Added a GLFW/Vulkan backend.

CMakeLists.txt

@@ -95,6 +95,12 @@ if(IMGUI_WITH_BACKEND)
     list(APPEND IMGUI_INTERFACE_LIBS dxgi)
     # list(APPEND IMGUI_INTERFACE_LIBS d3dcompiler)
   endif()
+  if(IMGUI_BACKEND_VULKAN)
+    message(STATUS "[ImGui] Including backend api: [Vulkan]")
+    list(APPEND PUBLIC_H_FILES ${BACKENDS_DIR}/imgui_impl_vulkan.h)
+    list(APPEND PUBLIC_CXX_FILES ${BACKENDS_DIR}/imgui_impl_vulkan.cpp)
+    list(APPEND IMGUI_INTERFACE_LIBS Vulkan)
+  endif()
 endif()
 
 set(PROJECT_FILES
@@ -141,6 +147,10 @@ if(IMGUI_BACKEND_DX12)
   target_compile_definitions(${PROJECT_NAME} PRIVATE ImTextureID=ImU64)
 endif()
 
+if(IMGUI_BACKEND_VULKAN)
+  target_link_libraries(${PROJECT_NAME} PRIVATE glfw vulkan)
+endif()
+
 target_compile_options(${PROJECT_NAME}
   PUBLIC
     $<$<CXX_COMPILER_ID:MSVC>:$<$<CONFIG:Debug>:/MTd>>

CMakeOptions.cmake

@@ -20,7 +20,9 @@ option(IMGUI_WITH_BACKEND
 
 # TODO: Validate configurations based on the given input combination
 # TODO: Add support for other platforms WIN32, SDL, GLFW, GLUT, ANDROID, APPLE, ALLEGRO5
-set(IMGUI_BACKEND_PLATFORM "WIN32" CACHE STRING "")
+if (WIN32)
+  set(IMGUI_BACKEND_PLATFORM "WIN32" CACHE STRING "")
+endif()
 
 
 ##################################################################################################################
@@ -45,3 +47,7 @@ cmake_dependent_option(IMGUI_BACKEND_DX12
   "Set to ON to include DX12 backend files." OFF
   "IMGUI_WITH_BACKEND" ON
 )
+cmake_dependent_option(IMGUI_BACKEND_VULKAN
+  "Set to ON to include Vulkan backend files." OFF
+  "IMGUI_WITH_BACKEND" ON
+)

examples/CMakeLists.txt

@@ -1,6 +1,6 @@
 #
-# ImGui Example App
-# MSVC app using Direct3D9. Similar approach should follow on other platforms.
+# ImGui Example Apps
+# Similar approach should follow on other platforms.
 #
 cmake_minimum_required(VERSION 3.15)
 
@@ -21,7 +21,11 @@ if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
   set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/dist" CACHE PATH "" FORCE)
 endif()
 
-add_subdirectory(win32_dx9)
-add_subdirectory(win32_dx10)
-add_subdirectory(win32_dx11)
-add_subdirectory(win32_dx12)
+if(WIN32)
+  add_subdirectory(win32_dx9)
+  add_subdirectory(win32_dx10)
+  add_subdirectory(win32_dx11)
+  add_subdirectory(win32_dx12)
+else()
+  add_subdirectory(glfw_vulkan)
+endif()

examples/glfw_vulkan/CMakeLists.txt

@@ -0,0 +1,43 @@
+#
+# ImGui Example App
+# Example app using GLFW+Vulkan renderer. Similar approach should follow on other platforms.
+#
+cmake_minimum_required(VERSION 3.15)
+
+
+##################################################################################################################
+# PROJECT
+##################################################################################################################
+
+project(imgui_app_glfw_vulkan
+  LANGUAGES CXX
+  DESCRIPTION "ImGui app."
+)
+
+set(CMAKE_VERBOSE_MAKEFILE TRUE)
+
+get_filename_component(PROJECT_ROOT_DIR "${CMAKE_CURRENT_LIST_DIR}" PATH)
+get_filename_component(PROJECT_ROOT_DIR "${PROJECT_ROOT_DIR}" PATH)
+set(ImGui_INSTALL_DIR "${PROJECT_ROOT_DIR}/build/dist")
+
+set(ImGui_DIR "${ImGui_INSTALL_DIR}/lib/cmake")
+list(APPEND CMAKE_PREFIX_PATH ${ImGui_DIR})
+find_package(ImGui CONFIG REQUIRED)
+
+# CMake's regex engine is almost unusable. Therefore we use native's shell to replace the include headers
+# to match with the wrapped library directory structure.
+set(MAIN_CXX "${PROJECT_ROOT_DIR}/imgui/examples/example_glfw_vulkan/main.cpp")
+set(MAIN_CXX_OUT "${CMAKE_CURRENT_BINARY_DIR}/main.cpp")
+execute_process(COMMAND powershell
+  (Get-Content -Path ${MAIN_CXX})
+  -replace '\(include\\s+\)\"\(imgui.*\)\"', '$1<imgui/$2>' | Out-File ${MAIN_CXX_OUT}
+)
+
+add_executable(${PROJECT_NAME} ${MAIN_CXX_OUT})
+target_link_libraries(${PROJECT_NAME} PRIVATE ImGui::imgui)
+
+# This allows to debug when compiling ImGui as shared library
+string(REPLACE "/" "\\" VS_DEBUGGER_ENV ${ImGui_INSTALL_DIR})
+set_target_properties(${PROJECT_NAME} PROPERTIES VS_DEBUGGER_ENVIRONMENT "PATH=${VS_DEBUGGER_ENV}\\bin;$(PATH)")
+
+install(TARGETS ${PROJECT_NAME})