This code attempts not to dlopen anything if it can find the appropriate
winsys symbols in the global namespace. That's nice. However we normally
do dlopen(RTLD_LOCAL) when we open lib{GLX,EGL} so those symbols will
_not_ in fact be in the global namespace. The code also prefers checking
GLX to EGL, which means even if we initialize EGL through epoxy, and
even if we're using glvnd, we'll still dlopen libGL the first time we
hit epoxy_is_desktop_gl().
There's a couple of ways to skin this cat, let's take the easy one. If
either-but-not-both of the glx or egl handles in the global API state
are initialized, then we know we're already in one or the other. If
neither or both are initialized, then the current heuristic should work
fine.
Note that epoxy_is_desktop_gl() is only bothering to check for GLX to
work around PowerVR's broken GLES. One suspects a better way to do that
would be to check GL_VENDOR or GL_RENDERER and avoid probing the window
system at all.
Signed-off-by: Adam Jackson <ajax@redhat.com>
The EGL API update from d11104f2b5 introduced a dependency on the
EGL_CAST() macro, provided by an updated eglplatform.h. Given that we
don't provide eglplatform.h, add a fallback definition for if we're
building against Mesa 17.0.x or similar.
https://bugs.gentoo.org/show_bug.cgi?id=623926
glvnd has the rather nice property that GLX and (desktop) GL are
available in separate libraries. As an example this would allow an EGL
app to use desktop GL without any X11 libraries. Fix up our dlopens to
prefer the glvnd libraries if available and fall back to the old ABI if
not.
Signed-off-by: Adam Jackson <ajax@redhat.com>
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>
We can build Epoxy with different compilers on Linux, and they may not
support all the linker flags we wish to use, so we should check whether
or not they exist.
Related commit: b3b8bd9af7
Fix "epoxy_glx_version" to handle the case when GLX is not active on the display.
Patch is tweak from the original version posted by Tom Horsley
In order to properly depend on headers, both generated and provided, in
a separate directory, we need to refer to them using their path.
Generated headers already have their full path; for provided ones, we
can simply use the `files()` directive.
This change should allow using libepoxy as a Meson subproject.
Fixes: #115
Removing the files() statement allows us to not use source_root(), which
breaks using libepoxy as a sub-project.
Using the python3 module is better for Windows portability.
We have been building the shared library for Epoxy without the symbol
visibility flags for the compiler, which means we've been leaking
internal symbols all over the floor.
Fixes: #111
Using GCC is not a guarantee of also having access to the Linux linker;
just like we use specific linker flags on macOS, the symbolic and relro
linker flags are pretty much Linux specific.
Emmanuele Bassi
Emmanuele Bassi
Adam Jackson
Nigel Stewart
Daniel Stone
Tom Schoonjans
Joseph C, Hill
Thomas Petazzoni
Gianfranco Costamagna
Efraim Flashner
Andrei Fadeev