R_DATA.C

// R_data.c

#include "DoomDef.h"
#include "R_local.h"
#include "P_local.h"
#include "deh_main.h" // FS

extern void CheckAbortStartup(void);

typedef struct
{
	int		originx;	// block origin (allways UL), which has allready
	int		originy;	// accounted  for the patch's internal origin
	int		patch;
} texpatch_t;

// a maptexturedef_t describes a rectangular texture, which is composed of one
// or more mappatch_t structures that arrange graphic patches
typedef struct
{
	char		name[8];		// for switch changing, etc
	short		width;
	short		height;
	short		patchcount;
	texpatch_t	patches[1];		// [patchcount] drawn back to front
								//  into the cached texture
} texture_t;



int		firstflat, lastflat, numflats;
int		firstpatch, lastpatch, numpatches;
int		firstspritelump, lastspritelump, numspritelumps;

int			numtextures;
texture_t **textures;
int *texturewidthmask;
fixed_t *textureheight;		// needed for texture pegging
int *texturecompositesize;
short **texturecolumnlump;
unsigned short **texturecolumnofs;
byte **texturecomposite;

int *flattranslation;		// for global animation
int *texturetranslation;	// for global animation

fixed_t *spritewidth;		// needed for pre rendering
fixed_t *spriteoffset;
fixed_t *spritetopoffset;

lighttable_t *colormaps;
extern int		faststart; // FS


/*
==============================================================================

						MAPTEXTURE_T CACHING

when a texture is first needed, it counts the number of composite columns
required in the texture and allocates space for a column directory and any
new columns.  The directory will simply point inside other patches if there
is only one patch in a given column, but any columns with multiple patches
will have new column_ts generated.

==============================================================================
*/

/*
===================
=
= R_DrawColumnInCache
=
= Clip and draw a column from a patch into a cached post
=
===================
*/

void R_DrawColumnInCache (column_t *patch, byte *cache, int originy, int cacheheight)
{
	int		count, position;
	byte *source, *dest;

	dest = (byte *)cache + 3;

	while (patch->topdelta != 0xff)
	{
		source = (byte *)patch + 3;
		count = patch->length;
		position = originy + patch->topdelta;
		if (position < 0)
		{
			count += position;
			position = 0;
		}
		if (position + count > cacheheight)
			count = cacheheight - position;
		if (count > 0)
			memcpy (cache + position, source, count);

		patch = (column_t *)((byte *)patch + patch->length + 4);
	}
}


/*
===================
=
= R_GenerateComposite
=
===================
*/

void R_GenerateComposite (int texnum)
{
	byte *block;
	texture_t *texture;
	texpatch_t *patch;
	patch_t *realpatch;
	int			x, x1, x2;
	int			i;
	column_t *patchcol;
	short *collump;
	unsigned short *colofs;

	texture = textures[texnum];
	block = Z_Malloc (texturecompositesize[texnum], PU_STATIC,
		&texturecomposite[texnum]);
	collump = texturecolumnlump[texnum];
	colofs = texturecolumnofs[texnum];

	//
	// composite the columns together
	//
	patch = texture->patches;

	for (i = 0, patch = texture->patches; i < texture->patchcount; i++, patch++)
	{
		realpatch = W_CacheLumpNum (patch->patch, PU_CACHE);
		x1 = patch->originx;
		x2 = x1 + SHORT(realpatch->width);

		if (x1 < 0)
			x = 0;
		else
			x = x1;
		if (x2 > texture->width)
			x2 = texture->width;

		for (; x < x2; x++)
		{
			if (collump[x] >= 0)
				continue;		// column does not have multiple patches
			patchcol = (column_t *)((byte *)realpatch +
				LONG(realpatch->columnofs[x - x1]));
			R_DrawColumnInCache (patchcol, block + colofs[x], patch->originy,
				texture->height);
		}

	}

	// now that the texture has been built, it is purgable
	Z_ChangeTag (block, PU_CACHE);
}


/*
===================
=
= R_GenerateLookup
=
===================
*/

void R_GenerateLookup (int texnum)
{
	texture_t *texture;
	byte *patchcount;		// [texture->width]
	texpatch_t *patch;
	patch_t *realpatch;
	int			x, x1, x2;
	int			i;
	short *collump;
	unsigned short *colofs;

	texture = textures[texnum];

	texturecomposite[texnum] = 0;	// composited not created yet
	texturecompositesize[texnum] = 0;
	collump = texturecolumnlump[texnum];
	colofs = texturecolumnofs[texnum];

	//
	// count the number of columns that are covered by more than one patch
	// fill in the lump / offset, so columns with only a single patch are
	// all done
	//
	patchcount = (byte *)alloca (texture->width);
	memset (patchcount, 0, texture->width);
	patch = texture->patches;

	for (i = 0, patch = texture->patches; i < texture->patchcount; i++, patch++)
	{
		realpatch = W_CacheLumpNum (patch->patch, PU_CACHE);
		x1 = patch->originx;
		x2 = x1 + SHORT(realpatch->width);
		if (x1 < 0)
			x = 0;
		else
			x = x1;
		if (x2 > texture->width)
			x2 = texture->width;
		for (; x < x2; x++)
		{
			patchcount[x]++;
			collump[x] = patch->patch;
			colofs[x] = LONG(realpatch->columnofs[x - x1]) + 3;
		}
	}

	for (x = 0; x < texture->width; x++)
	{
		if (!patchcount[x])
		{
			printf ("R_GenerateLookup: column without a patch (%s)\n", texture->name);
			return;
		}
		//			I_Error ("R_GenerateLookup: column without a patch");
		if (patchcount[x] > 1)
		{
			collump[x] = -1;	// use the cached block
			colofs[x] = texturecompositesize[texnum];
			if (texturecompositesize[texnum] > 0x10000 - texture->height)
				I_Error ("R_GenerateLookup: texture %i is >64k", texnum);
			texturecompositesize[texnum] += texture->height;
		}
	}
}


/*
================
=
= R_GetColumn
=
================
*/

byte *R_GetColumn (int tex, int col)
{
	int	lump, ofs;

	col &= texturewidthmask[tex];
	lump = texturecolumnlump[tex][col];
	ofs = texturecolumnofs[tex][col];
	if (lump > 0)
		return (byte *)W_CacheLumpNum(lump, PU_CACHE) + ofs;
	if (!texturecomposite[tex])
		R_GenerateComposite (tex);
	return texturecomposite[tex] + ofs;
}


/*
==================
=
= R_InitTextures
=
= Initializes the texture list with the textures from the world map
=
==================
*/

void R_InitTextures (void)
{
	maptexture_t *mtexture;
	texture_t *texture;
	mappatch_t *mpatch;
	texpatch_t *patch;
	int			i, j;
	int *maptex, *maptex2, *maptex1;
	char		name[9], *names, *name_p;
	int *patchlookup;
	int			totalwidth;
	int			nummappatches;
	int			offset, maxoff, maxoff2;
	int			numtextures1, numtextures2;
	int *directory;
	int			temp1, temp2, temp3; // FS: Doom shit

//
// load the patch names from pnames.lmp
//
	name[8] = 0;
	names = W_CacheLumpName ("PNAMES", PU_STATIC);
	nummappatches = LONG (*((int *)names));
	name_p = names + 4;
	patchlookup = alloca (nummappatches * sizeof(*patchlookup));
	for (i = 0; i < nummappatches; i++)
	{
		strncpy (name, name_p + i * 8, 8);
		patchlookup[i] = W_CheckNumForName (name);
	}
	Z_Free (names);

	//
	// load the map texture definitions from textures.lmp
	//
	maptex = maptex1 = W_CacheLumpName ("TEXTURE1", PU_STATIC);
	numtextures1 = LONG(*maptex);
	maxoff = W_LumpLength (W_GetNumForName ("TEXTURE1"));
	directory = maptex + 1;

	if (W_CheckNumForName ("TEXTURE2") != -1)
	{
		maptex2 = W_CacheLumpName ("TEXTURE2", PU_STATIC);
		numtextures2 = LONG(*maptex2);
		maxoff2 = W_LumpLength (W_GetNumForName ("TEXTURE2"));
	}
	else
	{
		maptex2 = NULL;
		numtextures2 = 0;
		maxoff2 = 0;
	}
	numtextures = numtextures1 + numtextures2;

	//
	//	Init the startup thermometer at this point...
	//
	{
		int	spramount;
		spramount = W_GetNumForName("S_END") - W_GetNumForName("S_START") + 1;
		InitThermo(spramount + numtextures + 6);
	}

	textures = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	texturecolumnlump = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	texturecolumnofs = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	texturecomposite = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	texturecompositesize = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	texturewidthmask = Z_Malloc (numtextures * 4, PU_STATIC, 0);
	textureheight = Z_Malloc (numtextures * 4, PU_STATIC, 0);

	totalwidth = 0;

	// FS: Really complex printing shit...
	temp1 = W_GetNumForName (DEH_String("S_START"));  // P_???????
	temp2 = W_GetNumForName (DEH_String("S_END")) - 1;
	temp3 = ((temp2 - temp1 + 63) / 64) + ((numtextures + 63) / 64);
	tprintf("[", 1);
	for (i = 0; i < temp3; i++)
		tprintf(" ", 1);
	tprintf("         ]", 1);
	for (i = 0; i < temp3; i++)
		tprintf("\x8", 1);
	tprintf("\x8\x8\x8\x8\x8\x8\x8\x8\x8\x8", 1);

	for (i = 0; i < numtextures; i++, directory++)
	{
		if (faststart)
		{
			if (!(i & 63))
				tprintf (".", 1);
		}
		else
			IncThermo();

		if (i == numtextures1)
		{	// start looking in second texture file
			maptex = maptex2;
			maxoff = maxoff2;
			directory = maptex + 1;
		}

		offset = LONG(*directory);
		if (offset > maxoff)
			I_Error ("R_InitTextures: bad texture directory");
		mtexture = (maptexture_t *)((byte *)maptex + offset);
		texture = textures[i] = Z_Malloc (sizeof(texture_t)
			+ sizeof(texpatch_t) * (SHORT(mtexture->patchcount) - 1), PU_STATIC,
			0);
		texture->width = SHORT(mtexture->width);
		texture->height = SHORT(mtexture->height);
		texture->patchcount = SHORT(mtexture->patchcount);
		memcpy (texture->name, mtexture->name, sizeof(texture->name));
		mpatch = &mtexture->patches[0];
		patch = &texture->patches[0];
		for (j = 0; j < texture->patchcount; j++, mpatch++, patch++)
		{
			patch->originx = SHORT(mpatch->originx);
			patch->originy = SHORT(mpatch->originy);
			patch->patch = patchlookup[SHORT(mpatch->patch)];
			if (patch->patch == -1)
				I_Error ("R_InitTextures: Missing patch in texture %s", texture->name);
		}
		texturecolumnlump[i] = Z_Malloc (texture->width * 2, PU_STATIC, 0);
		texturecolumnofs[i] = Z_Malloc (texture->width * 2, PU_STATIC, 0);
		j = 1;
		while (j * 2 <= texture->width)
			j <<= 1;
		texturewidthmask[i] = j - 1;
		textureheight[i] = texture->height << FRACBITS;

		totalwidth += texture->width;
	}

	Z_Free (maptex1);
	if (maptex2)
		Z_Free (maptex2);

	//
	// precalculate whatever possible
	//		
	for (i = 0; i < numtextures; i++)
	{
		R_GenerateLookup(i);
		CheckAbortStartup();
	}

	//
	// translation table for global animation
	//
	texturetranslation = Z_Malloc ((numtextures + 1) * 4, PU_STATIC, 0);
	for (i = 0; i < numtextures; i++)
		texturetranslation[i] = i;
}


/*
================
=
= R_InitFlats
=
=================
*/

void R_InitFlats (void)
{
	int		i;

	firstflat = W_GetNumForName ("F_START") + 1;
	lastflat = W_GetNumForName ("F_END") - 1;
	numflats = lastflat - firstflat + 1;

	// translation table for global animation
	flattranslation = Z_Malloc ((numflats + 1) * 4, PU_STATIC, 0);
	for (i = 0; i < numflats; i++)
		flattranslation[i] = i;
}


/*
================
=
= R_InitSpriteLumps
=
= Finds the width and hoffset of all sprites in the wad, so the sprite doesn't
= need to be cached just for the header during rendering
=================
*/

void R_InitSpriteLumps (void)
{
	int		i;
	patch_t *patch;

	firstspritelump = W_GetNumForName ("S_START") + 1;
	lastspritelump = W_GetNumForName ("S_END") - 1;
	numspritelumps = lastspritelump - firstspritelump + 1;
	spritewidth = Z_Malloc (numspritelumps * 4, PU_STATIC, 0);
	spriteoffset = Z_Malloc (numspritelumps * 4, PU_STATIC, 0);
	spritetopoffset = Z_Malloc (numspritelumps * 4, PU_STATIC, 0);

	for (i = 0; i < numspritelumps; i++)
	{
		if (faststart)
		{
			if (!(i & 63))
				tprintf (".", 1);
		}
		else
			IncThermo();

		patch = W_CacheLumpNum (firstspritelump + i, PU_CACHE);
		spritewidth[i] = SHORT(patch->width) << FRACBITS;
		spriteoffset[i] = SHORT(patch->leftoffset) << FRACBITS;
		spritetopoffset[i] = SHORT(patch->topoffset) << FRACBITS;
	}
}


/*
================
=
= R_InitColormaps
=
=================
*/

void R_InitColormaps (void)
{
	int	lump, length;
	//
	// load in the light tables
	// 256 byte align tables
	//
	lump = W_GetNumForName("COLORMAP");
	length = W_LumpLength (lump) + 255;
	colormaps = Z_Malloc (length, PU_STATIC, 0);
	colormaps = (byte *)(((int)colormaps + 255) & ~0xff);
	W_ReadLump (lump, colormaps);
}


/*
================
=
= R_InitData
=
= Locates all the lumps that will be used by all views
= Must be called after W_Init
=================
*/

void R_InitData (void)
{
	R_InitTextures ();
	tprintf (".", 1);

	R_InitFlats ();
	IncThermo();
	tprintf (".", 1);

	R_InitSpriteLumps ();
	IncThermo();
	tprintf (".", 1);
	R_InitColormaps ();
}


//=============================================================================

/*
================
=
= R_FlatNumForName
=
================
*/

int	R_FlatNumForName (char *name)
{
	int		i;
	char	namet[9];

	i = W_CheckNumForName (name);
	if (i == -1)
	{
		namet[8] = 0;
		memcpy (namet, name, 8);
		I_Error ("R_FlatNumForName: %s not found", namet);
	}
	return i - firstflat;
}


/*
================
=
= R_CheckTextureNumForName
=
================
*/

int	R_CheckTextureNumForName (char *name)
{
	int		i;

	if (name[0] == '-')		// no texture marker
		return 0;

	for (i = 0; i < numtextures; i++)
		if (!strncasecmp (textures[i]->name, name, 8))
			return i;

	return -1;
}


/*
================
=
= R_TextureNumForName
=
================
*/

int	R_TextureNumForName (char *name)
{
	int		i;
	//char	namet[9];

	i = R_CheckTextureNumForName (name);
	if (i == -1)
		I_Error ("R_TextureNumForName: %s not found", name);

	return i;
}


/*
=================
=
= R_PrecacheLevel
=
= Preloads all relevent graphics for the level
=================
*/

int		flatmemory, texturememory, spritememory;

void R_PrecacheLevel (void)
{
	char *flatpresent;
	char *texturepresent;
	char *spritepresent;
	int				i, j, k, lump;
	texture_t *texture;
	thinker_t *th;
	spriteframe_t *sf;

	if (demoplayback)
		return;

	//
	// precache flats
	//	
	flatpresent = alloca(numflats);
	memset (flatpresent, 0, numflats);
	for (i = 0; i < numsectors; i++)
	{
		flatpresent[sectors[i].floorpic] = 1;
		flatpresent[sectors[i].ceilingpic] = 1;
	}

	flatmemory = 0;
	for (i = 0; i < numflats; i++)
		if (flatpresent[i])
		{
			lump = firstflat + i;
			flatmemory += lumpinfo[lump].size;
			W_CacheLumpNum(lump, PU_CACHE);
		}

	//
	// precache textures
	//
	texturepresent = alloca(numtextures);
	memset (texturepresent, 0, numtextures);

	for (i = 0; i < numsides; i++)
	{
		texturepresent[sides[i].toptexture] = 1;
		texturepresent[sides[i].midtexture] = 1;
		texturepresent[sides[i].bottomtexture] = 1;
	}

	texturepresent[skytexture] = 1;

	texturememory = 0;
	for (i = 0; i < numtextures; i++)
	{
		if (!texturepresent[i])
			continue;
		texture = textures[i];
		for (j = 0; j < texture->patchcount; j++)
		{
			lump = texture->patches[j].patch;
			texturememory += lumpinfo[lump].size;
			W_CacheLumpNum(lump, PU_CACHE);
		}
	}

	//
	// precache sprites
	//
	spritepresent = alloca(numsprites);
	memset (spritepresent, 0, numsprites);

	for (th = thinkercap.next; th != &thinkercap; th = th->next)
	{
		if (th->function == P_MobjThinker)
			spritepresent[((mobj_t *)th)->sprite] = 1;
	}

	spritememory = 0;
	for (i = 0; i < numsprites; i++)
	{
		if (!spritepresent[i])
			continue;
		for (j = 0; j < sprites[i].numframes; j++)
		{
			sf = &sprites[i].spriteframes[j];
			for (k = 0; k < 8; k++)
			{
				lump = firstspritelump + sf->lump[k];
				spritememory += lumpinfo[lump].size;
				W_CacheLumpNum(lump, PU_CACHE);
			}
		}
	}
}