FindOpenGL

FindModule for OpenGL and GLU.

Optional COMPONENTS

This module respects several optional COMPONENTS: EGL, GLX, and OpenGL. There are corresponding import targets for each of these flags.

IMPORTED Targets

This module defines the IMPORTED targets:

OpenGL::GL

Defined to the platform-specific OpenGL libraries if the system has OpenGL.

OpenGL::OpenGL

Defined to libOpenGL if the system is GLVND-based. OpenGL::GL

OpenGL::GLU

Defined if the system has GLU.

OpenGL::GLX

Defined if the system has GLX.

OpenGL::EGL

Defined if the system has EGL.

Result Variables

This module sets the following variables:

OPENGL_FOUND

True, if the system has OpenGL and all components are found.

OPENGL_XMESA_FOUND

True, if the system has XMESA.

OPENGL_GLU_FOUND

True, if the system has GLU.

OpenGL_OpenGL_FOUND

True, if the system has an OpenGL library.

OpenGL_GLX_FOUND

True, if the system has GLX.

OpenGL_EGL_FOUND

True, if the system has EGL.

OPENGL_INCLUDE_DIR

Path to the OpenGL include directory.

OPENGL_EGL_INCLUDE_DIRS

Path to the EGL include directory.

OPENGL_LIBRARIES

Paths to the OpenGL library, windowing system libraries, and GLU libraries. On Linux, this assumes GLX and is never correct for EGL-based targets. Clients are encouraged to use the OpenGL::* import targets instead.

Cache variables

The following cache variables may also be set:

OPENGL_egl_LIBRARY

Path to the EGL library.

OPENGL_glu_LIBRARY

Path to the GLU library.

OPENGL_glx_LIBRARY

Path to the GLVND ‘GLX’ library.

OPENGL_opengl_LIBRARY

Path to the GLVND ‘OpenGL’ library

OPENGL_gl_LIBRARY

Path to the OpenGL library. New code should prefer the OpenGL::* import targets.

Linux-specific

Some Linux systems utilize GLVND as a new ABI for OpenGL. GLVND separates context libraries from OpenGL itself; OpenGL lives in “libOpenGL”, and contexts are defined in “libGLX” or “libEGL”. GLVND is currently the only way to get OpenGL 3+ functionality via EGL in a manner portable across vendors. Projects may use GLVND explicitly with target OpenGL::OpenGL and either OpenGL::GLX or OpenGL::EGL.

Projects may use the OpenGL::GL target (or OPENGL_LIBRARIES variable) to use legacy GL. By default, these will use the legacy libGL library file. If OPENGL_gl_LIBRARY is empty or not found and GLVND is available, the OpenGL::GL target will use GLVND OpenGL::OpenGL and OpenGL::GLX (and the OPENGL_LIBRARIES variable will use the corresponding libraries). Thus, for non-EGL-based Linux targets, the OpenGL::GL target is most portable.

For EGL targets the client must rely on GLVND support on the user’s system. Linking should use the OpenGL::OpenGL OpenGL::EGL targets. Using GLES* libraries is theoretically possible in place of OpenGL::OpenGL, but this module does not currently support that; contributions welcome.

OPENGL_egl_LIBRARY and OPENGL_EGL_INCLUDE_DIRS are defined in the case of GLVND. For non-GLVND Linux and other systems these are left undefined.

macOS-Specific

On OSX FindOpenGL defaults to using the framework version of OpenGL. People will have to change the cache values of OPENGL_glu_LIBRARY and OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX.