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examples: add .obj viewer as a sokol example (#9456)
This commit is contained in:
penguindark
587
examples/sokol/06_obj_viewer/obj/obj.v
Normal file
587
examples/sokol/06_obj_viewer/obj/obj.v
Normal file
@ -0,0 +1,587 @@
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/**********************************************************************
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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{e:[f32(f0), f32(f1), f32(f2), 1]!}
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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{e:[f32(0), 0, 0, 1]!}
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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 { res.e[c] = f32(res_f) }
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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{name:"default part"}
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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: $material")
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// manage multiple materials in an part
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if obj_part.part[obj_part.part.len - 1].material.len > 0 {
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mat_count++
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mut part := Part{}
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if mat_count > 1 {
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li := obj_part.part[obj_part.part.len - 1].name.last_index("_m") or {obj_part.part[obj_part.part.len - 1].name.len - 1}
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part.name = obj_part.part[obj_part.part.len - 1].name[..li] + "_m${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("$row_count .obj Rows parsed")
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// remove default part if empty
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if obj_part.part.len > 1 && obj_part.part[0].faces.len == 0 {
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obj_part.part = obj_part.part[1..]
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}
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}
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// load the materials if found the .mtl file
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fn (mut obj_part ObjPart) load_materials() {
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rows := obj.read_lines_from_file(obj_part.material_file)
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println("Material file [${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{name: name}
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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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||||
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||||
// if big faces => use the fan of triangles as solution
|
||||
// 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
|
||||
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)
|
||||
}
|
||||
249
examples/sokol/06_obj_viewer/obj/rend.v
Normal file
249
examples/sokol/06_obj_viewer/obj/rend.v
Normal file
@ -0,0 +1,249 @@
|
||||
/**********************************************************************
|
||||
*
|
||||
* .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 sokol.gfx
|
||||
import gg.m4
|
||||
import math
|
||||
import stbi
|
||||
|
||||
/******************************************************************************
|
||||
* Texture functions
|
||||
******************************************************************************/
|
||||
pub fn create_texture(w int, h int, buf byteptr) C.sg_image {
|
||||
sz := w * h * 4
|
||||
mut img_desc := C.sg_image_desc{
|
||||
width: w
|
||||
height: h
|
||||
num_mipmaps: 0
|
||||
min_filter: .linear
|
||||
mag_filter: .linear
|
||||
// usage: .dynamic
|
||||
wrap_u: .clamp_to_edge
|
||||
wrap_v: .clamp_to_edge
|
||||
label: &byte(0)
|
||||
d3d11_texture: 0
|
||||
}
|
||||
// comment if .dynamic is enabled
|
||||
img_desc.content.subimage[0][0] = C.sg_subimage_content{
|
||||
ptr: buf
|
||||
size: sz
|
||||
}
|
||||
|
||||
sg_img := C.sg_make_image(&img_desc)
|
||||
return sg_img
|
||||
}
|
||||
|
||||
pub fn destroy_texture(sg_img C.sg_image) {
|
||||
C.sg_destroy_image(sg_img)
|
||||
}
|
||||
|
||||
pub fn load_texture(file_name string) C.sg_image {
|
||||
buffer := obj.read_bytes_from_file(file_name)
|
||||
stbi.set_flip_vertically_on_load(true)
|
||||
img := stbi.load_from_memory(buffer.data, buffer.len) or {
|
||||
eprintln("Texure file: [$file_name] ERROR!")
|
||||
exit(0)
|
||||
}
|
||||
res := create_texture(int(img.width), int(img.height), img.data)
|
||||
img.free()
|
||||
return res
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
* Pipeline
|
||||
******************************************************************************/
|
||||
pub fn (mut obj_part ObjPart) create_pipeline(in_part []int, shader C.sg_shader, texture C.sg_image) Render_data {
|
||||
mut res := Render_data{}
|
||||
obj_buf := obj_part.get_buffer(in_part)
|
||||
res.n_vert = obj_buf.n_vertex
|
||||
res.material = obj_part.part[in_part[0]].material
|
||||
|
||||
// vertex buffer
|
||||
mut vert_buffer_desc := C.sg_buffer_desc{}
|
||||
unsafe { C.memset(&vert_buffer_desc, 0, sizeof(vert_buffer_desc)) }
|
||||
vert_buffer_desc.size = obj_buf.vbuf.len * int(sizeof(Vertex_pnct))
|
||||
vert_buffer_desc.content = byteptr(obj_buf.vbuf.data)
|
||||
vert_buffer_desc.@type = .vertexbuffer
|
||||
vert_buffer_desc.label = 'vertbuf_part_${in_part:03}'.str
|
||||
vbuf := gfx.make_buffer(&vert_buffer_desc)
|
||||
|
||||
// index buffer
|
||||
mut index_buffer_desc := C.sg_buffer_desc{}
|
||||
unsafe {C.memset(&index_buffer_desc, 0, sizeof(index_buffer_desc))}
|
||||
index_buffer_desc.size = obj_buf.ibuf.len * int(sizeof(u32))
|
||||
index_buffer_desc.content = byteptr(obj_buf.ibuf.data)
|
||||
index_buffer_desc.@type = .indexbuffer
|
||||
index_buffer_desc.label = "indbuf_part_${in_part:03}".str
|
||||
ibuf := gfx.make_buffer(&index_buffer_desc)
|
||||
|
||||
mut pipdesc := C.sg_pipeline_desc{}
|
||||
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
|
||||
pipdesc.layout.buffers[0].stride = int(sizeof(Vertex_pnct))
|
||||
|
||||
// the constants [C.ATTR_vs_a_Position, C.ATTR_vs_a_Color, C.ATTR_vs_a_Texcoord0] are generated by sokol-shdc
|
||||
pipdesc.layout.attrs[C.ATTR_vs_a_Position].format = .float3 // x,y,z as f32
|
||||
pipdesc.layout.attrs[C.ATTR_vs_a_Normal ].format = .float3 // x,y,z as f32
|
||||
pipdesc.layout.attrs[C.ATTR_vs_a_Color ].format = .ubyte4n // color as u32
|
||||
pipdesc.layout.attrs[C.ATTR_vs_a_Texcoord0 ].format = .float2 // u,v as f32
|
||||
// pipdesc.layout.attrs[C.ATTR_vs_a_Texcoord0].format = .short2n // u,v as u16
|
||||
pipdesc.index_type = .uint32
|
||||
|
||||
pipdesc.blend.enabled = true
|
||||
pipdesc.blend.src_factor_rgb = gfx.BlendFactor(C.SG_BLENDFACTOR_SRC_ALPHA)
|
||||
pipdesc.blend.dst_factor_rgb = gfx.BlendFactor(C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA)
|
||||
|
||||
pipdesc.depth_stencil = C.sg_depth_stencil_state{
|
||||
depth_write_enabled: true
|
||||
depth_compare_func: gfx.CompareFunc(C.SG_COMPAREFUNC_LESS_EQUAL)
|
||||
}
|
||||
pipdesc.rasterizer = C.sg_rasterizer_state{
|
||||
cull_mode: .front //.back
|
||||
}
|
||||
pipdesc.label = 'pip_part_${in_part:03}'.str
|
||||
|
||||
// shader
|
||||
pipdesc.shader = shader
|
||||
|
||||
res.bind.vertex_buffers[0] = vbuf
|
||||
res.bind.index_buffer = ibuf
|
||||
res.bind.fs_images[C.SLOT_tex] = texture
|
||||
res.pipeline = gfx.make_pipeline(&pipdesc)
|
||||
//println('Buffers part [$in_part] init done!')
|
||||
|
||||
return res
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
* Render functions
|
||||
******************************************************************************/
|
||||
// agregate all the part by materials
|
||||
pub fn (mut obj_part ObjPart) init_render_data(texture C.sg_image) {
|
||||
// create shader
|
||||
// One shader for all the model
|
||||
shader := gfx.make_shader(C.gouraud_shader_desc())
|
||||
//shader := gfx.make_shader(C.gouraud_shader_desc(gfx.query_backend()))
|
||||
|
||||
mut part_dict := map[string][]int{}
|
||||
for i, p in obj_part.part {
|
||||
if p.faces.len > 0 {
|
||||
part_dict[p.material] << i
|
||||
}
|
||||
}
|
||||
obj_part.rend_data.clear()
|
||||
//println("Material dict: ${obj_part.mat_map.keys()}")
|
||||
|
||||
for k, v in part_dict {
|
||||
//println("$k => Parts $v")
|
||||
|
||||
mut txt := texture
|
||||
|
||||
if k in obj_part.mat_map {
|
||||
mat_map := obj_part.mat[obj_part.mat_map[k]]
|
||||
if 'map_Kd' in mat_map.maps {
|
||||
file_name := mat_map.maps['map_Kd']
|
||||
if file_name in obj_part.texture {
|
||||
txt = obj_part.texture[file_name]
|
||||
//println("Texture [${file_name}] => from CACHE")
|
||||
} else {
|
||||
txt = obj.load_texture(file_name)
|
||||
obj_part.texture[file_name] = txt
|
||||
//println("Texture [${file_name}] => LOADED")
|
||||
}
|
||||
}
|
||||
}
|
||||
//key := obj_part.texture.keys()[0]
|
||||
//obj_part.rend_data << obj_part.create_pipeline(v, shader, obj_part.texture[key])
|
||||
obj_part.rend_data << obj_part.create_pipeline(v, shader, txt)
|
||||
}
|
||||
//println("Texture array len: ${obj_part.texture.len}")
|
||||
//println("Calc bounding box.")
|
||||
obj_part.calc_bbox()
|
||||
println("init_render_data DONE!")
|
||||
}
|
||||
|
||||
pub fn (obj_part ObjPart) bind_and_draw(rend_data_index int, in_data Shader_data) u32 {
|
||||
// apply the pipline and bindings
|
||||
mut part_render_data := obj_part.rend_data[rend_data_index]
|
||||
|
||||
// pass light position
|
||||
mut tmp_fs_params := obj.Tmp_fs_param{}
|
||||
tmp_fs_params.ligth = in_data.fs_data.ligth
|
||||
|
||||
if part_render_data.material in obj_part.mat_map {
|
||||
mat_index := obj_part.mat_map[part_render_data.material]
|
||||
mat := obj_part.mat[mat_index]
|
||||
|
||||
// ambient
|
||||
tmp_fs_params.ka = in_data.fs_data.ka
|
||||
if 'Ka' in mat.ks {
|
||||
tmp_fs_params.ka = mat.ks['Ka']
|
||||
}
|
||||
|
||||
// specular
|
||||
tmp_fs_params.ks = in_data.fs_data.ks
|
||||
if 'Ks' in mat.ks {
|
||||
tmp_fs_params.ks = mat.ks['Ks']
|
||||
}
|
||||
|
||||
// specular exponent Ns
|
||||
if 'Ns' in mat.ns {
|
||||
tmp_fs_params.ks.e[3] = mat.ns['Ns'] / 1000.0
|
||||
} else {
|
||||
// defautl value is 10
|
||||
tmp_fs_params.ks.e[3] = f32(10) / 1000.0
|
||||
}
|
||||
|
||||
// diffuse
|
||||
tmp_fs_params.kd = in_data.fs_data.kd
|
||||
if 'Kd' in mat.ks {
|
||||
tmp_fs_params.kd = mat.ks['Kd']
|
||||
}
|
||||
|
||||
// alpha/transparency
|
||||
if 'Tr' in mat.ns {
|
||||
tmp_fs_params.kd.e[3] = mat.ns['Tr']
|
||||
}
|
||||
}
|
||||
|
||||
gfx.apply_pipeline(part_render_data.pipeline)
|
||||
gfx.apply_bindings(part_render_data.bind)
|
||||
gfx.apply_uniforms(C.SG_SHADERSTAGE_VS, C.SLOT_vs_params, in_data.vs_data, in_data.vs_len)
|
||||
gfx.apply_uniforms(C.SG_SHADERSTAGE_FS, C.SLOT_fs_params, &tmp_fs_params, in_data.fs_len)
|
||||
gfx.draw(0, int(part_render_data.n_vert), 1)
|
||||
return part_render_data.n_vert
|
||||
}
|
||||
|
||||
pub fn (obj_part ObjPart) bind_and_draw_all(in_data Shader_data) u32 {
|
||||
mut n_vert := u32(0)
|
||||
//println("Parts: ${obj_part.rend_data.len}")
|
||||
for i, _ in obj_part.rend_data {
|
||||
n_vert += obj_part.bind_and_draw(i,in_data)
|
||||
}
|
||||
return n_vert
|
||||
}
|
||||
|
||||
pub fn (mut obj_part ObjPart) calc_bbox() {
|
||||
obj_part.max = m4.Vec4{e:[f32(-math.max_f32), -math.max_f32, -math.max_f32, 0]!}
|
||||
obj_part.min = m4.Vec4{e:[f32( math.max_f32), math.max_f32, math.max_f32, 0]!}
|
||||
for v in obj_part.v {
|
||||
if v.e[0] > obj_part.max.e[0] { obj_part.max.e[0] = v.e[0] }
|
||||
if v.e[1] > obj_part.max.e[1] { obj_part.max.e[1] = v.e[1] }
|
||||
if v.e[2] > obj_part.max.e[2] { obj_part.max.e[2] = v.e[2] }
|
||||
|
||||
if v.e[0] < obj_part.min.e[0] { obj_part.min.e[0] = v.e[0] }
|
||||
if v.e[1] < obj_part.min.e[1] { obj_part.min.e[1] = v.e[1] }
|
||||
if v.e[2] < obj_part.min.e[2] { obj_part.min.e[2] = v.e[2] }
|
||||
}
|
||||
val1 := obj_part.max.mod3()
|
||||
val2 := obj_part.min.mod3()
|
||||
if val1 > val2 { obj_part.radius = f32(val1) } else { obj_part.radius = f32(val2) }
|
||||
//println("BBox: ${obj_part.min} <=> ${obj_part.max}\nRadius: ${obj_part.radius}")
|
||||
}
|
||||
98
examples/sokol/06_obj_viewer/obj/struct.v
Normal file
98
examples/sokol/06_obj_viewer/obj/struct.v
Normal file
@ -0,0 +1,98 @@
|
||||
/**********************************************************************
|
||||
*
|
||||
* .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
|
||||
|
||||
// part struct mantain the fae indexes list
|
||||
pub struct Part {
|
||||
pub mut:
|
||||
faces [][][3]int // v n t index order, if -1 not available
|
||||
name string
|
||||
material string
|
||||
}
|
||||
|
||||
// materias struct, all Ks and Ns are stored as maps of string
|
||||
pub struct Material {
|
||||
pub mut:
|
||||
name string
|
||||
ks map[string]m4.Vec4
|
||||
ns map[string]f32
|
||||
maps map[string]string
|
||||
}
|
||||
|
||||
// render data used for the rendering
|
||||
pub struct Render_data{
|
||||
pub mut:
|
||||
pipeline C.sg_pipeline
|
||||
bind C.sg_bindings
|
||||
n_vert u32
|
||||
material string
|
||||
}
|
||||
|
||||
// base object parts struct
|
||||
pub struct ObjPart {
|
||||
pub mut:
|
||||
v []m4.Vec4 // position
|
||||
vn []m4.Vec4 // normals
|
||||
vp []m4.Vec4 // vertex params
|
||||
vt []m4.Vec4 // textures
|
||||
|
||||
name string
|
||||
part []Part // parts of the ObjPart
|
||||
mat []Material // list of the materials of the ObjPart
|
||||
mat_map map[string]int // maping material name to its material index
|
||||
texture map[string]C.sg_image // GPU loaded texture map
|
||||
material_file string // .mtl file name for the .obj
|
||||
|
||||
rend_data []Render_data // render data used for the rendering
|
||||
|
||||
t_m m4.Mat4 = m4.unit_m4() // transform matrix for this ObjPart
|
||||
//child []ObjPart // childs
|
||||
|
||||
// stats
|
||||
min m4.Vec4 // min 3d position in the ObjPart
|
||||
max m4.Vec4 // max 3d position in the ObjPart
|
||||
radius f32 // bounding circle radius of the ObjPart
|
||||
}
|
||||
|
||||
// used in to pass the matrices to the shader
|
||||
pub struct Mats {
|
||||
pub mut:
|
||||
mv m4.Mat4
|
||||
mvp m4.Mat4
|
||||
nm m4.Mat4
|
||||
}
|
||||
|
||||
// data passed to the vertex shader
|
||||
pub struct Tmp_vs_param {
|
||||
pub mut:
|
||||
mv m4.Mat4
|
||||
mvp m4.Mat4
|
||||
nm m4.Mat4
|
||||
}
|
||||
|
||||
// data passed to the pixel shader
|
||||
pub struct Tmp_fs_param {
|
||||
pub mut:
|
||||
ligth m4.Vec4
|
||||
ka m4.Vec4 = m4.Vec4{e:[f32(0.1), 0.0, 0.0, 1.0]!}
|
||||
kd m4.Vec4 = m4.Vec4{e:[f32(0.5), 0.5, 0.5, 1.0]!}
|
||||
ks m4.Vec4 = m4.Vec4{e:[f32(1.0), 1.0, 1.0, 1.0]!}
|
||||
}
|
||||
|
||||
// shader data for the rendering
|
||||
pub struct Shader_data {
|
||||
pub mut:
|
||||
vs_data &Tmp_vs_param
|
||||
vs_len int
|
||||
fs_data &Tmp_fs_param
|
||||
fs_len int
|
||||
}
|
||||
43
examples/sokol/06_obj_viewer/obj/util.v
Normal file
43
examples/sokol/06_obj_viewer/obj/util.v
Normal file
@ -0,0 +1,43 @@
|
||||
module obj
|
||||
import os
|
||||
|
||||
// read a file as single lines
|
||||
pub fn read_lines_from_file(file_path string) []string {
|
||||
mut path := ""
|
||||
mut rows := []string{}
|
||||
$if android {
|
||||
path = "models/"+file_path
|
||||
bts := os.read_apk_asset(path) or {
|
||||
eprintln("File [$path] NOT FOUND!")
|
||||
return rows
|
||||
}
|
||||
rows = bts.bytestr().split_into_lines()
|
||||
} $else {
|
||||
path = "assets/models/"+file_path
|
||||
rows = os.read_lines(path) or {
|
||||
eprintln("File [$path] NOT FOUND!")
|
||||
return rows
|
||||
}
|
||||
}
|
||||
return rows
|
||||
}
|
||||
|
||||
// read a file as []byte
|
||||
pub fn read_bytes_from_file(file_path string) []byte {
|
||||
mut path := ""
|
||||
mut buffer := []byte{}
|
||||
$if android {
|
||||
path = "models/"+file_path
|
||||
buffer = os.read_apk_asset(path) or {
|
||||
eprintln("Texure file: [$path] NOT FOUND!")
|
||||
exit(0)
|
||||
}
|
||||
} $else {
|
||||
path = "assets/models/"+file_path
|
||||
buffer = os.read_bytes(path) or {
|
||||
eprintln("Texure file: [$path] NOT FOUND!")
|
||||
exit(0)
|
||||
}
|
||||
}
|
||||
return buffer
|
||||
}
|
||||
Reference in New Issue
Block a user