mirror of https://code.videolan.org/videolan/vlc
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*****************************************************************************
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* vlc_viewpoint.h: viewpoint struct and helpers
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*****************************************************************************
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* Copyright (C) 2017 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_VIEWPOINT_H_
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#define VLC_VIEWPOINT_H_ 1
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#include <vlc_common.h>
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#include <math.h>
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/**
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* \file
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* Video and audio viewpoint struct and helpers
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*/
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#define FIELD_OF_VIEW_DEGREES_DEFAULT 80.f
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#define FIELD_OF_VIEW_DEGREES_MAX 150.f
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#define FIELD_OF_VIEW_DEGREES_MIN 20.f
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/**
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* Viewpoints
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*/
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struct vlc_viewpoint_t {
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float yaw; /* yaw in degrees */
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float pitch; /* pitch in degrees */
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float roll; /* roll in degrees */
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float fov; /* field of view in degrees */
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};
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static inline void vlc_viewpoint_init( vlc_viewpoint_t *p_vp )
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{
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p_vp->yaw = p_vp->pitch = p_vp->roll = 0.0f;
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p_vp->fov = FIELD_OF_VIEW_DEGREES_DEFAULT;
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}
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static inline void vlc_viewpoint_clip( vlc_viewpoint_t *p_vp )
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{
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p_vp->yaw = fmodf( p_vp->yaw, 360.f );
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p_vp->pitch = fmodf( p_vp->pitch, 360.f );
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p_vp->roll = fmodf( p_vp->roll, 360.f );
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p_vp->fov = VLC_CLIP( p_vp->fov, FIELD_OF_VIEW_DEGREES_MIN,
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FIELD_OF_VIEW_DEGREES_MAX );
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}
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/**
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* Generate the 4x4 transform matrix corresponding to a viewpoint
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*
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* Convert a vlc_viewpoint_t into a 4x4 transform matrix with a column-major
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* layout.
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*
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* \param vp a valid viewpoint object
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* \param matrix a 4x4-sized array which will contain the matrix data
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*/
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VLC_API
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void vlc_viewpoint_to_4x4( const vlc_viewpoint_t *vp, float *matrix );
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#endif /* VLC_VIEWPOINT_H_ */
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