ref: a141f4c53a32d8227f9a490a8e4f7d87445c47d1
dir: /sys/src/games/doom/r_data.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// Revision 1.3 1997/01/29 20:10
// DESCRIPTION:
// Preparation of data for rendering,
// generation of lookups, caching, retrieval by name.
//
//-----------------------------------------------------------------------------
static const char
rcsid[] = "$Id: r_data.c,v 1.4 1997/02/03 16:47:55 b1 Exp $";
#include "i_system.h"
#include "z_zone.h"
#include "m_swap.h"
#include "w_wad.h"
#include "doomdef.h"
#include "r_local.h"
#include "p_local.h"
#include "doomstat.h"
#include "r_sky.h"
#ifdef LINUX
#include <alloca.h>
#endif
#include "r_data.h"
//
// Graphics.
// DOOM graphics for walls and sprites
// is stored in vertical runs of opaque pixels (posts).
// A column is composed of zero or more posts,
// a patch or sprite is composed of zero or more columns.
//
#pragma pack on
/* Texture definition.
** Each texture is composed of one or more patches,
** with patches being lumps stored in the WAD.
** The lumps are referenced by number, and patched
** into the rectangular texture space using origin
** and possibly other attributes.
*/
typedef struct
{
short originx;
short originy;
short patch;
short stepdir;
short colormap;
} mappatch_t;
/* Texture definition.
** A DOOM wall texture is a list of patches
** which are to be combined in a predefined order.
*/
typedef struct
{
char name[8];
boolean masked;
short width;
short height;
long columndirectory; // OBSOLETE
short patchcount;
mappatch_t patches[1];
} maptexture_t;
#pragma pack off
/* A single patch from a texture definition,
** basically a rectangular area within
** the texture rectangle.
*/
typedef struct
{
/* Block origin (allways UL),
** which has allready accounted
** for the internal origin of the patch.
*/
int originx;
int originy;
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
{
/* Keep name for switch changing, etc. */
char name[8];
short width;
short height;
/* All the patches[patchcount]
** are drawn back to front into the cached texture.
*/
short patchcount;
texpatch_t patches[1];
} texture_t;
int firstflat;
int lastflat;
int numflats;
int firstpatch;
int lastpatch;
int numpatches;
int firstspritelump;
int lastspritelump;
int numspritelumps;
int numtextures;
texture_t** textures;
int* texturewidthmask;
// needed for texture pegging
fixed_t* textureheight;
int* texturecompositesize;
short** texturecolumnlump;
unsigned short** texturecolumnofs;
byte** texturecomposite;
// for global animation
int* flattranslation;
int* texturetranslation;
// needed for pre rendering
fixed_t* spritewidth;
fixed_t* spriteoffset;
fixed_t* spritetopoffset;
lighttable_t *colormaps;
//
// 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;
int position;
byte* source;
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
// Using the texture definition,
// the composite texture is created from the patches,
// and each column is cached.
//
void R_GenerateComposite (int texnum)
{
byte* block;
texture_t* texture;
texpatch_t* patch;
patch_t* realpatch;
int x;
int x1;
int 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.
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++)
{
// Column does not have multiple patches?
if (collump[x] >= 0)
continue;
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 in column cache,
// it is purgable from zone memory.
Z_ChangeTag (block, PU_CACHE);
}
//
// R_GenerateLookup
//
void R_GenerateLookup (int texnum)
{
texture_t* texture;
byte* patchcount; // patchcount[texture->width]
byte* freepatchcount;
texpatch_t* patch;
patch_t* realpatch;
int x;
int x1;
int x2;
int i;
short* collump;
unsigned short* colofs;
texture = textures[texnum];
// Composited texture not created yet.
texturecomposite[texnum] = 0;
texturecompositesize[texnum] = 0;
collump = texturecolumnlump[texnum];
colofs = texturecolumnofs[texnum];
// Now 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 = freepatchcount = (byte *)malloc (texture->width);
memset (patchcount, 0, texture->width);
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);
goto alloca_exit;
}
// I_Error ("R_GenerateLookup: column without a patch");
if (patchcount[x] > 1)
{
// Use the cached block.
collump[x] = -1;
colofs[x] = texturecompositesize[texnum];
if (texturecompositesize[texnum] > 0x10000-texture->height)
{
I_Error ("R_GenerateLookup: texture %i is >64k",
texnum);
}
texturecompositesize[texnum] += texture->height;
}
}
alloca_exit:
if(freepatchcount)
free(freepatchcount);
}
//
// R_GetColumn
//
byte*
R_GetColumn
( int tex,
int col )
{
int lump;
int 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;
int j;
int* maptex;
int* maptex2;
int* maptex1;
char name[9];
char* names;
char* name_p;
int* patchlookup;
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 = malloc (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.
// 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*sizeof(void*), PU_STATIC, 0);
texturecolumnlump = Z_Malloc (numtextures*sizeof(void*), PU_STATIC, 0);
texturecolumnofs = Z_Malloc (numtextures*sizeof(void*), PU_STATIC, 0);
texturecomposite = Z_Malloc (numtextures*sizeof(void*), PU_STATIC, 0);
texturecompositesize = Z_Malloc (numtextures*sizeof(int), PU_STATIC, 0);
texturewidthmask = Z_Malloc (numtextures*sizeof(int), PU_STATIC, 0);
textureheight = Z_Malloc (numtextures*sizeof(fixed_t), 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 (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*sizeof(short), PU_STATIC,0);
texturecolumnofs[i] = Z_Malloc (texture->width*sizeof(short), 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)*sizeof(int), PU_STATIC, 0);
for (i=0 ; i<numtextures ; i++)
texturetranslation[i] = i;
free(patchlookup);
}
//
// 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)*sizeof(int), 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*sizeof(fixed_t), PU_STATIC, 0);
spriteoffset = Z_Malloc (numspritelumps*sizeof(fixed_t), PU_STATIC, 0);
spritetopoffset = Z_Malloc (numspritelumps*sizeof(fixed_t), 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 *)( ((uintptr)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 (!cistrncmp (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 = malloc(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 = malloc(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 = malloc(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);
}
}
}
free(spritepresent);
free(texturepresent);
free(flatpresent);
}