From f90f50e10e18ab3bdbe1f3d96dd9c9739f85ee45 Mon Sep 17 00:00:00 2001
From: Martin Valgur <martin.valgur@gmail.com>
Date: Thu, 19 Sep 2024 15:37:17 +0300
Subject: [PATCH] ogre: unvendor imgui

---
 recipes/ogre/1.x/CMakeLists.txt |  6 ++++++
 recipes/ogre/1.x/conanfile.py   | 19 +++++++++++++------
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/recipes/ogre/1.x/CMakeLists.txt b/recipes/ogre/1.x/CMakeLists.txt
index 780adf8f2b697..bbf97e40eb77a 100644
--- a/recipes/ogre/1.x/CMakeLists.txt
+++ b/recipes/ogre/1.x/CMakeLists.txt
@@ -39,6 +39,12 @@ endif()
 
 add_subdirectory(src)
 
+if(TARGET OgreOverlay AND OGRE_BUILD_COMPONENT_OVERLAY_IMGUI)
+    find_package(imgui REQUIRED CONFIG)
+    target_sources(OgreOverlay PRIVATE ${CONAN_IMGUI_SRC}/misc/freetype/imgui_freetype.cpp)
+    target_include_directories(OgreOverlay PRIVATE ${CONAN_IMGUI_SRC}/misc/freetype)
+    target_link_libraries(OgreOverlay PUBLIC imgui::imgui)
+endif()
 if(TARGET Codec_FreeImage)
     target_link_libraries(Codec_FreeImage PUBLIC freeimage::freeimage)
 endif()
diff --git a/recipes/ogre/1.x/conanfile.py b/recipes/ogre/1.x/conanfile.py
index 63baee1c438ca..79003e07faf5a 100644
--- a/recipes/ogre/1.x/conanfile.py
+++ b/recipes/ogre/1.x/conanfile.py
@@ -262,10 +262,9 @@ def requirements(self):
             self.requires("bullet3/3.25")
         if self.options.build_component_overlay:
             self.requires("freetype/2.13.2")
-            # TODO: unvendor imgui
-            # if self.options.build_component_overlay_imgui:
-            #     # Used in Overlay/OgreImGuiOverlay.h public heder
-            #     self.requires("imgui/1.91.0", transitive_headers=True, transitive_libs=True)
+            if self.options.build_component_overlay_imgui:
+                # Used in Overlay/OgreImGuiOverlay.h public heder
+                self.requires("imgui/1.91.0", transitive_headers=True, transitive_libs=True)
         if self.options.build_plugin_assimp:
             self.requires("assimp/5.4.2")
         if self.options.build_plugin_exrcodec:
@@ -407,6 +406,8 @@ def generate(self):
         tc.variables["OGRE_PLUGINS_PATH"] = self._to_cmake_path(self._plugins_dir)
         tc.variables["OGRE_MEDIA_PATH"] = self._to_cmake_path(self._media_dir)
         tc.variables["OGRE_CFG_INSTALL_PATH"] = self._to_cmake_path(self._config_dir)
+        if self.options.get_safe("build_component_overlay_imgui"):
+            tc.variables["CONAN_IMGUI_SRC"] = os.path.join(self.dependencies["imgui"].package_folder, "res")
         tc.generate()
 
         deps = CMakeDeps(self)
@@ -433,6 +434,12 @@ def _patch_sources(self):
         rmdir(self, os.path.join(self.source_folder, "PlugIns", "STBICodec", "src", "stbi"))
         replace_in_file(self, os.path.join(self.source_folder, "PlugIns", "STBICodec", "src", "OgreSTBICodec.cpp"),
                         '#include "stbi/', '#include "')
+        # Unvendor imgui in Overlay
+        # https://github.com/OGRECave/ogre/blob/v14.2.6/Components/Overlay/CMakeLists.txt#L21-L43
+        replace_in_file(self, os.path.join(self.source_folder, "Components", "Overlay", "CMakeLists.txt"),
+                        "if(OGRE_BUILD_COMPONENT_OVERLAY_IMGUI)", "if(0)")
+        replace_in_file(self, os.path.join(self.source_folder, "Components", "Overlay", "CMakeLists.txt"),
+                        "list(REMOVE_ITEM SOURCE_FILES", "# list(REMOVE_ITEM SOURCE_FILES")
 
     def build(self):
         self._patch_sources()
@@ -583,8 +590,8 @@ def _add_plugin_component(comp, *, requires=None):
             _add_core_component("MeshLodGenerator")
         if self.options.build_component_overlay:
             _add_core_component("Overlay", requires=["freetype::freetype"])
-            # if self.options.get_safe("build_component_overlay_imgui"):
-            #     self.cpp_info.components["Overlay"].requires.append("imgui::imgui")
+            if self.options.get_safe("build_component_overlay_imgui"):
+                self.cpp_info.components["Overlay"].requires.append("imgui::imgui")
         if self.options.build_component_paging:
             _add_core_component("Paging")
         if self.options.build_component_property: