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#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)
{
FILE *f = fopen(filename, "rb");
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");
}
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