Add support for OpenGL (3D graphics)

Packages describing “opengl” as local USE flag

Package“opengl” Flag Description
dev-cpp/eigenAdd test support for OpenGL
dev-games/myguiUse the opengl render subsystem. (cannot combine with ogre)
dev-python/PyQt5Build bindings for the QtOpenGL module
dev-python/PyQt6Build bindings for the QtOpenGL module
dev-python/QtPyPull in bindings for the QtOpenGL module
dev-qt/qtdeclarativeEnable OpenGL support
media-libs/gst-plugins-baseEnable OpenGL library and plugin via desktop OpenGL API
media-plugins/gst-plugins-gtkEnable gtkglsink OpenGL sink based on desktop OpenGL API
media-video/mpvEnable support for OpenGL-based video backends (Note: deprecated for X11, USE=egl provides the newer support for -gpu-api=opengl)
x11-misc/picomEnable features that require opengl (opengl backend, and opengl vsync methods)

All packages providing a “opengl” USE flag (112)