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518 lines
18 KiB
518 lines
18 KiB
# 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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# FindOpenGL
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# ----------
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#
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# FindModule for OpenGL and GLU.
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#
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# Optional COMPONENTS
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# ^^^^^^^^^^^^^^^^^^^
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#
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# This module respects several optional COMPONENTS: ``EGL``, ``GLX``, and
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# ``OpenGL``. There are corresponding import targets for each of these flags.
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#
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# IMPORTED Targets
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# ^^^^^^^^^^^^^^^^
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#
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# This module defines the :prop_tgt:`IMPORTED` targets:
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#
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# ``OpenGL::GL``
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# Defined to the platform-specific OpenGL libraries if the system has OpenGL.
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# ``OpenGL::OpenGL``
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# Defined to libOpenGL if the system is GLVND-based.
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# ``OpenGL::GL``
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# ``OpenGL::GLU``
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# Defined if the system has GLU.
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# ``OpenGL::GLX``
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# Defined if the system has GLX.
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# ``OpenGL::EGL``
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# Defined if the system has EGL.
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#
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# Result Variables
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# ^^^^^^^^^^^^^^^^
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#
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# This module sets the following variables:
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#
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# ``OPENGL_FOUND``
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# True, if the system has OpenGL and all components are found.
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# ``OPENGL_XMESA_FOUND``
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# True, if the system has XMESA.
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# ``OPENGL_GLU_FOUND``
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# True, if the system has GLU.
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# ``OpenGL_OpenGL_FOUND``
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# True, if the system has an OpenGL library.
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# ``OpenGL_GLX_FOUND``
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# True, if the system has GLX.
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# ``OpenGL_EGL_FOUND``
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# True, if the system has EGL.
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# ``OPENGL_INCLUDE_DIR``
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# Path to the OpenGL include directory.
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# ``OPENGL_EGL_INCLUDE_DIRS``
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# Path to the EGL include directory.
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# ``OPENGL_LIBRARIES``
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# Paths to the OpenGL library, windowing system libraries, and GLU libraries.
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# On Linux, this assumes GLX and is never correct for EGL-based targets.
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# Clients are encouraged to use the ``OpenGL::*`` import targets instead.
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#
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# Cache variables
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# ^^^^^^^^^^^^^^^
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#
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# The following cache variables may also be set:
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#
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# ``OPENGL_egl_LIBRARY``
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# Path to the EGL library.
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# ``OPENGL_glu_LIBRARY``
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# Path to the GLU library.
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# ``OPENGL_glx_LIBRARY``
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# Path to the GLVND 'GLX' library.
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# ``OPENGL_opengl_LIBRARY``
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# Path to the GLVND 'OpenGL' library
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# ``OPENGL_gl_LIBRARY``
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# Path to the OpenGL library. New code should prefer the ``OpenGL::*`` import
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# targets.
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#
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# Linux-specific
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# ^^^^^^^^^^^^^^
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#
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# Some Linux systems utilize GLVND as a new ABI for OpenGL. GLVND separates
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# context libraries from OpenGL itself; OpenGL lives in "libOpenGL", and
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# contexts are defined in "libGLX" or "libEGL". GLVND is currently the only way
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# to get OpenGL 3+ functionality via EGL in a manner portable across vendors.
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# Projects may use GLVND explicitly with target ``OpenGL::OpenGL`` and either
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# ``OpenGL::GLX`` or ``OpenGL::EGL``.
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#
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# Projects may use the ``OpenGL::GL`` target (or ``OPENGL_LIBRARIES`` variable)
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# to use legacy GL interfaces. These will use the legacy GL library located
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# by ``OPENGL_gl_LIBRARY``, if available. If ``OPENGL_gl_LIBRARY`` is empty or
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# not found and GLVND is available, the ``OpenGL::GL`` target will use GLVND
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# ``OpenGL::OpenGL`` and ``OpenGL::GLX`` (and the ``OPENGL_LIBRARIES``
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# variable will use the corresponding libraries). Thus, for non-EGL-based
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# Linux targets, the ``OpenGL::GL`` target is most portable.
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#
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# A ``OpenGL_GL_PREFERENCE`` variable may be set to specify the preferred way
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# to provide legacy GL interfaces in case multiple choices are available.
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# The value may be one of:
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#
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# ``GLVND``
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# If the GLVND OpenGL and GLX libraries are available, prefer them.
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# This forces ``OPENGL_gl_LIBRARY`` to be empty.
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# This is the default if components were requested (since components
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# correspond to GLVND libraries).
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#
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# ``LEGACY``
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# Prefer to use the legacy libGL library, if available.
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# This is the default if no components were requested.
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#
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# For EGL targets the client must rely on GLVND support on the user's system.
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# Linking should use the ``OpenGL::OpenGL OpenGL::EGL`` targets. Using GLES*
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# libraries is theoretically possible in place of ``OpenGL::OpenGL``, but this
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# module does not currently support that; contributions welcome.
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#
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# ``OPENGL_egl_LIBRARY`` and ``OPENGL_EGL_INCLUDE_DIRS`` are defined in the case of
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# GLVND. For non-GLVND Linux and other systems these are left undefined.
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#
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# macOS-Specific
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# ^^^^^^^^^^^^^^
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#
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# On OSX FindOpenGL defaults to using the framework version of OpenGL. People
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# will have to change the cache values of OPENGL_glu_LIBRARY and
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# OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX.
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set(_OpenGL_REQUIRED_VARS OPENGL_gl_LIBRARY)
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# Provide OPENGL_USE_<C> variables for each component.
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foreach(component ${OpenGL_FIND_COMPONENTS})
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string(TOUPPER ${component} _COMPONENT)
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set(OPENGL_USE_${_COMPONENT} 1)
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endforeach()
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if (CYGWIN)
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find_path(OPENGL_INCLUDE_DIR GL/gl.h )
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
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find_library(OPENGL_gl_LIBRARY opengl32 )
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find_library(OPENGL_glu_LIBRARY glu32 )
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elseif (WIN32)
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if(BORLAND)
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set (OPENGL_gl_LIBRARY import32 CACHE STRING "OpenGL library for win32")
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set (OPENGL_glu_LIBRARY import32 CACHE STRING "GLU library for win32")
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else()
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set (OPENGL_gl_LIBRARY opengl32 CACHE STRING "OpenGL library for win32")
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set (OPENGL_glu_LIBRARY glu32 CACHE STRING "GLU library for win32")
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endif()
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elseif (APPLE)
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# The OpenGL.framework provides both gl and glu
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find_library(OPENGL_gl_LIBRARY OpenGL DOC "OpenGL library for OS X")
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find_library(OPENGL_glu_LIBRARY OpenGL DOC
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"GLU library for OS X (usually same as OpenGL library)")
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find_path(OPENGL_INCLUDE_DIR OpenGL/gl.h DOC "Include for OpenGL on OS X")
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
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else()
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if (CMAKE_SYSTEM_NAME MATCHES "HP-UX")
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# Handle HP-UX cases where we only want to find OpenGL in either hpux64
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# or hpux32 depending on if we're doing a 64 bit build.
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if(CMAKE_SIZEOF_VOID_P EQUAL 4)
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set(_OPENGL_LIB_PATH
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/opt/graphics/OpenGL/lib/hpux32/)
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else()
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set(_OPENGL_LIB_PATH
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/opt/graphics/OpenGL/lib/hpux64/
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/opt/graphics/OpenGL/lib/pa20_64)
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endif()
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elseif(CMAKE_SYSTEM_NAME STREQUAL Haiku)
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set(_OPENGL_LIB_PATH
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/boot/develop/lib/x86)
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set(_OPENGL_INCLUDE_PATH
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/boot/develop/headers/os/opengl)
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endif()
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# The first line below is to make sure that the proper headers
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# are used on a Linux machine with the NVidia drivers installed.
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# They replace Mesa with NVidia's own library but normally do not
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# install headers and that causes the linking to
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# fail since the compiler finds the Mesa headers but NVidia's library.
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# Make sure the NVIDIA directory comes BEFORE the others.
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# - Atanas Georgiev <atanas@cs.columbia.edu>
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find_path(OPENGL_INCLUDE_DIR GL/gl.h
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/usr/share/doc/NVIDIA_GLX-1.0/include
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/usr/openwin/share/include
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/opt/graphics/OpenGL/include /usr/X11R6/include
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${_OPENGL_INCLUDE_PATH}
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)
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find_path(OPENGL_GLX_INCLUDE_DIR GL/glx.h ${_OPENGL_INCLUDE_PATH})
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find_path(OPENGL_EGL_INCLUDE_DIR EGL/egl.h ${_OPENGL_INCLUDE_PATH})
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find_path(OPENGL_xmesa_INCLUDE_DIR GL/xmesa.h
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/usr/share/doc/NVIDIA_GLX-1.0/include
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/usr/openwin/share/include
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/opt/graphics/OpenGL/include /usr/X11R6/include
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)
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# Search for the GLVND libraries. We do this regardless of COMPONENTS; we'll
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# take into account the COMPONENTS logic later.
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find_library(OPENGL_opengl_LIBRARY
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NAMES OpenGL
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PATHS /usr/X11R6/lib
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${_OPENGL_LIB_PATH}
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)
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find_library(OPENGL_glx_LIBRARY
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NAMES GLX
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PATHS /usr/X11R6/lib
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${_OPENGL_LIB_PATH}
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)
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find_library(OPENGL_egl_LIBRARY
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NAMES EGL
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PATHS ${_OPENGL_LIB_PATH}
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)
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find_library(OPENGL_glu_LIBRARY
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NAMES GLU MesaGLU
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PATHS ${OPENGL_gl_LIBRARY}
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/opt/graphics/OpenGL/lib
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/usr/openwin/lib
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/usr/shlib /usr/X11R6/lib
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)
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if(NOT DEFINED OpenGL_GL_PREFERENCE)
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set(OpenGL_GL_PREFERENCE "")
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endif()
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if(NOT OpenGL_GL_PREFERENCE STREQUAL "")
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# A preference has been explicitly specified.
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if(NOT OpenGL_GL_PREFERENCE MATCHES "^(GLVND|LEGACY)$")
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message(FATAL_ERROR
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"OpenGL_GL_PREFERENCE value '${OpenGL_GL_PREFERENCE}' not recognized. "
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"Allowed values are 'GLVND' and 'LEGACY'."
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)
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endif()
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elseif(OpenGL_FIND_COMPONENTS)
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# No preference was explicitly specified, but the caller did request
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# at least one GLVND component. Prefer GLVND for legacy GL.
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set(OpenGL_GL_PREFERENCE "GLVND")
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else()
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# No preference was explicitly specified and no GLVND components were
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# requested. Prefer libGL for legacy GL.
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set(OpenGL_GL_PREFERENCE "LEGACY")
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endif()
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if("x${OpenGL_GL_PREFERENCE}x" STREQUAL "xGLVNDx" AND OPENGL_opengl_LIBRARY AND OPENGL_glx_LIBRARY)
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# We can provide legacy GL using GLVND libraries.
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# Do not use any legacy GL library.
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set(OPENGL_gl_LIBRARY "")
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else()
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# We cannot provide legacy GL using GLVND libraries.
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# Search for the legacy GL library.
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find_library(OPENGL_gl_LIBRARY
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NAMES GL MesaGL
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PATHS /opt/graphics/OpenGL/lib
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/usr/openwin/lib
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/usr/shlib /usr/X11R6/lib
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${_OPENGL_LIB_PATH}
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)
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endif()
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# FPHSA cannot handle "this OR that is required", so we conditionally set what
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# it must look for. First clear any previous config we might have done:
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set(_OpenGL_REQUIRED_VARS)
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# now we append the libraries as appropriate. The complicated logic
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# basically comes down to "use libOpenGL when we can, and add in specific
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# context mechanisms when requested, or we need them to preserve the previous
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# default where glx is always available."
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if((NOT OPENGL_USE_EGL AND
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NOT OPENGL_opengl_LIBRARY AND
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OPENGL_glx_LIBRARY AND
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NOT OPENGL_gl_LIBRARY) OR
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(NOT OPENGL_USE_EGL AND
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NOT OPENGL_glx_LIBRARY AND
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NOT OPENGL_gl_LIBRARY) OR
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(NOT OPENGL_USE_EGL AND
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OPENGL_opengl_LIBRARY AND
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OPENGL_glx_LIBRARY) OR
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( OPENGL_USE_EGL))
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_opengl_LIBRARY)
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endif()
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# GLVND GLX library. Preferred when available.
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if((NOT OPENGL_USE_OPENGL AND
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NOT OPENGL_USE_GLX AND
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NOT OPENGL_USE_EGL AND
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NOT OPENGL_glx_LIBRARY AND
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NOT OPENGL_gl_LIBRARY) OR
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( OPENGL_USE_GLX AND
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NOT OPENGL_USE_EGL AND
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NOT OPENGL_glx_LIBRARY AND
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NOT OPENGL_gl_LIBRARY) OR
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(NOT OPENGL_USE_EGL AND
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OPENGL_opengl_LIBRARY AND
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OPENGL_glx_LIBRARY) OR
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(OPENGL_USE_GLX AND OPENGL_USE_EGL))
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_glx_LIBRARY)
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endif()
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# GLVND EGL library.
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if(OPENGL_USE_EGL)
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_egl_LIBRARY)
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endif()
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# Old-style "libGL" library: used as a fallback when GLVND isn't available.
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if((NOT OPENGL_USE_EGL AND
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NOT OPENGL_opengl_LIBRARY AND
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OPENGL_glx_LIBRARY AND
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OPENGL_gl_LIBRARY) OR
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(NOT OPENGL_USE_EGL AND
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NOT OPENGL_glx_LIBRARY AND
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OPENGL_gl_LIBRARY))
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_gl_LIBRARY)
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endif()
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# We always need the 'gl.h' include dir.
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list(APPEND _OpenGL_REQUIRED_VARS OPENGL_INCLUDE_DIR)
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unset(_OPENGL_INCLUDE_PATH)
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unset(_OPENGL_LIB_PATH)
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find_library(OPENGL_glu_LIBRARY
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NAMES GLU MesaGLU
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PATHS ${OPENGL_gl_LIBRARY}
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/opt/graphics/OpenGL/lib
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/usr/openwin/lib
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/usr/shlib /usr/X11R6/lib
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)
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endif ()
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if(OPENGL_xmesa_INCLUDE_DIR)
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set( OPENGL_XMESA_FOUND "YES" )
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else()
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set( OPENGL_XMESA_FOUND "NO" )
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endif()
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if(OPENGL_glu_LIBRARY)
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set( OPENGL_GLU_FOUND "YES" )
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else()
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set( OPENGL_GLU_FOUND "NO" )
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endif()
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# OpenGL_OpenGL_FOUND is a bit unique in that it is okay if /either/ libOpenGL
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# or libGL is found.
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# Using libGL with libEGL is never okay, though; we handle that case later.
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if(NOT OPENGL_opengl_LIBRARY AND NOT OPENGL_gl_LIBRARY)
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set(OpenGL_OpenGL_FOUND FALSE)
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else()
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set(OpenGL_OpenGL_FOUND TRUE)
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endif()
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if(OPENGL_glx_LIBRARY AND OPENGL_GLX_INCLUDE_DIR)
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set(OpenGL_GLX_FOUND TRUE)
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else()
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set(OpenGL_GLX_FOUND FALSE)
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endif()
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if(OPENGL_egl_LIBRARY AND OPENGL_EGL_INCLUDE_DIR)
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set(OpenGL_EGL_FOUND TRUE)
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else()
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set(OpenGL_EGL_FOUND FALSE)
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endif()
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# User-visible names should be plural.
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if(OPENGL_EGL_INCLUDE_DIR)
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set(OPENGL_EGL_INCLUDE_DIRS ${OPENGL_EGL_INCLUDE_DIR})
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endif()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenGL REQUIRED_VARS ${_OpenGL_REQUIRED_VARS}
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HANDLE_COMPONENTS)
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unset(_OpenGL_REQUIRED_VARS)
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# OpenGL:: targets
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if(OPENGL_FOUND)
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# ::OpenGL is a GLVND library, and thus Linux-only: we don't bother checking
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# for a framework version of this library.
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if(OPENGL_opengl_LIBRARY AND NOT TARGET OpenGL::OpenGL)
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if(IS_ABSOLUTE "${OPENGL_opengl_LIBRARY}")
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add_library(OpenGL::OpenGL UNKNOWN IMPORTED)
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set_target_properties(OpenGL::OpenGL PROPERTIES IMPORTED_LOCATION
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"${OPENGL_opengl_LIBRARY}")
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else()
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add_library(OpenGL::OpenGL INTERFACE IMPORTED)
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set_target_properties(OpenGL::OpenGL PROPERTIES IMPORTED_LIBNAME
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"${OPENGL_opengl_LIBRARY}")
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endif()
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set_target_properties(OpenGL::OpenGL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
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"${OPENGL_INCLUDE_DIR}")
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endif()
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# ::GLX is a GLVND library, and thus Linux-only: we don't bother checking
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# for a framework version of this library.
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if(OpenGL_GLX_FOUND AND NOT TARGET OpenGL::GLX)
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if(IS_ABSOLUTE "${OPENGL_glx_LIBRARY}")
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add_library(OpenGL::GLX UNKNOWN IMPORTED)
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set_target_properties(OpenGL::GLX PROPERTIES IMPORTED_LOCATION
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"${OPENGL_glx_LIBRARY}")
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else()
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add_library(OpenGL::GLX INTERFACE IMPORTED)
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set_target_properties(OpenGL::GLX PROPERTIES IMPORTED_LIBNAME
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"${OPENGL_glx_LIBRARY}")
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endif()
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set_target_properties(OpenGL::GLX PROPERTIES INTERFACE_LINK_LIBRARIES
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OpenGL::OpenGL)
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set_target_properties(OpenGL::GLX PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
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"${OPENGL_GLX_INCLUDE_DIR}")
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endif()
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if(OPENGL_gl_LIBRARY AND NOT TARGET OpenGL::GL)
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# A legacy GL library is available, so use it for the legacy GL target.
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if(IS_ABSOLUTE "${OPENGL_gl_LIBRARY}")
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add_library(OpenGL::GL UNKNOWN IMPORTED)
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if(OPENGL_gl_LIBRARY MATCHES "/([^/]+)\\.framework$")
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set(_gl_fw "${OPENGL_gl_LIBRARY}/${CMAKE_MATCH_1}")
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if(EXISTS "${_gl_fw}.tbd")
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string(APPEND _gl_fw ".tbd")
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endif()
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set_target_properties(OpenGL::GL PROPERTIES
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IMPORTED_LOCATION "${_gl_fw}")
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else()
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set_target_properties(OpenGL::GL PROPERTIES
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IMPORTED_LOCATION "${OPENGL_gl_LIBRARY}")
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endif()
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else()
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add_library(OpenGL::GL INTERFACE IMPORTED)
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set_target_properties(OpenGL::GL PROPERTIES
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IMPORTED_LIBNAME "${OPENGL_gl_LIBRARY}")
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endif()
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set_target_properties(OpenGL::GL PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${OPENGL_INCLUDE_DIR}")
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elseif(NOT TARGET OpenGL::GL AND TARGET OpenGL::OpenGL AND TARGET OpenGL::GLX)
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# A legacy GL library is not available, but we can provide the legacy GL
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# target using GLVND OpenGL+GLX.
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add_library(OpenGL::GL INTERFACE IMPORTED)
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set_target_properties(OpenGL::GL PROPERTIES INTERFACE_LINK_LIBRARIES
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OpenGL::OpenGL)
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set_property(TARGET OpenGL::GL APPEND PROPERTY INTERFACE_LINK_LIBRARIES
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OpenGL::GLX)
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set_target_properties(OpenGL::GL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
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"${OPENGL_INCLUDE_DIR}")
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endif()
|
|
|
|
# ::EGL is a GLVND library, and thus Linux-only: we don't bother checking
|
|
# for a framework version of this library.
|
|
# Note we test for OpenGL::OpenGL as a target. When this module is updated to
|
|
# support GLES, we would additionally want to check for the hypothetical GLES
|
|
# target and enable EGL if either ::GLES or ::OpenGL is created.
|
|
if(TARGET OpenGL::OpenGL AND OpenGL_EGL_FOUND AND NOT TARGET OpenGL::EGL)
|
|
if(IS_ABSOLUTE "${OPENGL_egl_LIBRARY}")
|
|
add_library(OpenGL::EGL UNKNOWN IMPORTED)
|
|
set_target_properties(OpenGL::EGL PROPERTIES IMPORTED_LOCATION
|
|
"${OPENGL_egl_LIBRARY}")
|
|
else()
|
|
add_library(OpenGL::EGL INTERFACE IMPORTED)
|
|
set_target_properties(OpenGL::EGL PROPERTIES IMPORTED_LIBNAME
|
|
"${OPENGL_egl_LIBRARY}")
|
|
endif()
|
|
set_target_properties(OpenGL::EGL PROPERTIES INTERFACE_LINK_LIBRARIES
|
|
OpenGL::OpenGL)
|
|
# Note that EGL's include directory is different from OpenGL/GLX's!
|
|
set_target_properties(OpenGL::EGL PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
|
|
"${OPENGL_EGL_INCLUDE_DIR}")
|
|
endif()
|
|
|
|
if(OPENGL_GLU_FOUND AND NOT TARGET OpenGL::GLU)
|
|
if(IS_ABSOLUTE "${OPENGL_glu_LIBRARY}")
|
|
add_library(OpenGL::GLU UNKNOWN IMPORTED)
|
|
if(OPENGL_glu_LIBRARY MATCHES "/([^/]+)\\.framework$")
|
|
set(_glu_fw "${OPENGL_glu_LIBRARY}/${CMAKE_MATCH_1}")
|
|
if(EXISTS "${_glu_fw}.tbd")
|
|
string(APPEND _glu_fw ".tbd")
|
|
endif()
|
|
set_target_properties(OpenGL::GLU PROPERTIES
|
|
IMPORTED_LOCATION "${_glu_fw}")
|
|
else()
|
|
set_target_properties(OpenGL::GLU PROPERTIES
|
|
IMPORTED_LOCATION "${OPENGL_glu_LIBRARY}")
|
|
endif()
|
|
else()
|
|
add_library(OpenGL::GLU INTERFACE IMPORTED)
|
|
set_target_properties(OpenGL::GLU PROPERTIES
|
|
IMPORTED_LIBNAME "${OPENGL_glu_LIBRARY}")
|
|
endif()
|
|
set_target_properties(OpenGL::GLU PROPERTIES
|
|
INTERFACE_LINK_LIBRARIES OpenGL::GL)
|
|
endif()
|
|
|
|
# OPENGL_LIBRARIES mirrors OpenGL::GL's logic ...
|
|
if(OPENGL_gl_LIBRARY)
|
|
set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY})
|
|
elseif(TARGET OpenGL::OpenGL AND TARGET OpenGL::GLX)
|
|
set(OPENGL_LIBRARIES ${OPENGL_opengl_LIBRARY} ${OPENGL_glx_LIBRARY})
|
|
else()
|
|
set(OPENGL_LIBRARIES "")
|
|
endif()
|
|
# ... and also includes GLU, if available.
|
|
if(TARGET OpenGL::GLU)
|
|
list(APPEND OPENGL_LIBRARIES ${OPENGL_glu_LIBRARY})
|
|
endif()
|
|
endif()
|
|
|
|
# This deprecated setting is for backward compatibility with CMake1.4
|
|
set(OPENGL_LIBRARY ${OPENGL_LIBRARIES})
|
|
# This deprecated setting is for backward compatibility with CMake1.4
|
|
set(OPENGL_INCLUDE_PATH ${OPENGL_INCLUDE_DIR})
|
|
|
|
mark_as_advanced(
|
|
OPENGL_INCLUDE_DIR
|
|
OPENGL_xmesa_INCLUDE_DIR
|
|
OPENGL_egl_LIBRARY
|
|
OPENGL_glu_LIBRARY
|
|
OPENGL_glx_LIBRARY
|
|
OPENGL_gl_LIBRARY
|
|
OPENGL_opengl_LIBRARY
|
|
OPENGL_EGL_INCLUDE_DIR
|
|
OPENGL_GLX_INCLUDE_DIR
|
|
)
|