kwin/plugins/screencast/eglnativefence.h
Vlad Zahorodnii 6b2e6cfd53 Prevent EGL headers from including Xlib headers
One of the annoying things about EGL headers is that they include
platform headers by default, e.g. on X11, it's Xlib.h, etc.

The problem with Xlib.h is that it uses the define compiler directive to
declare constants and those constants have very generic names, e.g.
'None', which typically conflict with enums, etc.

In order to work around bad things coming from Xlib.h, we include
fixx11.h file that contains some workarounds to redefine some Xlib's
types.

There's a flag or rather two flags (EGL_NO_PLATFORM_SPECIFIC_TYPES and
EGL_NO_X11) that are cross-vendor and they can be used to prevent EGL
headers from including platform specific headers, such as Xlib.h [1]

The benefit of setting those two flags is that you can simply include
EGL/egl.h or epoxy/egl.h and the world won't explode due to Xlib.h

MESA_EGL_NO_X11_HEADERS is set to support older versions of Mesa.

[1] https://github.com/KhronosGroup/EGL-Registry/pull/111
2020-12-10 11:15:06 +02:00

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/*
SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
#include <QtGlobal>
#include <epoxy/egl.h>
namespace KWin
{
class EGLNativeFence
{
public:
explicit EGLNativeFence(EGLDisplay display);
~EGLNativeFence();
bool isValid() const;
int fileDescriptor() const;
private:
EGLSyncKHR m_sync = EGL_NO_SYNC_KHR;
EGLDisplay m_display = EGL_NO_DISPLAY;
int m_fileDescriptor = -1;
Q_DISABLE_COPY(EGLNativeFence)
};
} // namespace KWin