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find_program(GLSLC_PATH glslc)
# Add an option for this so that this can be disabled locally when not needed
option(SHADERS_ENABLE_COMPILATION "Enable compilation of shaders to SPIR-V" OFF)
mark_as_advanced(SHADERS_ENABLE_COMPILATION)
if (SHADERS_ENABLE_COMPILATION AND GLSLC_PATH)
if(PLATFORM_WINDOWS)
set(SHADERTOOL_FILENAME "shadertool-windows.tar.gz")
elseif(PLATFORM_LINUX)
set(SHADERTOOL_FILENAME "shadertool-linux.tar.gz")
else()
# Platform not supported for compiling shaders
message("Found glslc program but platform has no shadertool binaries. Not doing shader compilation...")
return()
endif()
# The existence of glslc indicated whether we can compile our shaders or not
message(STATUS "Found glslc program. Shaders will be compiled during the build.")
set(SHADERTOOL_VERSION "v1.0")
set(SHADERTOOL_DIR "${CMAKE_CURRENT_BINARY_DIR}/shadertool/${SHADERTOOL_VERSION}")
# Download correct shadertool version if we do not have it already
if (NOT IS_DIRECTORY "${SHADERTOOL_DIR}")
set(DOWNLOAD_URL "https://github.com/scp-fs2open/fso-shadertool/releases/download/${SHADERTOOL_VERSION}/${SHADERTOOL_FILENAME}")
set(DOWNLOAD_FILE "${CMAKE_CURRENT_BINARY_DIR}/${SHADERTOOL_FILENAME}")
set(MAX_RETRIES 5)
foreach(i RANGE 1 ${MAX_RETRIES})
if (NOT (i EQUAL 1))
message(STATUS "Retry after 5 seconds (attempt #${i}) ...")
execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep "5")
endif()
message(STATUS "Downloading shadertool binaries from \"${DOWNLOAD_URL}\" (try ${i}/${MAX_RETRIES})")
file(DOWNLOAD "${DOWNLOAD_URL}" "${DOWNLOAD_FILE}" SHOW_PROGRESS TLS_VERIFY ON STATUS DOWNLOAD_STATUS_LIST)
list(GET DOWNLOAD_STATUS_LIST 0 DOWNLOAD_STATUS)
list(GET DOWNLOAD_STATUS_LIST 1 DOWNLOAD_ERROR)
if (DOWNLOAD_STATUS EQUAL 0)
break()
endif()
message(STATUS "Download of shadertool binaries failed: ${DOWNLOAD_ERROR}!")
endforeach()
if (NOT (DOWNLOAD_STATUS EQUAL 0))
message(FATAL_ERROR "${MAX_RETRIES} download attempts failed!")
return()
endif()
# Make sure the directory exists
file(MAKE_DIRECTORY "${SHADERTOOL_DIR}")
# Extract the downloaded file
message(STATUS "Extracting shadertool package...")
execute_process(
COMMAND ${CMAKE_COMMAND} -E tar xzf "${DOWNLOAD_FILE}"
WORKING_DIRECTORY "${SHADERTOOL_DIR}"
RESULT_VARIABLE EXTRACT_RESULT
ERROR_VARIABLE ERROR_TEXT
)
if (NOT (EXTRACT_RESULT EQUAL 0))
message(FATAL_ERROR "Extracting shadertool binaries failed! Error message: ${ERROR_TEXT}")
return()
endif()
file(REMOVE "${DOWNLOAD_FILE}")
endif()
add_executable(glslc IMPORTED GLOBAL)
set_target_properties(glslc PROPERTIES IMPORTED_LOCATION "${GLSLC_PATH}")
# Just use CMake for finding the shadertool binaries to avoid platform specific code here
find_program(SHADERTOOL_PATH shadertool
PATHS "${SHADERTOOL_DIR}/bin"
NO_DEFAULT_PATH)
add_executable(shadertool IMPORTED GLOBAL)
set_target_properties(shadertool PROPERTIES IMPORTED_LOCATION "${SHADERTOOL_PATH}")
endif ()
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