VulkanCodegen.cmake

# Shaders processing
if(NOT USE_VULKAN)
  return()
endif()

set(VULKAN_GEN_OUTPUT_PATH "${CMAKE_BINARY_DIR}/vulkan/ATen/native/vulkan")
set(VULKAN_GEN_ARG_ENV "")

if(USE_VULKAN_RELAXED_PRECISION)
  string(APPEND VULKAN_GEN_ARG_ENV "precision=mediump")
endif()

if(USE_VULKAN_SHADERC_RUNTIME)
  set(PYTHONPATH "$ENV{PYTHONPATH}")
  set(ENV{PYTHONPATH} "$ENV{PYTHONPATH}:${CMAKE_CURRENT_LIST_DIR}/..")
  execute_process(
    COMMAND
    "${PYTHON_EXECUTABLE}"
    ${CMAKE_CURRENT_LIST_DIR}/../aten/src/ATen/gen_vulkan_glsl.py
    --glsl-path ${CMAKE_CURRENT_LIST_DIR}/../aten/src/ATen/native/vulkan/glsl
    --output-path ${VULKAN_GEN_OUTPUT_PATH}
    --tmp-dir-path=${CMAKE_BINARY_DIR}/vulkan/glsl
    --env ${VULKAN_GEN_ARG_ENV}
    RESULT_VARIABLE error_code)
  set(ENV{PYTHONPATH} "$PYTHONPATH")

  if(error_code)
    message(FATAL_ERROR "Failed to gen glsl.h and glsl.cpp with shaders sources for Vulkan backend")
  endif()

  set(vulkan_generated_cpp ${VULKAN_GEN_OUTPUT_PATH}/glsl.cpp)
  return()
endif()

if(NOT USE_VULKAN_SHADERC_RUNTIME)
  # Precompiling shaders
  if(ANDROID)
    if(NOT ANDROID_NDK)
      message(FATAL_ERROR "ANDROID_NDK not set")
    endif()

    set(GLSLC_PATH "${ANDROID_NDK}/shader-tools/${ANDROID_NDK_HOST_SYSTEM_NAME}/glslc")
  else()
    find_program(
      GLSLC_PATH glslc
      PATHS
      ENV VULKAN_SDK
      PATHS "$ENV{VULKAN_SDK}/${CMAKE_HOST_SYSTEM_PROCESSOR}/bin")

    if(NOT GLSLC_PATH)
      message(FATAL_ERROR "USE_VULKAN glslc not found")
    endif(GLSLC_PATH)
  endif()

  set(PYTHONPATH "$ENV{PYTHONPATH}")
  set(ENV{PYTHONPATH} "$ENV{PYTHONPATH}:${CMAKE_CURRENT_LIST_DIR}/..")
  execute_process(
    COMMAND
    "${PYTHON_EXECUTABLE}"
    ${CMAKE_CURRENT_LIST_DIR}/../aten/src/ATen/gen_vulkan_spv.py
    --glsl-path ${CMAKE_CURRENT_LIST_DIR}/../aten/src/ATen/native/vulkan/glsl
    --output-path ${VULKAN_GEN_OUTPUT_PATH}
    --glslc-path=${GLSLC_PATH}
    --tmp-dir-path=${CMAKE_BINARY_DIR}/vulkan/spv
    --env ${VULKAN_GEN_ARG_ENV}
    RESULT_VARIABLE error_code)
  set(ENV{PYTHONPATH} "$PYTHONPATH")

    if(error_code)
      message(FATAL_ERROR "Failed to gen spv.h and spv.cpp with precompiled shaders for Vulkan backend")
    endif()

  set(vulkan_generated_cpp ${VULKAN_GEN_OUTPUT_PATH}/spv.cpp)
endif()