Pixel-Composer/scripts/obj_reader/obj_reader.gml
2022-12-12 15:08:03 +07:00

130 lines
No EOL
3 KiB
Text

function readObj(path) {
if(!file_exists(path)) return noone;
var _VB = [];
var _VBT = [];
var _VBN = [];
var mats = [];
var matIndex = [];
var v = ds_list_create();
var vt = ds_list_create();
var vn = ds_list_create();
var f = ds_list_create();
var ft = ds_list_create();
var fn = ds_list_create();
var file = file_text_open_read(path);
while(!file_text_eof(file)) {
var l = file_text_readln(file);
l = string_replace_all(l, "\n", "");
var sep = string_splice(l, " ");
if(array_length(sep) == 0 || sep[0] == "") continue;
switch(sep[0]) {
case "v" :
ds_list_add(v, [ toNumber(sep[1]), toNumber(sep[2]), toNumber(sep[3]) ]);
break;
case "vt" :
ds_list_add(vt, [ 1 + toNumber(sep[1]), -toNumber(sep[2]) ]);
break;
case "vn" :
ds_list_add(vn, [ toNumber(sep[1]), toNumber(sep[2]), toNumber(sep[3]) ]);
break;
case "f" :
var f1 = string_splice(sep[1], "/");
var f2 = string_splice(sep[2], "/");
var f3 = string_splice(sep[3], "/");
ds_list_add(f, [f1[0], f2[0], f3[0]]);
ds_list_add(ft, [f1[1], f2[1], f3[1]]);
ds_list_add(fn, [f1[2], f2[2], f3[2]]);
break;
case "usemtl" :
array_push_unique(mats, sep[1]);
array_push(matIndex, array_find(mats, sep[1]));
if(!ds_list_empty(f)) {
array_push(_VB, f);
array_push(_VBT, ft);
array_push(_VBN, fn);
f = ds_list_create();
ft = ds_list_create();
fn = ds_list_create();
}
break;
}
}
if(!ds_list_empty(f)) {
array_push(_VB, f);
array_push(_VBT, ft);
array_push(_VBN, fn);
}
file_text_close(file);
#region centralize vertex
var cv = [0, 0, 0];
var vertex = ds_list_size(v);
for( var i = 0; i < vertex; i++ ) {
var _v = v[| i];
cv[0] += _v[0];
cv[1] += _v[1];
cv[2] += _v[2];
}
cv[0] /= vertex;
cv[1] /= vertex;
cv[2] /= vertex;
for( var i = 0; i < ds_list_size(v); i++ ) {
v[| i][0] -= cv[0];
v[| i][1] -= cv[1];
v[| i][2] -= cv[2];
}
#endregion
var VBS = [];
for(var i = 0; i < array_length(_VB); i++) {
var VB = vertex_create_buffer();
vertex_begin(VB, FORMAT_PNT);
var face = _VB[i];
var facet = _VBT[i];
var facen = _VBN[i];
for(var j = 0; j < ds_list_size(face); j++) {
var _f = face[| j];
var _f1 = v[| _f[0] - 1];
var _f2 = v[| _f[1] - 1];
var _f3 = v[| _f[2] - 1];
var _ft = facet[| j];
var _ft1 = vt[| _ft[0] - 1];
var _ft2 = vt[| _ft[1] - 1];
var _ft3 = vt[| _ft[2] - 1];
var _fn = facen[| j];
var _fn1 = vn[| _fn[0] - 1];
var _fn2 = vn[| _fn[1] - 1];
var _fn3 = vn[| _fn[2] - 1];
vertex_add_pnt(VB, _f1, _fn1, _ft1 );
vertex_add_pnt(VB, _f2, _fn2, _ft2 );
vertex_add_pnt(VB, _f3, _fn3, _ft3 );
}
vertex_end(VB);
vertex_freeze(VB);
array_push(VBS, VB);
ds_list_destroy(face);
ds_list_destroy(facet);
}
ds_list_destroy(v);
ds_list_destroy(vt);
ds_list_destroy(vn);
ds_list_destroy(f);
ds_list_destroy(ft);
ds_list_destroy(fn);
return [ VBS, mats, matIndex ];
}