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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
#include <lua.h>
#include <lauxlib.h>
#include "util/util.h"
#include "import.h"
#define TINYOBJ_LOADER_C_IMPLEMENTATION
#include <tinyobj/tinyobj_loader_c.h>
void read_file(void *ctx, const char *filename, int is_mtl, const char *obj_filename, char **buf, size_t *len)
{
lua_State *L = ctx;
FILE *f = fopen(filename, "rb");
if (f == NULL) {
luaL_error(L, "failed to open file \"%s\"", filename);
}
fseek(f, 0, SEEK_END);
*len = ftell(f);
fseek(f, 0, SEEK_SET);
*buf = malloc(*len);
fread(*buf, *len, 1, f);
fclose(f);
}
static void push_float_array(lua_State *L, float *arr, size_t len)
{
lua_createtable(L, len, 0);
int tbl = lua_gettop(L);
for (int i=0; i<len; i++) {
lua_pushnumber(L, arr[i]);
lua_rawseti(L, tbl, i+1);
}
}
static void push_int_array(lua_State *L, int *arr, size_t len)
{
lua_createtable(L, len, 0);
int tbl = lua_gettop(L);
for (int i=0; i<len; i++) {
lua_pushinteger(L, arr[i]);
lua_rawseti(L, tbl, i+1);
}
}
static void push_material(lua_State *L, tinyobj_material_t mtl)
{
lua_createtable(L, 0, 18);
int tbl = lua_gettop(L);
lua_pushstring(L, mtl.name);
lua_setfield(L, tbl, "name");
push_float_array(L, mtl.ambient, 3);
lua_setfield(L, tbl, "ambient");
push_float_array(L, mtl.diffuse, 3);
lua_setfield(L, tbl, "diffuse");
push_float_array(L, mtl.specular, 3);
lua_setfield(L, tbl, "specular");
push_float_array(L, mtl.transmittance, 3);
lua_setfield(L, tbl, "transmittance");
push_float_array(L, mtl.emission, 3);
lua_setfield(L, tbl, "emission");
lua_pushnumber(L, mtl.shininess);
lua_setfield(L, tbl, "shininess");
lua_pushnumber(L, mtl.ior);
lua_setfield(L, tbl, "ior");
lua_pushnumber(L, mtl.dissolve);
lua_setfield(L, tbl, "dissolve");
lua_pushinteger(L, mtl.illum);
lua_setfield(L, tbl, "illum");
lua_pushinteger(L, mtl.pad0);
lua_setfield(L, tbl, "pad0");
lua_pushstring(L, mtl.ambient_texname);
lua_setfield(L, tbl, "ambient_texname");
lua_pushstring(L, mtl.diffuse_texname);
lua_setfield(L, tbl, "diffuse_texname");
lua_pushstring(L, mtl.specular_texname);
lua_setfield(L, tbl, "specular_texname");
lua_pushstring(L, mtl.specular_highlight_texname);
lua_setfield(L, tbl, "specular_highlight_texname");
lua_pushstring(L, mtl.bump_texname);
lua_setfield(L, tbl, "bump_texname");
lua_pushstring(L, mtl.displacement_texname);
lua_setfield(L, tbl, "displacement_texname");
lua_pushstring(L, mtl.alpha_texname);
lua_setfield(L, tbl, "alpha_texname");
}
int tinyobj_parse_obj_bind(lua_State *L)
{
tinyobj_attrib_t attrib;
tinyobj_shape_t *shapes;
size_t num_shapes;
tinyobj_material_t *materials;
size_t num_materials;
const char *file_name = luaL_checkstring(L, 1);
unsigned int flags = luaL_checkinteger(L, 2);
int result = tinyobj_parse_obj(
&attrib, &shapes, &num_shapes, &materials, &num_materials,
file_name, read_file, L, flags
);
if (result != TINYOBJ_SUCCESS) {
luaL_error(L, "failed to parse OBJ file \"%s\"", file_name);
}
/* push attrib */
lua_createtable(L, 0, 7);
int attrib_tbl = lua_gettop(L);
/* push attrib.pad0 */
lua_pushinteger(L, attrib.pad0);
lua_setfield(L, attrib_tbl, "pad0");
/* attrib.vertices */
push_float_array(L, attrib.vertices, 3*attrib.num_vertices);
lua_setfield(L, attrib_tbl, "vertices");
/* attrib.normals */
push_float_array(L, attrib.normals, 3*attrib.num_normals);
lua_setfield(L, attrib_tbl, "normals");
/* attrib.texcoords */
push_float_array(L, attrib.texcoords, 3*attrib.num_texcoords);
lua_setfield(L, attrib_tbl, "texcoords");
/* attrib.faces */
lua_createtable(L, attrib.num_faces, 0);
int face_array_tbl = lua_gettop(L);
for (int i=0; i<attrib.num_faces; i++) {
lua_createtable(L, 0, 3);
int face_tbl = lua_gettop(L);
/* push struct elements */
lua_pushinteger(L, attrib.faces[i].v_idx);
lua_setfield(L, face_tbl, "v_idx");
lua_pushinteger(L, attrib.faces[i].vt_idx);
lua_setfield(L, face_tbl, "vt_idx");
lua_pushinteger(L, attrib.faces[i].vn_idx);
lua_setfield(L, face_tbl, "vn_idx");
/* append table into array */
lua_rawseti(L, face_array_tbl, i+1);
}
lua_setfield(L, attrib_tbl, "faces");
/* attrib.face_num_verts */
push_int_array(L, attrib.face_num_verts, attrib.num_face_num_verts);
lua_setfield(L, attrib_tbl, "face_num_verts");
/* attrib.material_ids
* (we use the same len as face_num_verts because materials are per face)
*/
push_int_array(L, attrib.material_ids, attrib.num_face_num_verts);
lua_setfield(L, attrib_tbl, "material_ids");
/* shapes */
lua_createtable(L, num_shapes, 0);
int shape_array_tbl = lua_gettop(L);
for (int i=0; i<num_shapes; i++) {
lua_createtable(L, 0, 3);
int shape_tbl = lua_gettop(L);
/* struct elements */
lua_pushstring(L, shapes[i].name);
lua_setfield(L, shape_tbl, "name");
lua_pushinteger(L, shapes[i].face_offset);
lua_setfield(L, shape_tbl, "face_offset");
lua_pushinteger(L, shapes[i].length);
lua_setfield(L, shape_tbl, "length");
/* append to array */
lua_rawseti(L, shape_array_tbl, i+1);
}
/* materials */
lua_createtable(L, num_materials, 0);
int materials_array_tbl = lua_gettop(L);
for (int i=0; i<num_materials; i++) {
push_material(L, materials[i]);
lua_rawseti(L, materials_array_tbl, i+1);
}
return 3;
}
void setup_import(lua_State *L, int honey_tbl)
{
struct honey_tbl_t tinyobj[] = {
H_FUNC("parse_obj", tinyobj_parse_obj_bind),
H_INT("FLAG_TRIANGULATE", TINYOBJ_FLAG_TRIANGULATE),
H_END,
};
create_table(L, tinyobj);
lua_setfield(L, honey_tbl, "tinyobj");
}
|
