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axmol/core/3d/ObjLoader.cpp

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/****************************************************************************
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
https://axmol.dev/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <cmath>
#include <cstddef>
#include <string>
#include <vector>
#include <map>
#include <fstream>
#include <sstream>
#include "platform/FileUtils.h"
#include "base/Utils.h"
#include "3d/ObjLoader.h"
namespace tinyobj
{
struct vertex_index
{
int v_idx, vt_idx, vn_idx;
vertex_index() : v_idx(0), vt_idx(0), vn_idx(0){};
vertex_index(int idx) : v_idx(idx), vt_idx(idx), vn_idx(idx){};
vertex_index(int vidx, int vtidx, int vnidx) : v_idx(vidx), vt_idx(vtidx), vn_idx(vnidx){};
};
// for std::map
static inline bool operator<(const vertex_index& a, const vertex_index& b)
{
if (a.v_idx != b.v_idx)
return (a.v_idx < b.v_idx);
if (a.vn_idx != b.vn_idx)
return (a.vn_idx < b.vn_idx);
if (a.vt_idx != b.vt_idx)
return (a.vt_idx < b.vt_idx);
return false;
}
struct obj_shape
{
std::vector<float> v;
std::vector<float> vn;
std::vector<float> vt;
};
static inline bool isSpace(const char c)
{
return (c == ' ') || (c == '\t');
}
static inline bool isNewLine(const char c)
{
return (c == '\r') || (c == '\n') || (c == '\0');
}
// Make index zero-base, and also support relative index.
static inline int fixIndex(int idx, int n)
{
if (idx > 0)
return idx - 1;
if (idx == 0)
return 0;
return n + idx; // negative value = relative
}
static inline std::string parseString(const char*& token)
{
std::string s;
token += strspn(token, " \t");
size_t e = strcspn(token, " \t\r");
s = std::string(token, &token[e]);
token += e;
return s;
}
static inline int parseInt(const char*& token)
{
token += strspn(token, " \t");
int i = atoi(token);
token += strcspn(token, " \t\r");
return i;
}
// Tries to parse a floating point number located at s.
//
// s_end should be a location in the string where reading should absolutely
// stop. For example at the end of the string, to prevent buffer overflows.
//
// Parses the following EBNF grammar:
// sign = "+" | "-" ;
// END = ? anything not in digit ?
// digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
// integer = [sign] , digit , {digit} ;
// decimal = integer , ["." , integer] ;
// float = ( decimal , END ) | ( decimal , ("E" | "e") , integer , END ) ;
//
// Valid strings are for example:
// -0 +3.1417e+2 -0.0E-3 1.0324 -1.41 11e2
//
// If the parsing is a success, result is set to the parsed value and true
// is returned.
//
// The function is greedy and will parse until any of the following happens:
// - a non-conforming character is encountered.
// - s_end is reached.
//
// The following situations triggers a failure:
// - s >= s_end.
// - parse failure.
//
static bool tryParseDouble(const char* s, const char* s_end, double* result)
{
if (s >= s_end)
{
return false;
}
double mantissa = 0.0;
// This exponent is base 2 rather than 10.
// However the exponent we parse is supposed to be one of ten,
// thus we must take care to convert the exponent/and or the
// mantissa to a * 2^E, where a is the mantissa and E is the
// exponent.
// To get the final double we will use ldexp, it requires the
// exponent to be in base 2.
int exponent = 0;
// NOTE: THESE MUST BE DECLARED HERE SINCE WE ARE NOT ALLOWED
// TO JUMP OVER DEFINITIONS.
char sign = '+';
char exp_sign = '+';
char const* curr = s;
// How many characters were read in a loop.
int read = 0;
// Tells whether a loop terminated due to reaching s_end.
bool end_not_reached = false;
/*
BEGIN PARSING.
*/
// Find out what sign we've got.
if (*curr == '+' || *curr == '-')
{
sign = *curr;
curr++;
}
else if (isdigit(*curr))
{ /* Pass through. */
}
else
{
goto fail;
}
// Read the integer part.
while ((end_not_reached = (curr != s_end)) && isdigit(*curr))
{
mantissa *= 10;
mantissa += static_cast<int>(*curr - 0x30);
curr++;
read++;
}
// We must make sure we actually got something.
if (read == 0)
goto fail;
// We allow numbers of form "#", "###" etc.
if (!end_not_reached)
goto assemble;
// Read the decimal part.
if (*curr == '.')
{
curr++;
read = 1;
while ((end_not_reached = (curr != s_end)) && isdigit(*curr))
{
// NOTE: Don't use powf here, it will absolutely murder precision.
mantissa += static_cast<int>(*curr - 0x30) * pow(10.0, -read);
read++;
curr++;
}
}
else if (*curr == 'e' || *curr == 'E')
{
}
else
{
goto assemble;
}
if (!end_not_reached)
goto assemble;
// Read the exponent part.
if (*curr == 'e' || *curr == 'E')
{
curr++;
// Figure out if a sign is present and if it is.
if ((end_not_reached = (curr != s_end)) && (*curr == '+' || *curr == '-'))
{
exp_sign = *curr;
curr++;
}
else if (isdigit(*curr))
{ /* Pass through. */
}
else
{
// Empty E is not allowed.
goto fail;
}
read = 0;
while ((end_not_reached = (curr != s_end)) && isdigit(*curr))
{
exponent *= 10;
exponent += static_cast<int>(*curr - 0x30);
curr++;
read++;
}
exponent *= (exp_sign == '+' ? 1 : -1);
if (read == 0)
goto fail;
}
assemble:
*result = (sign == '+' ? 1 : -1) * ldexp(mantissa * pow(5.0, exponent), exponent);
return true;
fail:
return false;
}
static inline float parseFloat(const char*& token)
{
token += strspn(token, " \t");
#ifdef TINY_OBJ_LOADER_OLD_FLOAT_PARSER
float f = (float)utils::atof(token);
token += strcspn(token, " \t\r");
#else
const char* end = token + strcspn(token, " \t\r");
double val = 0.0;
tryParseDouble(token, end, &val);
float f = static_cast<float>(val);
token = end;
#endif
return f;
}
static inline void parseFloat2(float& x, float& y, const char*& token)
{
x = parseFloat(token);
y = parseFloat(token);
}
static inline void parseFloat3(float& x, float& y, float& z, const char*& token)
{
x = parseFloat(token);
y = parseFloat(token);
z = parseFloat(token);
}
// Parse triples: i, i/j/k, i//k, i/j
static vertex_index parseTriple(const char*& token, int vsize, int vnsize, int vtsize)
{
vertex_index vi(-1);
vi.v_idx = fixIndex(atoi(token), vsize);
token += strcspn(token, "/ \t\r");
if (token[0] != '/')
{
return vi;
}
token++;
// i//k
if (token[0] == '/')
{
token++;
vi.vn_idx = fixIndex(atoi(token), vnsize);
token += strcspn(token, "/ \t\r");
return vi;
}
// i/j/k or i/j
vi.vt_idx = fixIndex(atoi(token), vtsize);
token += strcspn(token, "/ \t\r");
if (token[0] != '/')
{
return vi;
}
// i/j/k
token++; // skip '/'
vi.vn_idx = fixIndex(atoi(token), vnsize);
token += strcspn(token, "/ \t\r");
return vi;
}
static std::string_view nextWord(const char* token) {
const char* endptr = strpbrk(token, " \t");
return endptr ? std::string_view{token, static_cast<size_t>(endptr - token)} : token;
}
static unsigned int updateVertex(std::map<vertex_index, unsigned int>& vertexCache,
std::vector<float>& positions,
std::vector<float>& normals,
std::vector<float>& texcoords,
const std::vector<float>& in_positions,
const std::vector<float>& in_normals,
const std::vector<float>& in_texcoords,
const vertex_index& i)
{
const std::map<vertex_index, unsigned int>::iterator it = vertexCache.find(i);
if (it != vertexCache.end())
{
// found cache
return it->second;
}
assert(in_positions.size() > (unsigned int)(3 * i.v_idx + 2));
positions.emplace_back(in_positions[3 * i.v_idx + 0]);
positions.emplace_back(in_positions[3 * i.v_idx + 1]);
positions.emplace_back(in_positions[3 * i.v_idx + 2]);
if (i.vn_idx >= 0)
{
normals.emplace_back(in_normals[3 * i.vn_idx + 0]);
normals.emplace_back(in_normals[3 * i.vn_idx + 1]);
normals.emplace_back(in_normals[3 * i.vn_idx + 2]);
}
if (i.vt_idx >= 0)
{
texcoords.emplace_back(in_texcoords[2 * i.vt_idx + 0]);
texcoords.emplace_back(in_texcoords[2 * i.vt_idx + 1]);
}
unsigned int idx = static_cast<unsigned int>(positions.size() / 3 - 1);
vertexCache[i] = idx;
return idx;
}
void InitMaterial(material_t& material)
{
material.name = "";
material.ambient_texname = "";
material.diffuse_texname = "";
material.specular_texname = "";
material.normal_texname = "";
for (int i = 0; i < 3; i++)
{
material.ambient[i] = 0.f;
material.diffuse[i] = 0.f;
material.specular[i] = 0.f;
material.transmittance[i] = 0.f;
material.emission[i] = 0.f;
}
material.illum = 0;
material.dissolve = 1.f;
material.shininess = 1.f;
material.ior = 1.f;
material.unknown_parameter.clear();
}
static bool exportFaceGroupToShape(shape_t& shape,
std::map<vertex_index, unsigned int> vertexCache,
const std::vector<float>& in_positions,
const std::vector<float>& in_normals,
const std::vector<float>& in_texcoords,
const std::vector<std::vector<vertex_index>>& faceGroup,
const int material_id,
std::string_view name,
bool clearCache)
{
if (faceGroup.empty())
{
return false;
}
// Flatten vertices and indices
for (size_t i = 0, size = faceGroup.size(); i < size; ++i)
{
const std::vector<vertex_index>& face = faceGroup[i];
vertex_index i0 = face[0];
vertex_index i1(-1);
vertex_index i2 = face[1];
size_t npolys = face.size();
// Polygon -> triangle fan conversion
for (size_t k = 2; k < npolys; k++)
{
i1 = i2;
i2 = face[k];
unsigned int v0 = updateVertex(vertexCache, shape.mesh.positions, shape.mesh.normals, shape.mesh.texcoords,
in_positions, in_normals, in_texcoords, i0);
unsigned int v1 = updateVertex(vertexCache, shape.mesh.positions, shape.mesh.normals, shape.mesh.texcoords,
in_positions, in_normals, in_texcoords, i1);
unsigned int v2 = updateVertex(vertexCache, shape.mesh.positions, shape.mesh.normals, shape.mesh.texcoords,
in_positions, in_normals, in_texcoords, i2);
shape.mesh.indices.emplace_back(v0);
shape.mesh.indices.emplace_back(v1);
shape.mesh.indices.emplace_back(v2);
shape.mesh.material_ids.emplace_back(material_id);
}
}
shape.name = name;
if (clearCache)
vertexCache.clear();
return true;
}
static std::string& replacePathSeperator(std::string& path)
{
for (std::string::size_type i = 0, size = path.size(); i < size; ++i)
{
if (path[i] == '\\')
path[i] = '/';
}
return path;
}
std::string LoadMtl(hlookup::string_map<int>& material_map,
std::vector<material_t>& materials,
std::istream& inStream)
{
std::stringstream err;
// Create a default material anyway.
material_t material;
InitMaterial(material);
int maxchars = 8192; // Alloc enough size.
std::vector<char> buf(maxchars); // Alloc enough size.
while (inStream.peek() != -1)
{
inStream.getline(&buf[0], maxchars);
std::string linebuf(&buf[0]);
// Trim newline '\r\n' or '\n'
if (!linebuf.empty())
{
if (linebuf[linebuf.size() - 1] == '\n')
linebuf.erase(linebuf.size() - 1);
}
if (!linebuf.empty())
{
if (linebuf[linebuf.size() - 1] == '\r')
linebuf.erase(linebuf.size() - 1);
}
// Skip if empty line.
if (linebuf.empty())
{
continue;
}
// Skip leading space.
const char* token = linebuf.c_str();
token += strspn(token, " \t");
assert(token);
if (token[0] == '\0')
continue; // empty line
if (token[0] == '#')
continue; // comment line
// new mtl
if ((0 == strncmp(token, "newmtl", 6)) && isSpace((token[6])))
{
// flush previous material.
if (!material.name.empty())
{
material_map.emplace(material.name, static_cast<int>(materials.size()));
materials.emplace_back(material);
}
// initial temporary material
InitMaterial(material);
// set new mtl name
token += 7;
material.name = nextWord(token);
continue;
}
// ambient
if (token[0] == 'K' && token[1] == 'a' && isSpace((token[2])))
{
token += 2;
float r, g, b;
parseFloat3(r, g, b, token);
material.ambient[0] = r;
material.ambient[1] = g;
material.ambient[2] = b;
continue;
}
// diffuse
if (token[0] == 'K' && token[1] == 'd' && isSpace((token[2])))
{
token += 2;
float r, g, b;
parseFloat3(r, g, b, token);
material.diffuse[0] = r;
material.diffuse[1] = g;
material.diffuse[2] = b;
continue;
}
// specular
if (token[0] == 'K' && token[1] == 's' && isSpace((token[2])))
{
token += 2;
float r, g, b;
parseFloat3(r, g, b, token);
material.specular[0] = r;
material.specular[1] = g;
material.specular[2] = b;
continue;
}
// transmittance
if (token[0] == 'K' && token[1] == 't' && isSpace((token[2])))
{
token += 2;
float r, g, b;
parseFloat3(r, g, b, token);
material.transmittance[0] = r;
material.transmittance[1] = g;
material.transmittance[2] = b;
continue;
}
// ior(index of refraction)
if (token[0] == 'N' && token[1] == 'i' && isSpace((token[2])))
{
token += 2;
material.ior = parseFloat(token);
continue;
}
// emission
if (token[0] == 'K' && token[1] == 'e' && isSpace(token[2]))
{
token += 2;
float r, g, b;
parseFloat3(r, g, b, token);
material.emission[0] = r;
material.emission[1] = g;
material.emission[2] = b;
continue;
}
// shininess
if (token[0] == 'N' && token[1] == 's' && isSpace(token[2]))
{
token += 2;
material.shininess = parseFloat(token);
continue;
}
// illum model
if (0 == strncmp(token, "illum", 5) && isSpace(token[5]))
{
token += 6;
material.illum = parseInt(token);
continue;
}
// dissolve
if ((token[0] == 'd' && isSpace(token[1])))
{
token += 1;
material.dissolve = parseFloat(token);
continue;
}
if (token[0] == 'T' && token[1] == 'r' && isSpace(token[2]))
{
token += 2;
// Invert value of Tr(assume Tr is in range [0, 1])
material.dissolve = 1.0f - parseFloat(token);
continue;
}
// ambient texture
if ((0 == strncmp(token, "map_Ka", 6)) && isSpace(token[6]))
{
token += 7;
material.ambient_texname = token;
replacePathSeperator(material.ambient_texname);
continue;
}
// diffuse texture
if ((0 == strncmp(token, "map_Kd", 6)) && isSpace(token[6]))
{
token += 7;
material.diffuse_texname = token;
replacePathSeperator(material.diffuse_texname);
continue;
}
// specular texture
if ((0 == strncmp(token, "map_Ks", 6)) && isSpace(token[6]))
{
token += 7;
material.specular_texname = token;
replacePathSeperator(material.specular_texname);
continue;
}
// normal texture
if ((0 == strncmp(token, "map_Ns", 6)) && isSpace(token[6]))
{
token += 7;
material.normal_texname = token;
replacePathSeperator(material.normal_texname);
continue;
}
// unknown parameter
const char* _space = strchr(token, ' ');
if (!_space)
{
_space = strchr(token, '\t');
}
if (_space)
{
std::ptrdiff_t len = _space - token;
std::string key(token, len);
std::string value = _space + 1;
material.unknown_parameter.emplace(std::move(key), std::move(value));
}
}
// flush last material.
material_map.insert(std::pair<std::string, int>(material.name, static_cast<int>(materials.size())));
materials.emplace_back(material);
return err.str();
}
std::string MaterialFileReader::operator()(std::string_view matId,
std::vector<material_t>& materials,
hlookup::string_map<int>& matMap)
{
std::string filepath;
if (!m_mtlBasePath.empty())
{
filepath.append(m_mtlBasePath).append(matId);
}
else
{
filepath = matId;
}
std::string err = "";
std::istringstream matIStream(ax::FileUtils::getInstance()->getStringFromFile(filepath));
if (!matIStream)
{
std::stringstream ss;
ss << "WARN: Material file [ " << filepath << " ] not found. Created a default material.";
err += ss.str();
}
err += LoadMtl(matMap, materials, matIStream);
return err;
}
std::string LoadObj(std::vector<shape_t>& shapes,
std::vector<material_t>& materials, // [output]
const char* filename,
const char* mtl_basepath)
{
shapes.clear();
std::stringstream err;
std::istringstream ifs(ax::FileUtils::getInstance()->getStringFromFile(filename));
if (!ifs)
{
err << "Cannot open file [" << filename << "]" << std::endl;
return err.str();
}
std::string basePath;
if (mtl_basepath)
{
basePath = mtl_basepath;
}
MaterialFileReader matFileReader(basePath);
return LoadObj(shapes, materials, ifs, matFileReader);
}
std::string LoadObj(std::vector<shape_t>& shapes,
std::vector<material_t>& materials, // [output]
std::istream& inStream,
MaterialReader& readMatFn)
{
std::stringstream err;
std::vector<float> v;
std::vector<float> vn;
std::vector<float> vt;
std::vector<std::vector<vertex_index>> faceGroup;
std::string name;
// material
hlookup::string_map<int> material_map;
std::map<vertex_index, unsigned int> vertexCache;
int material = -1;
shape_t shape;
int maxchars = 8192; // Alloc enough size.
std::vector<char> buf(maxchars); // Alloc enough size.
while (inStream.peek() != -1)
{
inStream.getline(&buf[0], maxchars);
std::string linebuf(&buf[0]);
// Trim newline '\r\n' or '\n'
if (!linebuf.empty())
{
if (linebuf[linebuf.size() - 1] == '\n')
linebuf.erase(linebuf.size() - 1);
}
if (!linebuf.empty())
{
if (linebuf[linebuf.size() - 1] == '\r')
linebuf.erase(linebuf.size() - 1);
}
// Skip if empty line.
if (linebuf.empty())
{
continue;
}
// Skip leading space.
const char* token = linebuf.c_str();
token += strspn(token, " \t");
assert(token);
if (token[0] == '\0')
continue; // empty line
if (token[0] == '#')
continue; // comment line
// vertex
if (token[0] == 'v' && isSpace((token[1])))
{
token += 2;
float x, y, z;
parseFloat3(x, y, z, token);
v.emplace_back(x);
v.emplace_back(y);
v.emplace_back(z);
continue;
}
// normal
if (token[0] == 'v' && token[1] == 'n' && isSpace((token[2])))
{
token += 3;
float x, y, z;
parseFloat3(x, y, z, token);
vn.emplace_back(x);
vn.emplace_back(y);
vn.emplace_back(z);
continue;
}
// texcoord
if (token[0] == 'v' && token[1] == 't' && isSpace((token[2])))
{
token += 3;
float x, y;
parseFloat2(x, y, token);
vt.emplace_back(x);
vt.emplace_back(y);
continue;
}
// face
if (token[0] == 'f' && isSpace((token[1])))
{
token += 2;
token += strspn(token, " \t");
std::vector<vertex_index> face;
auto first = static_cast<int>(v.size() / 3);
auto second = static_cast<int>(vn.size() / 3);
auto third = static_cast<int>(vt.size() / 2);
while (!isNewLine(token[0]))
{
vertex_index vi = parseTriple(token, first, second, third);
face.emplace_back(vi);
size_t n = strspn(token, " \t\r");
token += n;
}
faceGroup.emplace_back(face);
continue;
}
// use mtl
if ((0 == strncmp(token, "usemtl", 6)) && isSpace((token[6])))
{
token += 7;
auto tmpName = nextWord(token);
// Create face group per material.
bool ret = exportFaceGroupToShape(shape, vertexCache, v, vn, vt, faceGroup, material, name, true);
if (ret)
{
shapes.emplace_back(shape);
}
shape = shape_t();
faceGroup.clear();
auto iter = material_map.find(tmpName);
if (iter != material_map.end())
{
material = iter->second;
}
else
{
// { error!! material not found }
material = -1;
}
continue;
}
// load mtl
if ((0 == strncmp(token, "mtllib", 6)) && isSpace((token[6])))
{
token += 7;
std::string err_mtl = readMatFn(nextWord(token), materials, material_map);
if (!err_mtl.empty())
{
faceGroup.clear(); // for safety
return err_mtl;
}
continue;
}
// group name
if (token[0] == 'g' && isSpace((token[1])))
{
// flush previous face group.
bool ret = exportFaceGroupToShape(shape, vertexCache, v, vn, vt, faceGroup, material, name, true);
if (ret)
{
shapes.emplace_back(shape);
}
shape = shape_t();
// material = -1;
faceGroup.clear();
std::vector<std::string> names;
while (!isNewLine(token[0]))
{
std::string str = parseString(token);
names.emplace_back(str);
token += strspn(token, " \t\r"); // skip tag
}
assert(!names.empty());
// names[0] must be 'g', so skip the 0th element.
if (names.size() > 1)
{
name = names[1];
}
else
{
name = "";
}
continue;
}
// object name
if (token[0] == 'o' && isSpace((token[1])))
{
// flush previous face group.
bool ret = exportFaceGroupToShape(shape, vertexCache, v, vn, vt, faceGroup, material, name, true);
if (ret)
{
shapes.emplace_back(shape);
}
// material = -1;
faceGroup.clear();
shape = shape_t();
// @todo { multiple object name? }
token += 2;
name = nextWord(token);
continue;
}
// Ignore unknown command.
}
bool ret = exportFaceGroupToShape(shape, vertexCache, v, vn, vt, faceGroup, material, name, true);
if (ret)
{
shapes.emplace_back(shape);
}
faceGroup.clear(); // for safety
return err.str();
}
} // namespace tinyobj
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