cmake_minimum_required(VERSION 3.13)

if(NOT DILIGENT_CORE_FOUND)
	message(FATAL_ERROR "DiligentCore module is not found. To build the samples and tutorials, please clone the main repository as described in the documentation (see https://github.com/DiligentGraphics/DiligentSamples/blob/master/README.md)")
endif()
if(NOT DILIGENT_TOOLS_FOUND)
	message(FATAL_ERROR "DiligentTools module is not found. Please add DiligentTools module to the project before DiligentSamples module.")
endif()
if(NOT DILIGENT_FX_FOUND)
	message(FATAL_ERROR "DiligentFX module is not found. Please add DiligentFX module to the project before DiligentSamples module.")
endif()

set(DILIGENT_SAMPLES_FOUND TRUE CACHE INTERNAL "DiligentSamples module is found")

if(PLATFORM_WIN32 OR PLATFORM_LINUX)
    option(DILIGENT_INSTALL_SAMPLES "Enable installation of samples and tutorials" ON)
else()
    set(DILIGENT_INSTALL_SAMPLES OFF)
endif()

option(DILIGENT_BUILD_SAMPLE_BASE_ONLY                "Build only SampleBase project" OFF)
option(DILIGENT_EMSCRIPTEN_INCLUDE_COI_SERVICE_WORKER "Include cross-origin isolation service worker in each emscripten build" OFF)

# Adds a sample application target.
#
# Parameters:
#   APP_NAME - Name of the application
#   SOURCES - List of source files
#   INCLUDES - List of include directories
#   SHADERS - List of shader files
#   ASSETS - List of asset files
#   IDE_FOLDER - Optional folder name for IDE
#   DXC_REQUIRED - Indicates if DXC compiler is required for the sample (optional, default is OFF)
#
# Example:
#
#   add_sample_app(Tutorial03_Texturing
#       IDE_FOLDER
#           DiligentSamples/Tutorials
#       SOURCES
#           src/Tutorial03_Texturing.cpp
#       INCLUDES
#           src/Tutorial03_Texturing.hpp
#       SHADERS
#           assets/cube.vsh
#           assets/cube.psh
#       ASSETS
#           assets/DGLogo.png
#   )
#
function(add_sample_app APP_NAME)

    set(options)
    set(oneValueArgs IDE_FOLDER DXC_REQUIRED)
    set(multiValueArgs SOURCES INCLUDES SHADERS ASSETS)
    cmake_parse_arguments(PARSE_ARGV 1 arg "${options}" "${oneValueArgs}" "${multiValueArgs}")
    if (arg_DXC_REQUIRED)
        set(DXC_REQUIRED ${arg_DXC_REQUIRED})
	else()
		set(DXC_REQUIRED NO)
    endif()

    set_source_files_properties(${arg_SHADERS} PROPERTIES VS_TOOL_OVERRIDE "None")
    set(ALL_ASSETS ${arg_ASSETS} ${arg_SHADERS})
    add_target_platform_app(${APP_NAME} "${arg_SOURCES}" "${arg_INCLUDES}" "${ALL_ASSETS}")

    set_source_files_properties(${ALL_ASSETS} PROPERTIES
        VS_DEPLOYMENT_LOCATION "."
        MACOSX_PACKAGE_LOCATION "Resources"
    )

    if(PLATFORM_WIN32)
        set_target_properties(${APP_NAME} PROPERTIES 
            VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/assets"
        )
        copy_required_dlls(${APP_NAME} DXC_REQUIRED ${DXC_REQUIRED})
        append_sample_base_win32_source(${APP_NAME})
    elseif(PLATFORM_UNIVERSAL_WINDOWS)
        append_sample_base_uwp_source(${APP_NAME})
        package_required_dlls(${APP_NAME} DXC_REQUIRED ${DXC_REQUIRED})
    endif()

    target_include_directories(${APP_NAME}
    PRIVATE
        src
    )

    target_link_libraries(${APP_NAME}
    PRIVATE
        # On Linux we must have Diligent-NativeAppBase go first, otherwise the linker 
        # will fail to resolve Diligent::CreateApplication() function.
        Diligent-NativeAppBase
        Diligent-BuildSettings
        Diligent-SampleBase
    )
    set_common_target_properties(${APP_NAME})

    if(MSVC)
        # Disable MSVC-specific warnings
        # - w4201: nonstandard extension used: nameless struct/union
        target_compile_options(${APP_NAME} PRIVATE /wd4201)
    endif()

    if(arg_IDE_FOLDER)
        set_target_properties(${APP_NAME} PROPERTIES
            FOLDER ${arg_IDE_FOLDER}
        )
    endif()

    source_group("src" FILES ${arg_SOURCES} ${arg_INCLUDES})
    source_group("assets" FILES ${ALL_ASSETS})

    target_sources(${APP_NAME} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/readme.md")
    set_source_files_properties(
        "${CMAKE_CURRENT_SOURCE_DIR}/readme.md" PROPERTIES HEADER_FILE_ONLY TRUE
    )

    if(PLATFORM_WIN32 OR PLATFORM_LINUX)
        # Copy assets to target folder
        add_custom_command(TARGET ${APP_NAME} POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy_directory
                "${CMAKE_CURRENT_SOURCE_DIR}/assets"
                "\"$<TARGET_FILE_DIR:${APP_NAME}>\"")
    endif()

    if(PLATFORM_MACOS AND VULKAN_LIB_PATH)
        # Configure rpath so that executables can find vulkan library
        set_target_properties(${APP_NAME} PROPERTIES
            BUILD_RPATH "${VULKAN_LIB_PATH}"
        )
    endif()

    if(PLATFORM_WEB)
        set(RESOURCE_PATH "${PROJECT_SOURCE_DIR}/assets/")
        target_link_options(${APP_NAME} PRIVATE "SHELL: -s ALLOW_MEMORY_GROWTH=1 -s MAXIMUM_MEMORY=4GB --preload-file ${RESOURCE_PATH}@")

        if (${APP_NAME} STREQUAL "GLTFViewer")
            set(EXCLUDE_DIRECTORIES
                ".git"
                "BarbieDodgePickup"
                "IridescentDishWithOlives"
            )

            foreach(EXCLUDE_DIR IN LISTS EXCLUDE_DIRECTORIES)
                target_link_options(${APP_NAME} PRIVATE "SHELL: --exclude-file=${PROJECT_SOURCE_DIR}/assets/models/${EXCLUDE_DIR}")
            endforeach()
        endif()
        append_sample_base_emscripten_source(${APP_NAME})
    endif()

    if(DILIGENT_INSTALL_SAMPLES)
        # Install instructions
        file(RELATIVE_PATH TUTORIAL_REL_PATH "${CMAKE_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")
        install(TARGETS     ${APP_NAME}
                DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>")

        if(PLATFORM_LINUX OR PLATFORM_WIN32)
            install(DIRECTORY   "${CMAKE_CURRENT_SOURCE_DIR}/assets/"
                    DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>")
        endif()

        if(PLATFORM_WIN32)
            get_supported_backends(BACKEND_LIBRARIES)
            install(TARGETS  ${BACKEND_LIBRARIES}
                    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>"
                    LIBRARY DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>"
                    ARCHIVE DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>")

            # Dawn uses DXC, so we need to copy the DXC dlls even if DXC_REQUIRED is not set
            # to get consistent shader compilation results
            if(((DXC_REQUIRED AND D3D12_SUPPORTED) OR WEBGPU_SUPPORTED) AND DXC_COMPILER_PATH AND DXIL_SIGNER_PATH)
                install(FILES "${DXC_COMPILER_PATH}" "${DXIL_SIGNER_PATH}"
                        DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>")
            endif()
            if(DXC_REQUIRED AND VULKAN_SUPPORTED AND DILIGENT_DXCOMPILER_FOR_SPIRV_PATH AND EXISTS "${DILIGENT_DXCOMPILER_FOR_SPIRV_PATH}")
                install(FILES "${DILIGENT_DXCOMPILER_FOR_SPIRV_PATH}"
                        DESTINATION "${CMAKE_INSTALL_BINDIR}/${TUTORIAL_REL_PATH}/$<CONFIG>"
                        RENAME spv_dxcompiler.dll)
            endif()
        endif()

        if(PLATFORM_LINUX)
            set_target_properties(${APP_NAME} PROPERTIES
                INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/${DILIGENT_CORE_DIR}/${CMAKE_BUILD_TYPE}"
            )
        endif()
    endif()

endfunction()

add_subdirectory(ThirdParty)

if(TARGET Diligent-NativeAppBase AND TARGET Diligent-TextureLoader AND TARGET Diligent-Imgui)
    add_subdirectory(SampleBase)
endif()

if(NOT ${DILIGENT_BUILD_SAMPLE_BASE_ONLY} AND TARGET Diligent-SampleBase)
    add_subdirectory(Samples)
    add_subdirectory(Tutorials)
endif()

if(PLATFORM_ANDROID)
    add_subdirectory(Android/HelloAR)
endif()

if(NOT ${DILIGENT_BUILD_SAMPLE_BASE_ONLY} AND (D3D11_SUPPORTED OR D3D12_SUPPORTED OR GL_SUPPORTED OR GLES_SUPPORTED))
    add_subdirectory(UnityPlugin)
endif()

# Create a custom target to run source code formatting validation command
add_format_validation_target(DiligentSamples "${CMAKE_CURRENT_SOURCE_DIR}" DiligentSamples)

if (PLATFORM_WEB)
    set(HTTPS_SERVER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/SampleBase/src/Emscripten/resources/https_server.py)
    set(HTTPS_SERVER_OUTPUT_DIR ${CMAKE_BINARY_DIR})
    file(COPY ${HTTPS_SERVER_SCRIPT} DESTINATION ${HTTPS_SERVER_OUTPUT_DIR}) 
endif()