cmake_minimum_required(VERSION 3.4 FATAL_ERROR)
cmake_policy(VERSION 2.8)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")

set(NAME vulkanExamples)

project(${NAME})

include_directories(external)
include_directories(external/glm)
include_directories(external/gli)
include_directories(external/imgui)
include_directories(external/tinygltf)
include_directories(external/ktx/include)
include_directories(external/ktx/other_include)
include_directories(base)

OPTION(USE_D2D_WSI "Build the project using Direct to Display swapchain" OFF)
OPTION(USE_DIRECTFB_WSI "Build the project using DirectFB swapchain" OFF)
OPTION(USE_WAYLAND_WSI "Build the project using Wayland swapchain" OFF)
OPTION(USE_HEADLESS "Build the project using headless extension swapchain" OFF)

set(RESOURCE_INSTALL_DIR "" CACHE PATH "Path to install resources to (leave empty for running uninstalled)")

# Use FindVulkan module added with CMAKE 3.7
if (NOT CMAKE_VERSION VERSION_LESS 3.7.0)
	message(STATUS "Using module to find Vulkan")
	find_package(Vulkan)
endif()

IF(UNIX AND NOT APPLE)
	set(LINUX TRUE)
ENDIF()

IF(WIN32)
	IF (NOT Vulkan_FOUND)
		find_library(Vulkan_LIBRARY NAMES vulkan-1 vulkan PATHS ${CMAKE_SOURCE_DIR}/libs/vulkan)
		IF (Vulkan_LIBRARY)
			set(Vulkan_FOUND ON)
			MESSAGE("Using bundled Vulkan library version")
		ENDIF()
	ENDIF()
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_WIN32_KHR")
ELSEIF(LINUX)
	IF (NOT Vulkan_FOUND)
		find_library(Vulkan_LIBRARY NAMES vulkan HINTS "$ENV{VULKAN_SDK}/lib" "${CMAKE_SOURCE_DIR}/libs/vulkan" REQUIRED)
		IF (Vulkan_LIBRARY)
			set(Vulkan_FOUND ON)
			MESSAGE("Using bundled Vulkan library version")
		ENDIF()
	ENDIF()
	find_package(Threads REQUIRED)
	IF(USE_D2D_WSI)
		MESSAGE("Using direct to display extension...")
		add_definitions(-D_DIRECT2DISPLAY)
	ELSEIF(USE_DIRECTFB_WSI)
		find_package(DirectFB REQUIRED)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_DIRECTFB_EXT")
		include_directories(${DIRECTFB_INCLUDE_DIR})
	ELSEIF(USE_WAYLAND_WSI)
		find_program(PKG_CONFIG pkg-config)
		if (NOT PKG_CONFIG)
			message(FATAL_ERROR "pkg-config binary not found")
		endif ()
		find_package(Wayland REQUIRED)
		if (NOT WAYLAND_FOUND)
			message(FATAL_ERROR "Wayland development package not found")
		endif ()
		pkg_check_modules(WAYLAND_PROTOCOLS REQUIRED wayland-protocols)
		if (NOT WAYLAND_PROTOCOLS_FOUND)
			message(FATAL_ERROR "Wayland protocols package not found")
		endif ()
		find_program(WAYLAND_SCANNER wayland-scanner)
		if (NOT WAYLAND_SCANNER)
			message(FATAL_ERROR "wayland-scanner binary not found")
		endif ()
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_WAYLAND_KHR")
		include_directories(${WAYLAND_INCLUDE_DIR})
		pkg_get_variable(protocol_dir wayland-protocols pkgdatadir)
		execute_process(COMMAND ${WAYLAND_SCANNER} client-header ${protocol_dir}/stable/xdg-shell/xdg-shell.xml ${CMAKE_BINARY_DIR}/xdg-shell-client-protocol.h
				COMMAND ${WAYLAND_SCANNER} private-code ${protocol_dir}/stable/xdg-shell/xdg-shell.xml ${CMAKE_BINARY_DIR}/xdg-shell-protocol.c)
		include_directories(${CMAKE_BINARY_DIR})
	ELSEIF(USE_HEADLESS)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_HEADLESS_EXT")
	ELSE(USE_D2D_WSI)
		find_package(XCB REQUIRED)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_XCB_KHR")
	ENDIF(USE_D2D_WSI)
ELSEIF(APPLE)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DVK_USE_PLATFORM_MACOS_MVK -DVK_EXAMPLE_XCODE_GENERATED")
	# Todo : android?
ENDIF(WIN32)

IF (NOT Vulkan_FOUND)
	message(FATAL_ERROR "Could not find Vulkan library!")
ELSE()
	message(STATUS ${Vulkan_LIBRARY})
ENDIF()

# Set preprocessor defines
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DNOMINMAX -D_USE_MATH_DEFINES")

# Clang specific stuff
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-switch-enum")
endif()


add_definitions(-D_CRT_SECURE_NO_WARNINGS)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

file(GLOB SOURCE *.cpp )

# Build all examples
function(buildExamples)
	foreach(EXAMPLE ${EXAMPLES})
		buildExample(${EXAMPLE})
	endforeach(EXAMPLE)
endfunction(buildExamples)

if(RESOURCE_INSTALL_DIR)
	add_definitions(-DVK_EXAMPLE_ASSETS_DIR=\"${RESOURCE_INSTALL_DIR}/\")
	add_definitions(-DVK_EXAMPLE_SHADERS_DIR=\"${RESOURCE_INSTALL_DIR}/\")
	install(DIRECTORY assets/ DESTINATION ${RESOURCE_INSTALL_DIR}/)
	install(DIRECTORY shaders/ DESTINATION ${RESOURCE_INSTALL_DIR}/)
else()
	add_definitions(-DVK_EXAMPLE_ASSETS_DIR=\"${CMAKE_SOURCE_DIR}/assets/\")
	add_definitions(-DVK_EXAMPLE_SHADERS_DIR=\"${CMAKE_SOURCE_DIR}/shaders/\")
endif()

# Compiler specific stuff
IF(MSVC)
	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHsc")
ELSEIF(APPLE)
	#if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
	#	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fobjc-arc -ObjC++")
	#ELSE()
		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fobjc-arc -xobjective-c++")
	#ENDIF()
ENDIF(MSVC)

IF(WIN32)
	# Nothing here (yet)
ELSEIF(APPLE)
	link_libraries(${Vulkan_LIBRARY} "-framework AppKit" "-framework QuartzCore")
ELSE(WIN32)
	link_libraries(${XCB_LIBRARIES} ${Vulkan_LIBRARY} ${Vulkan_LIBRARY} ${DIRECTFB_LIBRARIES} ${WAYLAND_CLIENT_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
ENDIF(WIN32)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/")

add_subdirectory(base)
add_subdirectory(examples)