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/******************************************************************************
Plush Version 1.2
read_3ds.c
3DS Object Reader
Copyright (c) 1996-2000, Justin Frankel
******************************************************************************/
#include "plush.h"
typedef struct {
pl_uInt16 id;
void (*func)(FILE *f, pl_uInt32 p);
} _pl_3DSChunk;
static pl_Obj *obj;
static pl_Obj *bobj;
static pl_Obj *lobj;
static pl_sInt16 currentobj;
static pl_Mat *_m;
static pl_Float _pl3DSReadFloat(FILE *f);
static pl_uInt32 _pl3DSReadDWord(FILE *f);
static pl_uInt16 _pl3DSReadWord(FILE *f);
static void _pl3DSChunkReader(FILE *f, pl_uInt32 p);
static void _pl3DSRGBFReader(FILE *f, pl_uInt32 p);
static void _pl3DSRGBBReader(FILE *f, pl_uInt32 p);
static void _pl3DSASCIIZReader(FILE *f, pl_uInt32 p, char *as);
static void _pl3DSObjBlockReader(FILE *f, pl_uInt32 p);
static void _pl3DSTriMeshReader(FILE *f, pl_uInt32 p);
static void _pl3DSVertListReader(FILE *f, pl_uInt32 p);
static void _pl3DSFaceListReader(FILE *f, pl_uInt32 p);
static void _pl3DSFaceMatReader(FILE *f, pl_uInt32 p);
static void MapListReader(FILE *f, pl_uInt32 p);
static pl_sInt16 _pl3DSFindChunk(pl_uInt16 id);
static _pl_3DSChunk _pl3DSChunkNames[] = {
{0x4D4D,NULL}, /* Main */
{0x3D3D,NULL}, /* Object Mesh */
{0x4000,_pl3DSObjBlockReader},
{0x4100,_pl3DSTriMeshReader},
{0x4110,_pl3DSVertListReader},
{0x4120,_pl3DSFaceListReader},
{0x4130,_pl3DSFaceMatReader},
{0x4140,MapListReader},
{0xAFFF,NULL}, /* Material */
{0xA010,NULL}, /* Ambient */
{0xA020,NULL}, /* Diff */
{0xA030,NULL}, /* Specular */
{0xA200,NULL}, /* Texture */
{0x0010,_pl3DSRGBFReader},
{0x0011,_pl3DSRGBBReader},
};
pl_Obj *plRead3DSObj(char *fn, pl_Mat *m) {
FILE *f;
pl_uInt32 p;
_m = m;
obj = bobj = lobj = 0;
currentobj = 0;
f = fopen(fn, "rb");
if (!f) return 0;
fseek(f, 0, 2);
p = ftell(f);
rewind(f);
_pl3DSChunkReader(f, p);
fclose(f);
return bobj;
}
static pl_Float _pl3DSReadFloat(FILE *f) {
pl_uInt32 *i;
pl_IEEEFloat32 c;
i = (pl_uInt32 *) &c;
*i = _pl3DSReadDWord(f);
return ((pl_Float) c);
}
static pl_uInt32 _pl3DSReadDWord(FILE *f) {
pl_uInt32 r;
r = fgetc(f);
r |= fgetc(f)<<8;
r |= fgetc(f)<<16;
r |= fgetc(f)<<24;
return r;
}
static pl_uInt16 _pl3DSReadWord(FILE *f) {
pl_uInt16 r;
r = fgetc(f);
r |= fgetc(f)<<8;
return r;
}
static void _pl3DSRGBFReader(FILE *f, pl_uInt32 p) {
pl_Float c[3];
c[0] = _pl3DSReadFloat(f);
c[1] = _pl3DSReadFloat(f);
c[2] = _pl3DSReadFloat(f);
}
static void _pl3DSRGBBReader(FILE *f, pl_uInt32 p) {
unsigned char c[3];
if (fread(&c, sizeof(c), 1, f) != 1) return;
}
static void _pl3DSASCIIZReader(FILE *f, pl_uInt32 p, char *as) {
char c;
if (!as) while ((c = fgetc(f)) != EOF && c != '\0');
else {
while ((c = fgetc(f)) != EOF && c != '\0') *as++ = c;
*as = 0;
}
}
static void _pl3DSObjBlockReader(FILE *f, pl_uInt32 p) {
_pl3DSASCIIZReader(f,p,0);
_pl3DSChunkReader(f, p);
}
static void _pl3DSTriMeshReader(FILE *f, pl_uInt32 p) {
pl_uInt32 i;
pl_Face *face;
obj = plObjCreate(0,0);
_pl3DSChunkReader(f, p);
i = obj->NumFaces;
face = obj->Faces;
while (i--) {
face->Vertices[0] = obj->Vertices + (pl_uInt32) face->Vertices[0];
face->Vertices[1] = obj->Vertices + (pl_uInt32) face->Vertices[1];
face->Vertices[2] = obj->Vertices + (pl_uInt32) face->Vertices[2];
face->MappingU[0] = face->Vertices[0]->xformedx;
face->MappingV[0] = face->Vertices[0]->xformedy;
face->MappingU[1] = face->Vertices[1]->xformedx;
face->MappingV[1] = face->Vertices[1]->xformedy;
face->MappingU[2] = face->Vertices[2]->xformedx;
face->MappingV[2] = face->Vertices[2]->xformedy;
face++;
}
plObjCalcNormals(obj);
if (currentobj == 0) {
currentobj = 1;
lobj = bobj = obj;
} else {
lobj->Children[0] = obj;
lobj = obj;
}
}
static void _pl3DSVertListReader(FILE *f, pl_uInt32 p) {
pl_uInt16 nv;
pl_Vertex *v;
nv = _pl3DSReadWord(f);
obj->NumVertices = nv;
v = obj->Vertices = (pl_Vertex *) calloc(sizeof(pl_Vertex)*nv,1);
while (nv--) {
v->x = _pl3DSReadFloat(f);
v->y = _pl3DSReadFloat(f);
v->z = _pl3DSReadFloat(f);
if (feof(f)) return;
v++;
}
}
static void _pl3DSFaceListReader(FILE *f, pl_uInt32 p) {
pl_uInt16 nv;
pl_uInt16 c[3];
pl_uInt16 flags;
pl_Face *face;
nv = _pl3DSReadWord(f);
obj->NumFaces = nv;
face = obj->Faces = (pl_Face *) calloc(sizeof(pl_Face)*nv,1);
while (nv--) {
c[0] = _pl3DSReadWord(f);
c[1] = _pl3DSReadWord(f);
c[2] = _pl3DSReadWord(f);
flags = _pl3DSReadWord(f);
if (feof(f)) return;
face->Vertices[0] = (pl_Vertex *) (c[0]&0x0000FFFF);
face->Vertices[1] = (pl_Vertex *) (c[1]&0x0000FFFF);
face->Vertices[2] = (pl_Vertex *) (c[2]&0x0000FFFF);
face->Material = _m;
face++;
}
_pl3DSChunkReader(f, p);
}
static void _pl3DSFaceMatReader(FILE *f, pl_uInt32 p) {
pl_uInt16 n, nf;
_pl3DSASCIIZReader(f, p,0);
n = _pl3DSReadWord(f);
while (n--) {
nf = _pl3DSReadWord(f);
}
}
static void MapListReader(FILE *f, pl_uInt32 p) {
pl_uInt16 nv;
pl_Float c[2];
pl_Vertex *v;
nv = _pl3DSReadWord(f);
v = obj->Vertices;
if (nv == obj->NumVertices) while (nv--) {
c[0] = _pl3DSReadFloat(f);
c[1] = _pl3DSReadFloat(f);
if (feof(f)) return;
v->xformedx = (pl_sInt32) (c[0]*65536.0);
v->xformedy = (pl_sInt32) (c[1]*65536.0);
v++;
}
}
static pl_sInt16 _pl3DSFindChunk(pl_uInt16 id) {
pl_sInt16 i;
for (i = 0; i < sizeof(_pl3DSChunkNames)/sizeof(_pl3DSChunkNames[0]); i++)
if (id == _pl3DSChunkNames[i].id) return i;
return -1;
}
static void _pl3DSChunkReader(FILE *f, pl_uInt32 p) {
pl_uInt32 hlen;
pl_uInt16 hid;
pl_sInt16 n;
pl_uInt32 pc;
while (ftell(f) < (int)p) {
pc = ftell(f);
hid = _pl3DSReadWord(f); if (feof(f)) return;
hlen = _pl3DSReadDWord(f); if (feof(f)) return;
if (hlen == 0) return;
n = _pl3DSFindChunk(hid);
if (n < 0) fseek(f, pc + hlen, 0);
else {
pc += hlen;
if (_pl3DSChunkNames[n].func != NULL) _pl3DSChunkNames[n].func(f, pc);
else _pl3DSChunkReader(f, pc);
fseek(f, pc, 0);
}
if (ferror(f)) break;
}
}
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