| 1 | /* $Id: VBoxOGL.h 99941 2023-05-23 17:06:41Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBox 3D Support API
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| 4 | */
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| 5 | /*
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| 6 | * Copyright (C) 2012-2023 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.virtualbox.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef VBOX_INCLUDED_VBoxOGL_h
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| 37 | #define VBOX_INCLUDED_VBoxOGL_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | /* GUI and VBox OpenGL code require scaling factor value to be stored in container
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| 43 | * of type of 'double'. Communication between them is done via Main. In the same time,
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| 44 | * currently, Main does not like type of 'double' to be used for an interface method parameter.
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| 45 | * An integer type should be used instead. This value is used in order to specify scaling factor in type
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| 46 | * of 'integer' units. It is assumed that GUI feeds Main with its internal scaling factor value
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| 47 | * (which is originally of type of 'double') multiplied by this constant and converted resulting
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| 48 | * value to type of 'uint32_t'. Then Main provides this data to OpenGL HGCM thread. Finally, VBox OpenGL
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| 49 | * code divides received scalar by this constant and converts result to type of 'double'.
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| 50 | * This constant can be increased (multiplied by 10^n) in order to get better precision
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| 51 | * for scaling factor manipulations. */
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| 52 | #define VBOX_OGL_SCALE_FACTOR_MULTIPLIER 10000.0
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| 53 |
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| 54 | #endif /* !VBOX_INCLUDED_VBoxOGL_h */
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