feat: add imgui

.gitmodules

@@ -7,3 +7,7 @@
 [submodule "external/acutest"]
 	path = external/acutest
 	url = https://github.com/mity/acutest
+[submodule "external/imgui"]
+	path = external/imgui
+	url = https://github.com/ocornut/imgui.git
+	branch = 1.9.4-docking

CMakeLists.txt

@@ -14,7 +14,11 @@ add_subdirectory(external/raylib)
 # -------------------------
 add_subdirectory(external/angelscript/sdk/angelscript/projects/cmake)
 
-
+# -------------------------
+# Dear ImGui (docking branch)
+# -------------------------
+# Ensure the submodule exists at external/imgui (added with git submodule)
+add_subdirectory(cmake/imgui)
 # -------------------------
 # Tests
 # -------------------------
@@ -61,6 +65,7 @@ target_include_directories(simian PUBLIC
     external/angelscript/sdk/angelscript/include
     external/angelscript/sdk/add_on/scriptstdstring
     external/angelscript/sdk/add_on/scriptbuilder
+     external/imgui     
 )
 
 target_link_libraries(simian
@@ -68,6 +73,7 @@ target_link_libraries(simian
     angelscript
     scriptstdstring
     scriptbuilder
+    imgui
 )
 
 # -------------------------

cmake/imgui/CMakeLists.txt

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.10)
+project(imgui_wrapper NONE)
+
+# Root of the imgui submodule
+set(IMGUI_ROOT "${CMAKE_SOURCE_DIR}/external/imgui")
+
+if(NOT EXISTS "${IMGUI_ROOT}/imgui.h")
+    message(FATAL_ERROR "ImGui not found in ${IMGUI_ROOT}. Run: git submodule update --init --recursive")
+endif()
+
+# Gather core sources and optional backend sources if present
+file(GLOB IMGUI_CORE_SRCS "${IMGUI_ROOT}/*.cpp")
+file(GLOB IMGUI_BACKEND_SRCS "${IMGUI_ROOT}/backends/*.cpp")
+
+# Exclude example / main files if any sneak in
+list(FILTER IMGUI_CORE_SRCS EXCLUDE REGEX ".*example.*|.*main.*")
+
+set(IMGUI_SOURCES ${IMGUI_CORE_SRCS} ${IMGUI_BACKEND_SRCS})
+
+add_library(imgui STATIC ${IMGUI_SOURCES})
+
+target_include_directories(imgui PUBLIC
+    ${IMGUI_ROOT}
+)
+
+# Optional: keep PIC for static linking on some platforms
+set_target_properties(imgui PROPERTIES POSITION_INDEPENDENT_CODE ON)