Quake 1 (idtech2) model format (MDL version 6): Nim parsing library

import kaitai_struct_nim_runtime
import options

type
  QuakeMdl* = ref object of KaitaiStruct
    `header`*: QuakeMdl_MdlHeader
    `skins`*: seq[QuakeMdl_MdlSkin]
    `textureCoordinates`*: seq[QuakeMdl_MdlTexcoord]
    `triangles`*: seq[QuakeMdl_MdlTriangle]
    `frames`*: seq[QuakeMdl_MdlFrame]
    `parent`*: KaitaiStruct
  QuakeMdl_MdlVertex* = ref object of KaitaiStruct
    `values`*: seq[uint8]
    `normalIndex`*: uint8
    `parent`*: KaitaiStruct
  QuakeMdl_MdlTexcoord* = ref object of KaitaiStruct
    `onSeam`*: int32
    `s`*: int32
    `t`*: int32
    `parent`*: QuakeMdl
  QuakeMdl_MdlHeader* = ref object of KaitaiStruct
    `ident`*: seq[byte]
    `versionMustBe6`*: seq[byte]
    `scale`*: QuakeMdl_Vec3
    `origin`*: QuakeMdl_Vec3
    `radius`*: float32
    `eyePosition`*: QuakeMdl_Vec3
    `numSkins`*: int32
    `skinWidth`*: int32
    `skinHeight`*: int32
    `numVerts`*: int32
    `numTris`*: int32
    `numFrames`*: int32
    `synctype`*: int32
    `flags`*: int32
    `size`*: float32
    `parent`*: QuakeMdl
    `versionInst`*: int8
    `skinSizeInst`*: int
  QuakeMdl_MdlSkin* = ref object of KaitaiStruct
    `group`*: int32
    `singleTextureData`*: seq[byte]
    `numFrames`*: uint32
    `frameTimes`*: seq[float32]
    `groupTextureData`*: seq[seq[byte]]
    `parent`*: QuakeMdl
  QuakeMdl_MdlFrame* = ref object of KaitaiStruct
    `type`*: int32
    `min`*: QuakeMdl_MdlVertex
    `max`*: QuakeMdl_MdlVertex
    `time`*: seq[float32]
    `frames`*: seq[QuakeMdl_MdlSimpleFrame]
    `parent`*: QuakeMdl
    `numSimpleFramesInst`*: int32
  QuakeMdl_MdlSimpleFrame* = ref object of KaitaiStruct
    `bboxMin`*: QuakeMdl_MdlVertex
    `bboxMax`*: QuakeMdl_MdlVertex
    `name`*: string
    `vertices`*: seq[QuakeMdl_MdlVertex]
    `parent`*: QuakeMdl_MdlFrame
  QuakeMdl_MdlTriangle* = ref object of KaitaiStruct
    `facesFront`*: int32
    `vertices`*: seq[int32]
    `parent`*: QuakeMdl
  QuakeMdl_Vec3* = ref object of KaitaiStruct
    `x`*: float32
    `y`*: float32
    `z`*: float32
    `parent`*: QuakeMdl_MdlHeader

proc read*(_: typedesc[QuakeMdl], io: KaitaiStream, root: KaitaiStruct, parent: KaitaiStruct): QuakeMdl
proc read*(_: typedesc[QuakeMdl_MdlVertex], io: KaitaiStream, root: KaitaiStruct, parent: KaitaiStruct): QuakeMdl_MdlVertex
proc read*(_: typedesc[QuakeMdl_MdlTexcoord], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlTexcoord
proc read*(_: typedesc[QuakeMdl_MdlHeader], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlHeader
proc read*(_: typedesc[QuakeMdl_MdlSkin], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlSkin
proc read*(_: typedesc[QuakeMdl_MdlFrame], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlFrame
proc read*(_: typedesc[QuakeMdl_MdlSimpleFrame], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl_MdlFrame): QuakeMdl_MdlSimpleFrame
proc read*(_: typedesc[QuakeMdl_MdlTriangle], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlTriangle
proc read*(_: typedesc[QuakeMdl_Vec3], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl_MdlHeader): QuakeMdl_Vec3

proc version*(this: QuakeMdl_MdlHeader): int8
proc skinSize*(this: QuakeMdl_MdlHeader): int
proc numSimpleFrames*(this: QuakeMdl_MdlFrame): int32

proc read*(_: typedesc[QuakeMdl], io: KaitaiStream, root: KaitaiStruct, parent: KaitaiStruct): QuakeMdl =
  template this: untyped = result
  this = new(QuakeMdl)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let headerExpr = QuakeMdl_MdlHeader.read(this.io, this.root, this)
  this.header = headerExpr
  for i in 0 ..< int(this.header.numSkins):
    let it = QuakeMdl_MdlSkin.read(this.io, this.root, this)
    this.skins.add(it)
  for i in 0 ..< int(this.header.numVerts):
    let it = QuakeMdl_MdlTexcoord.read(this.io, this.root, this)
    this.textureCoordinates.add(it)
  for i in 0 ..< int(this.header.numTris):
    let it = QuakeMdl_MdlTriangle.read(this.io, this.root, this)
    this.triangles.add(it)
  for i in 0 ..< int(this.header.numFrames):
    let it = QuakeMdl_MdlFrame.read(this.io, this.root, this)
    this.frames.add(it)

proc fromFile*(_: typedesc[QuakeMdl], filename: string): QuakeMdl =
  QuakeMdl.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlVertex], io: KaitaiStream, root: KaitaiStruct, parent: KaitaiStruct): QuakeMdl_MdlVertex =
  template this: untyped = result
  this = new(QuakeMdl_MdlVertex)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  for i in 0 ..< int(3):
    let it = this.io.readU1()
    this.values.add(it)
  let normalIndexExpr = this.io.readU1()
  this.normalIndex = normalIndexExpr

proc fromFile*(_: typedesc[QuakeMdl_MdlVertex], filename: string): QuakeMdl_MdlVertex =
  QuakeMdl_MdlVertex.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlTexcoord], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlTexcoord =
  template this: untyped = result
  this = new(QuakeMdl_MdlTexcoord)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let onSeamExpr = this.io.readS4le()
  this.onSeam = onSeamExpr
  let sExpr = this.io.readS4le()
  this.s = sExpr
  let tExpr = this.io.readS4le()
  this.t = tExpr

proc fromFile*(_: typedesc[QuakeMdl_MdlTexcoord], filename: string): QuakeMdl_MdlTexcoord =
  QuakeMdl_MdlTexcoord.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlHeader], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlHeader =
  template this: untyped = result
  this = new(QuakeMdl_MdlHeader)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let identExpr = this.io.readBytes(int(4))
  this.ident = identExpr
  let versionMustBe6Expr = this.io.readBytes(int(4))
  this.versionMustBe6 = versionMustBe6Expr
  let scaleExpr = QuakeMdl_Vec3.read(this.io, this.root, this)
  this.scale = scaleExpr
  let originExpr = QuakeMdl_Vec3.read(this.io, this.root, this)
  this.origin = originExpr
  let radiusExpr = this.io.readF4le()
  this.radius = radiusExpr
  let eyePositionExpr = QuakeMdl_Vec3.read(this.io, this.root, this)
  this.eyePosition = eyePositionExpr
  let numSkinsExpr = this.io.readS4le()
  this.numSkins = numSkinsExpr
  let skinWidthExpr = this.io.readS4le()
  this.skinWidth = skinWidthExpr
  let skinHeightExpr = this.io.readS4le()
  this.skinHeight = skinHeightExpr
  let numVertsExpr = this.io.readS4le()
  this.numVerts = numVertsExpr
  let numTrisExpr = this.io.readS4le()
  this.numTris = numTrisExpr
  let numFramesExpr = this.io.readS4le()
  this.numFrames = numFramesExpr
  let synctypeExpr = this.io.readS4le()
  this.synctype = synctypeExpr
  let flagsExpr = this.io.readS4le()
  this.flags = flagsExpr
  let sizeExpr = this.io.readF4le()
  this.size = sizeExpr

proc version(this: QuakeMdl_MdlHeader): int8 = 
  if this.versionInst != nil:
    return this.versionInst
  let versionInstExpr = int8(6)
  this.versionInst = versionInstExpr
  if this.versionInst != nil:
    return this.versionInst

proc skinSize(this: QuakeMdl_MdlHeader): int = 
  if this.skinSizeInst != nil:
    return this.skinSizeInst
  let skinSizeInstExpr = int((this.skinWidth * this.skinHeight))
  this.skinSizeInst = skinSizeInstExpr
  if this.skinSizeInst != nil:
    return this.skinSizeInst

proc fromFile*(_: typedesc[QuakeMdl_MdlHeader], filename: string): QuakeMdl_MdlHeader =
  QuakeMdl_MdlHeader.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlSkin], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlSkin =
  template this: untyped = result
  this = new(QuakeMdl_MdlSkin)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let groupExpr = this.io.readS4le()
  this.group = groupExpr
  if this.group == 0:
    let singleTextureDataExpr = this.io.readBytes(int(QuakeMdl(this.root).header.skinSize))
    this.singleTextureData = singleTextureDataExpr
  if this.group != 0:
    let numFramesExpr = this.io.readU4le()
    this.numFrames = numFramesExpr
  if this.group != 0:
    for i in 0 ..< int(this.numFrames):
      let it = this.io.readF4le()
      this.frameTimes.add(it)
  if this.group != 0:
    for i in 0 ..< int(this.numFrames):
      let it = this.io.readBytes(int(QuakeMdl(this.root).header.skinSize))
      this.groupTextureData.add(it)

proc fromFile*(_: typedesc[QuakeMdl_MdlSkin], filename: string): QuakeMdl_MdlSkin =
  QuakeMdl_MdlSkin.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlFrame], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlFrame =
  template this: untyped = result
  this = new(QuakeMdl_MdlFrame)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let typeExpr = this.io.readS4le()
  this.type = typeExpr
  if this.type != 0:
    let minExpr = QuakeMdl_MdlVertex.read(this.io, this.root, this)
    this.min = minExpr
  if this.type != 0:
    let maxExpr = QuakeMdl_MdlVertex.read(this.io, this.root, this)
    this.max = maxExpr
  if this.type != 0:
    for i in 0 ..< int(this.type):
      let it = this.io.readF4le()
      this.time.add(it)
  for i in 0 ..< int(this.numSimpleFrames):
    let it = QuakeMdl_MdlSimpleFrame.read(this.io, this.root, this)
    this.frames.add(it)

proc numSimpleFrames(this: QuakeMdl_MdlFrame): int32 = 
  if this.numSimpleFramesInst != nil:
    return this.numSimpleFramesInst
  let numSimpleFramesInstExpr = int32((if this.type == 0: 1 else: this.type))
  this.numSimpleFramesInst = numSimpleFramesInstExpr
  if this.numSimpleFramesInst != nil:
    return this.numSimpleFramesInst

proc fromFile*(_: typedesc[QuakeMdl_MdlFrame], filename: string): QuakeMdl_MdlFrame =
  QuakeMdl_MdlFrame.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlSimpleFrame], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl_MdlFrame): QuakeMdl_MdlSimpleFrame =
  template this: untyped = result
  this = new(QuakeMdl_MdlSimpleFrame)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let bboxMinExpr = QuakeMdl_MdlVertex.read(this.io, this.root, this)
  this.bboxMin = bboxMinExpr
  let bboxMaxExpr = QuakeMdl_MdlVertex.read(this.io, this.root, this)
  this.bboxMax = bboxMaxExpr
  let nameExpr = encode(this.io.readBytes(int(16)).bytesStripRight(0).bytesTerminate(0, false), "ASCII")
  this.name = nameExpr
  for i in 0 ..< int(QuakeMdl(this.root).header.numVerts):
    let it = QuakeMdl_MdlVertex.read(this.io, this.root, this)
    this.vertices.add(it)

proc fromFile*(_: typedesc[QuakeMdl_MdlSimpleFrame], filename: string): QuakeMdl_MdlSimpleFrame =
  QuakeMdl_MdlSimpleFrame.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_MdlTriangle], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl): QuakeMdl_MdlTriangle =
  template this: untyped = result
  this = new(QuakeMdl_MdlTriangle)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let facesFrontExpr = this.io.readS4le()
  this.facesFront = facesFrontExpr
  for i in 0 ..< int(3):
    let it = this.io.readS4le()
    this.vertices.add(it)

proc fromFile*(_: typedesc[QuakeMdl_MdlTriangle], filename: string): QuakeMdl_MdlTriangle =
  QuakeMdl_MdlTriangle.read(newKaitaiFileStream(filename), nil, nil)

proc read*(_: typedesc[QuakeMdl_Vec3], io: KaitaiStream, root: KaitaiStruct, parent: QuakeMdl_MdlHeader): QuakeMdl_Vec3 =
  template this: untyped = result
  this = new(QuakeMdl_Vec3)
  let root = if root == nil: cast[QuakeMdl](this) else: cast[QuakeMdl](root)
  this.io = io
  this.root = root
  this.parent = parent

  let xExpr = this.io.readF4le()
  this.x = xExpr
  let yExpr = this.io.readF4le()
  this.y = yExpr
  let zExpr = this.io.readF4le()
  this.z = zExpr

proc fromFile*(_: typedesc[QuakeMdl_Vec3], filename: string): QuakeMdl_Vec3 =
  QuakeMdl_Vec3.read(newKaitaiFileStream(filename), nil, nil)