mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-12-20 18:01:04 +00:00
80 lines
2 KiB
C
80 lines
2 KiB
C
// SONIC ROBO BLAST 2
|
|
//-----------------------------------------------------------------------------
|
|
// Copyright (C) 1993-1996 by id Software, Inc.
|
|
// Copyright (C) 1998-2000 by DooM Legacy Team.
|
|
// Copyright (C) 1999-2019 by Sonic Team Junior.
|
|
//
|
|
// This program is free software distributed under the
|
|
// terms of the GNU General Public License, version 2.
|
|
// See the 'LICENSE' file for more details.
|
|
//-----------------------------------------------------------------------------
|
|
/// \file r_sky.c
|
|
/// \brief Sky rendering
|
|
/// The SRB2 sky is a texture map like any
|
|
/// wall, wrapping around. A 1024 columns equal 360 degrees.
|
|
/// The default sky map is 256 columns and repeats 4 times
|
|
/// on a 320 screen.
|
|
|
|
#include "doomdef.h"
|
|
#include "doomstat.h"
|
|
#include "r_sky.h"
|
|
#include "r_local.h"
|
|
#include "w_wad.h"
|
|
#include "z_zone.h"
|
|
|
|
#include "p_maputl.h" // P_PointOnLineSide
|
|
|
|
//
|
|
// sky mapping
|
|
//
|
|
|
|
/** \brief Needed to store the number of the dummy sky flat.
|
|
Used for rendering, as well as tracking projectiles etc.
|
|
*/
|
|
INT32 skyflatnum;
|
|
|
|
/** \brief the lump number of the sky texture
|
|
*/
|
|
INT32 skytexture;
|
|
|
|
/** \brief the horizon line in a 256x128 sky texture
|
|
*/
|
|
INT32 skytexturemid;
|
|
|
|
/** \brief the scale of the sky
|
|
*/
|
|
fixed_t skyscale;
|
|
|
|
/** \brief used for keeping track of the current sky
|
|
*/
|
|
INT32 levelskynum;
|
|
INT32 globallevelskynum;
|
|
|
|
/** \brief The R_SetupSkyDraw function
|
|
|
|
Called at loadlevel after skytexture is set, or when sky texture changes.
|
|
|
|
\warning wallcolfunc should be set at R_ExecuteSetViewSize()
|
|
I don't bother because we don't use low detail anymore
|
|
|
|
\return void
|
|
*/
|
|
void R_SetupSkyDraw(void)
|
|
{
|
|
// the horizon line in a 256x128 sky texture
|
|
skytexturemid = (textures[skytexture]->height/2)<<FRACBITS;
|
|
|
|
R_SetSkyScale();
|
|
}
|
|
|
|
/** \brief The R_SetSkyScale function
|
|
|
|
set the correct scale for the sky at setviewsize
|
|
|
|
\return void
|
|
*/
|
|
void R_SetSkyScale(void)
|
|
{
|
|
fixed_t difference = vid.fdupx-(vid.dupx<<FRACBITS);
|
|
skyscale = FixedDiv(FRACUNIT, vid.fdupx+difference);
|
|
}
|