src/nds/arm7/memory.cpp
@@ -1,4 +1,6 @@
 
+#include <SDL.h>
+
 #include <dual/nds/arm7/memory.hpp>
 
 namespace dual::nds::arm7 {
@@ -35,6 +37,17 @@ namespace dual::nds::arm7 {
         return atom::read<T>(m_swram.arm7.data, address & m_swram.arm7.mask);
       }
       case 0x04: {
+        if(address == 0x04000136) {
+          const u8* key_state = SDL_GetKeyboardState(nullptr);
+
+          u16 extkeyinput = 0x3Fu;
+
+          if(key_state[SDL_SCANCODE_Q]) extkeyinput &= ~1u;
+          if(key_state[SDL_SCANCODE_W]) extkeyinput &= ~2u;
+
+          return extkeyinput;
+        }
+
         if constexpr(std::is_same_v<T, u8 >) return m_io.ReadByte(address);
         if constexpr(std::is_same_v<T, u16>) return m_io.ReadHalf(address);
         if constexpr(std::is_same_v<T, u32>) return m_io.ReadWord(address);