R_DRAW.C

// R_draw.c

#include "DoomDef.h"
#include "R_local.h"

/*

All drawing to the view buffer is accomplished in this file.  The other refresh
files only know about ccordinates, not the architecture of the frame buffer.

*/

byte *viewimage;
int viewwidth, scaledviewwidth, viewheight, viewwindowx, viewwindowy;
byte *ylookup[MAXHEIGHT];
int columnofs[MAXWIDTH];
byte translations[3][256]; // color tables for different players
byte *tinttable; // used for translucent sprites

/*
==================
=
= R_DrawColumn
=
= Source is the top of the column to scale
=
==================
*/

lighttable_t *dc_colormap;
int				dc_x;
int				dc_yl;
int				dc_yh;
fixed_t			dc_iscale;
fixed_t			dc_texturemid;
byte *dc_source;		// first pixel in a column (possibly virtual)

int				dccount;		// just for profiling

#ifndef __WATCOMC__
#ifndef __i386
#ifndef __m68k
void R_DrawColumn (void)
{
	int			count;
	byte *dest;
	fixed_t		frac, fracstep;

	count = dc_yh - dc_yl;
	if (count < 0)
		return;

#ifdef RANGECHECK
	if ((unsigned)dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
		I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif

	dest = ylookup[dc_yl] + columnofs[dc_x];

	fracstep = dc_iscale;
	frac = dc_texturemid + (dc_yl - centery) * fracstep;

	do
	{
		*dest = dc_colormap[dc_source[(frac >> FRACBITS) & 127]];
		dest += SCREENWIDTH;
		frac += fracstep;
	} while (count--);
}
#endif		// __m68k
#endif		// __i386
#endif

void R_DrawColumnLow (void)
{
	int			count;
	byte *dest;
	fixed_t		frac, fracstep;

	count = dc_yh - dc_yl;
	if (count < 0)
		return;

#ifdef RANGECHECK
	if ((unsigned)dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
		I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
	//	dccount++;
#endif

	dest = ylookup[dc_yl] + columnofs[dc_x];

	fracstep = dc_iscale;
	frac = dc_texturemid + (dc_yl - centery) * fracstep;

	do
	{
		*dest = dc_colormap[dc_source[(frac >> FRACBITS) & 127]];
		dest += SCREENWIDTH;
		frac += fracstep;
	} while (count--);
}


#define FUZZTABLE	50

#define FUZZOFF	(SCREENWIDTH)
int		fuzzoffset[FUZZTABLE] = {
FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF
};
int fuzzpos = 0;

void R_DrawFuzzColumn (void)
{
	int			count;
	byte *dest;
	fixed_t		frac, fracstep;

	if (!dc_yl)
		dc_yl = 1;
	if (dc_yh == viewheight - 1)
		dc_yh = viewheight - 2;

	count = dc_yh - dc_yl;
	if (count < 0)
		return;

#ifdef RANGECHECK
	if ((unsigned)dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
		I_Error ("R_DrawFuzzColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif

	dest = ylookup[dc_yl] + columnofs[dc_x];

	fracstep = dc_iscale;
	frac = dc_texturemid + (dc_yl - centery) * fracstep;

	// OLD FUZZY INVISO SPRITE STUFF
	/*	do
		{
			*dest = colormaps[6*256+dest[fuzzoffset[fuzzpos]]];
			if (++fuzzpos == FUZZTABLE)
				fuzzpos = 0;
			dest += SCREENWIDTH;
			frac += fracstep;
		} while (count--);
	*/

	do
	{
		*dest = tinttable[((*dest) << 8) + dc_colormap[dc_source[(frac >> FRACBITS) & 127]]];

		//*dest = dest[SCREENWIDTH*10+5];

//		*dest = //tinttable[((*dest)<<8)+colormaps[dc_source[(frac>>FRACBITS)&127]]];

//		*dest = dc_colormap[dc_source[(frac>>FRACBITS)&127]];
		dest += SCREENWIDTH;
		frac += fracstep;
	} while (count--);
}

/*
========================
=
= R_DrawTranslatedColumn
=
========================
*/

byte *dc_translation;
byte *translationtables;

void R_DrawTranslatedColumn (void)
{
	int			count;
	byte *dest;
	fixed_t		frac, fracstep;

	count = dc_yh - dc_yl;
	if (count < 0)
		return;

#ifdef RANGECHECK
	if ((unsigned)dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
		I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif

	dest = ylookup[dc_yl] + columnofs[dc_x];

	fracstep = dc_iscale;
	frac = dc_texturemid + (dc_yl - centery) * fracstep;

	do
	{
		*dest = dc_colormap[dc_translation[dc_source[frac >> FRACBITS]]];
		dest += SCREENWIDTH;
		frac += fracstep;
	} while (count--);
}

void R_DrawTranslatedFuzzColumn (void)
{
	int			count;
	byte *dest;
	fixed_t		frac, fracstep;

	count = dc_yh - dc_yl;
	if (count < 0)
		return;

#ifdef RANGECHECK
	if ((unsigned)dc_x >= SCREENWIDTH || dc_yl < 0 || dc_yh >= SCREENHEIGHT)
		I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
#endif

	dest = ylookup[dc_yl] + columnofs[dc_x];

	fracstep = dc_iscale;
	frac = dc_texturemid + (dc_yl - centery) * fracstep;

	do
	{
		*dest = tinttable[((*dest) << 8)
			+ dc_colormap[dc_translation[dc_source[frac >> FRACBITS]]]];
		dest += SCREENWIDTH;
		frac += fracstep;
	} while (count--);
}

//--------------------------------------------------------------------------
//
// PROC R_InitTranslationTables
//
//--------------------------------------------------------------------------

void R_InitTranslationTables (void)
{
	int i;

	// Load tint table
	tinttable = W_CacheLumpName("TINTTAB", PU_STATIC);

	// Allocate translation tables
	translationtables = Z_Malloc(256 * 3 + 255, PU_STATIC, 0);
	translationtables = (byte *)(((int)translationtables + 255) & ~255);

	// Fill out the translation tables
	for (i = 0; i < 256; i++)
	{
		if (i >= 225 && i <= 240)
		{
			translationtables[i] = 114 + (i - 225); // yellow
			translationtables[i + 256] = 145 + (i - 225); // red
			translationtables[i + 512] = 190 + (i - 225); // blue
		}
		else
		{
			translationtables[i] = translationtables[i + 256]
				= translationtables[i + 512] = i;
		}
	}
}

/*
================
=
= R_DrawSpan
=
================
*/

int				ds_y;
int				ds_x1;
int				ds_x2;
lighttable_t *ds_colormap;
fixed_t			ds_xfrac;
fixed_t			ds_yfrac;
fixed_t			ds_xstep;
fixed_t			ds_ystep;
byte *ds_source;		// start of a 64*64 tile image

int				dscount;		// just for profiling

#ifndef __WATCOMC__
#ifndef __i386
#ifndef __m68k
void R_DrawSpan (void)
{
	fixed_t		xfrac, yfrac;
	byte *dest;
	int			count, spot;

#ifdef RANGECHECK
	if (ds_x2 < ds_x1 || ds_x1<0 || ds_x2 >= SCREENWIDTH
		|| (unsigned)ds_y>SCREENHEIGHT)
		I_Error ("R_DrawSpan: %i to %i at %i", ds_x1, ds_x2, ds_y);
	//	dscount++;
#endif

	xfrac = ds_xfrac;
	yfrac = ds_yfrac;

	dest = ylookup[ds_y] + columnofs[ds_x1];
	count = ds_x2 - ds_x1;
	do
	{
		spot = ((yfrac >> (16 - 6)) & (63 * 64)) + ((xfrac >> 16) & 63);
		*dest++ = ds_colormap[ds_source[spot]];
		xfrac += ds_xstep;
		yfrac += ds_ystep;
	} while (count--);
}
#endif
#endif
#endif

void R_DrawSpanLow (void)
{
	fixed_t		xfrac, yfrac;
	byte *dest;
	int			count, spot;

#ifdef RANGECHECK
	if (ds_x2 < ds_x1 || ds_x1<0 || ds_x2 >= SCREENWIDTH
		|| (unsigned)ds_y>SCREENHEIGHT)
		I_Error ("R_DrawSpan: %i to %i at %i", ds_x1, ds_x2, ds_y);
	//	dscount++;
#endif

	xfrac = ds_xfrac;
	yfrac = ds_yfrac;

	dest = ylookup[ds_y] + columnofs[ds_x1];
	count = ds_x2 - ds_x1;
	do
	{
		spot = ((yfrac >> (16 - 6)) & (63 * 64)) + ((xfrac >> 16) & 63);
		*dest++ = ds_colormap[ds_source[spot]];
		xfrac += ds_xstep;
		yfrac += ds_ystep;
	} while (count--);
}



/*
================
=
= R_InitBuffer
=
=================
*/

void R_InitBuffer (int width, int height)
{
	int		i;

	viewwindowx = (SCREENWIDTH - width) >> 1;
	for (i = 0; i < width; i++)
		columnofs[i] = viewwindowx + i;
	if (width == SCREENWIDTH)
		viewwindowy = 0;
	else
		viewwindowy = (SCREENHEIGHT - SBARHEIGHT - height) >> 1;
	for (i = 0; i < height; i++)
		ylookup[i] = screen + (i + viewwindowy) * SCREENWIDTH;
}


/*
==================
=
= R_DrawViewBorder
=
= Draws the border around the view for different size windows
==================
*/

boolean BorderNeedRefresh;

void R_DrawViewBorder (void)
{
	byte *src, *dest;
	int		x, y;

	if (scaledviewwidth == SCREENWIDTH)
		return;

	if (shareware)
	{
		src = W_CacheLumpName ("FLOOR04", PU_CACHE);
	}
	else
	{
		src = W_CacheLumpName ("FLAT513", PU_CACHE);
	}
	dest = screen;

	for (y = 0; y < SCREENHEIGHT - SBARHEIGHT; y++)
	{
		for (x = 0; x < SCREENWIDTH / 64; x++)
		{
			memcpy (dest, src + ((y & 63) << 6), 64);
			dest += 64;
		}
		if (SCREENWIDTH & 63)
		{
			memcpy (dest, src + ((y & 63) << 6), SCREENWIDTH & 63);
			dest += (SCREENWIDTH & 63);
		}
	}
	for (x = viewwindowx; x < viewwindowx + viewwidth; x += 16)
	{
		V_DrawPatch(x, viewwindowy - 4, W_CacheLumpName("bordt", PU_CACHE));
		V_DrawPatch(x, viewwindowy + viewheight, W_CacheLumpName("bordb",
			PU_CACHE));
	}
	for (y = viewwindowy; y < viewwindowy + viewheight; y += 16)
	{
		V_DrawPatch(viewwindowx - 4, y, W_CacheLumpName("bordl", PU_CACHE));
		V_DrawPatch(viewwindowx + viewwidth, y, W_CacheLumpName("bordr",
			PU_CACHE));
	}
	V_DrawPatch(viewwindowx - 4, viewwindowy - 4, W_CacheLumpName("bordtl",
		PU_CACHE));
	V_DrawPatch(viewwindowx + viewwidth, viewwindowy - 4,
		W_CacheLumpName("bordtr", PU_CACHE));
	V_DrawPatch(viewwindowx + viewwidth, viewwindowy + viewheight,
		W_CacheLumpName("bordbr", PU_CACHE));
	V_DrawPatch(viewwindowx - 4, viewwindowy + viewheight,
		W_CacheLumpName("bordbl", PU_CACHE));
}

/*
==================
=
= R_DrawTopBorder
=
= Draws the top border around the view for different size windows
==================
*/

boolean BorderTopRefresh;

void R_DrawTopBorder (void)
{
	byte *src, *dest;
	int		x, y;

	if (scaledviewwidth == SCREENWIDTH)
		return;

	if (shareware)
	{
		src = W_CacheLumpName ("FLOOR04", PU_CACHE);
	}
	else
	{
		src = W_CacheLumpName ("FLAT513", PU_CACHE);
	}
	dest = screen;

	for (y = 0; y < 30; y++)
	{
		for (x = 0; x < SCREENWIDTH / 64; x++)
		{
			memcpy (dest, src + ((y & 63) << 6), 64);
			dest += 64;
		}
		if (SCREENWIDTH & 63)
		{
			memcpy (dest, src + ((y & 63) << 6), SCREENWIDTH & 63);
			dest += (SCREENWIDTH & 63);
		}
	}
	if (viewwindowy < 25)
	{
		for (x = viewwindowx; x < viewwindowx + viewwidth; x += 16)
		{
			V_DrawPatch(x, viewwindowy - 4, W_CacheLumpName("bordt", PU_CACHE));
		}
		V_DrawPatch(viewwindowx - 4, viewwindowy, W_CacheLumpName("bordl",
			PU_CACHE));
		V_DrawPatch(viewwindowx + viewwidth, viewwindowy,
			W_CacheLumpName("bordr", PU_CACHE));
		V_DrawPatch(viewwindowx - 4, viewwindowy + 16, W_CacheLumpName("bordl",
			PU_CACHE));
		V_DrawPatch(viewwindowx + viewwidth, viewwindowy + 16,
			W_CacheLumpName("bordr", PU_CACHE));

		V_DrawPatch(viewwindowx - 4, viewwindowy - 4, W_CacheLumpName("bordtl",
			PU_CACHE));
		V_DrawPatch(viewwindowx + viewwidth, viewwindowy - 4,
			W_CacheLumpName("bordtr", PU_CACHE));
	}
}