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essence-os/apps/doom/r_data.c

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//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// DESCRIPTION:
// Preparation of data for rendering,
// generation of lookups, caching, retrieval by name.
//
#include "essence/include.h"
#include "i_swap.h"
#include "i_system.h"
#include "z_zone.h"
#include "w_wad.h"
#include "doomdef.h"
#include "m_misc.h"
#include "r_local.h"
#include "p_local.h"
#include "doomstat.h"
#include "r_sky.h"
#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.
//
//
// 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;
} PACKEDATTR 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];
int masked;
short width;
short height;
int obsolete;
short patchcount;
mappatch_t patches[1];
} PACKEDATTR maptexture_t;
// 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.
short originx;
short 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 texture_s texture_t;
struct texture_s
{
// Keep name for switch changing, etc.
char name[8];
short width;
short height;
// Index in textures list
int index;
// Next in hash table chain
texture_t *next;
// All the patches[patchcount]
// are drawn back to front into the cached texture.
short patchcount;
texpatch_t patches[1];
};
int firstflat;
int lastflat;
int numflats;
int firstpatch;
int lastpatch;
int numpatches;
int firstspritelump;
int lastspritelump;
int numspritelumps;
size_t numtextures = 0;
texture_t** textures;
texture_t** textures_hashtable;
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)
ES_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.
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++)
{
// 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]
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 = (byte *) Z_Malloc(texture->width, PU_STATIC, &patchcount);
ES_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])
{
ES_debugf("R_GenerateLookup: column without a patch (%s)\n",
texture->name);
return;
}
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;
}
}
Z_Free(patchcount);
}
//
// 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;
}
static void GenerateTextureHashTable(void)
{
texture_t **rover;
int i;
int key;
textures_hashtable
= Z_Malloc(sizeof(texture_t *) * numtextures, PU_STATIC, 0);
ES_memset(textures_hashtable, 0, sizeof(texture_t *) * numtextures);
// Add all textures to hash table
for (i=0; i<numtextures; ++i)
{
// Store index
textures[i]->index = i;
// Vanilla Doom does a linear search of the texures array
// and stops at the first entry it finds. If there are two
// entries with the same name, the first one in the array
// wins. The new entry must therefore be added at the end
// of the hash chain, so that earlier entries win.
key = W_LumpNameHash(textures[i]->name) % numtextures;
rover = &textures_hashtable[key];
while (*rover != NULL)
{
rover = &(*rover)->next;
}
// Hook into hash table
textures[i]->next = NULL;
*rover = textures[i];
}
}
//
// 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;
size_t 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 = *(uint32_t*)names;
name_p = names + 4;
patchlookup = Z_Malloc(nummappatches * sizeof(*patchlookup), PU_STATIC, NULL);
for (i = 0; i < nummappatches; i++)
{
M_StringCopy(name, name_p + i * 8, sizeof(name));
patchlookup[i] = W_CheckNumForName(name);
if (patchlookup[i] == -1)
{
ES_warnf("R_InitTextures: Name not found %.9s\n", name);
}
}
W_ReleaseLumpName("PNAMES");
// 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 = *maptex;
maxoff = W_LumpLength (W_GetNumForName ("TEXTURE1"));
directory = maptex+1;
if (W_CheckNumForName ("TEXTURE2") != -1)
{
maptex2 = W_CacheLumpName ("TEXTURE2", PU_STATIC);
numtextures2 = *maptex2;
maxoff2 = W_LumpLength (W_GetNumForName ("TEXTURE2"));
}
else
{
maptex2 = NULL;
numtextures2 = 0;
maxoff2 = 0;
}
numtextures = numtextures1 + numtextures2;
textures = Z_Malloc (numtextures * sizeof(*textures), PU_STATIC, 0);
texturecolumnlump = Z_Malloc (numtextures * sizeof(*texturecolumnlump), PU_STATIC, 0);
texturecolumnofs = Z_Malloc (numtextures * sizeof(*texturecolumnofs), PU_STATIC, 0);
texturecomposite = Z_Malloc (numtextures * sizeof(*texturecomposite), PU_STATIC, 0);
texturecompositesize = Z_Malloc (numtextures * sizeof(*texturecompositesize), PU_STATIC, 0);
texturewidthmask = Z_Malloc (numtextures * sizeof(*texturewidthmask), PU_STATIC, 0);
textureheight = Z_Malloc (numtextures * sizeof(*textureheight), 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);
for (i=0; i < numtextures; i++, directory++)
{
if (i == numtextures1)
{
// Start looking in second texture file.
maptex = maptex2;
maxoff = maxoff2;
directory = maptex+1;
}
offset = *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)*(mtexture->patchcount-1),
PU_STATIC, 0);
texture->width = mtexture->width;
texture->height = mtexture->height;
texture->patchcount = mtexture->patchcount;
ES_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++)
{
if (mpatch->patch >= nummappatches) {
I_Error (
"R_InitTexture: Out of bounds patch in texture %.8s (max_patches=%d)",
texture->name,
texture->patchcount
);
}
patch->originx = mpatch->originx;
patch->originy = mpatch->originy;
patch->patch = patchlookup[mpatch->patch];
if (patch->patch == -1 || patch->patch > numlumps)
{
I_Error ("R_InitTextures: Invalid patch in texture %.8s", texture->name);
}
}
texturecolumnlump[i] = Z_Malloc (texture->width*sizeof(**texturecolumnlump), PU_STATIC,0);
texturecolumnofs[i] = Z_Malloc (texture->width*sizeof(**texturecolumnofs), 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(patchlookup);
W_ReleaseLumpName("TEXTURE1");
if (maptex2)
W_ReleaseLumpName("TEXTURE2");
// Precalculate whatever possible.
for (i=0 ; i<numtextures; i++) R_GenerateLookup(i);
// Create translation table for global animation.
texturetranslation = Z_Malloc ((numtextures+1)*sizeof(*texturetranslation), PU_STATIC, 0);
for (i=0 ; i<numtextures ; i++) texturetranslation[i] = i;
GenerateTextureHashTable();
}
//
// 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(*flattranslation), 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(*spritewidth), PU_STATIC, 0);
spriteoffset = Z_Malloc (numspritelumps*sizeof(*spriteoffset), PU_STATIC, 0);
spritetopoffset = Z_Malloc (numspritelumps*sizeof(*spritetopoffset), PU_STATIC, 0);
for (i=0; i< numspritelumps; i++)
{
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;
// Load in the light tables,
// 256 byte align tables.
lump = W_GetNumForName("COLORMAP");
colormaps = W_CacheLumpNum(lump, PU_STATIC);
}
//
// R_InitData
// Locates all the lumps
// that will be used by all views
// Must be called after W_Init.
//
void R_InitData (void)
{
ES_debugf("R_InitData: Texture\n");
R_InitTextures ();
ES_debugf("R_InitData: Flags\n");
R_InitFlats ();
ES_debugf("R_InitData: Sprite Lumps\n");
R_InitSpriteLumps ();
ES_debugf("R_InitData: Colormaps\n");
R_InitColormaps ();
}
//
// 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;
ES_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)
{
texture_t *texture;
int key;
// "NoTexture" marker.
if (name[0] == '-')
return 0;
key = W_LumpNameHash(name) % numtextures;
texture=textures_hashtable[key];
while (texture != NULL)
{
if (!ES_strncasecmp (texture->name, name, 8) )
return texture->index;
texture = texture->next;
}
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 = Z_Malloc(numflats, PU_STATIC, NULL);
ES_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);
}
}
Z_Free(flatpresent);
// Precache textures.
texturepresent = Z_Malloc(numtextures, PU_STATIC, NULL);
ES_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);
}
}
Z_Free(texturepresent);
// Precache sprites.
spritepresent = Z_Malloc(numsprites, PU_STATIC, NULL);
ES_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);
}
}
}
Z_Free(spritepresent);
}
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