mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
596 lines
13 KiB
V
596 lines
13 KiB
V
/**********************************************************************
|
|
*
|
|
* .obj loader
|
|
*
|
|
* Copyright (c) 2021 Dario Deledda. All rights reserved.
|
|
* Use of this source code is governed by an MIT license
|
|
* that can be found in the LICENSE file.
|
|
*
|
|
* TODO:
|
|
**********************************************************************/
|
|
module obj
|
|
|
|
import gg.m4
|
|
import strconv
|
|
|
|
enum F_state {
|
|
start
|
|
first
|
|
ints
|
|
decimals
|
|
exp_start
|
|
exp_sign
|
|
exp_int
|
|
}
|
|
|
|
// read a int from a string
|
|
fn get_int(s string, start_index int) (int, int) {
|
|
mut i := start_index
|
|
mut res := 0
|
|
mut sgn := 1
|
|
|
|
mut state := F_state.start
|
|
for true {
|
|
if i >= s.len {
|
|
break
|
|
}
|
|
c := s[i]
|
|
if state == .start {
|
|
match c {
|
|
`+` {
|
|
i++
|
|
state = .ints
|
|
continue
|
|
}
|
|
`-` {
|
|
sgn = -1
|
|
i++
|
|
state = .ints
|
|
continue
|
|
}
|
|
`0`...`9` {
|
|
state = .ints
|
|
}
|
|
` `, `\t` {
|
|
i++
|
|
continue
|
|
}
|
|
else { // no number found
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
if state == .ints {
|
|
match c {
|
|
`0`...`9` {
|
|
// println("$res => ${(int(c) - 48)}")
|
|
res = res * 10 + (int(c) - 48)
|
|
i++
|
|
continue
|
|
}
|
|
else {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// println("---")
|
|
return res * sgn, i
|
|
}
|
|
|
|
// reas a float number from a string
|
|
fn get_float(s string, start_index int) (f64, int) {
|
|
mut i1 := start_index //+ 1
|
|
for i1 < s.len && s[i1] in [` `, `\t`] {
|
|
i1++
|
|
}
|
|
mut i := i1
|
|
for i < s.len {
|
|
if s[i] in [` `, `\t`] {
|
|
break
|
|
}
|
|
i++
|
|
}
|
|
// println(" get_float: ($start_index,$i) [${s[start_index..i]}]")
|
|
// f_res := strconv.atof_quick(s[start_index..i])
|
|
f_res := strconv.atof_quick(s[i1..i])
|
|
return f_res, i
|
|
}
|
|
|
|
// read 3 f32 in sequence from a string
|
|
fn parse_3f(row string, start_index int) m4.Vec4 {
|
|
// println(row)
|
|
mut i := start_index //+ 1
|
|
mut f1 := f64(0)
|
|
mut f2 := f64(0)
|
|
f0, mut p := get_float(row, i)
|
|
// print("Here f0: $f0 $p ")
|
|
f1, p = get_float(row, p + 1)
|
|
// print("Here f1: $f1 $p ")
|
|
f2, p = get_float(row, p + 1)
|
|
// print("Here f2: $f2 $p ")
|
|
return m4.Vec4{
|
|
e: [f32(f0), f32(f1), f32(f2), 1]!
|
|
}
|
|
}
|
|
|
|
// reas a sequence of f32 from a string
|
|
fn (mut m ObjPart) parse_floats(row string, start_index int) m4.Vec4 {
|
|
mut i := start_index //+ 1
|
|
mut res_f := f64(0)
|
|
mut res := m4.Vec4{
|
|
e: [f32(0), 0, 0, 1]!
|
|
}
|
|
mut c := 0
|
|
for true {
|
|
res_f, i = get_float(row, i)
|
|
unsafe {
|
|
res.e[c] = f32(res_f)
|
|
}
|
|
c++
|
|
i++
|
|
if i >= row.len {
|
|
break
|
|
}
|
|
}
|
|
return res
|
|
}
|
|
|
|
// read and manage all the faes from an .obj file data
|
|
fn (mut p Part) parse_faces(row string, start_index int, obj ObjPart) {
|
|
mut i := start_index + 1
|
|
mut res := [][3]int{}
|
|
mut v := 0
|
|
mut t := 0
|
|
mut n := 0
|
|
// println("row: ${row[i..]}")
|
|
for true {
|
|
t = 0
|
|
n = 0
|
|
if i >= row.len {
|
|
break
|
|
}
|
|
mut c := row[i]
|
|
if (c > `9` || c < `0`) && c != `-` {
|
|
i++
|
|
continue
|
|
}
|
|
v, i = get_int(row, i)
|
|
if i < row.len && row[i] == `/` {
|
|
if row[i + 1] != `/` {
|
|
t, i = get_int(row, i + 1)
|
|
if i < row.len && row[i] == `/` {
|
|
n, i = get_int(row, i + 1)
|
|
}
|
|
} else {
|
|
i++
|
|
n, i = get_int(row, i + 1)
|
|
}
|
|
}
|
|
// manage negative indexes
|
|
// NOTE: not well suporeted now
|
|
if v < 0 {
|
|
// println("${obj.v.len} ${obj.v.len-c}")
|
|
v = obj.v.len - v + 1
|
|
// exit(0)
|
|
}
|
|
if n < 0 {
|
|
n = obj.vn.len - n + 1
|
|
}
|
|
if t < 0 {
|
|
t = obj.vt.len - t + 1
|
|
}
|
|
res << [v - 1, n - 1, t - 1]!
|
|
}
|
|
// println("ok res: ${res}")
|
|
// println(p.faces.len)
|
|
p.faces << res
|
|
}
|
|
|
|
// parse the obj file, if single_material is true it use only one default material
|
|
pub fn (mut obj_part ObjPart) parse_obj_buffer(rows []string, single_material bool) {
|
|
mut mat_count := 0
|
|
mut row_count := 0
|
|
default_part := Part{
|
|
name: 'default part'
|
|
}
|
|
obj_part.part << default_part
|
|
// println("OBJ file has ${rows.len} rows")
|
|
for c, row in rows {
|
|
// println("$c $row")
|
|
mut i := 0
|
|
row_count++
|
|
for true {
|
|
if i >= row.len {
|
|
break
|
|
}
|
|
match row[i] {
|
|
`s` {
|
|
break
|
|
}
|
|
`m` {
|
|
if row[i..i + 6] == 'mtllib' {
|
|
obj_part.material_file = row[i + 7..].trim_space()
|
|
obj_part.load_materials()
|
|
}
|
|
break
|
|
}
|
|
`o`, `g` {
|
|
mut part := Part{}
|
|
part.name = row[i + 1..].trim_space()
|
|
obj_part.part << part
|
|
mat_count = 0
|
|
break
|
|
}
|
|
`u` {
|
|
if single_material == false && row[i..i + 6] == 'usemtl' {
|
|
material := row[i + 7..].trim_space()
|
|
// println("material: $material")
|
|
// manage multiple materials in an part
|
|
if obj_part.part[obj_part.part.len - 1].material.len > 0 {
|
|
mat_count++
|
|
mut part := Part{}
|
|
if mat_count > 1 {
|
|
li := obj_part.part[obj_part.part.len - 1].name.last_index('_m') or {
|
|
obj_part.part[obj_part.part.len - 1].name.len - 1
|
|
}
|
|
part.name = obj_part.part[obj_part.part.len - 1].name[..li] +
|
|
'_m${mat_count:02}'
|
|
} else {
|
|
part.name = obj_part.part[obj_part.part.len - 1].name + '_m01'
|
|
}
|
|
obj_part.part << part
|
|
}
|
|
obj_part.part[obj_part.part.len - 1].material = material
|
|
}
|
|
break
|
|
}
|
|
`v` {
|
|
i++
|
|
match row[i] {
|
|
// normals
|
|
`n` {
|
|
obj_part.vn << parse_3f(row, i + 2)
|
|
// println("Vertex line: $c")
|
|
break
|
|
}
|
|
// parameteres uvw
|
|
`p` {
|
|
obj_part.vp << parse_3f(row, i + 2)
|
|
// println("Vertex line: ${obj_part.vp.len}")
|
|
break
|
|
}
|
|
// texture uvw
|
|
`t` {
|
|
obj_part.vt << obj_part.parse_floats(row, i + 2)
|
|
// println("Vertex line: $c")
|
|
break
|
|
}
|
|
else {
|
|
obj_part.v << parse_3f(row, i + 1)
|
|
// println("$row => ${obj_part.v[obj_part.v.len-1]}")
|
|
break
|
|
}
|
|
}
|
|
}
|
|
`f` {
|
|
// println("$c $row")
|
|
obj_part.part[obj_part.part.len - 1].parse_faces(row, i, obj_part)
|
|
// println(obj_part.part[obj_part.part.len - 1].faces.len)
|
|
// println("Faces line: $c")
|
|
break
|
|
}
|
|
// end of the line, comments
|
|
`\n`, `#` {
|
|
break
|
|
}
|
|
else {}
|
|
}
|
|
i++
|
|
}
|
|
// if c == 2 { break }
|
|
if c % 100000 == 0 && c > 0 {
|
|
println('$c rows parsed')
|
|
}
|
|
}
|
|
println('$row_count .obj Rows parsed')
|
|
// remove default part if empty
|
|
if obj_part.part.len > 1 && obj_part.part[0].faces.len == 0 {
|
|
obj_part.part = obj_part.part[1..]
|
|
}
|
|
}
|
|
|
|
// load the materials if found the .mtl file
|
|
fn (mut obj_part ObjPart) load_materials() {
|
|
rows := read_lines_from_file(obj_part.material_file)
|
|
println('Material file [$obj_part.material_file] $rows.len Rows.')
|
|
for row in rows {
|
|
// println("$row")
|
|
mut i := 0
|
|
for true {
|
|
if i >= row.len {
|
|
break
|
|
}
|
|
match row[i] {
|
|
`n` {
|
|
if row[i..i + 6] == 'newmtl' {
|
|
name := row[i + 6..].trim_space()
|
|
mut mat := Material{
|
|
name: name
|
|
}
|
|
obj_part.mat << mat
|
|
break
|
|
}
|
|
}
|
|
`K` {
|
|
if row[i + 1] !in [`a`, `d`, `e`, `s`] {
|
|
break
|
|
}
|
|
k_name := row[i..i + 2]
|
|
i += 3
|
|
value := parse_3f(row, i)
|
|
obj_part.mat[obj_part.mat.len - 1].ks[k_name] = value
|
|
break
|
|
}
|
|
`N` {
|
|
n_name := row[i..i + 2]
|
|
i += 3
|
|
value, _ := get_float(row, i)
|
|
obj_part.mat[obj_part.mat.len - 1].ns[n_name] = f32(value)
|
|
break
|
|
}
|
|
`m` {
|
|
if row[i..i + 4] == 'map_' {
|
|
name := row[i..i + 6]
|
|
if (i + 7) < row.len {
|
|
file_name := row[i + 7..].trim_space()
|
|
obj_part.mat[obj_part.mat.len - 1].maps[name] = file_name
|
|
}
|
|
break
|
|
}
|
|
}
|
|
// trasparency
|
|
`d` {
|
|
if row[i + 1] == ` ` {
|
|
value, _ := get_float(row, i + 2)
|
|
obj_part.mat[obj_part.mat.len - 1].ns['Tr'] = f32(value)
|
|
}
|
|
}
|
|
`T` {
|
|
if row[i + 1] == `r` {
|
|
value, _ := get_float(row, i + 3)
|
|
obj_part.mat[obj_part.mat.len - 1].ns['Tr'] = f32(1.0 - value)
|
|
}
|
|
}
|
|
// end of the line, comments
|
|
`\n`, `#` {
|
|
break
|
|
}
|
|
` `, `\t` {
|
|
i++
|
|
continue
|
|
}
|
|
else {
|
|
break
|
|
}
|
|
}
|
|
i++
|
|
}
|
|
}
|
|
|
|
// create map material name => material index
|
|
for i, m in obj_part.mat {
|
|
if m.name !in obj_part.mat_map {
|
|
obj_part.mat_map[m.name] = i
|
|
}
|
|
}
|
|
|
|
println('Material Loading Done!')
|
|
}
|
|
|
|
//==============================================================================
|
|
// Sokol data
|
|
//==============================================================================
|
|
|
|
// vertex data struct
|
|
pub struct Vertex_pnct {
|
|
pub mut:
|
|
x f32 // poistion
|
|
y f32
|
|
z f32
|
|
nx f32 // normal
|
|
ny f32
|
|
nz f32
|
|
color u32 = 0xFFFFFFFF // color
|
|
u f32 // uv
|
|
v f32
|
|
// u u16 // for compatibility with D3D11
|
|
// v u16 // for compatibility with D3D11
|
|
}
|
|
|
|
// struct used to pass the data to the sokol calls
|
|
pub struct Skl_buffer {
|
|
pub mut:
|
|
vbuf []Vertex_pnct
|
|
ibuf []u32
|
|
n_vertex u32
|
|
}
|
|
|
|
// transforms data from .obj format to buffer ready to be used in the render
|
|
pub fn (mut obj_part ObjPart) get_buffer(in_part_list []int) Skl_buffer {
|
|
// in_part := 0
|
|
mut v_count_index := 0
|
|
mut out_buf := Skl_buffer{}
|
|
|
|
mut cache := map[string]int{}
|
|
mut cache_hit := 0
|
|
|
|
// has_normals := obj_part.vn.len > 0
|
|
// has_uvs := obj_part.vt.len > 0
|
|
|
|
for in_part in in_part_list {
|
|
part := obj_part.part[in_part]
|
|
for fc, face in part.faces {
|
|
// println("$fc $face")
|
|
// default 3 faces
|
|
mut v_seq := [0, 1, 2]
|
|
if face.len == 4 {
|
|
v_seq = [0, 1, 2, 0, 2, 3]
|
|
}
|
|
|
|
// if big faces => use the fan of triangles as solution
|
|
// Note: this trick doesn't work with concave faces
|
|
if face.len > 4 {
|
|
v_seq = []
|
|
mut i := 1
|
|
for i < (face.len - 1) {
|
|
v_seq << 0
|
|
v_seq << i
|
|
v_seq << (i + 1)
|
|
i++
|
|
}
|
|
// println("BIG FACES! ${fc} ${face.len} v_seq:${v_seq.len}")
|
|
}
|
|
|
|
// no vertex index, generate normals
|
|
if face[0][1] == -1 && face.len >= 3 {
|
|
mut v_count := 0
|
|
v0 := face[v_count + 0][0]
|
|
v1 := face[v_count + 1][0]
|
|
v2 := face[v_count + 2][0]
|
|
|
|
vec0 := obj_part.v[v2] - obj_part.v[v1]
|
|
vec1 := obj_part.v[v0] - obj_part.v[v1]
|
|
tmp_normal := vec0 % vec1
|
|
|
|
for v_count < face.len {
|
|
obj_part.vn << tmp_normal
|
|
obj_part.part[in_part].faces[fc][v_count][1] = obj_part.vn.len - 1
|
|
v_count++
|
|
}
|
|
}
|
|
|
|
for vertex_index in v_seq {
|
|
// position
|
|
if vertex_index >= face.len {
|
|
continue
|
|
}
|
|
v_index := face[vertex_index][0] // vertex index
|
|
n_index := face[vertex_index][1] // normal index
|
|
t_index := face[vertex_index][2] // uv texture index
|
|
key := '${v_index}_${n_index}_$t_index'
|
|
if key !in cache {
|
|
cache[key] = v_count_index
|
|
mut pnct := Vertex_pnct{
|
|
x: obj_part.v[v_index].e[0]
|
|
y: obj_part.v[v_index].e[1]
|
|
z: obj_part.v[v_index].e[2]
|
|
}
|
|
// normal
|
|
if n_index >= 0 {
|
|
pnct.nx = obj_part.vn[n_index].e[0]
|
|
pnct.ny = obj_part.vn[n_index].e[1]
|
|
pnct.nz = obj_part.vn[n_index].e[2]
|
|
}
|
|
// texture uv
|
|
if t_index >= 0 {
|
|
pnct.u = obj_part.vt[t_index].e[0]
|
|
pnct.v = obj_part.vt[t_index].e[1]
|
|
}
|
|
|
|
out_buf.vbuf << pnct
|
|
out_buf.ibuf << u32(v_count_index)
|
|
v_count_index++
|
|
} else {
|
|
// println("Cache used! $key")
|
|
out_buf.ibuf << u32(cache[key])
|
|
cache_hit++
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
println("------------")
|
|
for c1, x1 in out_buf.vbuf[..10] {
|
|
println("$c1 $x1")
|
|
}
|
|
println(out_buf.ibuf[..10])
|
|
*/
|
|
// println("vbuf size: ${out_buf.vbuf.len} ibuf size: ${out_buf.ibuf.len} Cache hit: $cache_hit")
|
|
out_buf.n_vertex = u32(out_buf.ibuf.len)
|
|
return out_buf
|
|
}
|
|
|
|
//==============================================================================
|
|
// Utility
|
|
//==============================================================================
|
|
// print on the console the summary of the .obj model loaded
|
|
pub fn (obj_part ObjPart) summary() {
|
|
println('---- Stats ----')
|
|
println('vertices: $obj_part.v.len')
|
|
println('normals : $obj_part.vn.len')
|
|
println('uv : $obj_part.vt.len')
|
|
println('parts : $obj_part.part.len')
|
|
// Parts
|
|
println('---- Parts ----')
|
|
for c, x in obj_part.part {
|
|
println('${c:3} [${x.name:-16}] mat:[${x.material:-10}] ${x.faces.len:7} faces')
|
|
}
|
|
// Materials
|
|
println('---- Materials ----')
|
|
println('Material dict: $obj_part.mat_map.keys()')
|
|
for c, mat in obj_part.mat {
|
|
println('${c:3} [${mat.name:-16}]')
|
|
for k, v in mat.ks {
|
|
print('$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)
|
|
}
|