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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindOpenAL
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----------
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Finds Open Audio Library (OpenAL).
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Projects using this module should use ``#include "al.h"`` to include the OpenAL
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header file, **not** ``#include <AL/al.h>``. The reason for this is that the
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latter is not entirely portable. Windows/Creative Labs does not by default put
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their headers in ``AL/`` and macOS uses the convention ``<OpenAL/al.h>``.
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Hints
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^^^^^
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Environment variable ``$OPENALDIR`` can be used to set the prefix of OpenAL
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installation to be found.
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By default on macOS, system framework is search first. In other words,
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OpenAL is searched in the following order:
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1. System framework: ``/System/Library/Frameworks``, whose priority can be
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changed via setting the :variable:`CMAKE_FIND_FRAMEWORK` variable.
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2. Environment variable ``$OPENALDIR``.
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3. System paths.
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4. User-compiled framework: ``~/Library/Frameworks``.
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5. Manually compiled framework: ``/Library/Frameworks``.
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6. Add-on package: ``/opt``.
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Result Variables
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^^^^^^^^^^^^^^^^
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This module defines the following variables:
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``OPENAL_FOUND``
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If false, do not try to link to OpenAL
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``OPENAL_INCLUDE_DIR``
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OpenAL include directory
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``OPENAL_LIBRARY``
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Path to the OpenAL library
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``OPENAL_VERSION_STRING``
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Human-readable string containing the version of OpenAL
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#]=======================================================================]
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# For Windows, Creative Labs seems to have added a registry key for their
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# OpenAL 1.1 installer. I have added that key to the list of search paths,
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# however, the key looks like it could be a little fragile depending on
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# if they decide to change the 1.00.0000 number for bug fix releases.
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# Also, they seem to have laid down groundwork for multiple library platforms
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# which puts the library in an extra subdirectory. Currently there is only
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# Win32 and I have hardcoded that here. This may need to be adjusted as
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# platforms are introduced.
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# The OpenAL 1.0 installer doesn't seem to have a useful key I can use.
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# I do not know if the Nvidia OpenAL SDK has a registry key.
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find_path(OPENAL_INCLUDE_DIR al.h
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HINTS
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ENV OPENALDIR
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PATHS
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~/Library/Frameworks
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/Library/Frameworks
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/opt
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[HKEY_LOCAL_MACHINE\\SOFTWARE\\Creative\ Labs\\OpenAL\ 1.1\ Software\ Development\ Kit\\1.00.0000;InstallDir]
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PATH_SUFFIXES include/AL include/OpenAL include AL OpenAL
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)
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if(CMAKE_SIZEOF_VOID_P EQUAL 8)
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set(_OpenAL_ARCH_DIR libs/Win64)
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else()
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set(_OpenAL_ARCH_DIR libs/Win32)
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endif()
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find_library(OPENAL_LIBRARY
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NAMES OpenAL al openal OpenAL32
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HINTS
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ENV OPENALDIR
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PATHS
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~/Library/Frameworks
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/Library/Frameworks
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/opt
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[HKEY_LOCAL_MACHINE\\SOFTWARE\\Creative\ Labs\\OpenAL\ 1.1\ Software\ Development\ Kit\\1.00.0000;InstallDir]
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PATH_SUFFIXES libx32 lib64 lib libs64 libs ${_OpenAL_ARCH_DIR}
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)
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unset(_OpenAL_ARCH_DIR)
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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find_package_handle_standard_args(
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OpenAL
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REQUIRED_VARS OPENAL_LIBRARY OPENAL_INCLUDE_DIR
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VERSION_VAR OPENAL_VERSION_STRING
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)
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mark_as_advanced(OPENAL_LIBRARY OPENAL_INCLUDE_DIR)
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