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/* $Id: VBoxOGL.h $ */
/** @file
* VBox 3D Support API
*/
/*
* Copyright (C) 2012-2024 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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, in version 3 of the
* License.
*
* This program 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 this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef VBOX_INCLUDED_VBoxOGL_h
#define VBOX_INCLUDED_VBoxOGL_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
/* GUI and VBox OpenGL code require scaling factor value to be stored in container
* of type of 'double'. Communication between them is done via Main. In the same time,
* currently, Main does not like type of 'double' to be used for an interface method parameter.
* An integer type should be used instead. This value is used in order to specify scaling factor in type
* of 'integer' units. It is assumed that GUI feeds Main with its internal scaling factor value
* (which is originally of type of 'double') multiplied by this constant and converted resulting
* value to type of 'uint32_t'. Then Main provides this data to OpenGL HGCM thread. Finally, VBox OpenGL
* code divides received scalar by this constant and converts result to type of 'double'.
* This constant can be increased (multiplied by 10^n) in order to get better precision
* for scaling factor manipulations. */
#define VBOX_OGL_SCALE_FACTOR_MULTIPLIER 10000.0
#endif /* !VBOX_INCLUDED_VBoxOGL_h */
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