1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include "obj.h"
ObjModel* ObjLoadModel(char *memory, size_t size)
{
char *p = NULL, *e = NULL;
ObjModel *ret = (ObjModel *) calloc(1, sizeof(ObjModel));
memset(ret, 0, sizeof(ObjModel));
p = memory;
e = memory + size;
/* count the number of normals, texcoords, vertices, and faces, line by line */
while (p != e)
{
if (memcmp(p, "vn", 2) == 0) ret->nNormal++;
else if (memcmp(p, "vt", 2) == 0) ret->nTexCoord++;
else if (memcmp(p, "v", 1) == 0) ret->nVertex++;
else if (memcmp(p, "f", 1) == 0) ret->nFace++;
while (*p++ != (char) 0x0a);
}
/* allocate memory for arrays */
ret->VertexArray = (ObjVertex *) malloc(sizeof(ObjVertex) * ret->nVertex);
ret->NormalArray = (ObjNormal *) malloc(sizeof(ObjNormal) * ret->nNormal);
ret->TexCoordArray = (ObjTexCoord *) malloc(sizeof(ObjTexCoord) * ret->nTexCoord);
ret->FaceArray = (ObjFace *) malloc(sizeof(ObjFace) * ret->nFace);
p = memory;
int nV = 0, nN = 0, nT = 0, nF = 0;
int nread = 0;
while (p != e)
{
if (memcmp(p, "vn", 2) == 0)
{
nread = sscanf(p, "vn %f %f %f", &ret->NormalArray[nN].x,
&ret->NormalArray[nN].y,
&ret->NormalArray[nN].z);
if (nread != 3)
printf("vn: read only %d instead of 3\n", nread);
nN++;
}
else if (memcmp(p, "vt", 2) == 0)
{
nread = sscanf(p, "vt %f %f", &ret->TexCoordArray[nT].u,
&ret->TexCoordArray[nT].v);
if (nread != 2)
printf("vt: read only %d instead of 2\n", nread);
nT++;
}
else if (memcmp(p, "v", 1) == 0) /* or *p == 'v' */
{
nread = sscanf(p, "v %f %f %f", &ret->VertexArray[nV].x,
&ret->VertexArray[nV].y,
&ret->VertexArray[nV].z);
if (nread != 3)
printf("v: read only %d instead of 3\n", nread);
nV++;
}
/* quad */
else if (memcmp(p, "f", 1) == 0) /* or *p == 'f' */
{
nread = sscanf(p, "f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d",
&ret->FaceArray[nF].Vertex[0],
&ret->FaceArray[nF].TexCoord[0],
&ret->FaceArray[nF].Normal[0],
&ret->FaceArray[nF].Vertex[1],
&ret->FaceArray[nF].TexCoord[1],
&ret->FaceArray[nF].Normal[1],
&ret->FaceArray[nF].Vertex[2],
&ret->FaceArray[nF].TexCoord[2],
&ret->FaceArray[nF].Normal[2],
&ret->FaceArray[nF].Vertex[3],
&ret->FaceArray[nF].TexCoord[3],
&ret->FaceArray[nF].Normal[3]);
if (nread != 12)
printf("f: read only %d instead of 12\n", nread);
nF++;
}
/* seek to a newline */
while (*p++ != (char) 0x0a);
}
/* sanity check */
if ((ret->nVertex != nV) || (ret->nNormal != nN) || (ret->nTexCoord != nT)
|| (ret->nFace != nF))
{
fprintf(stdout, "obj loader: warning, the number of scanned items does not equal to number of read\n");
if (ret->nVertex != nV)
fprintf(stdout, "vertices: scanned %d, read %d\n", ret->nVertex, nV);
if (ret->nNormal != nN)
fprintf(stdout, "normals: scanned %d, read %d\n", ret->nNormal, nN);
if (ret->nTexCoord != nT)
fprintf(stdout, "texcoords: scanned %d, read %d\n", ret->nTexCoord, nT);
if (ret->nFace != nF)
fprintf(stdout, "faces: scanned %d, read %d\n", ret->nFace, nF);
}
return ret;
}
size_t ObjLoadFile(char *szFileName, char **memory)
{
size_t bytes = 0;
FILE *file = fopen(szFileName, "rt");
if (file != NULL)
{
fseek(file, 0, SEEK_END);
size_t end = ftell(file);
fseek(file, 0, SEEK_SET);
*memory = (char *) malloc(end);
bytes = fread(*memory, sizeof(char), end, file);
fclose(file);
}
return bytes;
}
void ObjList(ObjModel *model)
{
int i;
printf("%d vertices\n", model->nVertex);
for (i = 0; i < model->nVertex; i++)
printf("v %f %f %f\n", model->VertexArray[i].x, model->VertexArray[i].y,
model->VertexArray[i].z);
printf("%d normal vectors\n", model->nNormal);
for (i = 0; i < model->nNormal; i++)
printf("v %f %f %f\n", model->NormalArray[i].x, model->NormalArray[i].y,
model->NormalArray[i].z);
printf("%d texture coordinates\n", model->nTexCoord);
for (i = 0; i < model->nTexCoord; i++)
printf("v %f %f\n", model->TexCoordArray[i].u, model->TexCoordArray[i].v);
printf("%d faces\n", model->nFace);
for (i = 0; i < model->nFace; i++)
{
printf("f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d\n",
model->FaceArray[i].Vertex[0],
model->FaceArray[i].TexCoord[0],
model->FaceArray[i].Normal[0],
model->FaceArray[i].Vertex[1],
model->FaceArray[i].TexCoord[1],
model->FaceArray[i].Normal[1],
model->FaceArray[i].Vertex[2],
model->FaceArray[i].TexCoord[2],
model->FaceArray[i].Normal[2],
model->FaceArray[i].Vertex[3],
model->FaceArray[i].TexCoord[3],
model->FaceArray[i].Normal[3]);
}
}
void ObjFree(ObjModel *model)
{
free(model->NormalArray);
free(model->TexCoordArray);
free(model->FaceArray);
free(model->VertexArray);
free(model);
}
|
