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f0743d593b
OpenSubdiv/regression/common/shape_utils.cpp
manuelk f0743d593b Add parsing ability for OBJ material format to regression/shape_utils 
- add simple parsing function to the Shape class
- only a small portion of the MTL format is supported (no textures)
- the feature is disabled by default
- this work is incomplete : we still need to add piping to the GPU
2015-01-22 11:08:13 -08:00

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//
// Copyright 2013 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "shape_utils.h"
#include <cassert>
#include <cstdio>
#include <cstring>
#include <iterator>
#include <fstream>
#include <sstream>
//------------------------------------------------------------------------------
static char const * sgets( char * s, int size, char ** stream ) {
for (int i=0; i<size; ++i) {
if ( (*stream)[i]=='\n' or (*stream)[i]=='\0') {
memcpy(s, *stream, i);
s[i]='\0';
if ((*stream)[i]=='\0')
return 0;
else {
(*stream) += i+1;
return s;
}
}
}
return 0;
}
//------------------------------------------------------------------------------
Shape::~Shape() {
for (int i=0; i<(int)tags.size(); ++i)
delete tags[i];
for (int i=0; i<(int)mtls.size(); ++i)
delete mtls[i];
}
//------------------------------------------------------------------------------
Shape * Shape::parseObj(char const * shapestr, Scheme shapescheme, int axis, bool parsemtl) {
Shape * s = new Shape;
s->scheme = shapescheme;
char * str=const_cast<char *>(shapestr), line[256], buf[256], usemtl=-1;
bool done = false;
while (not done) {
done = sgets(line, sizeof(line), &str)==0;
char* end = &line[strlen(line)-1];
if (*end == '\n') *end = '\0'; // strip trailing nl
float x, y, z, u, v;
switch (line[0]) {
case 'v': switch (line[1]) {
case ' ': if (sscanf(line, "v %f %f %f", &x, &y, &z) == 3) {
s->verts.push_back(x);
switch( axis ) {
case 0 : s->verts.push_back(-z);
s->verts.push_back(y); break;
case 1 : s->verts.push_back(y);
s->verts.push_back(z); break;
}
} break;
case 't': if (sscanf(line, "vt %f %f", &u, &v) == 2) {
s->uvs.push_back(u);
s->uvs.push_back(v);
} break;
case 'n' : if (sscanf(line, "vn %f %f %f", &x, &y, &z) == 3) {
s->normals.push_back(x);
s->normals.push_back(y);
s->normals.push_back(z);
} break; // skip normals for now
} break;
case 'f': if (line[1] == ' ') {
int vi, ti, ni;
const char* cp = &line[2];
while (*cp == ' ') cp++;
int nverts = 0, nitems=0;
while( (nitems=sscanf(cp, "%d/%d/%d", &vi, &ti, &ni))>0) {
nverts++;
s->faceverts.push_back(vi-1);
if(nitems >= 1) s->faceuvs.push_back(ti-1);
if(nitems >= 2) s->facenormals.push_back(ni-1);
while (*cp && *cp != ' ') cp++;
while (*cp == ' ') cp++;
}
s->nvertsPerFace.push_back(nverts);
if (not s->mtls.empty()) {
s->mtlbind.push_back(usemtl);
}
} break;
case 't' : if (line[1] == ' ') {
Shape::tag * t = tag::parseTag( line );
if (t)
s->tags.push_back(t);
} break;
case 'u' : if (parsemtl and sscanf(line, "usemtl %s", buf)==1) {
usemtl = s->FindMaterial(buf);
} break;
case 'm' : if (parsemtl and sscanf(line, "mtllib %s", buf)==1) {
std::ifstream ifs(buf);
if (ifs) {
std::stringstream ss;
ss << ifs.rdbuf();
ifs.close();
std::string str = ss.str();
s->parseMtllib(str.c_str());
s->mtllib = buf;
}
} break;
}
}
return s;
}
//------------------------------------------------------------------------------
Shape::tag * Shape::tag::parseTag(char const * line) {
tag * t = 0;
const char* cp = &line[2];
char tname[50];
while (*cp == ' ') cp++;
if (sscanf(cp, "%s", tname )!=1) return t;
while (*cp && *cp != ' ') cp++;
int nints=0, nfloats=0, nstrings=0;
while (*cp == ' ') cp++;
if (sscanf(cp, "%d/%d/%d", &nints, &nfloats, &nstrings)!=3) return t;
while (*cp && *cp != ' ') cp++;
std::vector<int> tintargs;
for (int i=0; i<nints; ++i) {
int val;
while (*cp == ' ') cp++;
if (sscanf(cp, "%d", &val)!=1) return t;
tintargs.push_back(val);
while (*cp && *cp != ' ') cp++;
}
std::vector<float> tfloatargs;
for (int i=0; i<nfloats; ++i) {
float val;
while (*cp == ' ') cp++;
if (sscanf(cp, "%f", &val)!=1) return t;
tfloatargs.push_back(val);
while (*cp && *cp != ' ') cp++;
}
std::vector<std::string> tstringargs;
for (int i=0; i<nstrings; ++i) {
char val[512];
while (*cp == ' ') cp++;
if (sscanf(cp, "%s", val)!=1) return t;
tstringargs.push_back(std::string(val));
while (*cp && *cp != ' ') cp++;
}
t = new Shape::tag;
t->name = tname;
t->intargs = tintargs;
t->floatargs = tfloatargs;
t->stringargs = tstringargs;
return t;
}
//------------------------------------------------------------------------------
Shape::material::material() {
memset(ka, 0, sizeof(float)*3);
memset(kd, 0, sizeof(float)*3);
memset(ks, 0, sizeof(float)*3);
memset(tf, 0, sizeof(float)*3);
ns = ni = d = 0.0f;
illum=0;
}
//------------------------------------------------------------------------------
void Shape::parseMtllib(char const * mtlstr) {
char * str=const_cast<char *>(mtlstr), line[256];
material * mtl=0;
bool done = false;
float r, g, b, a;
while (not done) {
done = sgets(line, sizeof(line), &str)==0;
char* end = &line[strlen(line)-1];
if (*end == '\n') *end = '\0'; // strip trailing nl
switch (line[0]) {
case 'n': char name[256];
if (sscanf(line, "newmtl %s", name) == 1) {
mtl = new material;
mtl->name = name;
mtls.push_back(mtl);
} break;
case 'K': if (sscanf(line+2, " %f %f %f", &r, &g, &b) == 3) {
switch (line[1]) {
case 'a': mtl->ka[0]=r; mtl->ka[1]=g; mtl->ka[2]=b; break;
case 'd': mtl->kd[0]=r; mtl->kd[1]=g; mtl->kd[2]=b; break;
case 's': mtl->ks[0]=r; mtl->ks[1]=g; mtl->ks[2]=b; break;
}
} break;
case 'N': if (sscanf(line+2, " %f", &a) == 1) {
switch (line[1]) {
case 's' : mtl->ns = a; break;
case 'i' : mtl->ni = a; break;
}
} break;
case 'd': if (sscanf(line, "d %f", &a) == 1) {
mtl->d = a;
} break;
case 'T': if (line[1]=='f') {
if (sscanf(line, "Tf %f %f %f", &r, &g, &b) == 3) {
mtl->tf[0]=r; mtl->tf[1]=g; mtl->tf[2]=b;
} break;
} break;
case 'i': int illum;
if (sscanf(line, "illum %d", &illum) == 1) {
mtl->illum = illum;
} break;
case 's': if (sscanf(line, "sharpness %f", &a) == 1) {
mtl->sharpness = a;
} break;
}
}
}
//------------------------------------------------------------------------------
std::string Shape::tag::genTag() const {
std::stringstream t;
t<<"\"t \""<<name<<"\" ";
t<<intargs.size()<<"/"<<floatargs.size()<<"/"<<stringargs.size()<<" ";
std::copy(intargs.begin(), intargs.end(), std::ostream_iterator<int>(t));
t<<" ";
std::copy(floatargs.begin(), floatargs.end(), std::ostream_iterator<float>(t));
t<<" ";
std::copy(stringargs.begin(), stringargs.end(), std::ostream_iterator<std::string>(t));
t<<"\\n\"\n";
return t.str();
}
//------------------------------------------------------------------------------
std::string Shape::genShape(char const * name) const {
std::stringstream sh;
sh<<"static char const * "<<name<<" = \n";
for (int i=0; i<(int)verts.size(); i+=3)
sh << "\"v " << verts[i] << " " << verts[i+1] << " " << verts[i+2] <<"\\n\"\n";
for (int i=0; i<(int)uvs.size(); i+=2)
sh << "\"vt " << uvs[i] << " " << uvs[i+1] << "\\n\"\n";
for (int i=0; i<(int)normals.size(); i+=3)
sh << "\"vn " << normals[i] << " " << normals[i+1] << " " << normals[i+2] <<"\\n\"\n";
sh << "\"s off\\n\"\n";
for (int i=0, idx=0; i<(int)nvertsPerFace.size();++i) {
sh << "\"f ";
for (int j=0; j<nvertsPerFace[i];++j) {
int vert = faceverts[idx+j]+1,
uv = (int)faceuvs.size()>0 ? faceuvs[idx+j]+1 : vert,
normal = (int)facenormals.size()>0 ? facenormals[idx+j]+1 : vert;
sh << vert << "/" << uv << "/" << normal << " ";
}
sh << "\\n\"\n";
idx+=nvertsPerFace[i];
}
for (int i=0; i<(int)tags.size(); ++i)
sh << tags[i]->genTag();
return sh.str();
}
//------------------------------------------------------------------------------
std::string Shape::genObj() const {
std::stringstream sh;
sh<<"# This file uses centimeters as units for non-parametric coordinates.\n\n";
for (int i=0; i<(int)verts.size(); i+=3)
sh << "v " << verts[i] << " " << verts[i+1] << " " << verts[i+2] <<"\n";
for (int i=0; i<(int)uvs.size(); i+=2)
sh << "vt " << uvs[i] << " " << uvs[i+1] << "\n";
for (int i=0; i<(int)normals.size(); i+=3)
sh << "vn " << normals[i] << " " << normals[i+1] << " " << normals[i+2] <<"\n";
for (int i=0, idx=0; i<(int)nvertsPerFace.size();++i) {
sh << "f ";
for (int j=0; j<nvertsPerFace[i];++j) {
int vert = faceverts[idx+j]+1,
uv = (int)faceuvs.size()>0 ? faceuvs[idx+j]+1 : vert,
normal = (int)facenormals.size()>0 ? facenormals[idx+j]+1 : vert;
sh << vert << "/" << uv << "/" << normal << " ";
}
sh << "\n";
idx+=nvertsPerFace[i];
}
for (int i=0; i<(int)tags.size(); ++i)
sh << tags[i]->genTag();
return sh.str();
}
//------------------------------------------------------------------------------
std::string Shape::genRIB() const {
std::stringstream rib;
rib << "HierarchicalSubdivisionMesh \"catmull-clark\" ";
rib << "[";
std::copy(nvertsPerFace.begin(), nvertsPerFace.end(), std::ostream_iterator<int>(rib));
rib << "] ";
rib << "[";
std::copy(faceverts.begin(), faceverts.end(), std::ostream_iterator<int>(rib));
rib << "] ";
std::stringstream names, nargs, intargs, floatargs, strargs;
for (int i=0; i<(int)tags.size();) {
tag * t = tags[i];
names << t->name;
nargs << t->intargs.size() << " " << t->floatargs.size() << " " << t->stringargs.size();
std::copy(t->intargs.begin(), t->intargs.end(), std::ostream_iterator<int>(intargs));
std::copy(t->floatargs.begin(), t->floatargs.end(), std::ostream_iterator<float>(floatargs));
std::copy(t->stringargs.begin(), t->stringargs.end(), std::ostream_iterator<std::string>(strargs));
if (++i<(int)tags.size()) {
names << " ";
nargs << " ";
intargs << " ";
floatargs << " ";
strargs << " ";
}
}
rib << "["<<names.str()<<"] " << "["<<nargs.str()<<"] " << "["<<intargs.str()<<"] " << "["<<floatargs.str()<<"] " << "["<<strargs.str()<<"] ";
rib << "\"P\" [";
std::copy(verts.begin(), verts.end(), std::ostream_iterator<float>(rib));
rib << "] ";
return rib.str();
}
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