//-----------------------------------------------------------------------------
//
// Copyright 1993-1996 id Software
// Copyright 1999-2016 Randy Heit
// Copyright 2002-2016 Christoph Oelckers
//
// 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, either version 3 of the License, or
// (at your option) any later version.
//
// 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 http://www.gnu.org/licenses/
//
//-----------------------------------------------------------------------------
//

// DESCRIPTION:
//		Sky rendering.
//
//-----------------------------------------------------------------------------

#ifndef __R_SKY_H__
#define __R_SKY_H__

#include "textures/textures.h"

extern FTextureID	skyflatnum;
extern fixed_t		sky1cyl,		sky2cyl;
extern FTextureID	sky1texture,	sky2texture;
extern double		sky1pos,		sky2pos;
extern float		hw_sky1pos, hw_sky2pos;
extern double	skytexturemid;
extern float	skyiscale;
extern double	skyscale;
extern bool		skystretch;
extern int		freelookviewheight;

#define SKYSTRETCH_HEIGHT 228

// Called whenever the sky changes.
void R_InitSkyMap		();
void R_UpdateSky (uint64_t mstime);

// 57 world units roughly represent one sky texel for the glTranslate call.
enum
{
	skyoffsetfactor = 57
};


#endif //__R_SKY_H__