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コード生成や、Shader の事前コンパイル

add_custom_command

function(add_shader TARGET SHADER)
  find_program(GLSLC glslc HINTS $ENV{VULKAN_SDK}/Include/Bin)
  set(current-input-path ${CMAKE_CURRENT_LIST_DIR}/${SHADER})
  set(current-output-path ${CMAKE_CURRENT_BINARY_DIR}/${SHADER}.spv)
  add_custom_command(
    OUTPUT ${current-output-path}
    COMMAND ${GLSLC} -o ${current-output-path} ${current-input-path}
    DEPENDS ${current-input-path}
    IMPLICIT_DEPENDS CXX ${current-shader-path}
    VERBATIM)
  set_source_files_properties(${current-output-path} PROPERTIES GENERATED TRUE)
  target_sources(${TARGET} PRIVATE ${current-output-path})
endfunction(add_shader)

${CMAKE_CURRENT_BINARY_DIR} や ${CMAKE_CURRENT_BINARY_DIR} などは 関数定義時ではなく実行時の内容になるぽい。

add_custom_target