## Copyright 2021 Intel Corporation
## SPDX-License-Identifier: Apache-2.0

##
## Configure
##

if(NOT DEFINED DRACO_VERSION)
  set(DRACO_VERSION 1.5.7)
endif()

##
## Implementation
##

message(STATUS "Getting Draco ${DRACO_VERSION}...")

find_package(draco ${DRACO_VERSION} QUIET)

if(NOT "${draco_FOUND}")

  message(STATUS "Downloading draco ${DRACO_VERSION}...")

  include(FetchContent)

  set(_ARCHIVE_EXT "zip")

  # Hide advanced options from main CMake list
  mark_as_advanced(DRACO_FAST)
  mark_as_advanced(DRACO_GLTF_BITSTREAM)
  mark_as_advanced(DRACO_ANIMATION_ENCODING)
  mark_as_advanced(DRACO_BACKWARDS_COMPATIBILITY)
  mark_as_advanced(DRACO_DECODER_ATTRIBUTE_DEDUPLICATION)
  mark_as_advanced(DRACO_IE_COMPATIBLE)
  mark_as_advanced(DRACO_JS_GLUE)
  mark_as_advanced(DRACO_MAYA_PLUGIN)
  mark_as_advanced(DRACO_MESH_COMPRESSION)
  mark_as_advanced(DRACO_POINT_CLOUD_COMPRESSION)
  mark_as_advanced(DRACO_PREDICTIVE_EDGEBREAKER)
  mark_as_advanced(DRACO_STANDARD_EDGEBREAKER)
  mark_as_advanced(DRACO_TESTS)
  mark_as_advanced(DRACO_UNITY_PLUGIN)
  mark_as_advanced(DRACO_WASM)
  mark_as_advanced(DRACO_DEBUG_COMPILER_WARNINGS)
  mark_as_advanced(DRACO_DEBUG_GLTF_BITSTREAM)
  mark_as_advanced(DRACO_TRANSCODER_SUPPORTED)

  # draco needs to be built position independent to link with ospray_sg
  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
  set(DRACO_FAST ON)
  set(DRACO_GLTF_BITSTREAM ON)
  set(DRACO_ANIMATION_ENCODING ON)
  set(DRACO_JS_GLUE OFF)

  FetchContent_Declare(
    draco
    URL "https://github.com/google/draco/archive/refs/tags/${DRACO_VERSION}.${_ARCHIVE_EXT}"
  )
  ## Bypass FetchContent_MakeAvailable() shortcut to disable install
  FetchContent_GetProperties(draco)
  if(NOT draco_POPULATED)
    FetchContent_Populate(draco)
    ## the subdir will still be built since targets depend on it, but it won't be installed
    add_subdirectory(${draco_SOURCE_DIR} ${draco_BINARY_DIR} EXCLUDE_FROM_ALL)
  endif()

  ## On Windows, the target is always 'draco' regardless of whether it builds a static or a shared library.
  ## On non-Windows, both static AND shared libraries can be built, so we explicitly choose the static target.
  if(NOT MSVC)
    add_library(draco ALIAS draco_static)
  endif()

  unset(${_ARCHIVE_EXT})

endif()