The `enable-` prefix is an Autotool-ism; idiomatic naming for Meson
projects should just use the name of the option, and rely on the type
to convey meaning, especially because Meson does not have `disable`
aliases that avoid the explicit `enable-foo=no` cases.
Epoxy can be compiled with GLX and X11 native resources on EGL. We can
disable the former, but the latter is always built in when enabling EGL
support.
Some platforms do not support X11 at all, so we need a way to disable
X11 when configuring Epoxy.
It is perfectly possible to build Mesa3D with just OpenGL support, and
use with GLX in X.org, without having EGL/OpenGLES support.
However, libepoxy currently unconditionally requires EGL support in its
configure.ac, which causes a build failure when Mesa3D only provides
full OpenGL support:
checking for EGL... no
configure: error: Package requirements (egl) were not met:
Package egl was not found in the pkg-config search path.
Perhaps you should add the directory containing `egl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'egl', required by 'world', not found
This commit fixes that by:
- Adjusting the configure.ac to add a --{enable,disable}-egl option
handled in the exact same way as --{enable,disable}-glx
- Adjusting the meson build logic in the same way.
- Adjusting src/dispatch_common.h to define PLATFORM_HAS_EGL correctly,
which allows to not include any EGL related header file if EGL
support is not enabled.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Currently, GLX support in libepoxy at build time is hard coded, but
various platforms have expressed their preference for having a
configure-time option for it.
For instance:
- various embedded distributors do not ship with X11, but wish to use
libraries that depend on libepoxy now that Wayland is available
- distributors for macOS still wish to retain the ability to ship
their software with X11 enabled
By default, we want epoxy to build with GLX enabled pretty much
everywhere it makes sense, since it's only a build-time option and it's
not a run-time dependency.
The build is conditional on:
* using the Meson build
* passing the `-Denable-docs=true` configuration switch
* having `doxygen` installed
Currently, the generated HTML is kind of empty, but it works.
Ross Burton
Emmanuele Bassi
Thomas Petazzoni