r_data.c

doom游戏

    int			totalwidth;
    int			nummappatches;
    int			offset;
    int			maxoff;
    int			maxoff2;
    int			numtextures1;
    int			numtextures2;

    int*		directory;
    
    int			temp1;
    int			temp2;
    int			temp3;

    
    // 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);
    //!!printf("patchlookup[%d] = %d", i, patchlookup[i]);
    }
    Z_Free (names);
    
    // Load the map texture definitions from textures.lmp.
    // The data is contained in one or two lumps,
    //  TEXTURE1 for shareware, plus TEXTURE2 for commercial.
    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;
	
    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;
    
    //	Really complex printing shit...
    temp1 = W_GetNumForName ("S_START");  // P_???????
    temp2 = W_GetNumForName ("S_END") - 1;
    temp3 = ((temp2-temp1+63)/64) + ((numtextures+63)/64);
    printf("[");
    for (i = 0; i < temp3; i++)
	printf(" ");
    printf("         ]");
    for (i = 0; i < temp3; i++)
	printf("\x8");
    printf("\x8\x8\x8\x8\x8\x8\x8\x8\x8\x8");	
	
    for (i=0 ; i<numtextures ; i++, directory++)
    {
	if (!(i&63))
	    printf (".");

	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() generates a BUS error on Solaris with optimization on */
#if 0
	_memcpy (texture->name, mtexture->name, sizeof(texture->name));
#else
	{ char *src; char *dst;
	  src = (char *)mtexture->name;
	  dst = (char *)texture->name;
	  for (j=0; j<sizeof(texture->name); ++j )
	    *dst++ = *src++;
	}
#endif
	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)];
        //!!printf("patchlookup[%d], mpatch offset from start=%u", SHORT(mpatch->patch),
        //!!    ((char*)mpatch - (char*)(&mtexture->patches[0])));
	    if (patch->patch == -1)
	    {
		I_Error ("R_InitTextures: Missing patch in texture %s",
			 texture->name);
	    }
        //!!printf("Texture:(%d/%d) %s ", j, texture->patchcount, 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);
    
    // Create 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;
	
    // Create 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 does not need to be cached completely
//  just for having the header info ready 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 (!(i&63))
	    printf (".");

	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 ();
    printf ("\nInitTextures");
    R_InitFlats ();
    printf ("\nInitFlats");
    R_InitSpriteLumps ();
    printf ("\nInitSprites");
    R_InitColormaps ();
    printf ("\nInitColormaps");
}



//
// R_FlatNumForName
// Retrieval, get a flat number for a flat name.
//
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
// Check whether texture is available.
// Filter out NoTexture indicator.
//
int	R_CheckTextureNumForName (char *name)
{
    int		i;

    // "NoTexture" marker.
    if (name[0] == '-')		
	return 0;
		
    for (i=0 ; i<numtextures ; i++)
	if (!I_strncasecmp (textures[i]->name, name, 8) )
	    return i;
		
    return -1;
}



//
// R_TextureNumForName
// Calls R_CheckTextureNumForName,
//  aborts with error message.
//
int	R_TextureNumForName (char* name)
{
    int		i;
	
    i = R_CheckTextureNumForName (name);

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




//
// R_PrecacheLevel
// Preloads all relevant graphics for the level.
//
int		flatmemory;
int		texturememory;
int		spritememory;

void R_PrecacheLevel (void)
{
    char*		flatpresent;
    char*		texturepresent;
    char*		spritepresent;

    int			i;
    int			j;
    int			k;
    int			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;
    }

    // Sky texture is always present.
    // Note that F_SKY1 is the name used to
    //  indicate a sky floor/ceiling as a flat,
    //  while the sky texture is stored like
    //  a wall texture, with an episode dependend
    //  name.
    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.acp1 == (actionf_p1)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);
	    }
	}
    }
}