[TODO] Add shader compilation on cmake

[edunad]

Taken from https://github.com/DiligentGraphics/DiligentSamples/blob/master/Samples/Asteroids/CMakeLists.txt

set_source_files_properties(${SHADERS} PROPERTIES VS_TOOL_OVERRIDE "None")

set(COMPILED_SHADERS_DIR ${CMAKE_CURRENT_BINARY_DIR}/CompiledShaders)
file(MAKE_DIRECTORY "${COMPILED_SHADERS_DIR}")

foreach(SRC_SHADER ${SHADERS})
    get_filename_component(SHADER_NAME ${SRC_SHADER} NAME_WE)
    get_filename_component(SHADER_EXT ${SRC_SHADER} EXT)
    set(COMPILED_SHADER ${COMPILED_SHADERS_DIR}/${SHADER_NAME}.h)
    list(APPEND COMPILED_SHADERS ${COMPILED_SHADER})

    set(PROFILE vs_5_0)
    if(${SHADER_NAME} STREQUAL "asteroid_ps")
        set(PROFILE ps_5_1)
    elseif(${SHADER_EXT} STREQUAL ".psh")
        set(PROFILE ps_5_0)
    endif()

    add_custom_command(OUTPUT ${COMPILED_SHADER} # We must use full path here!
                       COMMAND fxc /T ${PROFILE} /E ${SHADER_NAME} /Vn g_${SHADER_NAME} /Fh "${COMPILED_SHADER}" "${SRC_SHADER}"
                       WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
                       COMMENT "Compiling ${SRC_SHADER}"
                       VERBATIM
    )
endforeach(SRC_SHADER)

# NB: we must use the full path, otherwise the build system will not be able to properly detect
#     changes and shader compilation custom command will run every time
set_source_files_properties(${COMPILED_SHADERS} PROPERTIES GENERATED TRUE)