cpp/openttd-patchpack/source Files · src/progress.cpp

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Patric Stout

Remove: [Video] no longer draw in a thread

Drawing in a thread is a bit odd, and often leads to surprising
issues. For example, OpenGL would only allow it if you move the
full context to the thread. Which is not always easily done on
all OSes.
In general, the advise is to handle system events and drawing
from the main thread, and do everything else in other threads.
So, let's be more like other games.

Additionally, putting the drawing routine in a thread was only
done for a few targets.

Upcoming commit will move the GameLoop in a thread, which will
work for all targets.

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file progress.cpp Functions for modal progress windows. */

#include "stdafx.h"
#include "progress.h"

#include "safeguards.h"

/** Are we in a modal progress or not? */
bool _in_modal_progress = false;
bool _first_in_modal_loop = false;
/** Threading usable for modal progress? */
bool _use_threaded_modal_progress = true;
/** Rights for the performing work. */
std::mutex _modal_progress_work_mutex;
/** Rights for the painting. */
std::mutex _modal_progress_paint_mutex;

/**
 * Set the modal progress state.
 * @note Makes IsFirstModalProgressLoop return true for the next call.
 * @param state The new state; are we modal or not?
 */
void SetModalProgress(bool state)
{
	_in_modal_progress = state;
	_first_in_modal_loop = true;
}

/**
 * Check whether this is the first modal progress loop.
 * @note Set by SetModalProgress, unset by calling this method.
 * @return True if this is the first loop.
 */
bool IsFirstModalProgressLoop()
{
	bool ret = _first_in_modal_loop;
	_first_in_modal_loop = false;
	return ret;
}