panikon / tinyobjloader-c

Header only tiny wavefront .obj loader in pure C99

tinyobjloader in C

Tiny but powerful header only wavefront obj loader written in C99(Can also be compilable with C89 compiler).

If you are looking for C++ version, please see https://github.com/syoyo/tinyobjloader

Current status

Experimental. Loading geometry data would be OK, More testing required for materials and shapes.

Features

• Single file, header only
• Dependency-free pure C99/C89 implementation(except for libc)
• Provides mostly similar functionality as in C++ version. https://github.com/syoyo/tinyobjloader
• Moderate speed and moderate memory consumption
  • Rungholt 7M triangle scene(260 MB) can be loaded in 4.7 secs and consumes 3.6 GB memory at the maximum on MacBook12 Core m5 1.2 GHz(single core use)
• Unit tests using acutest thanks to @andystanton

Usage

Copy tinyobj_loader_c.h to your project.

/* define TINYOBJ_LOADER_C_IMPLEMENTATION for only *one* .c */
#define TINYOBJ_LOADER_C_IMPLEMENTATION
#include "tinyobj_loader_c.h"

...

See examples/viewer/ for more details.

tinyobjloader allocates memory. To replace the functions used for allocation, define TINYOBJ_MALLOC, TINYOBJ_REALLOC, TINYOBJ_CALLOC and TINYOBJ_FREE in the .c file you defined TINYOBJ_LOADER_C_IMPLEMENTATION in, before including tinyobj_loader_c.h. Define either all or none of them. They replace malloc, realloc, calloc and free respectively.

Example:

#define TINYOBJ_LOADER_C_IMPLEMENTATION
#define TINYOBJ_MALLOC my_malloc
#define TINYOBJ_REALLOC my_realloc
#define TINYOBJ_CALLOC my_calloc
#define TINYOBJ_FREE my_free
#include "tinyobj_loader_c.h"

Tests

The single header test library acutest is used to provide a test runner and assertion macros. There are two test suites: one for the API and one for the internal functions. Ultimately the internal tests should be removed, but are useful while the project is volatile.

The tests can be run from the project root using:

$ make test

This builds and executes a binary called tinyobj_tests in the test folder. There are some options to run specific tests that can be passed to the executable directly that are described on the acutest readme.

By default acutest forks for each test. To disable this for debugging purposes, you can pass the switch --no-exec to tinyobj_tests.

License

MIT license.

Third party licenses

• acutest Another C/C++ Unit Test facility. MIT license. http://github.com/mity/acutest

TODO

• Windows build?