From b18692657a32b8b5565b3058818588b01b1081e4 Mon Sep 17 00:00:00 2001
From: Dan Paulat <dpaulat@gmail.com>
Date: Fri, 25 Nov 2022 00:41:20 -0600
Subject: [PATCH] Adding Qt ImGui backend

---
 .gitmodules               |  3 +++
 external/imgui-backend-qt |  1 +
 external/imgui.cmake      | 19 +++++++++++++++++--
 scwx-qt/scwx-qt.cmake     |  2 +-
 4 files changed, 22 insertions(+), 3 deletions(-)
 create mode 160000 external/imgui-backend-qt

diff --git a/.gitmodules b/.gitmodules
index debb3932..da689926 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,3 +22,6 @@
 [submodule "external/imgui"]
 	path = external/imgui
 	url = https://github.com/ocornut/imgui.git
+[submodule "external/imgui-backend-qt"]
+	path = external/imgui-backend-qt
+	url = ../imgui-backend-qt
diff --git a/external/imgui-backend-qt b/external/imgui-backend-qt
new file mode 160000
index 00000000..69447758
--- /dev/null
+++ b/external/imgui-backend-qt
@@ -0,0 +1 @@
+Subproject commit 6944775887e61d4d8185568e0205af5b3b483801
diff --git a/external/imgui.cmake b/external/imgui.cmake
index 8f6d4d82..55b2cd00 100644
--- a/external/imgui.cmake
+++ b/external/imgui.cmake
@@ -1,6 +1,15 @@
 cmake_minimum_required(VERSION 3.20)
 set(PROJECT_NAME scwx-imgui)
 
+find_package(QT NAMES Qt6
+             COMPONENTS Gui
+                        Widgets
+             REQUIRED)
+find_package(Qt${QT_VERSION_MAJOR}
+             COMPONENTS Gui
+                        Widgets
+             REQUIRED)
+
 set(IMGUI_SOURCES imgui/imconfig.h
                   imgui/imgui.cpp
                   imgui/imgui.h
@@ -13,12 +22,18 @@ set(IMGUI_SOURCES imgui/imconfig.h
                   imgui/imstb_textedit.h
                   imgui/imstb_truetype.h
                   imgui/backends/imgui_impl_opengl3.cpp
-                  imgui/backends/imgui_impl_opengl3.h)
+                  imgui/backends/imgui_impl_opengl3.h
+                  imgui-backend-qt/backends/imgui_impl_qt.cpp
+                  imgui-backend-qt/backends/imgui_impl_qt.hpp)
 
 add_library(imgui STATIC ${IMGUI_SOURCES})
 
 target_include_directories(imgui PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/imgui)
 
-set(IMGUI_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/imgui PARENT_SCOPE)
+target_link_libraries(imgui PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+
+set(IMGUI_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/imgui
+                       ${CMAKE_CURRENT_SOURCE_DIR}/imgui-backend-qt
+    PARENT_SCOPE)
 
 set_target_properties(imgui PROPERTIES FOLDER imgui)
diff --git a/scwx-qt/scwx-qt.cmake b/scwx-qt/scwx-qt.cmake
index b4163326..430af964 100644
--- a/scwx-qt/scwx-qt.cmake
+++ b/scwx-qt/scwx-qt.cmake
@@ -293,7 +293,7 @@ endif()
 
 target_include_directories(scwx-qt PUBLIC ${scwx-qt_SOURCE_DIR}/source
                                           ${FTGL_INCLUDE_DIR}
-                                          ${IMGUI_INCLUDE_DIR}
+                                          ${IMGUI_INCLUDE_DIRS}
                                           ${MBGL_INCLUDE_DIR}
                                           ${STB_INCLUDE_DIR})