eglnativefence.cpp

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/*
    SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include "eglnativefence.h"
#include "egldisplay.h"
 
#include <unistd.h>
 
namespace KWin
{
 
#ifndef EGL_ANDROID_native_fence_sync
#define EGL_SYNC_NATIVE_FENCE_ANDROID 0x3144
#define EGL_NO_NATIVE_FENCE_FD_ANDROID -1
#endif // EGL_ANDROID_native_fence_sync
 
EGLNativeFence::EGLNativeFence(EglDisplay *display)
    : EGLNativeFence(display, eglCreateSyncKHR(display->handle(), EGL_SYNC_NATIVE_FENCE_ANDROID, nullptr))
{
    if (m_sync != EGL_NO_SYNC_KHR) {
        // The native fence will get a valid sync file fd only after a flush.
        glFlush();
        m_fileDescriptor = FileDescriptor(eglDupNativeFenceFDANDROID(m_display->handle(), m_sync));
    }
}
 
EGLNativeFence::EGLNativeFence(EglDisplay *display, EGLSyncKHR sync)
    : m_sync(sync)
    , m_display(display)
{
}
 
EGLNativeFence::~EGLNativeFence()
{
    m_fileDescriptor.reset();
    if (m_sync != EGL_NO_SYNC_KHR) {
        eglDestroySyncKHR(m_display->handle(), m_sync);
    }
}
 
bool EGLNativeFence::isValid() const
{
    return m_sync != EGL_NO_SYNC_KHR && m_fileDescriptor.isValid();
}
 
const FileDescriptor &EGLNativeFence::fileDescriptor() const
{
    return m_fileDescriptor;
}
 
bool EGLNativeFence::waitSync() const
{
    return eglWaitSync(m_display->handle(), m_sync, 0) == EGL_TRUE;
}
 
EGLNativeFence EGLNativeFence::importFence(EglDisplay *display, FileDescriptor &&fd)
{
    EGLint attributes[] = {
        EGL_SYNC_NATIVE_FENCE_FD_ANDROID, fd.take(),
        EGL_NONE};
    return EGLNativeFence(display, eglCreateSyncKHR(display->handle(), EGL_SYNC_NATIVE_FENCE_ANDROID, attributes));
}
 
} // namespace KWin