###############################################################################
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 ()


###############################################################################
file (MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/icd")
include_directories ("${CMAKE_CURRENT_BINARY_DIR}")


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


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

include_directories("${CMAKE_CURRENT_SOURCE_DIR}/specs/include/vulkan")


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


##-----------------------------------------------------------------------------
add_library (cruft-vk-icd STATIC
    ${CMAKE_CURRENT_BINARY_DIR}/icd/dispatch.cpp
    icd/vendor.hpp
    icd/vendor.cpp
    icd/vendor_${VK_LOADER_VENDOR}
)

target_link_libraries (cruft-vk-icd cruft-json cruft)

###############################################################################
list (APPEND sources
    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
)


##-----------------------------------------------------------------------------
add_library (cruft-vk STATIC ${sources})
target_link_libraries (cruft-vk cruft-vk-icd cruft)


###############################################################################
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
            "${CMAKE_CURRENT_BINARY_DIR}/tools")
    target_link_libraries (vk_${t} cruft-vk glfw)
endforeach ()


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


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