/* DE1: $Id: rend_sky.h 1713 2004-05-31 15:04:44Z skyjake $
 * Copyright (C) 2003, 2004 Jaakko Keränen <jaakko.keranen@iki.fi>
 *
 * 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 2 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: http://www.opensource.org/
 */

/*
 * rend_sky.h: Sky Sphere and 3D Models
 */

#ifndef __DOOMSDAY_SKY_H__
#define __DOOMSDAY_SKY_H__

// Sky hemispheres.
#define SKYHEMI_UPPER		0x1
#define SKYHEMI_LOWER		0x2
#define SKYHEMI_JUST_CAP	0x4	   // Just draw the top or bottom cap.
#define SKYHEMI_FADEOUT_BG	0x8	   // Draw the fadeout bg when drawing the cap.

typedef struct {
	float           rgb[3];		   // The RGB values.
	short           set, use;	   // Is this set? Should be used?
	float           limit;		   // .3 by default.
} fadeout_t;

// Sky layer flags.
#define SLF_ENABLED		0x1		   // Layer enabled.
#define SLF_MASKED		0x2		   // Mask the layer texture.

typedef struct {
	int             flags;
	int             texture;	   // Not the OpenGL texture.
	float           offset;
	fadeout_t       fadeout;
} skylayer_t;

extern int      skyDetail, skyRows, simpleSky;
extern float    skyDist;
extern int      r_fullsky;

// Functions:
void            Rend_InitSky();
void            Rend_ShutdownSky();
void            Rend_SkyDetail(int quarterDivs, int rows);
void            Rend_SkyParams(int layer, int parm, float value);
void            Rend_RenderSky(int hemis);

#endif