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EngineFinder.cmake
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EngineFinder.cmake
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# {BEGIN_LICENSE}
#
# Copyright (c) Contributors to the Open 3D Engine Project.
# For complete copyright and license terms please see the LICENSE at the root of this distribution.
#
# SPDX-License-Identifier: Apache-2.0 OR MIT
#
#
# {END_LICENSE}
# This file is copied during engine registration. Edits to this file will be lost next
# time a registration happens.
include_guard()
# Read the engine name from the project_json file
file(READ ${CMAKE_CURRENT_LIST_DIR}/project.json project_json)
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${CMAKE_CURRENT_LIST_DIR}/project.json)
string(JSON LY_ENGINE_NAME_TO_USE ERROR_VARIABLE json_error GET ${project_json} engine)
if(json_error)
message(FATAL_ERROR "Unable to read key 'engine' from 'project.json', error: ${json_error}")
endif()
if(DEFINED ENV{USERPROFILE} AND EXISTS $ENV{USERPROFILE})
set(manifest_path $ENV{USERPROFILE}/.o3de/o3de_manifest.json) # Windows
else()
set(manifest_path $ENV{HOME}/.o3de/o3de_manifest.json) # Unix
endif()
# Read the ~/.o3de/o3de_manifest.json file and look through the 'engines_path' object.
# Find a key that matches LY_ENGINE_NAME_TO_USE and use that as the engine path.
if(EXISTS ${manifest_path})
file(READ ${manifest_path} manifest_json)
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${manifest_path})
string(JSON engines_path_count ERROR_VARIABLE json_error LENGTH ${manifest_json} engines_path)
if(json_error)
message(FATAL_ERROR "Unable to read key 'engines_path' from '${manifest_path}', error: ${json_error}")
endif()
string(JSON engines_path_type ERROR_VARIABLE json_error TYPE ${manifest_json} engines_path)
if(json_error OR NOT ${engines_path_type} STREQUAL "OBJECT")
message(FATAL_ERROR "Type of 'engines_path' in '${manifest_path}' is not a JSON Object, error: ${json_error}")
endif()
math(EXPR engines_path_count "${engines_path_count}-1")
foreach(engine_path_index RANGE ${engines_path_count})
string(JSON engine_name ERROR_VARIABLE json_error MEMBER ${manifest_json} engines_path ${engine_path_index})
if(json_error)
message(FATAL_ERROR "Unable to read 'engines_path/${engine_path_index}' from '${manifest_path}', error: ${json_error}")
endif()
if(LY_ENGINE_NAME_TO_USE STREQUAL engine_name)
string(JSON engine_path ERROR_VARIABLE json_error GET ${manifest_json} engines_path ${engine_name})
if(json_error)
message(FATAL_ERROR "Unable to read value from 'engines_path/${engine_name}', error: ${json_error}")
endif()
if(engine_path)
list(APPEND CMAKE_MODULE_PATH "${engine_path}/cmake")
break()
endif()
endif()
endforeach()
else()
# If the user is passing CMAKE_MODULE_PATH we assume thats where we will find the engine
if(NOT CMAKE_MODULE_PATH)
message(FATAL_ERROR "Engine registration is required before configuring a project. Please register an engine by running 'scripts/o3de register --this-engine'")
endif()
endif()