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fast_obj.h
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/*
* fast_obj
*
* Version 1.2
*
* MIT License
*
* Copyright (c) 2018-2021 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.
*
*/
#ifndef FAST_OBJ_HDR
#define FAST_OBJ_HDR
#define FAST_OBJ_VERSION_MAJOR 1
#define FAST_OBJ_VERSION_MINOR 2
#define FAST_OBJ_VERSION ((FAST_OBJ_VERSION_MAJOR << 8) | FAST_OBJ_VERSION_MINOR)
#include <stdlib.h>
typedef struct
{
/* Texture name from .mtl file */
char* name;
/* Resolved path to texture */
char* path;
} fastObjTexture;
typedef struct
{
/* Material name */
char* name;
/* Parameters */
float Ka[3]; /* Ambient */
float Kd[3]; /* Diffuse */
float Ks[3]; /* Specular */
float Ke[3]; /* Emission */
float Kt[3]; /* Transmittance */
float Ns; /* Shininess */
float Ni; /* Index of refraction */
float Tf[3]; /* Transmission filter */
float d; /* Disolve (alpha) */
int illum; /* Illumination model */
/* Texture maps */
fastObjTexture map_Ka;
fastObjTexture map_Kd;
fastObjTexture map_Ks;
fastObjTexture map_Ke;
fastObjTexture map_Kt;
fastObjTexture map_Ns;
fastObjTexture map_Ni;
fastObjTexture map_d;
fastObjTexture map_bump;
} fastObjMaterial;
/* Allows user override to bigger indexable array */
#ifndef FAST_OBJ_UINT_TYPE
#define FAST_OBJ_UINT_TYPE unsigned int
#endif
typedef FAST_OBJ_UINT_TYPE fastObjUInt;
typedef struct
{
fastObjUInt p;
fastObjUInt t;
fastObjUInt n;
} fastObjIndex;
typedef struct
{
/* Group name */
char* name;
/* Number of faces */
unsigned int face_count;
/* First face in fastObjMesh face_* arrays */
unsigned int face_offset;
/* First index in fastObjMesh indices array */
unsigned int index_offset;
} fastObjGroup;
typedef struct
{
/* Vertex data */
unsigned int position_count;
float* positions;
unsigned int texcoord_count;
float* texcoords;
unsigned int normal_count;
float* normals;
/* Face data: one element for each face */
unsigned int face_count;
unsigned int* face_vertices;
unsigned int* face_materials;
/* Index data: one element for each face vertex */
unsigned int index_count;
fastObjIndex* indices;
/* Materials */
unsigned int material_count;
fastObjMaterial* materials;
/* Mesh objects ('o' tag in .obj file) */
unsigned int object_count;
fastObjGroup* objects;
/* Mesh groups ('g' tag in .obj file) */
unsigned int group_count;
fastObjGroup* groups;
} fastObjMesh;
typedef struct
{
void* (*file_open)(const char* path, void* user_data);
void (*file_close)(void* file, void* user_data);
size_t (*file_read)(void* file, void* dst, size_t bytes, void* user_data);
unsigned long (*file_size)(void* file, void* user_data);
} fastObjCallbacks;
#ifdef __cplusplus
extern "C" {
#endif
fastObjMesh* fast_obj_read(const char* path);
fastObjMesh* fast_obj_read_with_callbacks(const char* path, const fastObjCallbacks* callbacks, void* user_data);
void fast_obj_destroy(fastObjMesh* mesh);
#ifdef __cplusplus
}
#endif
#endif
#ifdef FAST_OBJ_IMPLEMENTATION
#include <stdio.h>
#include <string.h>
#ifndef FAST_OBJ_REALLOC
#define FAST_OBJ_REALLOC realloc
#endif
#ifndef FAST_OBJ_FREE
#define FAST_OBJ_FREE free
#endif
#ifdef _WIN32
#define FAST_OBJ_SEPARATOR '\\'
#define FAST_OBJ_OTHER_SEP '/'
#else
#define FAST_OBJ_SEPARATOR '/'
#define FAST_OBJ_OTHER_SEP '\\'
#endif
/* Size of buffer to read into */
#define BUFFER_SIZE 65536
/* Max supported power when parsing float */
#define MAX_POWER 20
typedef struct
{
/* Final mesh */
fastObjMesh* mesh;
/* Current object/group */
fastObjGroup object;
fastObjGroup group;
/* Current material index */
unsigned int material;
/* Current line in file */
unsigned int line;
/* Base path for materials/textures */
char* base;
} fastObjData;
static const
double POWER_10_POS[MAX_POWER] =
{
1.0e0, 1.0e1, 1.0e2, 1.0e3, 1.0e4, 1.0e5, 1.0e6, 1.0e7, 1.0e8, 1.0e9,
1.0e10, 1.0e11, 1.0e12, 1.0e13, 1.0e14, 1.0e15, 1.0e16, 1.0e17, 1.0e18, 1.0e19,
};
static const
double POWER_10_NEG[MAX_POWER] =
{
1.0e0, 1.0e-1, 1.0e-2, 1.0e-3, 1.0e-4, 1.0e-5, 1.0e-6, 1.0e-7, 1.0e-8, 1.0e-9,
1.0e-10, 1.0e-11, 1.0e-12, 1.0e-13, 1.0e-14, 1.0e-15, 1.0e-16, 1.0e-17, 1.0e-18, 1.0e-19,
};
static void* memory_realloc(void* ptr, size_t bytes)
{
return FAST_OBJ_REALLOC(ptr, bytes);
}
static
void memory_dealloc(void* ptr)
{
FAST_OBJ_FREE(ptr);
}
#define array_clean(_arr) ((_arr) ? memory_dealloc(_array_header(_arr)), 0 : 0)
#define array_push(_arr, _val) (_array_mgrow(_arr, 1) ? ((_arr)[_array_size(_arr)++] = (_val), _array_size(_arr) - 1) : 0)
#define array_size(_arr) ((_arr) ? _array_size(_arr) : 0)
#define array_capacity(_arr) ((_arr) ? _array_capacity(_arr) : 0)
#define array_empty(_arr) (array_size(_arr) == 0)
#define _array_header(_arr) ((fastObjUInt*)(_arr)-2)
#define _array_size(_arr) (_array_header(_arr)[0])
#define _array_capacity(_arr) (_array_header(_arr)[1])
#define _array_ngrow(_arr, _n) ((_arr) == 0 || (_array_size(_arr) + (_n) >= _array_capacity(_arr)))
#define _array_mgrow(_arr, _n) (_array_ngrow(_arr, _n) ? (_array_grow(_arr, _n) != 0) : 1)
#define _array_grow(_arr, _n) (*((void**)&(_arr)) = array_realloc(_arr, _n, sizeof(*(_arr))))
static void* array_realloc(void* ptr, fastObjUInt n, fastObjUInt b)
{
fastObjUInt sz = array_size(ptr);
fastObjUInt nsz = sz + n;
fastObjUInt cap = array_capacity(ptr);
fastObjUInt ncap = 3 * cap / 2;
fastObjUInt* r;
if (ncap < nsz)
ncap = nsz;
ncap = (ncap + 15) & ~15u;
r = (fastObjUInt*)(memory_realloc(ptr ? _array_header(ptr) : 0, b * ncap + 2 * sizeof(fastObjUInt)));
if (!r)
return 0;
r[0] = sz;
r[1] = ncap;
return (r + 2);
}
static
void* file_open(const char* path, void* user_data)
{
(void)(user_data);
return fopen(path, "rb");
}
static
void file_close(void* file, void* user_data)
{
FILE* f;
(void)(user_data);
f = (FILE*)(file);
fclose(f);
}
static
size_t file_read(void* file, void* dst, size_t bytes, void* user_data)
{
FILE* f;
(void)(user_data);
f = (FILE*)(file);
return fread(dst, 1, bytes, f);
}
static
unsigned long file_size(void* file, void* user_data)
{
FILE* f;
long p;
long n;
(void)(user_data);
f = (FILE*)(file);
p = ftell(f);
fseek(f, 0, SEEK_END);
n = ftell(f);
fseek(f, p, SEEK_SET);
if (n > 0)
return (unsigned long)(n);
else
return 0;
}
static
char* string_copy(const char* s, const char* e)
{
size_t n;
char* p;
n = (size_t)(e - s);
p = (char*)(memory_realloc(0, n + 1));
if (p)
{
memcpy(p, s, n);
p[n] = '\0';
}
return p;
}
static
char* string_substr(const char* s, size_t a, size_t b)
{
return string_copy(s + a, s + b);
}
static
char* string_concat(const char* a, const char* s, const char* e)
{
size_t an;
size_t sn;
char* p;
an = a ? strlen(a) : 0;
sn = (size_t)(e - s);
p = (char*)(memory_realloc(0, an + sn + 1));
if (p)
{
if (a)
memcpy(p, a, an);
memcpy(p + an, s, sn);
p[an + sn] = '\0';
}
return p;
}
static
int string_equal(const char* a, const char* s, const char* e)
{
size_t an = strlen(a);
size_t sn = (size_t)(e - s);
return an == sn && memcmp(a, s, an) == 0;
}
static
void string_fix_separators(char* s)
{
while (*s)
{
if (*s == FAST_OBJ_OTHER_SEP)
*s = FAST_OBJ_SEPARATOR;
s++;
}
}
static
int is_whitespace(char c)
{
return (c == ' ' || c == '\t' || c == '\r');
}
static
int is_end_of_name(char c)
{
return (c == '\t' || c == '\r' || c == '\n');
}
static
int is_newline(char c)
{
return (c == '\n');
}
static
int is_digit(char c)
{
return (c >= '0' && c <= '9');
}
static
int is_exponent(char c)
{
return (c == 'e' || c == 'E');
}
static
const char* skip_whitespace(const char* ptr)
{
while (is_whitespace(*ptr))
ptr++;
return ptr;
}
static
const char* skip_line(const char* ptr)
{
while (!is_newline(*ptr++))
;
return ptr;
}
static
fastObjGroup object_default(void)
{
fastObjGroup object;
object.name = 0;
object.face_count = 0;
object.face_offset = 0;
object.index_offset = 0;
return object;
}
static
void object_clean(fastObjGroup* object)
{
memory_dealloc(object->name);
}
static
void flush_object(fastObjData* data)
{
/* Add object if not empty */
if (data->object.face_count > 0)
array_push(data->mesh->objects, data->object);
else
object_clean(&data->object);
/* Reset for more data */
data->object = object_default();
data->object.face_offset = array_size(data->mesh->face_vertices);
data->object.index_offset = array_size(data->mesh->indices);
}
static
fastObjGroup group_default(void)
{
fastObjGroup group;
group.name = 0;
group.face_count = 0;
group.face_offset = 0;
group.index_offset = 0;
return group;
}
static
void group_clean(fastObjGroup* group)
{
memory_dealloc(group->name);
}
static
void flush_group(fastObjData* data)
{
/* Add group if not empty */
if (data->group.face_count > 0)
array_push(data->mesh->groups, data->group);
else
group_clean(&data->group);
/* Reset for more data */
data->group = group_default();
data->group.face_offset = array_size(data->mesh->face_vertices);
data->group.index_offset = array_size(data->mesh->indices);
}
static
const char* parse_int(const char* ptr, int* val)
{
int sign;
int num;
if (*ptr == '-')
{
sign = -1;
ptr++;
}
else
{
sign = +1;
}
num = 0;
while (is_digit(*ptr))
num = 10 * num + (*ptr++ - '0');
*val = sign * num;
return ptr;
}
static
const char* parse_float(const char* ptr, float* val)
{
double sign;
double num;
double fra;
double div;
unsigned int eval;
const double* powers;
ptr = skip_whitespace(ptr);
switch (*ptr)
{
case '+':
sign = 1.0;
ptr++;
break;
case '-':
sign = -1.0;
ptr++;
break;
default:
sign = 1.0;
break;
}
num = 0.0;
while (is_digit(*ptr))
num = 10.0 * num + (double)(*ptr++ - '0');
if (*ptr == '.')
ptr++;
fra = 0.0;
div = 1.0;
while (is_digit(*ptr))
{
fra = 10.0 * fra + (double)(*ptr++ - '0');
div *= 10.0;
}
num += fra / div;
if (is_exponent(*ptr))
{
ptr++;
switch (*ptr)
{
case '+':
powers = POWER_10_POS;
ptr++;
break;
case '-':
powers = POWER_10_NEG;
ptr++;
break;
default:
powers = POWER_10_POS;
break;
}
eval = 0;
while (is_digit(*ptr))
eval = 10 * eval + (*ptr++ - '0');
num *= (eval >= MAX_POWER) ? 0.0 : powers[eval];
}
*val = (float)(sign * num);
return ptr;
}
static
const char* parse_vertex(fastObjData* data, const char* ptr)
{
unsigned int ii;
float v;
for (ii = 0; ii < 3; ii++)
{
ptr = parse_float(ptr, &v);
array_push(data->mesh->positions, v);
}
return ptr;
}
static
const char* parse_texcoord(fastObjData* data, const char* ptr)
{
unsigned int ii;
float v;
for (ii = 0; ii < 2; ii++)
{
ptr = parse_float(ptr, &v);
array_push(data->mesh->texcoords, v);
}
return ptr;
}
static
const char* parse_normal(fastObjData* data, const char* ptr)
{
unsigned int ii;
float v;
for (ii = 0; ii < 3; ii++)
{
ptr = parse_float(ptr, &v);
array_push(data->mesh->normals, v);
}
return ptr;
}
static
const char* parse_face(fastObjData* data, const char* ptr)
{
unsigned int count;
fastObjIndex vn;
int v;
int t;
int n;
ptr = skip_whitespace(ptr);
count = 0;
while (!is_newline(*ptr))
{
v = 0;
t = 0;
n = 0;
ptr = parse_int(ptr, &v);
if (*ptr == '/')
{
ptr++;
if (*ptr != '/')
ptr = parse_int(ptr, &t);
if (*ptr == '/')
{
ptr++;
ptr = parse_int(ptr, &n);
}
}
if (v < 0)
vn.p = (array_size(data->mesh->positions) / 3) - (fastObjUInt)(-v);
else
vn.p = (fastObjUInt)(v);
if (t < 0)
vn.t = (array_size(data->mesh->texcoords) / 2) - (fastObjUInt)(-t);
else if (t > 0)
vn.t = (fastObjUInt)(t);
else
vn.t = 0;
if (n < 0)
vn.n = (array_size(data->mesh->normals) / 3) - (fastObjUInt)(-n);
else if (n > 0)
vn.n = (fastObjUInt)(n);
else
vn.n = 0;
array_push(data->mesh->indices, vn);
count++;
ptr = skip_whitespace(ptr);
}
array_push(data->mesh->face_vertices, count);
array_push(data->mesh->face_materials, data->material);
data->group.face_count++;
data->object.face_count++;
return ptr;
}
static
const char* parse_object(fastObjData* data, const char* ptr)
{
const char* s;
const char* e;
ptr = skip_whitespace(ptr);
s = ptr;
while (!is_end_of_name(*ptr))
ptr++;
e = ptr;
flush_object(data);
data->object.name = string_copy(s, e);
return ptr;
}
static
const char* parse_group(fastObjData* data, const char* ptr)
{
const char* s;
const char* e;
ptr = skip_whitespace(ptr);
s = ptr;
while (!is_end_of_name(*ptr))
ptr++;
e = ptr;
flush_group(data);
data->group.name = string_copy(s, e);
return ptr;
}
static
fastObjTexture map_default(void)
{
fastObjTexture map;
map.name = 0;
map.path = 0;
return map;
}
static
fastObjMaterial mtl_default(void)
{
fastObjMaterial mtl;
mtl.name = 0;
mtl.Ka[0] = 0.0;
mtl.Ka[1] = 0.0;
mtl.Ka[2] = 0.0;
mtl.Kd[0] = 1.0;
mtl.Kd[1] = 1.0;
mtl.Kd[2] = 1.0;
mtl.Ks[0] = 0.0;
mtl.Ks[1] = 0.0;
mtl.Ks[2] = 0.0;
mtl.Ke[0] = 0.0;
mtl.Ke[1] = 0.0;
mtl.Ke[2] = 0.0;
mtl.Kt[0] = 0.0;
mtl.Kt[1] = 0.0;
mtl.Kt[2] = 0.0;
mtl.Ns = 1.0;
mtl.Ni = 1.0;
mtl.Tf[0] = 1.0;
mtl.Tf[1] = 1.0;
mtl.Tf[2] = 1.0;
mtl.d = 1.0;
mtl.illum = 1;
mtl.map_Ka = map_default();
mtl.map_Kd = map_default();
mtl.map_Ks = map_default();
mtl.map_Ke = map_default();
mtl.map_Kt = map_default();
mtl.map_Ns = map_default();
mtl.map_Ni = map_default();
mtl.map_d = map_default();
mtl.map_bump = map_default();
return mtl;
}
static
const char* parse_usemtl(fastObjData* data, const char* ptr)
{
const char* s;
const char* e;
unsigned int idx;
fastObjMaterial* mtl;
ptr = skip_whitespace(ptr);
/* Parse the material name */
s = ptr;
while (!is_end_of_name(*ptr))
ptr++;
e = ptr;
/* Find an existing material with the same name */
idx = 0;
while (idx < array_size(data->mesh->materials))
{
mtl = &data->mesh->materials[idx];
if (mtl->name && string_equal(mtl->name, s, e))
break;
idx++;
}
/* If doesn't exists, create a default one with this name
Note: this case happens when OBJ doesn't have its MTL */
if (idx == array_size(data->mesh->materials))
{
fastObjMaterial new_mtl = mtl_default();
new_mtl.name = string_copy(s, e);
array_push(data->mesh->materials, new_mtl);
}
data->material = idx;
return ptr;
}
static
void map_clean(fastObjTexture* map)
{
memory_dealloc(map->name);
memory_dealloc(map->path);
}
static
void mtl_clean(fastObjMaterial* mtl)
{
map_clean(&mtl->map_Ka);
map_clean(&mtl->map_Kd);
map_clean(&mtl->map_Ks);
map_clean(&mtl->map_Ke);
map_clean(&mtl->map_Kt);
map_clean(&mtl->map_Ns);
map_clean(&mtl->map_Ni);
map_clean(&mtl->map_d);
map_clean(&mtl->map_bump);
memory_dealloc(mtl->name);
}
static
const char* read_mtl_int(const char* p, int* v)
{
return parse_int(p, v);
}
static
const char* read_mtl_single(const char* p, float* v)
{
return parse_float(p, v);
}
static
const char* read_mtl_triple(const char* p, float v[3])
{
p = read_mtl_single(p, &v[0]);
p = read_mtl_single(p, &v[1]);
p = read_mtl_single(p, &v[2]);
return p;
}
static
const char* read_map(fastObjData* data, const char* ptr, fastObjTexture* map)
{
const char* s;
const char* e;
char* name;
char* path;
ptr = skip_whitespace(ptr);
/* Don't support options at present */
if (*ptr == '-')
return ptr;
/* Read name */
s = ptr;
while (!is_end_of_name(*ptr))
ptr++;
e = ptr;
name = string_copy(s, e);
path = string_concat(data->base, s, e);
string_fix_separators(path);
map->name = name;
map->path = path;
return e;
}
static
int read_mtllib(fastObjData* data, void* file, const fastObjCallbacks* callbacks, void* user_data)
{
unsigned long n;
const char* s;
char* contents;
size_t l;
const char* p;