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#include <stdio.h>
#include <stdlib.h>
#define _BSD_SOURCE
#include <string.h>
#include "objload.h"
// TODO: !! vert_idx, norm_idx and uv_idx currently
// must be present for all faces
// TODO: face vertices is hard-coded to 3
#define OBJ_CHECK(x) do { \
OBJRES res = x; \
if(res != OBJ_SUCCESS) return res; \
} while(0)
static OBJRES data_allocate(FILE *fp, objload_t *obj);
static OBJRES data_load(FILE *fp, objload_t *obj);
static OBJRES data_load_vert(char *line, float vertex[3]);
static OBJRES data_load_norm(char *line, float normal[3]);
static OBJRES data_load_uv(char *line, float uvcoord[2]);
static OBJRES data_load_face(char *line, struct face face[3]);
static OBJRES data_load_face_entry(char *entry, struct face *face);
OBJRES obj_load(FILE *fp, objload_t *obj)
{
fseek(fp, 0, SEEK_SET);
OBJ_CHECK(data_allocate(fp, obj));
fseek(fp, 0, SEEK_SET);
OBJ_CHECK(data_load(fp, obj));
return OBJ_SUCCESS;
}
void obj_free(objload_t obj)
{
if(obj.nvert) free(obj.vertices);
if(obj.nnorm) free(obj.normals);
if(obj.nuv) free(obj.uvcoord);
if(obj.nfaces) free(obj.faces);
}
OBJRES obj_transfer_raw(objload_t obj, struct obj_struct_metadata metadata, size_t *nvbo, void *vbo)
{
if(vbo == NULL) {
*nvbo = obj.nfaces * 3;
return OBJ_SUCCESS;
}
for(size_t i = 0; i < *nvbo; i++)
{
if(metadata.exist_flag & OBJ_STRUCT_VERT_EXISTS) {
memcpy(vbo + metadata.vert_off,
obj.vertices[obj.faces[i/3][i%3].vertidx -1],
sizeof(*obj.vertices));
}
if(metadata.exist_flag & OBJ_STRUCT_NORM_EXISTS) {
memcpy(vbo + metadata.norm_off,
obj.normals[obj.faces[i/3][i%3].normidx -1],
sizeof(*obj.normals));
}
if(metadata.exist_flag & OBJ_STRUCT_UVTX_EXISTS) {
memcpy(vbo + metadata.uvtx_off,
obj.uvcoord[obj.faces[i/3][i%3].uvidx -1],
sizeof(*obj.uvcoord));
}
vbo += metadata.full_sz;
}
return OBJ_SUCCESS;
}
static OBJRES data_allocate(FILE *fp, objload_t *obj)
{
char line[256] = {0};
while(fgets(line, sizeof(line), fp))
{
// printf("%s\n", line);
switch(line[0]) {
case 'o':
break;
case 'v':
switch(line[1]) {
case ' ':
obj->nvert++;
break;
case 'n':
obj->nnorm++;
break;
case 't':
obj->nuv++;
break;
default:
return OBJ_LINE_UNKNOWN;
}
break;
case 'f':
obj->nfaces++;
break;
case 'l': case 'm':
case 's': case 'u':
break; // temporary
return OBJ_NOT_SUPPORTED_LINE;
case '#': case EOF:
break;
default:
return OBJ_LINE_UNKNOWN;
}
}
obj->vertices = calloc(obj->nvert, sizeof(*obj->vertices));
obj->normals = calloc(obj->nnorm, sizeof(*obj->normals));
obj->uvcoord = calloc(obj->nuv, sizeof(*obj->uvcoord));
obj->faces = calloc(obj->nfaces, sizeof(*obj->faces));
return OBJ_SUCCESS;
}
static OBJRES data_load(FILE *fp, objload_t *obj)
{
size_t vert_idx = 0;
size_t norm_idx = 0;
size_t uv_idx = 0;
size_t face_idx = 0;
char line[256] = {0};
while(fgets(line, sizeof(line), fp))
{
switch(line[0]) {
case 'v':
switch(line[1]) {
case ' ':
data_load_vert(line, obj->vertices[vert_idx++]);
break;
case 'n':
data_load_norm(line, obj->normals[norm_idx++]);
break;
case 't':
data_load_uv(line, obj->uvcoord[uv_idx++]);
break;
default:
break;
}
break;
case 'f':
data_load_face(line, obj->faces[face_idx++]);
break;
case '#':
break;
default:
break;
}
}
return OBJ_SUCCESS;
}
static OBJRES data_load_vert(char *line, float vertex[3])
{
char *saveptr;
strtok_r(line, " ", &saveptr);
vertex[0] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
vertex[1] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
vertex[2] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
return OBJ_SUCCESS;
}
static OBJRES data_load_norm(char *line, float normal[3])
{
char *saveptr;
strtok_r(line, " ", &saveptr);
normal[0] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
normal[1] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
normal[2] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
return OBJ_SUCCESS;
}
static OBJRES data_load_uv(char *line, float uvcoord[2])
{
char *saveptr;
strtok_r(line, " ", &saveptr);
uvcoord[0] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
uvcoord[1] = strtof(strtok_r(NULL, " ", &saveptr), NULL);
return OBJ_SUCCESS;
}
static OBJRES data_load_face(char *line, struct face face[3])
{
char *saveptr;
strtok_r(line, " ", &saveptr);
data_load_face_entry(strtok_r(NULL, " ", &saveptr), &face[0]);
data_load_face_entry(strtok_r(NULL, " ", &saveptr), &face[1]);
data_load_face_entry(strtok_r(NULL, " ", &saveptr), &face[2]);
return OBJ_SUCCESS;
}
static OBJRES data_load_face_entry(char *entry, struct face *face)
{
char *saveptr;
face->vertidx = strtoull(strtok_r(entry, "/", &saveptr), NULL, 10);
face->uvidx = strtoull(strtok_r(NULL, "/", &saveptr), NULL, 10);
face->normidx = strtoull(strtok_r(NULL, "/", &saveptr), NULL, 10);
return OBJ_SUCCESS;
}
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