Kart-Public/src/v_video.c

// SONIC ROBO BLAST 2
//-----------------------------------------------------------------------------
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 1998-2000 by DooM Legacy Team.
// Copyright (C) 1999-2016 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  v_video.c
/// \brief Gamma correction LUT stuff
///        Functions to draw patches (by post) directly to screen.
///        Functions to blit a block to the screen.

#include "doomdef.h"
#include "r_local.h"
#include "v_video.h"
#include "hu_stuff.h"
#include "r_draw.h"
#include "console.h"

#include "i_video.h" // rendermode
#include "z_zone.h"
#include "m_misc.h"
#include "m_random.h"
#include "doomstat.h"

#ifdef HWRENDER
#include "hardware/hw_glob.h"
#endif

// Each screen is [vid.width*vid.height];
UINT8 *screens[5];
// screens[0] = main display window
// screens[1] = back screen, alternative blitting
// screens[2] = screenshot buffer, gif movie buffer
// screens[3] = fade screen start
// screens[4] = fade screen end, postimage tempoarary buffer

static CV_PossibleValue_t gamma_cons_t[] = {{0, "MIN"}, {4, "MAX"}, {0, NULL}};
static void CV_usegamma_OnChange(void);

consvar_t cv_ticrate = {"showfps", "No", CV_SAVE, CV_YesNo, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_usegamma = {"gamma", "0", CV_SAVE|CV_CALL, gamma_cons_t, CV_usegamma_OnChange, 0, NULL, NULL, 0, 0, NULL};

consvar_t cv_allcaps = {"allcaps", "Off", 0, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};

static CV_PossibleValue_t constextsize_cons_t[] = {
	{V_NOSCALEPATCH, "Small"}, {V_SMALLSCALEPATCH, "Medium"}, {V_MEDSCALEPATCH, "Large"}, {0, "Huge"},
	{0, NULL}};
static void CV_constextsize_OnChange(void);
consvar_t cv_constextsize = {"con_textsize", "Medium", CV_SAVE|CV_CALL, constextsize_cons_t, CV_constextsize_OnChange, 0, NULL, NULL, 0, 0, NULL};

#ifdef HWRENDER
static void CV_Gammaxxx_ONChange(void);
// Saved hardware mode variables
// - You can change them in software,
// but they won't do anything.
static CV_PossibleValue_t grgamma_cons_t[] = {{1, "MIN"}, {255, "MAX"}, {0, NULL}};
static CV_PossibleValue_t grsoftwarefog_cons_t[] = {{0, "Off"}, {1, "On"}, {2, "LightPlanes"}, {0, NULL}};

consvar_t cv_voodoocompatibility = {"gr_voodoocompatibility", "Off", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grfovchange = {"gr_fovchange", "Off", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grfog = {"gr_fog", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grfogcolor = {"gr_fogcolor", "AAAAAA", CV_SAVE, NULL, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grsoftwarefog = {"gr_softwarefog", "Off", CV_SAVE, grsoftwarefog_cons_t, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grgammared = {"gr_gammared", "127", CV_SAVE|CV_CALL, grgamma_cons_t,
                           CV_Gammaxxx_ONChange, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grgammagreen = {"gr_gammagreen", "127", CV_SAVE|CV_CALL, grgamma_cons_t,
                             CV_Gammaxxx_ONChange, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grgammablue = {"gr_gammablue", "127", CV_SAVE|CV_CALL, grgamma_cons_t,
                            CV_Gammaxxx_ONChange, 0, NULL, NULL, 0, 0, NULL};
#ifdef ALAM_LIGHTING
consvar_t cv_grdynamiclighting = {"gr_dynamiclighting", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grstaticlighting  = {"gr_staticlighting", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grcoronas = {"gr_coronas", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
consvar_t cv_grcoronasize = {"gr_coronasize", "1", CV_SAVE| CV_FLOAT, 0, NULL, 0, NULL, NULL, 0, 0, NULL};
#endif

static CV_PossibleValue_t CV_MD2[] = {{0, "Off"}, {1, "On"}, {2, "Old"}, {0, NULL}};
// console variables in development
consvar_t cv_grmd2 = {"gr_md2", "Off", CV_SAVE, CV_MD2, NULL, 0, NULL, NULL, 0, 0, NULL};
#endif

const UINT8 gammatable[5][256] =
{
	{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
	17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
	33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
	49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
	65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
	81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,
	97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,
	113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
	128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
	144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
	160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
	176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
	192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
	208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
	224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
	240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},

	{2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,
	32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,
	56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,
	78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
	99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
	115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,
	130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,
	146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,
	161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,
	175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,
	190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,
	205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,
	219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,
	233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,
	247,248,249,250,251,252,252,253,254,255},

	{4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,
	43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,
	70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,
	94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,
	113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
	129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,
	144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,
	160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,
	174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,
	188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,
	202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,
	216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,
	229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,
	242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,
	255},

	{8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,
	57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,
	86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,
	108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,
	125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,
	141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,
	155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,
	169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,
	183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,
	195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,
	207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,
	219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,
	231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,
	242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,
	253,253,254,254,255},

	{16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,
	78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,
	107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,
	125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,
	142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,
	156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,
	169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,
	182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,
	193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,
	204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,
	214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,
	224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,
	234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,
	243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,
	251,252,252,253,254,254,255,255}
};

// local copy of the palette for V_GetColor()
RGBA_t *pLocalPalette = NULL;

// keep a copy of the palette so that we can get the RGB value for a color index at any time.
static void LoadPalette(const char *lumpname)
{
	const UINT8 *usegamma = gammatable[cv_usegamma.value];
	lumpnum_t lumpnum = W_GetNumForName(lumpname);
	size_t i, palsize = W_LumpLength(lumpnum)/3;
	UINT8 *pal;

	Z_Free(pLocalPalette);

	pLocalPalette = Z_Malloc(sizeof (*pLocalPalette)*palsize, PU_STATIC, NULL);

	pal = W_CacheLumpNum(lumpnum, PU_CACHE);
	for (i = 0; i < palsize; i++)
	{
		pLocalPalette[i].s.red = usegamma[*pal++];
		pLocalPalette[i].s.green = usegamma[*pal++];
		pLocalPalette[i].s.blue = usegamma[*pal++];
		pLocalPalette[i].s.alpha = 0xFF;
	}
}

const char *R_GetPalname(UINT16 num)
{
	static char palname[9];
	char newpal[9] = "PLAYPAL";

	if (num > 0 && num <= 10000)
		snprintf(newpal, 8, "PAL%04u", num-1);

	strncpy(palname, newpal, 8);
	return palname;
}

const char *GetPalette(void)
{
	if (gamestate == GS_LEVEL)
		return R_GetPalname(mapheaderinfo[gamemap-1]->palette);
	return "PLAYPAL";
}

static void LoadMapPalette(void)
{
	LoadPalette(GetPalette());
}

// -------------+
// V_SetPalette : Set the current palette to use for palettized graphics
//              :
// -------------+
void V_SetPalette(INT32 palettenum)
{
	if (!pLocalPalette)
		LoadMapPalette();

#ifdef HWRENDER
	if (rendermode != render_soft && rendermode != render_none)
		HWR_SetPalette(&pLocalPalette[palettenum*256]);
#if (defined (__unix__) && !defined (MSDOS)) || defined (UNIXCOMMON) || defined (HAVE_SDL)
	else
#endif
#endif
	if (rendermode != render_none)
		I_SetPalette(&pLocalPalette[palettenum*256]);
}

void V_SetPaletteLump(const char *pal)
{
	LoadPalette(pal);
#ifdef HWRENDER
	if (rendermode != render_soft && rendermode != render_none)
		HWR_SetPalette(pLocalPalette);
#if (defined (__unix__) && !defined (MSDOS)) || defined (UNIXCOMMON) || defined (HAVE_SDL)
	else
#endif
#endif
	if (rendermode != render_none)
		I_SetPalette(pLocalPalette);
}

static void CV_usegamma_OnChange(void)
{
	// reload palette
	LoadMapPalette();
	V_SetPalette(0);
}

// change the palette directly to see the change
#ifdef HWRENDER
static void CV_Gammaxxx_ONChange(void)
{
	if (rendermode != render_soft && rendermode != render_none)
		V_SetPalette(0);
}
#endif


#if defined (__GNUC__) && defined (__i386__) && !defined (NOASM) && !defined (__APPLE__) && !defined (NORUSEASM)
void VID_BlitLinearScreen_ASM(const UINT8 *srcptr, UINT8 *destptr, INT32 width, INT32 height, size_t srcrowbytes,
	size_t destrowbytes);
#define HAVE_VIDCOPY
#endif

static void CV_constextsize_OnChange(void)
{
	con_recalc = true;
}


// --------------------------------------------------------------------------
// Copy a rectangular area from one bitmap to another (8bpp)
// --------------------------------------------------------------------------
void VID_BlitLinearScreen(const UINT8 *srcptr, UINT8 *destptr, INT32 width, INT32 height, size_t srcrowbytes,
	size_t destrowbytes)
{
#ifdef HAVE_VIDCOPY
    VID_BlitLinearScreen_ASM(srcptr,destptr,width,height,srcrowbytes,destrowbytes);
#else
	if (srcrowbytes == destrowbytes)
		M_Memcpy(destptr, srcptr, srcrowbytes * height);
	else
	{
		while (height--)
		{
			M_Memcpy(destptr, srcptr, width);

			destptr += destrowbytes;
			srcptr += srcrowbytes;
		}
	}
#endif
}

//static UINT8 hudplusalpha[11]  = { 10,  8,  6,  4,  2,  0,  0,  0,  0,  0,  0};
static UINT8 hudminusalpha[11] = { 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5};
UINT8 hudtrans = 0;

static const UINT8 *v_colormap = NULL;
static const UINT8 *v_translevel = NULL;

static inline UINT8 standardpdraw(const UINT8 *dest, const UINT8 *source, fixed_t ofs)
{
	(void)dest; return source[ofs>>FRACBITS];
}
static inline UINT8 mappedpdraw(const UINT8 *dest, const UINT8 *source, fixed_t ofs)
{
	(void)dest; return *(v_colormap + source[ofs>>FRACBITS]);
}
static inline UINT8 translucentpdraw(const UINT8 *dest, const UINT8 *source, fixed_t ofs)
{
	return *(v_translevel + ((source[ofs>>FRACBITS]<<8)&0xff00) + (*dest&0xff));
}
static inline UINT8 transmappedpdraw(const UINT8 *dest, const UINT8 *source, fixed_t ofs)
{
	return *(v_translevel + (((*(v_colormap + source[ofs>>FRACBITS]))<<8)&0xff00) + (*dest&0xff));
}

// Draws a patch scaled to arbitrary size.
void V_DrawFixedPatch(fixed_t x, fixed_t y, fixed_t pscale, INT32 scrn, patch_t *patch, const UINT8 *colormap)
{
	UINT8 (*patchdrawfunc)(const UINT8*, const UINT8*, fixed_t);
	UINT32 alphalevel = 0;
	boolean flip = false;

	fixed_t col, ofs, colfrac, rowfrac, fdup;
	INT32 dupx, dupy;
	const column_t *column;
	UINT8 *desttop, *dest, *deststart, *destend;
	const UINT8 *source, *deststop;
	fixed_t pwidth; // patch width
	fixed_t offx = 0; // x offset

	if (rendermode == render_none)
		return;

#ifdef HWRENDER
	// oh please
	if (rendermode != render_soft && !con_startup)
	{
		HWR_DrawFixedPatch((GLPatch_t *)patch, x, y, pscale, scrn, colormap);
		return;
	}
#endif

	patchdrawfunc = standardpdraw;

	v_translevel = NULL;
	if ((alphalevel = ((scrn & V_ALPHAMASK) >> V_ALPHASHIFT)))
	{
		if (alphalevel == 13)
			alphalevel = hudminusalpha[hudtrans];
		else if (alphalevel == 14)
			alphalevel = 10 - hudtrans;
		/*else if (alphalevel == 15)
			alphalevel = hudplusalpha[hudtrans];*/

		if (alphalevel >= 10)
			return; // invis
	}
	if (alphalevel)
	{
		v_translevel = transtables + ((alphalevel-1)<<FF_TRANSSHIFT);
		patchdrawfunc = translucentpdraw;
	}

	v_colormap = NULL;
	if (colormap)
	{
		v_colormap = colormap;
		patchdrawfunc = (v_translevel) ? transmappedpdraw : mappedpdraw;
	}

	dupx = vid.dupx;
	dupy = vid.dupy;
	if (scrn & V_SCALEPATCHMASK) switch ((scrn & V_SCALEPATCHMASK) >> V_SCALEPATCHSHIFT)
	{
		case 1: // V_NOSCALEPATCH
			dupx = dupy = 1;
			break;
		case 2: // V_SMALLSCALEPATCH
			dupx = vid.smalldupx;
			dupy = vid.smalldupy;
			break;
		case 3: // V_MEDSCALEPATCH
			dupx = vid.meddupx;
			dupy = vid.meddupy;
			break;
		default:
			break;
	}

	// only use one dup, to avoid stretching (har har)
	dupx = dupy = (dupx < dupy ? dupx : dupy);
	fdup = FixedMul(dupx<<FRACBITS, pscale);
	colfrac = FixedDiv(FRACUNIT, fdup);
	rowfrac = FixedDiv(FRACUNIT, fdup);

	if (scrn & V_OFFSET) // Crosshair shit
	{
		y -= FixedMul((SHORT(patch->topoffset)*dupy)<<FRACBITS,  pscale);
		x -= FixedMul((SHORT(patch->leftoffset)*dupx)<<FRACBITS, pscale);
	}
	else
	{
		y -= FixedMul(SHORT(patch->topoffset)<<FRACBITS, pscale);

		if (scrn & V_FLIP)
		{
			flip = true;
			x -= FixedMul((SHORT(patch->width) - SHORT(patch->leftoffset))<<FRACBITS, pscale);
		}
		else
			x -= FixedMul(SHORT(patch->leftoffset)<<FRACBITS, pscale);
	}

	if (scrn & V_SPLITSCREEN)
		y += (BASEVIDHEIGHT/2)<<FRACBITS;

	if (scrn & V_HORZSCREEN)
		x += (BASEVIDWIDTH/2)<<FRACBITS;

	desttop = screens[scrn&V_PARAMMASK];

	if (!desttop)
		return;

	deststop = desttop + vid.rowbytes * vid.height;

	if (scrn & V_NOSCALESTART)
	{
		x >>= FRACBITS;
		y >>= FRACBITS;
		desttop += (y*vid.width) + x;
	}
	else
	{
		x = FixedMul(x,dupx<<FRACBITS);
		y = FixedMul(y,dupy<<FRACBITS);
		x >>= FRACBITS;
		y >>= FRACBITS;

		// Center it if necessary
		if (!(scrn & V_SCALEPATCHMASK))
		{
			// if it's meant to cover the whole screen, black out the rest
			if (x == 0 && FixedMul(SHORT(patch->width)<<FRACBITS, pscale)>>FRACBITS == BASEVIDWIDTH
				&& y == 0 && FixedMul(SHORT(patch->height)<<FRACBITS, pscale)>>FRACBITS == BASEVIDHEIGHT)
			{
				column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[0]));
				source = (const UINT8 *)(column) + 3;
				V_DrawFill(0, 0, BASEVIDWIDTH, BASEVIDHEIGHT, (column->topdelta == 0xff ? 31 : source[0]));
			}

			if (vid.width != BASEVIDWIDTH * dupx)
			{
				// dupx adjustments pretend that screen width is BASEVIDWIDTH * dupx,
				// so center this imaginary screen
				if ((scrn & (V_HORZSCREEN|V_SNAPTOLEFT)) == (V_HORZSCREEN|V_SNAPTOLEFT))
					x += (vid.width/2 - (BASEVIDWIDTH/2 * dupx));
				else if (scrn & V_SNAPTORIGHT)
					x += (vid.width - (BASEVIDWIDTH * dupx));
				else if (!(scrn & V_SNAPTOLEFT))
					x += (vid.width - (BASEVIDWIDTH * dupx)) / 2;
			}
			if (vid.height != BASEVIDHEIGHT * dupy)
			{
				// same thing here
				if ((scrn & (V_SPLITSCREEN|V_SNAPTOTOP)) == (V_SPLITSCREEN|V_SNAPTOTOP))
					desttop += (vid.height/2 - (BASEVIDHEIGHT/2 * dupy)) * vid.width;
				else if (scrn & V_SNAPTOBOTTOM)
					desttop += (vid.height - (BASEVIDHEIGHT * dupy)) * vid.width;
				else if (!(scrn & V_SNAPTOTOP))
					desttop += (vid.height - (BASEVIDHEIGHT * dupy)) * vid.width / 2;
			}
		}

		desttop += (y*vid.width) + x;
	}

	if (pscale != FRACUNIT) // scale width properly
	{
		pwidth = SHORT(patch->width)<<FRACBITS;
		pwidth = FixedMul(pwidth, pscale);
		pwidth = FixedMul(pwidth, dupx<<FRACBITS);
		pwidth >>= FRACBITS;
	}
	else
		pwidth = SHORT(patch->width) * dupx;

	deststart = desttop;
	destend = desttop + pwidth;

	for (col = 0; (col>>FRACBITS) < SHORT(patch->width); col += colfrac, ++offx, desttop++)
	{
		INT32 topdelta, prevdelta = -1;
		if (flip) // offx is measured from right edge instead of left
		{
			if (x+pwidth-offx < 0) // don't draw off the left of the screen (WRAP PREVENTION)
				break;
			if (x+pwidth-offx >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION)
				continue;
		}
		else
		{
			if (x+offx < 0) // don't draw off the left of the screen (WRAP PREVENTION)
				continue;
			if (x+offx >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION)
				break;
		}
		column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[col>>FRACBITS]));

		while (column->topdelta != 0xff)
		{
			topdelta = column->topdelta;
			if (topdelta <= prevdelta)
				topdelta += prevdelta;
			prevdelta = topdelta;
			source = (const UINT8 *)(column) + 3;
			dest = desttop;
			if (flip)
				dest = deststart + (destend - desttop);
			dest += FixedInt(FixedMul(topdelta<<FRACBITS,fdup))*vid.width;

			for (ofs = 0; dest < deststop && (ofs>>FRACBITS) < column->length; ofs += rowfrac)
			{
				if (dest >= screens[scrn&V_PARAMMASK]) // don't draw off the top of the screen (CRASH PREVENTION)
					*dest = patchdrawfunc(dest, source, ofs);
				dest += vid.width;
			}
			column = (const column_t *)((const UINT8 *)column + column->length + 4);
		}
	}
}

// Draws a patch cropped and scaled to arbitrary size.
void V_DrawCroppedPatch(fixed_t x, fixed_t y, fixed_t pscale, INT32 scrn, patch_t *patch, fixed_t sx, fixed_t sy, fixed_t w, fixed_t h)
{
	fixed_t col, ofs, colfrac, rowfrac, fdup;
	INT32 dupx, dupy;
	const column_t *column;
	UINT8 *desttop, *dest;
	const UINT8 *source, *deststop;

	if (rendermode == render_none)
		return;

#ifdef HWRENDER
	// Done
	if (rendermode != render_soft && !con_startup)
	{
		HWR_DrawCroppedPatch((GLPatch_t*)patch,x,y,pscale,scrn,sx,sy,w,h);
		return;
	}
#endif

	// only use one dup, to avoid stretching (har har)
	dupx = dupy = (vid.dupx < vid.dupy ? vid.dupx : vid.dupy);
	fdup = FixedMul(dupx<<FRACBITS, pscale);
	colfrac = FixedDiv(FRACUNIT, fdup);
	rowfrac = FixedDiv(FRACUNIT, fdup);

	y -= FixedMul(SHORT(patch->topoffset)<<FRACBITS, pscale);
	x -= FixedMul(SHORT(patch->leftoffset)<<FRACBITS, pscale);

	desttop = screens[scrn&V_PARAMMASK];

	if (!desttop)
		return;

	deststop = desttop + vid.rowbytes * vid.height;

	if (scrn & V_NOSCALESTART) {
		x >>= FRACBITS;
		y >>= FRACBITS;
		desttop += (y*vid.width) + x;
	}
	else
	{
		x = FixedMul(x,dupx<<FRACBITS);
		y = FixedMul(y,dupy<<FRACBITS);
		x >>= FRACBITS;
		y >>= FRACBITS;
		desttop += (y*vid.width) + x;

		// Center it if necessary
		if (!(scrn & V_SCALEPATCHMASK))
		{
			if (vid.width != BASEVIDWIDTH * dupx)
			{
				// dupx adjustments pretend that screen width is BASEVIDWIDTH * dupx,
				// so center this imaginary screen
				if (scrn & V_SNAPTORIGHT)
					desttop += (vid.width - (BASEVIDWIDTH * dupx));
				else if (!(scrn & V_SNAPTOLEFT))
					desttop += (vid.width - (BASEVIDWIDTH * dupx)) / 2;
			}
			if (vid.height != BASEVIDHEIGHT * dupy)
			{
				// same thing here
				if (scrn & V_SNAPTOBOTTOM)
					desttop += (vid.height - (BASEVIDHEIGHT * dupy)) * vid.width;
				else if (!(scrn & V_SNAPTOTOP))
					desttop += (vid.height - (BASEVIDHEIGHT * dupy)) * vid.width / 2;
			}
			// if it's meant to cover the whole screen, black out the rest
			if (x == 0 && SHORT(patch->width) == BASEVIDWIDTH && y == 0 && SHORT(patch->height) == BASEVIDHEIGHT)
			{
				column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[0]));
				source = (const UINT8 *)(column) + 3;
				V_DrawFill(0, 0, BASEVIDWIDTH, BASEVIDHEIGHT, (column->topdelta == 0xff ? 31 : source[0]));
			}
		}
	}

	for (col = sx<<FRACBITS; (col>>FRACBITS) < SHORT(patch->width) && (col>>FRACBITS) < w; col += colfrac, ++x, desttop++)
	{
		INT32 topdelta, prevdelta = -1;
		if (x < 0) // don't draw off the left of the screen (WRAP PREVENTION)
			continue;
		if (x >= vid.width) // don't draw off the right of the screen (WRAP PREVENTION)
			break;
		column = (const column_t *)((const UINT8 *)(patch) + LONG(patch->columnofs[col>>FRACBITS]));

		while (column->topdelta != 0xff)
		{
			topdelta = column->topdelta;
			if (topdelta <= prevdelta)
				topdelta += prevdelta;
			prevdelta = topdelta;
			source = (const UINT8 *)(column) + 3;
			dest = desttop;
			dest += FixedInt(FixedMul(topdelta<<FRACBITS,fdup))*vid.width;

			for (ofs = sy<<FRACBITS; dest < deststop && (ofs>>FRACBITS) < column->length && (ofs>>FRACBITS) < h; ofs += rowfrac)
			{
				if (dest >= screens[scrn&V_PARAMMASK]) // don't draw off the top of the screen (CRASH PREVENTION)
					*dest = source[ofs>>FRACBITS];
				dest += vid.width;
			}
			column = (const column_t *)((const UINT8 *)column + column->length + 4);
		}
	}
}

//
// V_DrawContinueIcon
// Draw a mini player!  If we can, that is.  Otherwise we draw a star.
//
void V_DrawContinueIcon(INT32 x, INT32 y, INT32 flags, INT32 skinnum, UINT8 skincolor)
{
	if (skins[skinnum].flags & SF_HIRES
#ifdef HWRENDER
//	|| (rendermode != render_soft && rendermode != render_none)
#endif
	)
		V_DrawScaledPatch(x - 10, y - 14, flags, W_CachePatchName("CONTINS", PU_CACHE));
	else
	{
		spriteframe_t *sprframe = &skins[skinnum].spritedef.spriteframes[2 & FF_FRAMEMASK];
		patch_t *patch = W_CachePatchNum(sprframe->lumppat[0], PU_CACHE);
		const UINT8 *colormap = R_GetTranslationColormap(skinnum, skincolor, GTC_CACHE);

		// No variant for translucency
		V_DrawTinyMappedPatch(x, y, flags, patch, colormap);
	}
}

//
// V_DrawBlock
// Draw a linear block of pixels into the view buffer.
//
void V_DrawBlock(INT32 x, INT32 y, INT32 scrn, INT32 width, INT32 height, const UINT8 *src)
{
	UINT8 *dest;
	const UINT8 *deststop;

#ifdef RANGECHECK
	if (x < 0 || x + width > vid.width || y < 0 || y + height > vid.height || (unsigned)scrn > 4)
		I_Error("Bad V_DrawBlock");
#endif

	dest = screens[scrn] + y*vid.width + x;
	deststop = screens[scrn] + vid.rowbytes * vid.height;

	while (height--)
	{
		M_Memcpy(dest, src, width);

		src += width;
		dest += vid.width;
		if (dest > deststop)
			return;
	}
}

static void V_BlitScaledPic(INT32 px1, INT32 py1, INT32 scrn, pic_t *pic);
//  Draw a linear pic, scaled, TOTALLY CRAP CODE!!! OPTIMISE AND ASM!!
//
void V_DrawScaledPic(INT32 rx1, INT32 ry1, INT32 scrn, INT32 lumpnum)
{
#ifdef HWRENDER
	if (rendermode != render_soft)
	{
		HWR_DrawPic(rx1, ry1, lumpnum);
		return;
	}
#endif

	V_BlitScaledPic(rx1, ry1, scrn, W_CacheLumpNum(lumpnum, PU_CACHE));
}

static void V_BlitScaledPic(INT32 rx1, INT32 ry1, INT32 scrn, pic_t * pic)
{
	INT32 dupx, dupy;
	INT32 x, y;
	UINT8 *src, *dest;
	INT32 width, height;

	width = SHORT(pic->width);
	height = SHORT(pic->height);
	scrn &= V_PARAMMASK;

	if (pic->mode != 0)
	{
		CONS_Debug(DBG_RENDER, "pic mode %d not supported in Software\n", pic->mode);
		return;
	}

	dest = screens[scrn] + max(0, ry1 * vid.width) + max(0, rx1);
	// y cliping to the screen
	if (ry1 + height * vid.dupy >= vid.width)
		height = (vid.width - ry1) / vid.dupy - 1;
	// WARNING no x clipping (not needed for the moment)

	for (y = max(0, -ry1 / vid.dupy); y < height; y++)
	{
		for (dupy = vid.dupy; dupy; dupy--)
		{
			src = pic->data + y * width;
			for (x = 0; x < width; x++)
			{
				for (dupx = vid.dupx; dupx; dupx--)
					*dest++ = *src;
				src++;
			}
			dest += vid.width - vid.dupx * width;
		}
	}
}

//
// Fills a box of pixels with a single color, NOTE: scaled to screen size
//
void V_DrawFill(INT32 x, INT32 y, INT32 w, INT32 h, INT32 c)
{
	UINT8 *dest;
	const UINT8 *deststop;

	if (rendermode == render_none)
		return;

#ifdef HWRENDER
	if (rendermode != render_soft && !con_startup)
	{
		HWR_DrawFill(x, y, w, h, c);
		return;
	}
#endif

	if (!(c & V_NOSCALESTART))
	{
		INT32 dupx = vid.dupx, dupy = vid.dupy;

		if (x == 0 && y == 0 && w == BASEVIDWIDTH && h == BASEVIDHEIGHT)
		{ // Clear the entire screen, from dest to deststop. Yes, this really works.
			memset(screens[0], (UINT8)(c&255), vid.width * vid.height * vid.bpp);
			return;
		}

		x *= dupx;
		y *= dupy;
		w *= dupx;
		h *= dupy;

		// Center it if necessary
		if (vid.width != BASEVIDWIDTH * dupx)
		{
			// dupx adjustments pretend that screen width is BASEVIDWIDTH * dupx,
			// so center this imaginary screen
			if (c & V_SNAPTORIGHT)
				x += (vid.width - (BASEVIDWIDTH * dupx));
			else if (!(c & V_SNAPTOLEFT))
				x += (vid.width - (BASEVIDWIDTH * dupx)) / 2;
		}
		if (vid.height != BASEVIDHEIGHT * dupy)
		{
			// same thing here
			if (c & V_SNAPTOBOTTOM)
				y += (vid.height - (BASEVIDHEIGHT * dupy));
			else if (!(c & V_SNAPTOTOP))
				y += (vid.height - (BASEVIDHEIGHT * dupy)) / 2;
		}
	}

	if (x >= vid.width || y >= vid.height)
		return; // off the screen
	if (x < 0)
	{
		w += x;
		x = 0;
	}
	if (y < 0)
	{
		h += y;
		y = 0;
	}

	if (w <= 0 || h <= 0)
		return; // zero width/height wouldn't draw anything
	if (x + w > vid.width)
		w = vid.width - x;
	if (y + h > vid.height)
		h = vid.height - y;

	dest = screens[0] + y*vid.width + x;
	deststop = screens[0] + vid.rowbytes * vid.height;

	c &= 255;

	for (;(--h >= 0) && dest < deststop; dest += vid.width)
		memset(dest, c, w * vid.bpp);
}

//
// Fills a triangle of pixels with a single color, NOTE: scaled to screen size
//
// ...
// ..  <-- this shape only for now, i'm afraid
// .
//
void V_DrawDiag(INT32 x, INT32 y, INT32 wh, INT32 c)
{
	UINT8 *dest;
	const UINT8 *deststop;
	INT32 w, h, wait = 0;

	if (rendermode == render_none)
		return;

#ifdef HWRENDER
	if (rendermode != render_soft && !con_startup)
	{
		HWR_DrawDiag(x, y, wh, c);
		return;
	}
#endif

	if (!(c & V_NOSCALESTART))
	{
		INT32 dupx = vid.dupx, dupy = vid.dupy;

		x *= dupx;
		y *= dupy;
		wh *= dupx;

		// Center it if necessary
		if (vid.width != BASEVIDWIDTH * dupx)
		{
			// dupx adjustments pretend that screen width is BASEVIDWIDTH * dupx,
			// so center this imaginary screen
			if (c & V_SNAPTORIGHT)
				x += (vid.width - (BASEVIDWIDTH * dupx));
			else if (!(c & V_SNAPTOLEFT))
				x += (vid.width - (BASEVIDWIDTH * dupx)) / 2;
		}
		if (vid.height != BASEVIDHEIGHT * dupy)
		{
			// same thing here
			if (c & V_SNAPTOBOTTOM)
				y += (vid.height - (BASEVIDHEIGHT * dupy));
			else if (!(c & V_SNAPTOTOP))
				y += (vid.height - (BASEVIDHEIGHT * dupy)) / 2;
		}
	}

	if (x >= vid.width || y >= vid.height)
		return; // off the screen

	if (y < 0)
	{
		wh += y;
		y = 0;
	}

	w = h = wh;

	if (x < 0)
	{
		w += x;
		x = 0;
	}

	if (w <= 0 || h <= 0)
		return; // zero width/height wouldn't draw anything
	if (x + w > vid.width)
	{
		wait = w - (vid.width - x);
		w = vid.width - x;
	}
	if (y + w > vid.height)
		h = vid.height - y;

	if (h > w)
		h = w;

	dest = screens[0] + y*vid.width + x;
	deststop = screens[0] + vid.rowbytes * vid.height;

	c &= 255;

	for (;(--h >= 0) && dest < deststop; dest += vid.width)
	{
		memset(dest, c, w * vid.bpp);
		if (wait)
			wait--;
		else
			w--;
	}
}

//
// Fills a box of pixels using a flat texture as a pattern, scaled to screen size.
//
void V_DrawFlatFill(INT32 x, INT32 y, INT32 w, INT32 h, lumpnum_t flatnum)
{
	INT32 u, v, dupx, dupy;
	fixed_t dx, dy, xfrac, yfrac;
	const UINT8 *src, *deststop;
	UINT8 *flat, *dest;
	size_t size, lflatsize, flatshift;

#ifdef HWRENDER
	if (rendermode != render_soft && rendermode != render_none)
	{
		HWR_DrawFlatFill(x, y, w, h, flatnum);
		return;
	}
#endif

	size = W_LumpLength(flatnum);

	switch (size)
	{
		case 4194304: // 2048x2048 lump
			lflatsize = 2048;
			flatshift = 10;
			break;
		case 1048576: // 1024x1024 lump
			lflatsize = 1024;
			flatshift = 9;
			break;
		case 262144:// 512x512 lump
			lflatsize = 512;
			flatshift = 8;
			break;
		case 65536: // 256x256 lump
			lflatsize = 256;
			flatshift = 7;
			break;
		case 16384: // 128x128 lump
			lflatsize = 128;
			flatshift = 7;
			break;
		case 1024: // 32x32 lump
			lflatsize = 32;
			flatshift = 5;
			break;
		default: // 64x64 lump
			lflatsize = 64;
			flatshift = 6;
			break;
	}

	flat = W_CacheLumpNum(flatnum, PU_CACHE);

	dupx = dupy = (vid.dupx < vid.dupy ? vid.dupx : vid.dupy);

	dest = screens[0] + y*dupy*vid.width + x*dupx;
	deststop = screens[0] + vid.rowbytes * vid.height;

	// from V_DrawScaledPatch
	if (vid.width != BASEVIDWIDTH * dupx)
	{
		// dupx adjustments pretend that screen width is BASEVIDWIDTH * dupx,
		// so center this imaginary screen
		dest += (vid.width - (BASEVIDWIDTH * dupx)) / 2;
	}
	if (vid.height != BASEVIDHEIGHT * dupy)
	{
		// same thing here
		dest += (vid.height - (BASEVIDHEIGHT * dupy)) * vid.width / 2;
	}

	w *= dupx;
	h *= dupy;

	dx = FixedDiv(FRACUNIT, dupx<<(FRACBITS-2));
	dy = FixedDiv(FRACUNIT, dupy<<(FRACBITS-2));

	yfrac = 0;
	for (v = 0; v < h; v++, dest += vid.width)
	{
		xfrac = 0;
		src = flat + (((yfrac>>FRACBITS) & (lflatsize - 1)) << flatshift);
		for (u = 0; u < w; u++)
		{
			if (&dest[u] > deststop)
				return;
			dest[u] = src[(xfrac>>FRACBITS)&(lflatsize-1)];
			xfrac += dx;
		}
		yfrac += dy;
	}
}

//
// V_DrawPatchFill
//
void V_DrawPatchFill(patch_t *pat)
{
	INT32 dupz = (vid.dupx < vid.dupy ? vid.dupx : vid.dupy);
	INT32 x, y, pw = SHORT(pat->width) * dupz, ph = SHORT(pat->height) * dupz;

	for (x = 0; x < vid.width; x += pw)
	{
		for (y = 0; y < vid.height; y += ph)
			V_DrawScaledPatch(x, y, V_NOSCALESTART, pat);
	}
}

//
// Fade all the screen buffer, so that the menu is more readable,
// especially now that we use the small hufont in the menus...
// If color is 0x00 to 0xFF, draw transtable (strength range 0-9).
// Else, use COLORMAP lump (strength range 0-31).
// IF YOU ARE NOT CAREFUL, THIS CAN AND WILL CRASH!
// I have kept the safety checks out of this function;
// the v.fadeScreen Lua interface handles those.
//
void V_DrawFadeScreen(UINT16 color, UINT8 strength)
{
#ifdef HWRENDER
    if (rendermode != render_soft && rendermode != render_none)
    {
        HWR_FadeScreenMenuBack(color, strength);
        return;
    }
#endif

    {
        const UINT8 *fadetable = ((color & 0xFF00) // Color is not palette index?
        ? ((UINT8 *)colormaps + strength*256) // Do COLORMAP fade.
        : ((UINT8 *)transtables + ((9-strength)<<FF_TRANSSHIFT) + color*256)); // Else, do TRANSMAP** fade.
        const UINT8 *deststop = screens[0] + vid.rowbytes * vid.height;
        UINT8 *buf = screens[0];

        // heavily simplified -- we don't need to know x or y
        // position when we're doing a full screen fade
        for (; buf < deststop; ++buf)
            *buf = fadetable[*buf];
    }
}

// Simple translucency with one color, over a set number of lines starting from the top.
void V_DrawFadeConsBack(INT32 plines)
{
	UINT8 *deststop, *buf;

#ifdef HWRENDER // not win32 only 19990829 by Kin
	if (rendermode != render_soft && rendermode != render_none)
	{
		UINT32 hwcolor;
		switch (cons_backcolor.value)
		{
			case 0:		hwcolor = 0xffffff00;	break; // White
			case 1:		hwcolor = 0x80808000;	break; // Gray
			case 2:		hwcolor = 0x40201000;	break; // Brown
			case 3:		hwcolor = 0xff000000;	break; // Red
			case 4:		hwcolor = 0xff800000;	break; // Orange
			case 5:		hwcolor = 0x80800000;	break; // Yellow
			case 6:		hwcolor = 0x00800000;	break; // Green
			case 7:		hwcolor = 0x0000ff00;	break; // Blue
			case 8:		hwcolor = 0x4080ff00;	break; // Cyan
			// Default green
			default:	hwcolor = 0x00800000;	break;
		}
		HWR_DrawConsoleBack(hwcolor, plines);
		return;
	}
#endif

	// heavily simplified -- we don't need to know x or y position,
	// just the stop position
	deststop = screens[0] + vid.rowbytes * min(plines, vid.height);
	for (buf = screens[0]; buf < deststop; ++buf)
		*buf = consolebgmap[*buf];
}

// Gets string colormap, used for 0x80 color codes
//
const UINT8 *V_GetStringColormap(INT32 colorflags)
{
	switch ((colorflags & V_CHARCOLORMASK) >> V_CHARCOLORSHIFT)
	{
	case 1: // 0x81, purple
		return purplemap;
	case 2: // 0x82, yellow
		return yellowmap;
	case 3: // 0x83, lgreen
		return greenmap;
	case 4: // 0x84, blue
		return bluemap;
	case 5: // 0x85, red
		return redmap;
	case 6: // 0x86, gray
		return graymap;
	case 7: // 0x87, orange
		return orangemap;
	case 8: // 0x88, sky
		return skymap;
	default: // reset
		return NULL;
	}
}

// Writes a single character (draw WHITE if bit 7 set)
//
void V_DrawCharacter(INT32 x, INT32 y, INT32 c, boolean lowercaseallowed)
{
	INT32 w, flags;
	const UINT8 *colormap = V_GetStringColormap(c);

	flags = c & ~(V_CHARCOLORMASK | V_PARAMMASK);
	c &= 0x7f;
	if (lowercaseallowed)
		c -= HU_FONTSTART;
	else
		c = toupper(c) - HU_FONTSTART;
	if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
		return;

	w = SHORT(hu_font[c]->width);
	if (x + w > vid.width)
		return;

	if (colormap != NULL)
		V_DrawMappedPatch(x, y, flags, hu_font[c], colormap);
	else
		V_DrawScaledPatch(x, y, flags, hu_font[c]);
}

// Precompile a wordwrapped string to any given width.
// This is a muuuch better method than V_WORDWRAP.
char *V_WordWrap(INT32 x, INT32 w, INT32 option, const char *string)
{
	int c;
	size_t chw, i, lastusablespace = 0;
	size_t slen;
	char *newstring = Z_StrDup(string);
	INT32 spacewidth = 4, charwidth = 0;

	slen = strlen(string);

	if (w == 0)
		w = BASEVIDWIDTH;
	w -= x;
	x = 0;

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 8;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 8;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 6;
		default:
			break;
	}

	for (i = 0; i < slen; ++i)
	{
		c = newstring[i];
		if ((UINT8)c >= 0x80 && (UINT8)c <= 0x89) //color parsing! -Inuyasha 2.16.09
			continue;

		if (c == '\n')
		{
			x = 0;
			lastusablespace = 0;
			continue;
		}

		if (!(option & V_ALLOWLOWERCASE))
			c = toupper(c);
		c -= HU_FONTSTART;

		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
		{
			chw = spacewidth;
			lastusablespace = i;
		}
		else
			chw = (charwidth ? charwidth : hu_font[c]->width);

		x += chw;

		if (lastusablespace != 0 && x > w)
		{
			newstring[lastusablespace] = '\n';
			i = lastusablespace;
			lastusablespace = 0;
			x = 0;
		}
	}
	return newstring;
}

//
// Write a string using the hu_font
// NOTE: the text is centered for screens larger than the base width
//
void V_DrawString(INT32 x, INT32 y, INT32 option, const char *string)
{
	INT32 w, c, cx = x, cy = y, dupx, dupy, scrwidth, center = 0, left = 0;
	const char *ch = string;
	INT32 charflags = 0;
	const UINT8 *colormap = NULL;
	INT32 spacewidth = 4, charwidth = 0;

	INT32 lowercase = (option & V_ALLOWLOWERCASE);
	option &= ~V_FLIP; // which is also shared with V_ALLOWLOWERCASE...

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	charflags = (option & V_CHARCOLORMASK);

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 8;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 8;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 6;
		default:
			break;
	}

	for (;;ch++)
	{
		if (!*ch)
			break;
		if (*ch & 0x80) //color parsing -x 2.16.09
		{
			// manually set flags override color codes
			if (!(option & V_CHARCOLORMASK))
				charflags = ((*ch & 0x7f) << V_CHARCOLORSHIFT) & V_CHARCOLORMASK;
			continue;
		}
		if (*ch == '\n')
		{
			cx = x;

			if (option & V_RETURN8)
				cy += 8*dupy;
			else
				cy += 12*dupy;

			continue;
		}

		c = *ch;
		if (!lowercase)
			c = toupper(c);
		c -= HU_FONTSTART;

		// character does not exist or is a space
		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
		{
			cx += spacewidth * dupx;
			continue;
		}

		if (charwidth)
		{
			w = charwidth * dupx;
			center = w/2 - SHORT(hu_font[c]->width)*dupx/2;
		}
		else
			w = SHORT(hu_font[c]->width) * dupx;

		if (cx > scrwidth)
			break;
		if (cx+left + w < 0) //left boundary check
		{
			cx += w;
			continue;
		}

		colormap = V_GetStringColormap(charflags);
		V_DrawFixedPatch((cx + center)<<FRACBITS, cy<<FRACBITS, FRACUNIT, option, hu_font[c], colormap);

		cx += w;
	}
}

// SRB2kart
void V_DrawKartString(INT32 x, INT32 y, INT32 option, const char *string)
{
	INT32 w, c, cx = x, cy = y, dupx, dupy, scrwidth, center = 0, left = 0;
	const char *ch = string;
	INT32 charflags = 0;
	const UINT8 *colormap = NULL;
	INT32 spacewidth = 12, charwidth = 0;

	INT32 lowercase = (option & V_ALLOWLOWERCASE);
	option &= ~V_FLIP; // which is also shared with V_ALLOWLOWERCASE...

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	charflags = (option & V_CHARCOLORMASK);

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 12;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 12;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 6;
		default:
			break;
	}

	for (;;ch++)
	{
		if (!*ch)
			break;
		if (*ch & 0x80) //color parsing -x 2.16.09
		{
			// manually set flags override color codes
			if (!(option & V_CHARCOLORMASK))
				charflags = ((*ch & 0x7f) << V_CHARCOLORSHIFT) & V_CHARCOLORMASK;
			continue;
		}
		if (*ch == '\n')
		{
			cx = x;

			if (option & V_RETURN8)
				cy += 8*dupy;
			else
				cy += 12*dupy;

			continue;
		}

		c = *ch;
		if (!lowercase)
			c = toupper(c);
		c -= KART_FONTSTART;

		// character does not exist or is a space
		if (c < 0 || c >= KART_FONTSIZE || !kart_font[c])
		{
			cx += spacewidth * dupx;
			continue;
		}

		if (charwidth)
		{
			w = charwidth * dupx;
			center = w/2 - SHORT(kart_font[c]->width)*dupx/2;
		}
		else
			w = SHORT(kart_font[c]->width) * dupx;

		if (cx > scrwidth)
			break;
		if (cx+left + w < 0) //left boundary check
		{
			cx += w;
			continue;
		}

		colormap = V_GetStringColormap(charflags);
		V_DrawFixedPatch((cx + center)<<FRACBITS, cy<<FRACBITS, FRACUNIT, option, kart_font[c], colormap);

		cx += w;
	}
}
//

void V_DrawCenteredString(INT32 x, INT32 y, INT32 option, const char *string)
{
	x -= V_StringWidth(string, option)/2;
	V_DrawString(x, y, option, string);
}

void V_DrawRightAlignedString(INT32 x, INT32 y, INT32 option, const char *string)
{
	x -= V_StringWidth(string, option);
	V_DrawString(x, y, option, string);
}

//
// Write a string using the hu_font, 0.5x scale
// NOTE: the text is centered for screens larger than the base width
//
void V_DrawSmallString(INT32 x, INT32 y, INT32 option, const char *string)
{
	INT32 w, c, cx = x, cy = y, dupx, dupy, scrwidth, center = 0, left = 0;
	const char *ch = string;
	INT32 charflags = 0;
	const UINT8 *colormap = NULL;
	INT32 spacewidth = 2, charwidth = 0;

	INT32 lowercase = (option & V_ALLOWLOWERCASE);
	option &= ~V_FLIP; // which is also shared with V_ALLOWLOWERCASE...

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	charflags = (option & V_CHARCOLORMASK);

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 4;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 4;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 3;
		default:
			break;
	}

	for (;;ch++)
	{
		if (!*ch)
			break;
		if (*ch & 0x80) //color parsing -x 2.16.09
		{
			// manually set flags override color codes
			if (!(option & V_CHARCOLORMASK))
				charflags = ((*ch & 0x7f) << V_CHARCOLORSHIFT) & V_CHARCOLORMASK;
			continue;
		}
		if (*ch == '\n')
		{
			cx = x;

			if (option & V_RETURN8)
				cy += 4*dupy;
			else
				cy += 6*dupy;

			continue;
		}

		c = *ch;
		if (!lowercase)
			c = toupper(c);
		c -= HU_FONTSTART;

		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
		{
			cx += spacewidth * dupx;
			continue;
		}

		if (charwidth)
		{
			w = charwidth * dupx;
			center = w/2 - SHORT(hu_font[c]->width)*dupx/4;
		}
		else
			w = SHORT(hu_font[c]->width) * dupx / 2;
		if (cx > scrwidth)
			break;
		if (cx+left + w < 0) //left boundary check
		{
			cx += w;
			continue;
		}

		colormap = V_GetStringColormap(charflags);
		V_DrawFixedPatch((cx + center)<<FRACBITS, cy<<FRACBITS, FRACUNIT/2, option, hu_font[c], colormap);

		cx += w;
	}
}

void V_DrawRightAlignedSmallString(INT32 x, INT32 y, INT32 option, const char *string)
{
	x -= V_SmallStringWidth(string, option);
	V_DrawSmallString(x, y, option, string);
}

//
// Write a string using the tny_font
// NOTE: the text is centered for screens larger than the base width
//
void V_DrawThinString(INT32 x, INT32 y, INT32 option, const char *string)
{
	INT32 w, c, cx = x, cy = y, dupx, dupy, scrwidth, left = 0;
	const char *ch = string;
	INT32 charflags = 0;
	const UINT8 *colormap = NULL;
	INT32 spacewidth = 2, charwidth = 0;

	INT32 lowercase = (option & V_ALLOWLOWERCASE);
	option &= ~V_FLIP; // which is also shared with V_ALLOWLOWERCASE...

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	charflags = (option & V_CHARCOLORMASK);

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 5;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 5;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 3;
		default:
			break;
	}

	for (;;ch++)
	{
		if (!*ch)
			break;
		if (*ch & 0x80) //color parsing -x 2.16.09
		{
			// manually set flags override color codes
			if (!(option & V_CHARCOLORMASK))
				charflags = ((*ch & 0x7f) << V_CHARCOLORSHIFT) & V_CHARCOLORMASK;
			continue;
		}
		if (*ch == '\n')
		{
			cx = x;

			if (option & V_RETURN8)
				cy += 8*dupy;
			else
				cy += 12*dupy;

			continue;
		}

		c = *ch;
		if (!lowercase || !tny_font[c-HU_FONTSTART])
			c = toupper(c);
		c -= HU_FONTSTART;

		if (c < 0 || c >= HU_FONTSIZE || !tny_font[c])
		{
			cx += spacewidth * dupx;
			continue;
		}

		if (charwidth)
			w = charwidth * dupx;
		else
			w = (SHORT(tny_font[c]->width) * dupx);

		if (cx > scrwidth)
			break;
		if (cx+left + w < 0) //left boundary check
		{
			cx += w;
			continue;
		}

		colormap = V_GetStringColormap(charflags);
		V_DrawFixedPatch(cx<<FRACBITS, cy<<FRACBITS, FRACUNIT, option, tny_font[c], colormap);

		cx += w;
	}
}

void V_DrawRightAlignedThinString(INT32 x, INT32 y, INT32 option, const char *string)
{
	x -= V_ThinStringWidth(string, option);
	V_DrawThinString(x, y, option, string);
}

// Draws a string at a fixed_t location.
void V_DrawStringAtFixed(fixed_t x, fixed_t y, INT32 option, const char *string)
{
	fixed_t cx = x, cy = y;
	INT32 w, c, dupx, dupy, scrwidth, center = 0, left = 0;
	const char *ch = string;
	INT32 spacewidth = 4, charwidth = 0;

	INT32 lowercase = (option & V_ALLOWLOWERCASE);
	option &= ~V_FLIP; // which is also shared with V_ALLOWLOWERCASE...

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 8;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 8;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 6;
		default:
			break;
	}

	for (;;ch++)
	{
		if (!*ch)
			break;
		if (*ch & 0x80) //color ignoring
			continue;
		if (*ch == '\n')
		{
			cx = x;

			if (option & V_RETURN8)
				cy += (8*dupy)<<FRACBITS;
			else
				cy += (12*dupy)<<FRACBITS;

			continue;
		}

		c = *ch;
		if (!lowercase)
			c = toupper(c);
		c -= HU_FONTSTART;

		// character does not exist or is a space
		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
		{
			cx += (spacewidth * dupx)<<FRACBITS;
			continue;
		}

		if (charwidth)
		{
			w = charwidth * dupx;
			center = w/2 - SHORT(hu_font[c]->width)*(dupx/2);
		}
		else
			w = SHORT(hu_font[c]->width) * dupx;

		if ((cx>>FRACBITS) > scrwidth)
			break;
		if (cx+left + w < 0) //left boundary check
		{
			cx += w<<FRACBITS;
			continue;
		}

		V_DrawSciencePatch(cx + (center<<FRACBITS), cy, option, hu_font[c], FRACUNIT);

		cx += w<<FRACBITS;
	}
}

// Draws a tallnum.  Replaces two functions in y_inter and st_stuff
void V_DrawTallNum(INT32 x, INT32 y, INT32 flags, INT32 num)
{
	INT32 w = SHORT(tallnum[0]->width);
	boolean neg;

	if (flags & V_NOSCALESTART)
		w *= vid.dupx;

	if ((neg = num < 0))
		num = -num;

	// draw the number
	do
	{
		x -= w;
		V_DrawScaledPatch(x, y, flags, tallnum[num % 10]);
		num /= 10;
	} while (num);

	// draw a minus sign if necessary
	if (neg)
		V_DrawScaledPatch(x - w, y, flags, tallminus); // Tails
}

// Draws a number with a set number of digits.
// Does not handle negative numbers in a special way, don't try to feed it any.
void V_DrawPaddedTallNum(INT32 x, INT32 y, INT32 flags, INT32 num, INT32 digits)
{
	INT32 w = SHORT(tallnum[0]->width);

	if (flags & V_NOSCALESTART)
		w *= vid.dupx;

	if (num < 0)
		num = -num;

	// draw the number
	do
	{
		x -= w;
		V_DrawScaledPatch(x, y, flags, tallnum[num % 10]);
		num /= 10;
	} while (--digits);
}

// Write a string using the credit font
// NOTE: the text is centered for screens larger than the base width
//
void V_DrawCreditString(fixed_t x, fixed_t y, INT32 option, const char *string)
{
	INT32 w, c, dupx, dupy, scrwidth = BASEVIDWIDTH;
	fixed_t cx = x, cy = y;
	const char *ch = string;

	// It's possible for string to be a null pointer
	if (!string)
		return;

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
		dupx = dupy = 1;

	for (;;)
	{
		c = *ch++;
		if (!c)
			break;
		if (c == '\n')
		{
			cx = x;
			cy += (12*dupy)<<FRACBITS;
			continue;
		}

		c = toupper(c) - CRED_FONTSTART;
		if (c < 0 || c >= CRED_FONTSIZE)
		{
			cx += (16*dupx)<<FRACBITS;
			continue;
		}

		w = SHORT(cred_font[c]->width) * dupx;
		if ((cx>>FRACBITS) > scrwidth)
			break;

		V_DrawSciencePatch(cx, cy, option, cred_font[c], FRACUNIT);
		cx += w<<FRACBITS;
	}
}

// Find string width from cred_font chars
//
INT32 V_CreditStringWidth(const char *string)
{
	INT32 c, w = 0;
	size_t i;

	// It's possible for string to be a null pointer
	if (!string)
		return 0;

	for (i = 0; i < strlen(string); i++)
	{
		c = toupper(string[i]) - CRED_FONTSTART;
		if (c < 0 || c >= CRED_FONTSIZE)
			w += 16;
		else
			w += SHORT(cred_font[c]->width);
	}

	return w;
}

// Write a string using the level title font
// NOTE: the text is centered for screens larger than the base width
//
void V_DrawLevelTitle(INT32 x, INT32 y, INT32 option, const char *string)
{
	INT32 w, c, cx = x, cy = y, dupx, dupy, scrwidth, left = 0;
	const char *ch = string;

	if (option & V_NOSCALESTART)
	{
		dupx = vid.dupx;
		dupy = vid.dupy;
		scrwidth = vid.width;
	}
	else
	{
		dupx = dupy = 1;
		scrwidth = vid.width/vid.dupx;
		left = (scrwidth - BASEVIDWIDTH)/2;
	}

	for (;;)
	{
		c = *ch++;
		if (!c)
			break;
		if (c == '\n')
		{
			cx = x;
			cy += 12*dupy;
			continue;
		}

		c = toupper(c) - LT_FONTSTART;
		if (c < 0 || c >= LT_FONTSIZE || !lt_font[c])
		{
			cx += 12*dupx;
			continue;
		}

		w = SHORT(lt_font[c]->width) * dupx;

		if (cx > scrwidth)
			break;
		if (cx + left < 0) //left boundary check
		{
			cx += w;
			continue;
		}

		V_DrawScaledPatch(cx, cy, option, lt_font[c]);
		cx += w;
	}
}

// Find string width from lt_font chars
//
INT32 V_LevelNameWidth(const char *string)
{
	INT32 c, w = 0;
	size_t i;

	for (i = 0; i < strlen(string); i++)
	{
		c = toupper(string[i]) - LT_FONTSTART;
		if (c < 0 || c >= LT_FONTSIZE || !lt_font[c])
			w += 12;
		else
			w += SHORT(lt_font[c]->width);
	}

	return w;
}

// Find max height of the string
//
INT32 V_LevelNameHeight(const char *string)
{
	INT32 c, w = 0;
	size_t i;

	for (i = 0; i < strlen(string); i++)
	{
		c = toupper(string[i]) - LT_FONTSTART;
		if (c < 0 || c >= LT_FONTSIZE || !lt_font[c])
			continue;

		if (SHORT(lt_font[c]->height) > w)
			w = SHORT(lt_font[c]->height);
	}

	return w;
}

//
// Find string width from hu_font chars
//
INT32 V_StringWidth(const char *string, INT32 option)
{
	INT32 c, w = 0;
	INT32 spacewidth = 4, charwidth = 0;
	size_t i;

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 8;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 8;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 6;
		default:
			break;
	}

	for (i = 0; i < strlen(string); i++)
	{
		c = string[i];
		if ((UINT8)c >= 0x80 && (UINT8)c <= 0x89) //color parsing! -Inuyasha 2.16.09
			continue;

		c = toupper(c) - HU_FONTSTART;
		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
			w += spacewidth;
		else
			w += (charwidth ? charwidth : SHORT(hu_font[c]->width));
	}

	return w;
}

//
// Find string width from hu_font chars, 0.5x scale
//
INT32 V_SmallStringWidth(const char *string, INT32 option)
{
	INT32 c, w = 0;
	INT32 spacewidth = 2, charwidth = 0;
	size_t i;

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 4;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 4;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 3;
		default:
			break;
	}

	for (i = 0; i < strlen(string); i++)
	{
		c = string[i];
		if ((UINT8)c >= 0x80 && (UINT8)c <= 0x89) //color parsing! -Inuyasha 2.16.09
			continue;

		c = toupper(c) - HU_FONTSTART;
		if (c < 0 || c >= HU_FONTSIZE || !hu_font[c])
			w += spacewidth;
		else
			w += (charwidth ? charwidth : SHORT(hu_font[c]->width)/2);
	}

	return w;
}

//
// Find string width from tny_font chars
//
INT32 V_ThinStringWidth(const char *string, INT32 option)
{
	INT32 c, w = 0;
	INT32 spacewidth = 2, charwidth = 0;
	size_t i;

	switch (option & V_SPACINGMASK)
	{
		case V_MONOSPACE:
			spacewidth = 5;
			/* FALLTHRU */
		case V_OLDSPACING:
			charwidth = 5;
			break;
		case V_6WIDTHSPACE:
			spacewidth = 3;
		default:
			break;
	}

	for (i = 0; i < strlen(string); i++)
	{
		c = string[i];
		if ((UINT8)c >= 0x80 && (UINT8)c <= 0x89) //color parsing! -Inuyasha 2.16.09
			continue;

		c = toupper(c) - HU_FONTSTART;
		if (c < 0 || c >= HU_FONTSIZE || !tny_font[c])
			w += spacewidth;
		else
			w += (charwidth ? charwidth : SHORT(tny_font[c]->width));
	}

	return w;
}

boolean *heatshifter = NULL;
INT32 lastheight = 0;
INT32 heatindex[2] = { 0, 0 };

//
// V_DoPostProcessor
//
// Perform a particular image postprocessing function.
//
#include "p_local.h"
void V_DoPostProcessor(INT32 view, postimg_t type, INT32 param)
{
#if NUMSCREENS < 5
	// do not enable image post processing for ARM, SH and MIPS CPUs
	(void)view;
	(void)type;
	(void)param;
#else
	INT32 yoffset, xoffset;

#ifdef HWRENDER
	// draw a hardware converted patch
	if (rendermode != render_soft && rendermode != render_none)
		return;
#endif

	if (view < 0 || view > 3 || view > splitscreen)
		return;

	if ((view == 1 && splitscreen == 1) || view >= 2)
		yoffset = viewheight;
	else
		yoffset = 0;

	if ((view == 1 || view == 3) && splitscreen > 1)
		xoffset = viewwidth;
	else
		xoffset = 0;

	if (type == postimg_water)
	{
		UINT8 *tmpscr = screens[4];
		UINT8 *srcscr = screens[0];
		INT32 y;
		angle_t disStart = (leveltime * 128) & FINEMASK; // in 0 to FINEANGLE
		INT32 newpix;
		INT32 sine;
		//UINT8 *transme = transtables + ((tr_trans50-1)<<FF_TRANSSHIFT);

		for (y = yoffset; y < yoffset+viewheight; y++)
		{
			sine = (FINESINE(disStart)*5)>>FRACBITS;
			newpix = abs(sine);

			if (sine < 0)
			{
				M_Memcpy(&tmpscr[(y*vid.width)+xoffset+newpix], &srcscr[(y*vid.width)+xoffset], viewwidth-newpix);

				// Cleanup edge
				while (newpix)
				{
					tmpscr[(y*vid.width)+xoffset+newpix] = srcscr[(y*vid.width)+xoffset];
					newpix--;
				}
			}
			else
			{
				M_Memcpy(&tmpscr[(y*vid.width)+xoffset+0], &srcscr[(y*vid.width)+xoffset+sine], viewwidth-newpix);

				// Cleanup edge
				while (newpix)
				{
					tmpscr[(y*vid.width)+xoffset+viewwidth-newpix] = srcscr[(y*vid.width)+xoffset+(viewwidth-1)];
					newpix--;
				}
			}

/*
Unoptimized version
			for (x = 0; x < vid.width*vid.bpp; x++)
			{
				newpix = (x + sine);

				if (newpix < 0)
					newpix = 0;
				else if (newpix >= vid.width)
					newpix = vid.width-1;

				tmpscr[y*vid.width + x] = srcscr[y*vid.width+newpix]; // *(transme + (srcscr[y*vid.width+x]<<8) + srcscr[y*vid.width+newpix]);
			}*/
			disStart += 22;//the offset into the displacement map, increment each game loop
			disStart &= FINEMASK; //clip it to FINEMASK
		}

		VID_BlitLinearScreen(tmpscr+vid.width*vid.bpp*yoffset+xoffset, screens[0]+vid.width*vid.bpp*yoffset+xoffset,
				viewwidth*vid.bpp, viewheight, vid.width*vid.bpp, vid.width);
	}
	else if (type == postimg_motion) // Motion Blur!
	{
		UINT8 *tmpscr = screens[4];
		UINT8 *srcscr = screens[0];
		INT32 x, y;

		// TODO: Add a postimg_param so that we can pick the translucency level...
		UINT8 *transme = transtables + ((param-1)<<FF_TRANSSHIFT);

		for (y = yoffset; y < yoffset+viewheight; y++)
		{
			for (x = xoffset; x < xoffset+viewwidth; x++)
			{
				tmpscr[y*vid.width + x]
					=     colormaps[*(transme     + (srcscr   [(y*vid.width)+x ] <<8) + (tmpscr[(y*vid.width)+x]))];
			}
		}
		VID_BlitLinearScreen(tmpscr+vid.width*vid.bpp*yoffset+xoffset, screens[0]+vid.width*vid.bpp*yoffset+xoffset,
				viewwidth*vid.bpp, viewheight, vid.width*vid.bpp, vid.width);
	}
	else if (type == postimg_flip) // Flip the screen upside-down
	{
		UINT8 *tmpscr = screens[4];
		UINT8 *srcscr = screens[0];
		INT32 y, y2;

		for (y = yoffset, y2 = yoffset+viewheight - 1; y < yoffset+viewheight; y++, y2--)
			M_Memcpy(&tmpscr[(y2*vid.width)+xoffset], &srcscr[(y*vid.width)+xoffset], viewwidth);

		VID_BlitLinearScreen(tmpscr+vid.width*vid.bpp*yoffset+xoffset, screens[0]+vid.width*vid.bpp*yoffset+xoffset,
				viewwidth*vid.bpp, viewheight, vid.width*vid.bpp, vid.width);
	}
	else if (type == postimg_heat) // Heat wave
	{
		UINT8 *tmpscr = screens[4];
		UINT8 *srcscr = screens[0];
		INT32 y;

		if (splitscreen > 1) // 3P/4P has trouble supporting this, anyone want to fix it? :p
			return;

		// Make sure table is built
		if (heatshifter == NULL || lastheight != viewheight)
		{
			if (heatshifter)
				Z_Free(heatshifter);

			heatshifter = Z_Calloc(viewheight * sizeof(boolean), PU_STATIC, NULL);

			for (y = 0; y < viewheight; y++)
			{
				if (M_RandomChance(FRACUNIT/8)) // 12.5%
					heatshifter[y] = true;
			}

			heatindex[0] = heatindex[1] = 0;
			lastheight = viewheight;
		}

		for (y = yoffset; y < yoffset+viewheight; y++)
		{
			if (heatshifter[heatindex[view]++])
			{
				// Shift this row of pixels to the right by 2
				tmpscr[(y*vid.width)+xoffset] = srcscr[(y*vid.width)+xoffset];
				M_Memcpy(&tmpscr[(y*vid.width)+xoffset], &srcscr[(y*vid.width)+xoffset+vid.dupx], viewwidth-vid.dupx);
			}
			else
				M_Memcpy(&tmpscr[(y*vid.width)+xoffset], &srcscr[(y*vid.width)+xoffset], viewwidth);

			heatindex[view] %= viewheight;
		}

		heatindex[view]++;
		heatindex[view] %= vid.height;

		VID_BlitLinearScreen(tmpscr+vid.width*vid.bpp*yoffset+xoffset, screens[0]+vid.width*vid.bpp*yoffset+xoffset,
				viewwidth*vid.bpp, viewheight, vid.width*vid.bpp, vid.width);
	}
	else if (type == postimg_mirror) // Flip the screen on the x axis
	{
		UINT8 *tmpscr = screens[4];
		UINT8 *srcscr = screens[0];
		INT32 y, x, x2;

		for (y = yoffset; y < yoffset+viewheight; y++)
		{
			for (x = xoffset, x2 = xoffset+((viewwidth*vid.bpp)-1); x < xoffset+(viewwidth*vid.bpp); x++, x2--)
				tmpscr[y*vid.width + x2] = srcscr[y*vid.width + x];
		}

		VID_BlitLinearScreen(tmpscr+vid.width*vid.bpp*yoffset+xoffset, screens[0]+vid.width*vid.bpp*yoffset+xoffset,
				viewwidth*vid.bpp, viewheight, vid.width*vid.bpp, vid.width);
	}
#endif
}

// V_Init
// old software stuff, buffers are allocated at video mode setup
// here we set the screens[x] pointers accordingly
// WARNING: called at runtime (don't init cvar here)
void V_Init(void)
{
	INT32 i;
	UINT8 *base = vid.buffer;
	const INT32 screensize = vid.rowbytes * vid.height;

	LoadMapPalette();
	// hardware modes do not use screens[] pointers
	for (i = 0; i < NUMSCREENS; i++)
		screens[i] = NULL;
	if (rendermode != render_soft)
	{
		return; // be sure to cause a NULL read/write error so we detect it, in case of..
	}

	// start address of NUMSCREENS * width*height vidbuffers
	if (base)
	{
		for (i = 0; i < NUMSCREENS; i++)
			screens[i] = base + i*screensize;
	}

	if (vid.direct)
		screens[0] = vid.direct;

#ifdef DEBUG
	CONS_Debug(DBG_RENDER, "V_Init done:\n");
	for (i = 0; i < NUMSCREENS+1; i++)
		CONS_Debug(DBG_RENDER, " screens[%d] = %x\n", i, screens[i]);
#endif
}