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struct md3;
struct md3frame
{
vec bbmin, bbmax, origin;
float radius;
uchar name[16];
};
struct md3tag
{
char name[64];
vec pos;
float rotation[3][3];
};
struct md3vertex
{
short vertex[3];
short normal;
};
struct md3triangle
{
int vertexindices[3];
};
struct md3header
{
char id[4];
int version;
char name[64];
int flags;
int numframes, numtags, nummeshes, numskins;
int ofs_frames, ofs_tags, ofs_meshes, ofs_eof; // offsets
};
struct md3meshheader
{
char id[4];
char name[64];
int flags;
int numframes, numshaders, numvertices, numtriangles;
int ofs_triangles, ofs_shaders, ofs_uv, ofs_vertices, meshsize; // offsets
};
struct md3 : vertmodel, vertloader<md3>
{
md3(const char *name) : vertmodel(name) {}
static const char *formatname() { return "md3"; }
int type() const { return MDL_MD3; }
struct md3meshgroup : vertmeshgroup
{
bool load(const char *path)
{
stream *f = openfile(path, "rb");
if(!f) return false;
md3header header;
f->read(&header, sizeof(md3header));
lilswap(&header.version, 1);
lilswap(&header.flags, 9);
if(strncmp(header.id, "IDP3", 4) != 0 || header.version != 15) // header check
{
delete f;
conoutf("md3: corrupted header");
return false;
}
name = newstring(path);
numframes = header.numframes;
int mesh_offset = header.ofs_meshes;
loopi(header.nummeshes)
{
vertmesh &m = *new vertmesh;
m.group = this;
meshes.add(&m);
md3meshheader mheader;
f->seek(mesh_offset, SEEK_SET);
f->read(&mheader, sizeof(md3meshheader));
lilswap(&mheader.flags, 10);
m.name = newstring(mheader.name);
m.numtris = mheader.numtriangles;
m.tris = new tri[m.numtris];
f->seek(mesh_offset + mheader.ofs_triangles, SEEK_SET);
loopj(m.numtris)
{
md3triangle tri;
f->read(&tri, sizeof(md3triangle)); // read the triangles
lilswap(tri.vertexindices, 3);
loopk(3) m.tris[j].vert[k] = (ushort)tri.vertexindices[k];
}
m.numverts = mheader.numvertices;
m.tcverts = new tcvert[m.numverts];
f->seek(mesh_offset + mheader.ofs_uv , SEEK_SET);
f->read(m.tcverts, m.numverts*2*sizeof(float)); // read the UV data
lilswap(&m.tcverts[0].u, 2*m.numverts);
m.verts = new vert[numframes*m.numverts];
f->seek(mesh_offset + mheader.ofs_vertices, SEEK_SET);
loopj(numframes*m.numverts)
{
md3vertex v;
f->read(&v, sizeof(md3vertex)); // read the vertices
lilswap(v.vertex, 4);
m.verts[j].pos.x = v.vertex[0]/64.0f;
m.verts[j].pos.y = -v.vertex[1]/64.0f;
m.verts[j].pos.z = v.vertex[2]/64.0f;
float lng = (v.normal&0xFF)*PI2/255.0f; // decode vertex normals
float lat = ((v.normal>>8)&0xFF)*PI2/255.0f;
m.verts[j].norm.x = cosf(lat)*sinf(lng);
m.verts[j].norm.y = -sinf(lat)*sinf(lng);
m.verts[j].norm.z = cosf(lng);
}
mesh_offset += mheader.meshsize;
}
numtags = header.numtags;
if(numtags)
{
tags = new tag[numframes*numtags];
f->seek(header.ofs_tags, SEEK_SET);
md3tag tag;
loopi(header.numframes*header.numtags)
{
f->read(&tag, sizeof(md3tag));
lilswap(&tag.pos.x, 12);
if(tag.name[0] && i<header.numtags) tags[i].name = newstring(tag.name);
matrix3x4 &m = tags[i].transform;
tag.pos.y *= -1;
// undo the -y
loopj(3) tag.rotation[1][j] *= -1;
// then restore it
loopj(3) tag.rotation[j][1] *= -1;
m.a.w = tag.pos.x;
m.b.w = tag.pos.y;
m.c.w = tag.pos.z;
loopj(3)
{
m.a[j] = tag.rotation[j][0];
m.b[j] = tag.rotation[j][1];
m.c[j] = tag.rotation[j][2];
}
#if 0
tags[i].pos = vec(tag.pos.x, -tag.pos.y, tag.pos.z);
memcpy(tags[i].transform, tag.rotation, sizeof(tag.rotation));
// undo the -y
loopj(3) tags[i].transform[1][j] *= -1;
// then restore it
loopj(3) tags[i].transform[j][1] *= -1;
#endif
}
}
delete f;
return true;
}
};
meshgroup *loadmeshes(const char *name, va_list args)
{
md3meshgroup *group = new md3meshgroup;
if(!group->load(name)) { delete group; return NULL; }
return group;
}
bool loaddefaultparts()
{
const char *pname = parentdir(loadname);
part &mdl = *new part;
parts.add(&mdl);
mdl.model = this;
mdl.index = 0;
defformatstring(name1)("packages/models/%s/tris.md3", loadname);
mdl.meshes = sharemeshes(path(name1));
if(!mdl.meshes)
{
defformatstring(name2)("packages/models/%s/tris.md3", pname); // try md3 in parent folder (vert sharing)
mdl.meshes = sharemeshes(path(name2));
if(!mdl.meshes) return false;
}
Texture *tex, *masks;
loadskin(loadname, pname, tex, masks);
mdl.initskins(tex, masks);
if(tex==notexture) conoutf("could not load model skin for %s", name1);
return true;
}
bool load()
{
if(loaded) return true;
formatstring(dir)("packages/models/%s", loadname);
defformatstring(cfgname)("packages/models/%s/md3.cfg", loadname);
loading = this;
identflags &= ~IDF_PERSIST;
if(execfile(cfgname, false) && parts.length()) // configured md3, will call the md3* commands below
{
identflags |= IDF_PERSIST;
loading = NULL;
loopv(parts) if(!parts[i]->meshes) return false;
}
else // md3 without configuration, try default tris and skin
{
identflags |= IDF_PERSIST;
loading = NULL;
if(!loaddefaultparts()) return false;
}
scale /= 4;
translate.y = -translate.y;
parts[0]->translate = translate;
loopv(parts) parts[i]->meshes->shared++;
return loaded = true;
}
};
vertcommands<md3> md3commands;
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