PtexWriter* PtexWriter::edit(const char* path, bool incremental,
Ptex::MeshType mt, Ptex::DataType dt,
int nchannels, int alphachan, int nfaces,
Ptex::String& error, bool genmipmaps)
{
if (!checkFormat(mt, dt, nchannels, alphachan, error))
return 0;
// try to open existing file (it might not exist)
FILE* fp = fopen(path, "rb+");
if (!fp && errno != ENOENT) {
error = fileError("Can't open ptex file for update: ", path).c_str();
}
PtexWriterBase* w = 0;
// use incremental writer iff incremental mode requested and file exists
if (incremental && fp) {
w = new PtexIncrWriter(path, fp, mt, dt, nchannels, alphachan, nfaces);
}
// otherwise use main writer
else {
PtexTexture* tex = 0;
if (fp) {
// got an existing file, close and reopen with PtexReader
fclose(fp);
// open reader for existing file
tex = PtexTexture::open(path, error);
if (!tex) return 0;
// make sure header matches
bool headerMatch = (mt == tex->meshType() &&
dt == tex->dataType() &&
nchannels == tex->numChannels() &&
alphachan == tex->alphaChannel() &&
nfaces == tex->numFaces());
if (!headerMatch) {
std::stringstream str;
str << "PtexWriter::edit error: header doesn't match existing file, "
<< "conversions not currently supported";
error = str.str().c_str();
return 0;
}
}
w = new PtexMainWriter(path, tex, mt, dt, nchannels, alphachan,
nfaces, genmipmaps);
}
if (!w->ok(error)) {
w->release();
return 0;
}
return w;
}
bool PtexWriter::applyEdits(const char* path, Ptex::String& error)
{
// open reader for existing file
PtexTexture* tex = PtexTexture::open(path, error);
if (!tex) return 0;
// see if we have any edits to apply
if (tex->hasEdits()) {
// create non-incremental writer
PtexWriter* w = new PtexMainWriter(path, tex, tex->meshType(), tex->dataType(),
tex->numChannels(), tex->alphaChannel(), tex->numFaces(),
tex->hasMipMaps());
// close to rebuild file
if (!w->close(error)) return 0;
w->release();
}
return 1;
}
