organicmaps/fast_obj
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Richard Knight 2018-07-29 13:41:09 +01:00
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README.md
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# fast_obj
# fast_obj
Because the world needs another OBJ loader. Much faster (5-10x) than other libraries, but much
less tested. If you want a stable well tested library, I'd probably go elsewhere for now.
Single header library, should compile without warnings in both C89 or C++.
Code pulled out of a larger project and massaged until it compiled, so if it looks a bit wierd in
places, that's why!
To use:
fastObjMesh* mesh = fast_obj_read("path/to/objfile.obj");
...do stuff with mesh...
fast_obj_destroy(mesh);
Simple test app to compare speed against [tinyobjloader](https://github.com/syoyo/tinyobjloader) and
check output matches.

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fast_obj.c Normal file
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/*
*
* MIT License
*
* Copyright (c) 2018 Richard Knight
*
* 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.
*
*/
#define FAST_OBJ_IMPLEMENTATION
#include "fast_obj.h"

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fast_obj.h Normal file
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test.cpp Normal file
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/*
*
* MIT License
*
* Copyright (c) 2018 Richard Knight
*
* 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.
*
*/
#define FAST_OBJ_IMPLEMENTATION
#include "fast_obj.h"
#define TINYOBJLOADER_IMPLEMENTATION
#include "tiny_obj_loader.h"
using namespace tinyobj;
struct tinyObj
{
attrib_t attrib;
std::vector<shape_t> shapes;
std::vector<material_t> materials;
};
static
void read_tiny_obj(const char* path, tinyObj* o)
{
std::string err;
LoadObj(&o->attrib, &o->shapes, &o->materials, &err, path, 0, false);
}
static
void check(bool c, const char* m)
{
if (!c)
printf("CHECK FAILED : %s\n", m);
}
#define CHECK(_c) check(_c, #_c)
static
void compare_mesh(fastObjMesh* m, tinyObj* o)
{
CHECK(m->group_count == o->shapes.size());
for (int ii = 0; ii < m->group_count; ii++)
{
const fastObjGroup& grp = m->groups[ii];
const shape_t& shp = o->shapes[ii];
CHECK(shp.name == grp.name);
CHECK(shp.mesh.num_face_vertices.size() == grp.face_count);
int idx = 0;
for (int jj = 0; jj < grp.face_count; jj++)
{
CHECK(shp.mesh.num_face_vertices[jj] == grp.vertices[jj]);
for (int kk = 0; kk < grp.vertices[jj]; kk++)
{
index_t oi = shp.mesh.indices[idx];
fastObjIndex mi = grp.indices[idx];
CHECK(oi.vertex_index + 1 == mi.p);
CHECK(oi.texcoord_index + 1 == mi.t);
CHECK(oi.normal_index + 1 == mi.n);
if (mi.p)
{
CHECK(o->attrib.vertices[3 * oi.vertex_index + 0] == m->positions[3 * mi.p + 0]);
CHECK(o->attrib.vertices[3 * oi.vertex_index + 1] == m->positions[3 * mi.p + 1]);
CHECK(o->attrib.vertices[3 * oi.vertex_index + 2] == m->positions[3 * mi.p + 2]);
}
if (mi.t)
{
CHECK(o->attrib.texcoords[2 * oi.texcoord_index + 0] == m->texcoords[2 * mi.t + 0]);
CHECK(o->attrib.texcoords[2 * oi.texcoord_index + 1] == m->texcoords[2 * mi.t + 1]);
}
if (mi.n)
{
CHECK(o->attrib.normals[3 * oi.normal_index + 0] == m->normals[3 * mi.n + 0]);
CHECK(o->attrib.normals[3 * oi.normal_index + 1] == m->normals[3 * mi.n + 1]);
CHECK(o->attrib.normals[3 * oi.normal_index + 2] == m->normals[3 * mi.n + 2]);
}
idx++;
}
}
}
}
int main(int argc, const char* argv[])
{
if (argc != 2)
{
printf("%s <obj file>\n", argv[0]);
return -1;
}
printf("Reading with fast_obj\n");
fastObjMesh* m = fast_obj_read(argv[1]);
printf("Reading with tiny_obj_loader\n");
tinyObj o;
read_tiny_obj(argv[1], &o);
printf("Comparing...\n");
compare_mesh(m, &o);
printf("Done\n");
fast_obj_destroy(m);
return 0;
}