###############################################################################
cmake_minimum_required(VERSION 3.7.0)
project(cruft-vulkan CXX)


###############################################################################
find_package (PythonInterp 3 REQUIRED)
find_package (glfw3 REQUIRED)

find_program (GLSLANG glslangValidator)
if (NOT GLSLANG)
    message (FATAL_ERROR "could not locate glslangValidator")
endif ()


###############################################################################
set (GENERATED_BASE "${CMAKE_CURRENT_BINARY_DIR}/prefix")
set (GENERATED_PREFIX "${GENERATED_BASE}/cruft/vk/")
file (MAKE_DIRECTORY "${GENERATED_PREFIX}/load")
file (MAKE_DIRECTORY "${GENERATED_PREFIX}/tools")


if (WIN32)
    set(VK_PLATFORM "win32")
elseif(LINUX)
    set(VK_PLATFORM "xcb")
else()
    message(FATAL_ERROR "unhandled platform")
endif()


##-----------------------------------------------------------------------------
add_custom_command (
OUTPUT
    "${GENERATED_PREFIX}/vk.hpp"
    "${GENERATED_PREFIX}/load/dispatch.cpp"
    "${GENERATED_PREFIX}/load/vtable.hpp"
    "${GENERATED_PREFIX}/tools/trace.cpp"
COMMENT
    "[spec.py] vk.hpp"
COMMAND
    "${PYTHON_EXECUTABLE}"
    "${CMAKE_CURRENT_SOURCE_DIR}/tools/spec.py"
    "--src" "${CMAKE_CURRENT_SOURCE_DIR}/specs/xml/vk.xml"
    "--dst" "${GENERATED_PREFIX}/vk.hpp"
    "--load" "${GENERATED_PREFIX}/load/vtable.hpp"
    "--dispatch" "${GENERATED_PREFIX}/load/dispatch.cpp"
    "--trace" "${GENERATED_PREFIX}/tools/trace.cpp"
    "--platform" "${VK_PLATFORM}"
DEPENDS
    "${CMAKE_CURRENT_SOURCE_DIR}/tools/spec.py"
    "${CMAKE_CURRENT_SOURCE_DIR}/specs/xml/vk.xml"
)



###############################################################################
if (WIN32)
    set(VK_LOADER_VENDOR win32)
elseif (LINUX)
    set(VK_LOADER_VENDOR posix)
else ()
    message (FATAL_ERROR "unhandled vk-loader platform")
endif()


##-----------------------------------------------------------------------------
list (APPEND VK_LOAD_SOURCES
    load/fwd.hpp
    ${GENERATED_PREFIX}/load/vtable.hpp
    ${GENERATED_PREFIX}/load/dispatch.cpp
    load/dispatch.hpp
    load/init.cpp
    load/ostream.cpp
    load/ostream.hpp
    load/vendor.hpp
    load/vendor.cpp
    load/vendor_${VK_LOADER_VENDOR}
    load/vtable.cpp
)


add_library (vulkan SHARED ${VK_LOAD_SOURCES})
set_target_properties(vulkan PROPERTIES VERSION 1.1.98)
set_target_properties(vulkan PROPERTIES SOVERSION 1)

add_library (cruft-vk-load STATIC ${VK_LOAD_SOURCES})

foreach (lib vulkan cruft-vk-load)
    target_include_directories (${lib}
        PUBLIC
            "${CMAKE_CURRENT_SOURCE_DIR}"
            "${GENERATED_PREFIX}"
            "${CMAKE_CURRENT_SOURCE_DIR}/specs/include/vulkan"
    )

    target_link_libraries (${lib} cruft-json cruft)
endforeach ()

###############################################################################
list (APPEND sources
    "${GENERATED_PREFIX}/vk.hpp"

    fwd.hpp
    object.cpp
    object.hpp

    buffer.cpp
    buffer.hpp
    callback.hpp
    command_buffer.cpp
    command_buffer.hpp
    command_pool.cpp
    command_pool.hpp
    device.cpp
    device.hpp
    device_memory.cpp
    device_memory.hpp
    event.cpp
    event.hpp
    except.cpp
    except.hpp
    fence.cpp
    fence.hpp
    framebuffer.cpp
    framebuffer.hpp
    instance.cpp
    instance.hpp
    image.cpp
    image.hpp
    image_view.hpp
    ostream.cpp
    ostream.hpp
    physical_device.cpp
    physical_device.hpp
    pipeline.cpp
    pipeline.hpp
    pipeline_cache.cpp
    pipeline_cache.hpp
    pipeline_layout.cpp
    pipeline_layout.hpp
    queue.cpp
    queue.hpp
    render_pass.cpp
    render_pass.hpp
    semaphore.cpp
    semaphore.hpp
    shader_module.cpp
    shader_module.hpp
    surface.cpp
    surface.hpp
    swapchain.hpp
    traits.cpp
    traits.hpp

    meta/info.cpp
    meta/info.hpp
)


##-----------------------------------------------------------------------------
add_library (cruft-vk STATIC ${sources})
target_link_libraries (cruft-vk cruft)
target_include_directories (cruft-vk
PUBLIC
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${GENERATED_PREFIX}"
    "${CMAKE_CURRENT_SOURCE_DIR}/specs/include/vulkan"
)


###############################################################################
list (APPEND shaders
    tools/hello/shader.vert
    tools/hello/shader.frag
)

foreach (src ${shaders})
    set(src "${CMAKE_CURRENT_SOURCE_DIR}/${src}")
    get_filename_component(ext ${src} EXT)

    get_filename_component(name ${src} DIRECTORY)
    get_filename_component(name ${name} NAME)

    set(label "${name}${ext}.spv")
    set(dst "${CMAKE_CURRENT_BINARY_DIR}/tools/${label}")

    add_custom_command(
        OUTPUT ${dst}
        COMMAND ${GLSLANG} -s -o ${dst} -V100 ${src}
        DEPENDS ${src}
        COMMENT "[glslang] ${label}"
        VERBATIM
    )

    add_custom_target(${label} DEPENDS ${dst})
endforeach ()


###############################################################################
foreach (t info hello)
    add_executable (vk_${t} "tools/${t}.cpp")
    set_target_properties(vk_${t} PROPERTIES
        OUTPUT_NAME
        ${t})
    set_target_properties(vk_${t} PROPERTIES
        RUNTIME_OUTPUT_DIRECTORY
        "${CMAKE_CURRENT_BINARY_DIR}/tools")
endforeach ()

target_link_libraries (vk_info cruft-vk cruft-vk-load)
target_link_libraries (vk_hello ${NC_CXX_STDCXXFS} cruft cruft-vk glfw vulkan)

add_library (trace SHARED
    "${GENERATED_PREFIX}/tools/trace.cpp"
)

target_include_directories (trace
PUBLIC
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${CMAKE_CURRENT_BINARY_DIR}"
    "${CMAKE_CURRENT_SOURCE_DIR}/specs/include/vulkan"
)

target_link_libraries(trace cruft-vk)

##-----------------------------------------------------------------------------
add_dependencies (vk_hello hello.vert.spv hello.frag.spv)


###############################################################################
configure_file(libcruft-vk.pc.in libcruft-vk.pc)
configure_file(Doxyfile.in Doxyfile)