596 lines
13 KiB
V
596 lines
13 KiB
V
/**********************************************************************
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*
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* .obj loader
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*
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* Copyright (c) 2021 Dario Deledda. All rights reserved.
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* Use of this source code is governed by an MIT license
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* that can be found in the LICENSE file.
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*
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* TODO:
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**********************************************************************/
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module obj
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import gg.m4
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import strconv
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enum F_state {
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start
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first
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ints
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decimals
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exp_start
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exp_sign
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exp_int
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}
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// read a int from a string
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fn get_int(s string, start_index int) (int, int) {
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mut i := start_index
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mut res := 0
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mut sgn := 1
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mut state := F_state.start
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for true {
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if i >= s.len {
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break
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}
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c := s[i]
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if state == .start {
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match c {
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`+` {
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i++
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state = .ints
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continue
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}
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`-` {
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sgn = -1
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i++
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state = .ints
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continue
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}
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`0`...`9` {
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state = .ints
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}
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` `, `\t` {
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i++
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continue
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}
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else { // no number found
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break
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}
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}
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}
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if state == .ints {
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match c {
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`0`...`9` {
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// println("$res => ${(int(c) - 48)}")
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res = res * 10 + (int(c) - 48)
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i++
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continue
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}
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else {
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break
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}
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}
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}
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}
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// println("---")
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return res * sgn, i
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}
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// reas a float number from a string
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fn get_float(s string, start_index int) (f64, int) {
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mut i1 := start_index //+ 1
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for i1 < s.len && s[i1] in [` `, `\t`] {
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i1++
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}
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mut i := i1
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for i < s.len {
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if s[i] in [` `, `\t`] {
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break
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}
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i++
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}
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// println(" get_float: ($start_index,$i) [${s[start_index..i]}]")
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// f_res := strconv.atof_quick(s[start_index..i])
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f_res := strconv.atof_quick(s[i1..i])
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return f_res, i
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}
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// read 3 f32 in sequence from a string
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fn parse_3f(row string, start_index int) m4.Vec4 {
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// println(row)
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mut i := start_index //+ 1
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mut f1 := f64(0)
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mut f2 := f64(0)
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f0, mut p := get_float(row, i)
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// print("Here f0: $f0 $p ")
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f1, p = get_float(row, p + 1)
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// print("Here f1: $f1 $p ")
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f2, p = get_float(row, p + 1)
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// print("Here f2: $f2 $p ")
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return m4.Vec4{
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e: [f32(f0), f32(f1), f32(f2), 1]!
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}
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}
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// reas a sequence of f32 from a string
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fn (mut m ObjPart) parse_floats(row string, start_index int) m4.Vec4 {
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mut i := start_index //+ 1
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mut res_f := f64(0)
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mut res := m4.Vec4{
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e: [f32(0), 0, 0, 1]!
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}
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mut c := 0
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for true {
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res_f, i = get_float(row, i)
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unsafe {
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res.e[c] = f32(res_f)
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}
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c++
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i++
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if i >= row.len {
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break
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}
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}
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return res
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}
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// read and manage all the faes from an .obj file data
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fn (mut p Part) parse_faces(row string, start_index int, obj ObjPart) {
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mut i := start_index + 1
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mut res := [][3]int{}
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mut v := 0
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mut t := 0
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mut n := 0
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// println("row: ${row[i..]}")
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for true {
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t = 0
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n = 0
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if i >= row.len {
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break
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}
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mut c := row[i]
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if (c > `9` || c < `0`) && c != `-` {
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i++
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continue
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}
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v, i = get_int(row, i)
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if i < row.len && row[i] == `/` {
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if row[i + 1] != `/` {
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t, i = get_int(row, i + 1)
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if i < row.len && row[i] == `/` {
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n, i = get_int(row, i + 1)
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}
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} else {
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i++
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n, i = get_int(row, i + 1)
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}
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}
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// manage negative indexes
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// NOTE: not well suporeted now
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if v < 0 {
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// println("${obj.v.len} ${obj.v.len-c}")
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v = obj.v.len - v + 1
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// exit(0)
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}
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if n < 0 {
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n = obj.vn.len - n + 1
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}
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if t < 0 {
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t = obj.vt.len - t + 1
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}
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res << [v - 1, n - 1, t - 1]!
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}
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// println("ok res: ${res}")
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// println(p.faces.len)
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p.faces << res
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}
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// parse the obj file, if single_material is true it use only one default material
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pub fn (mut obj_part ObjPart) parse_obj_buffer(rows []string, single_material bool) {
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mut mat_count := 0
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mut row_count := 0
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default_part := Part{
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name: 'default part'
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}
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obj_part.part << default_part
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// println("OBJ file has ${rows.len} rows")
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for c, row in rows {
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// println("$c $row")
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mut i := 0
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row_count++
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for true {
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if i >= row.len {
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break
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}
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match row[i] {
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`s` {
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break
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}
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`m` {
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if row[i..i + 6] == 'mtllib' {
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obj_part.material_file = row[i + 7..].trim_space()
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obj_part.load_materials()
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}
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break
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}
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`o`, `g` {
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mut part := Part{}
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part.name = row[i + 1..].trim_space()
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obj_part.part << part
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mat_count = 0
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break
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}
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`u` {
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if single_material == false && row[i..i + 6] == 'usemtl' {
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material := row[i + 7..].trim_space()
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// println("material: $material")
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// manage multiple materials in an part
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if obj_part.part[obj_part.part.len - 1].material.len > 0 {
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mat_count++
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mut part := Part{}
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if mat_count > 1 {
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li := obj_part.part[obj_part.part.len - 1].name.last_index('_m') or {
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obj_part.part[obj_part.part.len - 1].name.len - 1
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}
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part.name = obj_part.part[obj_part.part.len - 1].name[..li] +
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'_m${mat_count:02}'
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} else {
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part.name = obj_part.part[obj_part.part.len - 1].name + '_m01'
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}
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obj_part.part << part
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}
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obj_part.part[obj_part.part.len - 1].material = material
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}
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break
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}
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`v` {
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i++
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match row[i] {
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// normals
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`n` {
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obj_part.vn << parse_3f(row, i + 2)
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// println("Vertex line: $c")
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break
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}
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// parameteres uvw
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`p` {
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obj_part.vp << parse_3f(row, i + 2)
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// println("Vertex line: ${obj_part.vp.len}")
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break
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}
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// texture uvw
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`t` {
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obj_part.vt << obj_part.parse_floats(row, i + 2)
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// println("Vertex line: $c")
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break
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}
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else {
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obj_part.v << parse_3f(row, i + 1)
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// println("$row => ${obj_part.v[obj_part.v.len-1]}")
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break
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}
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}
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}
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`f` {
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// println("$c $row")
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obj_part.part[obj_part.part.len - 1].parse_faces(row, i, obj_part)
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// println(obj_part.part[obj_part.part.len - 1].faces.len)
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// println("Faces line: $c")
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break
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}
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// end of the line, comments
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`\n`, `#` {
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break
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}
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else {}
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}
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i++
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}
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// if c == 2 { break }
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if c % 100000 == 0 && c > 0 {
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println('$c rows parsed')
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}
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}
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println('$row_count .obj Rows parsed')
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// remove default part if empty
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if obj_part.part.len > 1 && obj_part.part[0].faces.len == 0 {
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obj_part.part = obj_part.part[1..]
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}
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}
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// load the materials if found the .mtl file
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fn (mut obj_part ObjPart) load_materials() {
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rows := read_lines_from_file(obj_part.material_file)
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println('Material file [$obj_part.material_file] $rows.len Rows.')
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for row in rows {
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// println("$row")
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mut i := 0
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for true {
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if i >= row.len {
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break
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}
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match row[i] {
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`n` {
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if row[i..i + 6] == 'newmtl' {
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name := row[i + 6..].trim_space()
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mut mat := Material{
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name: name
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}
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obj_part.mat << mat
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break
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}
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}
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`K` {
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if row[i + 1] !in [`a`, `d`, `e`, `s`] {
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break
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}
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k_name := row[i..i + 2]
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i += 3
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value := parse_3f(row, i)
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obj_part.mat[obj_part.mat.len - 1].ks[k_name] = value
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break
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}
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`N` {
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n_name := row[i..i + 2]
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i += 3
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value, _ := get_float(row, i)
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obj_part.mat[obj_part.mat.len - 1].ns[n_name] = f32(value)
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break
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}
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`m` {
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if row[i..i + 4] == 'map_' {
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name := row[i..i + 6]
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if (i + 7) < row.len {
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file_name := row[i + 7..].trim_space()
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obj_part.mat[obj_part.mat.len - 1].maps[name] = file_name
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}
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break
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}
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}
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// trasparency
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`d` {
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if row[i + 1] == ` ` {
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value, _ := get_float(row, i + 2)
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obj_part.mat[obj_part.mat.len - 1].ns['Tr'] = f32(value)
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}
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}
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`T` {
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if row[i + 1] == `r` {
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value, _ := get_float(row, i + 3)
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obj_part.mat[obj_part.mat.len - 1].ns['Tr'] = f32(1.0 - value)
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}
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}
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// end of the line, comments
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`\n`, `#` {
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break
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}
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` `, `\t` {
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i++
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continue
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}
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else {
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break
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}
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}
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i++
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}
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}
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// create map material name => material index
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for i, m in obj_part.mat {
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if m.name !in obj_part.mat_map {
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obj_part.mat_map[m.name] = i
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}
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}
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println('Material Loading Done!')
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}
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//==============================================================================
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// Sokol data
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//==============================================================================
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// vertex data struct
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pub struct Vertex_pnct {
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pub mut:
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x f32 // poistion
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y f32
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z f32
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nx f32 // normal
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ny f32
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nz f32
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color u32 = 0xFFFFFFFF // color
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u f32 // uv
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v f32
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// u u16 // for compatibility with D3D11
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// v u16 // for compatibility with D3D11
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}
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// struct used to pass the data to the sokol calls
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pub struct Skl_buffer {
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pub mut:
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vbuf []Vertex_pnct
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ibuf []u32
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n_vertex u32
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}
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// transforms data from .obj format to buffer ready to be used in the render
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pub fn (mut obj_part ObjPart) get_buffer(in_part_list []int) Skl_buffer {
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// in_part := 0
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mut v_count_index := 0
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mut out_buf := Skl_buffer{}
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mut cache := map[string]int{}
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mut cache_hit := 0
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// has_normals := obj_part.vn.len > 0
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// has_uvs := obj_part.vt.len > 0
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for in_part in in_part_list {
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part := obj_part.part[in_part]
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for fc, face in part.faces {
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// println("$fc $face")
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// default 3 faces
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mut v_seq := [0, 1, 2]
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if face.len == 4 {
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v_seq = [0, 1, 2, 0, 2, 3]
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}
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// if big faces => use the fan of triangles as solution
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// Note: this trick doesn't work with concave faces
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if face.len > 4 {
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v_seq = []
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mut i := 1
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for i < (face.len - 1) {
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v_seq << 0
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v_seq << i
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v_seq << (i + 1)
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i++
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}
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// println("BIG FACES! ${fc} ${face.len} v_seq:${v_seq.len}")
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}
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// no vertex index, generate normals
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if face[0][1] == -1 && face.len >= 3 {
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mut v_count := 0
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v0 := face[v_count + 0][0]
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v1 := face[v_count + 1][0]
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v2 := face[v_count + 2][0]
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vec0 := obj_part.v[v2] - obj_part.v[v1]
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vec1 := obj_part.v[v0] - obj_part.v[v1]
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tmp_normal := vec0 % vec1
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for v_count < face.len {
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obj_part.vn << tmp_normal
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obj_part.part[in_part].faces[fc][v_count][1] = obj_part.vn.len - 1
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v_count++
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}
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}
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for vertex_index in v_seq {
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// position
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if vertex_index >= face.len {
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continue
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}
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v_index := face[vertex_index][0] // vertex index
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n_index := face[vertex_index][1] // normal index
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t_index := face[vertex_index][2] // uv texture index
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key := '${v_index}_${n_index}_$t_index'
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if key !in cache {
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cache[key] = v_count_index
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mut pnct := Vertex_pnct{
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x: obj_part.v[v_index].e[0]
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y: obj_part.v[v_index].e[1]
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z: obj_part.v[v_index].e[2]
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}
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// normal
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if n_index >= 0 {
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pnct.nx = obj_part.vn[n_index].e[0]
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pnct.ny = obj_part.vn[n_index].e[1]
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pnct.nz = obj_part.vn[n_index].e[2]
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}
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// texture uv
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if t_index >= 0 {
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pnct.u = obj_part.vt[t_index].e[0]
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pnct.v = obj_part.vt[t_index].e[1]
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}
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out_buf.vbuf << pnct
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out_buf.ibuf << u32(v_count_index)
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v_count_index++
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} else {
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// println("Cache used! $key")
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out_buf.ibuf << u32(cache[key])
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cache_hit++
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}
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}
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}
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}
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/*
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println("------------")
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for c1, x1 in out_buf.vbuf[..10] {
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println("$c1 $x1")
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}
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println(out_buf.ibuf[..10])
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*/
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// println("vbuf size: ${out_buf.vbuf.len} ibuf size: ${out_buf.ibuf.len} Cache hit: $cache_hit")
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out_buf.n_vertex = u32(out_buf.ibuf.len)
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return out_buf
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}
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//==============================================================================
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// Utility
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//==============================================================================
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// print on the console the summary of the .obj model loaded
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pub fn (obj_part ObjPart) summary() {
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println('---- Stats ----')
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println('vertices: $obj_part.v.len')
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println('normals : $obj_part.vn.len')
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println('uv : $obj_part.vt.len')
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println('parts : $obj_part.part.len')
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// Parts
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println('---- Parts ----')
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for c, x in obj_part.part {
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println('${c:3} [${x.name:-16}] mat:[${x.material:-10}] ${x.faces.len:7} faces')
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}
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// Materials
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println('---- Materials ----')
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println('Material dict: $obj_part.mat_map.keys()')
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for c, mat in obj_part.mat {
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println('${c:3} [${mat.name:-16}]')
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for k, v in mat.ks {
|
|
print('$k = $v')
|
|
}
|
|
for k, v in mat.ns {
|
|
println('$k = $v')
|
|
}
|
|
for k, v in mat.maps {
|
|
println('$k = $v')
|
|
}
|
|
}
|
|
}
|
|
|
|
// debug test function, do not remove.
|
|
pub fn tst() {
|
|
/*
|
|
//fname := "capsule.obj"
|
|
//fname := "Forklift.obj"
|
|
fname := "cube.obj"
|
|
//fname := "Orange Robot 3D ObjPart.obj"
|
|
|
|
mut obj := ObjPart{}
|
|
buf := os.read_lines(fname) or { panic(err.msg) }
|
|
obj.parse_obj_buffer(buf)
|
|
obj.summary()
|
|
*/
|
|
/*
|
|
a :="f 7048 7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7003"
|
|
mut f1 := 0
|
|
mut f2 := 0
|
|
f0,mut p := get_int(a,1)
|
|
f1, p = get_int(a,p)
|
|
f2, p = get_int(a,p)
|
|
println("res: ${f0} ${f1} ${f2}")
|
|
*/
|
|
/*
|
|
a :="v -0 0.107769 -0.755914"
|
|
println("${parse_3f(a,1)}")
|
|
*/
|
|
/*
|
|
ort := m4.ortho(0,300,0,200,0,0)
|
|
println(ort)
|
|
a := m4.vec3(0,0,0)
|
|
println("a: $a")
|
|
res := m4.mul_vec(ort, a)
|
|
println("res:\n${res}")
|
|
*/
|
|
s := 'K 1 1 1'
|
|
r := strconv.atof_quick(s[1..s.len - 1])
|
|
println(r)
|
|
}
|