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https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-08 21:30:06 +00:00
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
This commit is contained in:
manuelk
parent
5e0c13f188
commit
f0743d593b
@ -25,9 +25,11 @@
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#include "shape_utils.h"
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#include <cassert>
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#include <cstdio>
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#include <cstring>
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#include <iterator>
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#include <fstream>
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#include <sstream>
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//------------------------------------------------------------------------------
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@ -53,66 +55,83 @@ static char const * sgets( char * s, int size, char ** stream ) {
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Shape::~Shape() {
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for (int i=0; i<(int)tags.size(); ++i)
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delete tags[i];
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for (int i=0; i<(int)mtls.size(); ++i)
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delete mtls[i];
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}
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//------------------------------------------------------------------------------
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Shape * Shape::parseObj(char const * shapestr, Scheme shapescheme, int axis ) {
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Shape * Shape::parseObj(char const * shapestr, Scheme shapescheme, int axis, bool parsemtl) {
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Shape * s = new Shape;
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s->scheme = shapescheme;
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char * str=const_cast<char *>(shapestr), line[256];
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char * str=const_cast<char *>(shapestr), line[256], buf[256], usemtl=-1;
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bool done = false;
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while( not done )
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{ done = sgets(line, sizeof(line), &str)==0;
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while (not done) {
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done = sgets(line, sizeof(line), &str)==0;
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char* end = &line[strlen(line)-1];
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if (*end == '\n') *end = '\0'; // strip trailing nl
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float x, y, z, u, v;
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switch (line[0]) {
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case 'v': switch (line[1])
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{ case ' ': if(sscanf(line, "v %f %f %f", &x, &y, &z) == 3) {
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s->verts.push_back(x);
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switch( axis ) {
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case 0 : s->verts.push_back(-z);
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s->verts.push_back(y); break;
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case 1 : s->verts.push_back(y);
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s->verts.push_back(z); break;
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}
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} break;
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case 't': if(sscanf(line, "vt %f %f", &u, &v) == 2) {
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s->uvs.push_back(u);
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s->uvs.push_back(v);
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} break;
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case 'n' : if(sscanf(line, "vn %f %f %f", &x, &y, &z) == 3) {
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s->normals.push_back(x);
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s->normals.push_back(y);
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s->normals.push_back(z);
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case 'v': switch (line[1]) {
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case ' ': if (sscanf(line, "v %f %f %f", &x, &y, &z) == 3) {
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s->verts.push_back(x);
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switch( axis ) {
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case 0 : s->verts.push_back(-z);
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s->verts.push_back(y); break;
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case 1 : s->verts.push_back(y);
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s->verts.push_back(z); break;
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}
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break; // skip normals for now
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}
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break;
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case 'f': if(line[1] == ' ') {
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int vi, ti, ni;
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const char* cp = &line[2];
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} break;
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case 't': if (sscanf(line, "vt %f %f", &u, &v) == 2) {
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s->uvs.push_back(u);
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s->uvs.push_back(v);
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} break;
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case 'n' : if (sscanf(line, "vn %f %f %f", &x, &y, &z) == 3) {
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s->normals.push_back(x);
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s->normals.push_back(y);
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s->normals.push_back(z);
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} break; // skip normals for now
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} break;
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case 'f': if (line[1] == ' ') {
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int vi, ti, ni;
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const char* cp = &line[2];
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while (*cp == ' ') cp++;
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int nverts = 0, nitems=0;
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while( (nitems=sscanf(cp, "%d/%d/%d", &vi, &ti, &ni))>0) {
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nverts++;
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s->faceverts.push_back(vi-1);
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if(nitems >= 1) s->faceuvs.push_back(ti-1);
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if(nitems >= 2) s->facenormals.push_back(ni-1);
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while (*cp && *cp != ' ') cp++;
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while (*cp == ' ') cp++;
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int nverts = 0, nitems=0;
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while( (nitems=sscanf(cp, "%d/%d/%d", &vi, &ti, &ni))>0) {
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nverts++;
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s->faceverts.push_back(vi-1);
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if(nitems >= 1) s->faceuvs.push_back(ti-1);
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if(nitems >= 2) s->facenormals.push_back(ni-1);
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while (*cp && *cp != ' ') cp++;
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while (*cp == ' ') cp++;
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}
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s->nvertsPerFace.push_back(nverts);
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}
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break;
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case 't' : if(line[1] == ' ') {
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s->nvertsPerFace.push_back(nverts);
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if (not s->mtls.empty()) {
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s->mtlbind.push_back(usemtl);
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}
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} break;
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case 't' : if (line[1] == ' ') {
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Shape::tag * t = tag::parseTag( line );
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if (t)
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s->tags.push_back(t);
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} break;
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case 'u' : if (parsemtl and sscanf(line, "usemtl %s", buf)==1) {
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usemtl = s->FindMaterial(buf);
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} break;
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case 'm' : if (parsemtl and sscanf(line, "mtllib %s", buf)==1) {
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std::ifstream ifs(buf);
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if (ifs) {
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std::stringstream ss;
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ss << ifs.rdbuf();
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ifs.close();
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std::string str = ss.str();
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s->parseMtllib(str.c_str());
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s->mtllib = buf;
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}
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} break;
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}
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}
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return s;
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@ -170,6 +189,68 @@ Shape::tag * Shape::tag::parseTag(char const * line) {
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return t;
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}
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//------------------------------------------------------------------------------
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Shape::material::material() {
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memset(ka, 0, sizeof(float)*3);
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memset(kd, 0, sizeof(float)*3);
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memset(ks, 0, sizeof(float)*3);
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memset(tf, 0, sizeof(float)*3);
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ns = ni = d = 0.0f;
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illum=0;
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}
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//------------------------------------------------------------------------------
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void Shape::parseMtllib(char const * mtlstr) {
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char * str=const_cast<char *>(mtlstr), line[256];
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material * mtl=0;
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bool done = false;
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float r, g, b, a;
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while (not done) {
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done = sgets(line, sizeof(line), &str)==0;
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char* end = &line[strlen(line)-1];
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if (*end == '\n') *end = '\0'; // strip trailing nl
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switch (line[0]) {
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case 'n': char name[256];
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if (sscanf(line, "newmtl %s", name) == 1) {
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mtl = new material;
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mtl->name = name;
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mtls.push_back(mtl);
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} break;
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case 'K': if (sscanf(line+2, " %f %f %f", &r, &g, &b) == 3) {
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switch (line[1]) {
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case 'a': mtl->ka[0]=r; mtl->ka[1]=g; mtl->ka[2]=b; break;
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case 'd': mtl->kd[0]=r; mtl->kd[1]=g; mtl->kd[2]=b; break;
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case 's': mtl->ks[0]=r; mtl->ks[1]=g; mtl->ks[2]=b; break;
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}
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} break;
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case 'N': if (sscanf(line+2, " %f", &a) == 1) {
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switch (line[1]) {
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case 's' : mtl->ns = a; break;
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case 'i' : mtl->ni = a; break;
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}
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} break;
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case 'd': if (sscanf(line, "d %f", &a) == 1) {
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mtl->d = a;
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} break;
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case 'T': if (line[1]=='f') {
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if (sscanf(line, "Tf %f %f %f", &r, &g, &b) == 3) {
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mtl->tf[0]=r; mtl->tf[1]=g; mtl->tf[2]=b;
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} break;
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} break;
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case 'i': int illum;
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if (sscanf(line, "illum %d", &illum) == 1) {
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mtl->illum = illum;
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} break;
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case 's': if (sscanf(line, "sharpness %f", &a) == 1) {
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mtl->sharpness = a;
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} break;
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}
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}
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}
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//------------------------------------------------------------------------------
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std::string Shape::tag::genTag() const {
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std::stringstream t;
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@ -27,6 +27,7 @@
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#include <string>
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#include <vector>
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#include <map>
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//------------------------------------------------------------------------------
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enum Scheme {
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@ -38,10 +39,28 @@ enum Scheme {
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//------------------------------------------------------------------------------
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struct Shape {
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// full(er) spec here: http://paulbourke.net/dataformats/mtl/
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struct material {
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material();
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std::string name;
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float ka[3], // ambient
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kd[3], // diffuse
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ks[3], // specular
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ns, // specular exponent
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ni, // optical density (1.0=no refraction, glass=1.5)
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sharpness, // reflection sharpness
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tf[3], // transimission filter
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d; // dissolve factor (1.0 = opaque)
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int illum;
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};
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struct tag {
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static tag * parseTag( char const * stream );
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static tag * parseTag(char const * stream);
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std::string genTag() const;
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@ -51,7 +70,10 @@ struct Shape {
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std::vector<std::string> stringargs;
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};
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static Shape * parseObj(char const * Shapestr, Scheme schme, int axis=1);
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static Shape * parseObj(char const * Shapestr, Scheme schme,
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int axis=1, bool parsemtl=false);
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void parseMtllib(char const * stream);
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std::string genShape(char const * name) const;
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@ -64,20 +86,33 @@ struct Shape {
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int GetNumVertices() const { return (int)verts.size()/3; }
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int GetNumFaces() const { return (int)nvertsPerFace.size(); }
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bool HasUV() const { return not (uvs.empty() or faceuvs.empty()); }
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int GetFVarWidth() const { return HasUV() ? 2 : 0; }
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std::vector<float> verts;
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std::vector<float> uvs;
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std::vector<float> normals;
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std::vector<int> nvertsPerFace;
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std::vector<int> faceverts;
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std::vector<int> faceuvs;
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std::vector<int> facenormals;
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std::vector<tag *> tags;
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Scheme scheme;
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std::vector<float> verts;
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std::vector<float> uvs;
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std::vector<float> normals;
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std::vector<int> nvertsPerFace;
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std::vector<int> faceverts;
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std::vector<int> faceuvs;
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std::vector<int> facenormals;
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std::vector<tag *> tags;
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Scheme scheme;
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char FindMaterial(char const * name) {
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for (int i=0; i<(int)mtls.size(); ++i) {
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if (mtls[i]->name==name) {
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return i;
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}
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}
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return -1;
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}
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std::string mtllib;
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std::vector<unsigned short> mtlbind;
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std::vector<material *> mtls;
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};
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//------------------------------------------------------------------------------
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