organicmaps/fast_obj
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Merge pull request #23 from BeastLe9enD/master

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Virtual filesystem support
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Richard Knight 2021-03-06 08:49:26 +00:00 • committed by GitHub
commit e7a99e63a0
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 51 additions and 21 deletions
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72
fast_obj.h
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@ -34,6 +34,8 @@
#define FAST_OBJ_VERSION_MINOR 0
#define FAST_OBJ_VERSION ((FAST_OBJ_VERSION_MAJOR << 8) | FAST_OBJ_VERSION_MINOR)
#include <stdlib.h>
typedef struct
{
@ -139,11 +141,20 @@ typedef struct
} 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
@ -156,7 +167,6 @@ void fast_obj_destroy(fastObjMesh* mesh);
#ifdef FAST_OBJ_IMPLEMENTATION
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef FAST_OBJ_REALLOC
@ -269,16 +279,18 @@ static void* array_realloc(void* ptr, fastObjUInt n, fastObjUInt b)
static
void* file_open(const char* path)
void* file_open(const char* path, void* user_data)
{
(void)(user_data);
return fopen(path, "rb");
}
static
void file_close(void* file)
void file_close(void* file, void* user_data)
{
FILE* f;
FILE* f;
(void)(user_data);
f = (FILE*)(file);
fclose(f);
@ -286,9 +298,10 @@ void file_close(void* file)
static
size_t file_read(void* file, void* dst, size_t bytes)
size_t file_read(void* file, void* dst, size_t bytes, void* user_data)
{
FILE* f;
FILE* f;
(void)(user_data);
f = (FILE*)(file);
return fread(dst, 1, bytes, f);
@ -296,12 +309,13 @@ size_t file_read(void* file, void* dst, size_t bytes)
static
unsigned long file_size(void* file)
unsigned long file_size(void* file, void* user_data)
{
FILE* f;
long p;
long n;
(void)(user_data);
f = (FILE*)(file);
p = ftell(f);
@ -910,7 +924,7 @@ const char* read_map(fastObjData* data, const char* ptr, fastObjTexture* map)
static
int read_mtllib(fastObjData* data, void* file)
int read_mtllib(fastObjData* data, void* file, const fastObjCallbacks* callbacks, void* user_data)
{
unsigned long n;
const char* s;
@ -923,13 +937,13 @@ int read_mtllib(fastObjData* data, void* file)
/* Read entire file */
n = file_size(file);
n = callbacks->file_size(file, user_data);
contents = (char*)(memory_realloc(0, n + 1));
if (!contents)
return 0;
l = file_read(file, contents, n);
l = callbacks->file_read(file, contents, n, user_data);
contents[l] = '\n';
mtl = mtl_default();
@ -1100,7 +1114,7 @@ int read_mtllib(fastObjData* data, void* file)
static
const char* parse_mtllib(fastObjData* data, const char* ptr)
const char* parse_mtllib(fastObjData* data, const char* ptr, const fastObjCallbacks* callbacks, void* user_data)
{
const char* s;
const char* e;
@ -1121,11 +1135,11 @@ const char* parse_mtllib(fastObjData* data, const char* ptr)
{
string_fix_separators(lib);
file = file_open(lib);
file = callbacks->file_open(lib, user_data);
if (file)
{
read_mtllib(data, file);
file_close(file);
read_mtllib(data, file, callbacks, user_data);
callbacks->file_close(file, user_data);
}
memory_dealloc(lib);
@ -1136,7 +1150,7 @@ const char* parse_mtllib(fastObjData* data, const char* ptr)
static
void parse_buffer(fastObjData* data, const char* ptr, const char* end)
void parse_buffer(fastObjData* data, const char* ptr, const char* end, const fastObjCallbacks* callbacks, void* user_data)
{
const char* p;
@ -1209,7 +1223,7 @@ void parse_buffer(fastObjData* data, const char* ptr, const char* end)
p[3] == 'i' &&
p[4] == 'b' &&
is_whitespace(p[5]))
p = parse_mtllib(data, p + 5);
p = parse_mtllib(data, p + 5, callbacks, user_data);
break;
case 'u':
@ -1259,6 +1273,18 @@ void fast_obj_destroy(fastObjMesh* m)
fastObjMesh* fast_obj_read(const char* path)
{
fastObjCallbacks callbacks;
callbacks.file_open = file_open;
callbacks.file_close = file_close;
callbacks.file_read = file_read;
callbacks.file_size = file_size;
return fast_obj_read_with_callbacks(path, &callbacks, 0);
}
fastObjMesh* fast_obj_read_with_callbacks(const char* path, const fastObjCallbacks* callbacks, void* user_data)
{
fastObjData data;
fastObjMesh* m;
@ -1270,9 +1296,13 @@ fastObjMesh* fast_obj_read(const char* path)
fastObjUInt read;
fastObjUInt bytes;
/* Check if callbacks are valid */
if(!callbacks)
return 0;
/* Open file */
file = file_open(path);
file = callbacks->file_open(path, user_data);
if (!file)
return 0;
@ -1335,7 +1365,7 @@ fastObjMesh* fast_obj_read(const char* path)
for (;;)
{
/* Read another buffer's worth from file */
read = (fastObjUInt)(file_read(file, start, BUFFER_SIZE));
read = (fastObjUInt)(callbacks->file_read(file, start, BUFFER_SIZE, user_data));
if (read == 0 && start == buffer)
break;
@ -1370,7 +1400,7 @@ fastObjMesh* fast_obj_read(const char* path)
/* Process buffer */
parse_buffer(&data, buffer, last);
parse_buffer(&data, buffer, last, callbacks, user_data);
/* Copy overflow for next buffer */
@ -1396,7 +1426,7 @@ fastObjMesh* fast_obj_read(const char* path)
memory_dealloc(buffer);
memory_dealloc(data.base);
file_close(file);
callbacks->file_close(file, user_data);
return m;
}