sync.hpp

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#pragma once

#include <gls/headercheck.hpp>
#include <gls/errorcheck.hpp>
#include <gls/objects/object.hpp>

namespace gls {

class sync {
public:
    sync() :
        m_sync( 0 )
    {
    }

    ~sync() {
        check_gl_error( glDeleteSync( m_sync ) );
    }

    sync( sync&& other ) :
        m_sync( 0 )
    {
        std::swap( m_sync, other.m_sync );
    }

    sync& operator=( sync&& other ) {
        std::swap( m_sync, other.m_sync );
        return *this;
    }

    sync( const sync& ) = delete;
    operator=( const sync& ) = delete;

    GLsync name() const {
        return m_sync;
    }

    void insert() {
        check_gl_error( glDeleteSync( m_sync ) );
        m_sync = check_gl_error( glFenceSync( GL_SYNC_GPU_COMMANDS_COMPLETE, 0 ) );
    }

    bool wait( GLuint64 timeout ) {
        auto result = check_gl_error( glClientWaitSync( m_sync, GL_SYNC_FLUSH_COMMANDS_BIT, timeout ) );

        auto signaled = ( ( result == GL_ALREADY_SIGNALED ) || ( result == GL_CONDITION_SATISFIED ) );

        return signaled;
    }

    bool expired() {
        return wait( 0 );
    }

    void server_wait() {
        check_gl_error( glFlush() );
        check_gl_error( glWaitSync( m_sync, 0, GL_TIMEOUT_IGNORED ) );
    }

private:
    GLsync m_sync;
};

}