void VL_ClearBuffer (unsigned buf, byte color)
{
VGAMAPMASK(15);
memset((byte *)buf,color,screensize);
}
void VL_ClearVideo (byte color)
{
VGAMAPMASK(15);
memset((byte *)(0xa000<<4),color,0x10000);
}
void DrawSky( void )
{
byte * src;
int dest;
// int plane;
int height;
// int height2;
int ang;
int angle;
int ofs;
angle=viewangle;
if ((fog==0) && (lightning==true))
shadingtable=colormap+((basemaxshade-6-lightninglevel)<<8);
else
shadingtable=colormap+(1<<12);
ofs=(((maxheight)-(player->z))>>3)+(centery*200/iGLOBAL_SCREENHEIGHT-((viewheight*200/iGLOBAL_SCREENHEIGHT)>>1));
if (ofs>centerskypost)
{
ofs=centerskypost;
}
else if (((centerskypost-ofs)+viewheight*200/iGLOBAL_SCREENHEIGHT)>1799)
{
ofs=-(1799-(centerskypost+viewheight*200/iGLOBAL_SCREENHEIGHT));
}
//ofs=centerskypost;
#ifdef DOS
if (doublestep>0)
{
#ifdef DOS
for (plane=0;plane<4;plane+=2)
#endif
{
#ifdef DOS
VGAMAPMASK((1<<plane)+(1<<(plane+1)));
for (dest=plane;dest<viewwidth;dest+=4)
#else
for (dest=0;dest<viewwidth;dest+=2)
#endif
{
height=posts[dest].ceilingclip;
height2=posts[dest+1].ceilingclip;
if (height<height2)
height=height2;
if (height<=0)
continue;
ang=(angle+pixelangle[dest])&(FINEANGLES-1);
src=skysegs[ang]-ofs;
#ifdef DOS
DrawSkyPost((byte *)bufferofs + (dest>>2),src,height);
#else
/* TODO: this isn't right since it's not really optimized */
DrawSkyPost((byte *)bufferofs + dest,src,height);
DrawSkyPost((byte *)bufferofs + dest + 1,src,height);
#endif
}
}
}
else
#endif
{
#ifdef DOS
for (plane=0;plane<4;plane++)