void C3DOParser::GetPrimitives(S3DOPiece* obj, int pos, int num, int excludePrim, const std::vector<unsigned char>& fileBuf)
{
std::map<int,int> prevHashes;
for (int a=0; a<num; a++) {
if (a == excludePrim) {
continue;
}
_Primitive p;
int curOffset = pos + a * sizeof(_Primitive);
READ_PRIMITIVE(p, fileBuf, curOffset);
if (p.NumberOfVertexIndexes < 3)
continue;
S3DOPrimitive sp;
sp.indices.resize(p.NumberOfVertexIndexes);
sp.vnormals.resize(p.NumberOfVertexIndexes);
// load vertex indices list
curOffset = p.OffsetToVertexIndexArray;
for (int b=0; b<p.NumberOfVertexIndexes; b++) {
boost::uint16_t w;
STREAM_READ(&w,2, fileBuf, curOffset);
swabWordInPlace(w);
sp.indices[b] = w;
}
// find texture
sp.texture = GetTexture(obj, &p, fileBuf);
// set the primitive-normal
const float3 v0v1 = (obj->vertexPos[sp.indices[1]] - obj->vertexPos[sp.indices[0]]);
const float3 v0v2 = (obj->vertexPos[sp.indices[2]] - obj->vertexPos[sp.indices[0]]);
sp.primNormal = (-v0v1.cross(v0v2)).SafeANormalize();
// some 3dos got multiple baseplates a.k.a. `selection primitive`
// it's not meant to be rendered, so hide it
if (IsBasePlate(obj, &sp))
continue;
// 3do has often duplicated faces (with equal geometry)
// with different textures (e.g. for animations and other effects)
// we don't support those, only render the last one
std::vector<int> orderVert = sp.indices;
std::sort(orderVert.begin(), orderVert.end());
const int vertHash = HsiehHash(&orderVert[0], orderVert.size() * sizeof(orderVert[0]), 0x123456);
auto phi = prevHashes.find(vertHash);
if (phi != prevHashes.end()) {
obj->prims[phi->second] = sp;
continue;
}
prevHashes[vertHash] = obj->prims.size();
obj->prims.push_back(sp);
}
}
// used only by ReadInfoMap (for unitsync)
void CSMFMapFile::ReadHeightmap(unsigned short* heightmap)
{
const int hmx = header.mapx + 1;
const int hmy = header.mapy + 1;
ifs.Seek(header.heightmapPtr);
ifs.Read(heightmap, hmx * hmy * sizeof(short));
for (int y = 0; y < hmx * hmy; ++y) {
swabWordInPlace(heightmap[y]);
}
}
