bones

.gitignore

@@ -1,2 +1,3 @@
 /target
 Cargo.lock
+data

Cargo.toml

@@ -2,7 +2,11 @@
 name = "vmdl"
 version = "0.1.0"
 edition = "2021"
-
+exclude = ["data"]
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+arrayvec = "0.7.2"
+binrw = "0.8.0"
+thiserror = "1.0.30"
+static_assertions = "1.1.0"
+bitflags = "1.0.4"

examples/parse.rs

@@ -0,0 +1,10 @@
+fn main() -> Result<(), vmdl::MdlError> {
+    let mut args = std::env::args();
+    let _ = args.next();
+    let data = std::fs::read(args.next().expect("No demo file provided"))?;
+    let mdl = vmdl::Mdl::read(&data)?;
+
+    dbg!(mdl.bones);
+
+    Ok(())
+}

src/data/bone.rs

@@ -0,0 +1,58 @@
+use crate::{Quaternion, RadianEuler, Vector};
+use binrw::BinRead;
+use bitflags::bitflags;
+
+#[derive(Debug, Clone, BinRead)]
+pub struct Bone {
+    pub sz_name_index: i32,
+    pub parent: i32,               // parent bone
+    pub bone_controller: [i32; 6], // bone controller index, -1 == none
+
+    pub pos: Vector,
+    pub quaternion: Quaternion,
+    pub rot: RadianEuler,
+    pub pos_scale: Vector,
+    pub rot_scale: Vector,
+
+    pub pose_to_bone: [[f32; 3]; 4], // 3x4 matrix
+    pub q_alignment: Quaternion,
+    pub flags: BoneFlags,
+    pub proc_type: i32,
+    pub proc_index: i32,       // procedural rule
+    pub physics_bone: i32,     // index into physically simulated bone
+    pub surface_prop_idx: i32, // index into string table for property name
+    pub contents: i32,         // See BSPFlags.h for the contents flags
+
+    #[allow(dead_code)]
+    reserved: [i32; 8], // remove as appropriate
+}
+
+bitflags! {
+    #[derive(BinRead)]
+    pub struct BoneFlags: u32 {
+        const BONE_PHYSICALLY_SIMULATED = 	0x00000001;
+        const BONE_PHYSICS_PROCEDURAL = 	0x00000002;
+        const BONE_ALWAYS_PROCEDURAL = 		0x00000004;
+        const BONE_SCREEN_ALIGN_SPHERE = 	0x00000008;
+        const BONE_SCREEN_ALIGN_CYLINDER = 	0x00000010;
+
+        const BONE_USED_BY_HITBOX =			0x00000100;
+        const BONE_USED_BY_ATTACHMENT =		0x00000200;
+
+        const BONE_USED_BY_VERTEX_LOD0 =	0x00000400;
+        const BONE_USED_BY_VERTEX_LOD1 =	0x00000800;
+        const BONE_USED_BY_VERTEX_LOD2 =	0x00001000;
+        const BONE_USED_BY_VERTEX_LOD3 =	0x00002000;
+        const BONE_USED_BY_VERTEX_LOD4 =	0x00004000;
+        const BONE_USED_BY_VERTEX_LOD5 =	0x00008000;
+        const BONE_USED_BY_VERTEX_LOD6 =	0x00010000;
+        const BONE_USED_BY_VERTEX_LOD7 =	0x00020000;
+        const BONE_USED_BY_BONE_MERGE =		0x00040000;
+
+        const BONE_TYPE_MASK =				0x00F00000;
+        const BONE_FIXED_ALIGNMENT =		0x00100000;
+
+        const BONE_HAS_SAVEFRAME_POS =		0x00200000;
+        const BONE_HAS_SAVEFRAME_ROT =		0x00400000;
+    }
+}

src/data/header.rs

@@ -0,0 +1,295 @@
+use crate::{Bone, FixedString, Vector};
+use binrw::BinRead;
+use std::mem::size_of;
+
+pub const FILETYPE_ID: i32 = i32::from_be_bytes(*b"IDST");
+pub const MDL_VERSION: i32 = 48;
+
+#[derive(Debug, Clone, BinRead)]
+pub struct StudioHeader {
+    pub id: i32,
+    pub version: i32,
+    pub checksum: [u8; 4], // This has to be the same in the phy and vtx files to load!
+    pub name: FixedString<64>,
+    pub data_length: i32,
+
+    pub eye_position: Vector, // Position of player viewpoint relative to model origin
+    pub illumination_position: Vector, // Position (relative to model origin) used to calculate ambient light contribution and cubemap reflections for the entire model.
+    pub hull_min: Vector,              // Corner of model hull box with the least X/Y/Z values
+    pub hull_max: Vector,              // Opposite corner of model hull box
+    pub view_bb_min: Vector,
+    pub view_bb_max: Vector,
+
+    pub flags: i32, // Binary flags in little-endian order.
+    // ex (00000001,00000000,00000000,11000000) means flags for position 0, 30, and 31 are set.
+    // Set model flags section for more information
+
+    /*
+     * After this point, the header contains many references to offsets
+     * within the MDL file and the number of items at those offsets.
+     *
+     * Offsets are from the very beginning of the file.
+     *
+     * Note that indexes/counts are not always paired and ordered consistently.
+     */
+    // mstudiobone_t
+    bone_count: i32,  // Number of data sections (of type mstudiobone_t)
+    bone_offset: i32, // Offset of first data section
+
+    // mstudiobonecontroller_t
+    bone_controller_count: i32,
+    bone_controller_offset: i32,
+
+    // mstudiohitboxset_t
+    hitbox_count: i32,
+    hitbox_offset: i32,
+
+    // mstudioanimdesc_t
+    local_animation_count: i32,
+    local_animation_offset: i32,
+
+    // mstudioseqdesc_t
+    local_seq_count: i32,
+    local_seq_offset: i32,
+
+    pub activity_list_version: i32, // ??
+    pub events_indexed: i32,        // ??
+
+    // VMT texture filenames
+    // mstudiotexture_t
+    texture_count: i32,
+    texture_offset: i32,
+
+    // This offset points to a series of ints.
+    // Each int value, in turn, is an offset relative to the start of this header/the-file,
+    // At which there is a null-terminated string.
+    texture_dir_count: i32,
+    texture_dir_offset: i32,
+
+    // Each skin-family assigns a texture-id to a skin location
+    pub skin_reference_count: i32,
+    pub skin_r_family_count: i32,
+    pub skin_reference_index: i32,
+
+    // mstudiobodyparts_t
+    body_part_count: i32,
+    body_part_offset: i32,
+
+    // Local attachment points
+    // mstudioattachment_t
+    attachment_count: i32,
+    attachment_offset: i32,
+
+    // Node values appear to be single bytes, while their names are null-terminated strings.
+    local_node_count: i32,
+    local_node_index: i32,
+    local_node_name_index: i32,
+
+    // mstudioflexdesc_t
+    flex_desc_count: i32,
+    flex_desc_index: i32,
+
+    // mstudioflexcontroller_t
+    flex_controller_count: i32,
+    flex_controller_index: i32,
+
+    // mstudioflexrule_t
+    flex_rules_count: i32,
+    flex_rules_index: i32,
+
+    // IK probably referse to inverse kinematics
+    // mstudioikchain_t
+    ik_chain_count: i32,
+    ik_chain_index: i32,
+
+    // Information about any "mouth" on the model for speech animation
+    // More than one sounds pretty creepy.
+    // mstudiomouth_t
+    mouths_count: i32,
+    mouths_index: i32,
+
+    // mstudioposeparamdesc_t
+    local_pose_param_count: i32,
+    local_pose_param_index: i32,
+
+    /*
+     * For anyone trying to follow along, as of this writing,
+     * the next "surfaceprop_index" value is at position 0x0134 (308)
+     * from the start of the file.
+     */
+    // Surface property value (single null-terminated string)
+    pub surface_prop_index: i32,
+
+    // Unusual: In this one index comes first, then count.
+    // Key-value data is a series of strings. If you can't find
+    // what you're interested in, check the associated PHY file as well.
+    key_value_index: i32,
+    key_value_count: i32,
+
+    // More inverse-kinematics
+    // mstudioiklock_t
+    ik_lock_count: i32,
+    ik_lock_index: i32,
+
+    pub mass: f32,     // Mass of object (4-bytes)
+    pub contents: i32, // ??
+
+    // Other models can be referenced for re-used sequences and animations
+    // (See also: The $includemodel QC option.)
+    // mstudiomodelgroup_t
+    include_model_count: i32,
+    include_model_index: i32,
+
+    pub virtual_model: i32, // Placeholder for mutable-void*
+    // Note that the SDK only compiles as 32-bit, so an int and a pointer are the same size (4 bytes)
+
+    // mstudioanimblock_t
+    anim_blocks_name_index: i32,
+    anim_blocks_count: i32,
+    anim_blocks_index: i32,
+
+    pub anim_block_model: i32, // Placeholder for mutable-void*
+
+    // Points to a series of bytes?
+    pub bone_table_name_index: i32,
+
+    pub vertex_base: i32, // Placeholder for void*
+    pub offset_base: i32, // Placeholder for void*
+
+    // Used with $constantdirectionallight from the QC
+    // Model should have flag #13 set if enabled
+    pub directional_dot_product: u8,
+
+    pub root_lod: u8, // Preferred rather than clamped
+
+    // 0 means any allowed, N means Lod 0 -> (N-1)
+    pub num_allowed_root_lods: u8,
+
+    #[allow(dead_code)]
+    unused0: u8, // ??
+    #[allow(dead_code)]
+    unused1: i32, // ??
+
+    pub flex_controller_ui_count: i32,
+    pub flex_controller_ui_index: i32,
+
+    pub vert_anim_fixed_point_scale: f32,
+    pub unused2: i32,
+
+    pub studio_hdr2_index: i32,
+
+    #[allow(dead_code)]
+    unused3: i32,
+}
+
+impl StudioHeader {
+    pub fn header2_index(&self) -> Option<usize> {
+        (self.studio_hdr2_index > 0)
+            .then(|| self.studio_hdr2_index)
+            .and_then(|index| usize::try_from(index).ok())
+    }
+
+    pub fn bone_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.bone_offset, self.bone_count, size_of::<Bone>())
+    }
+
+    pub fn bone_controller_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.bone_controller_offset, self.bone_controller_count, 1)
+    }
+
+    pub fn hitbox_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.hitbox_offset, self.hitbox_count, 1)
+    }
+
+    pub fn local_animation_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.local_animation_offset, self.local_animation_count, 1)
+    }
+
+    pub fn local_sequence_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.local_seq_offset, self.local_seq_count, 1)
+    }
+
+    pub fn texture_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.texture_offset, self.texture_count, 1)
+    }
+
+    pub fn texture_dir_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.texture_dir_offset, self.texture_dir_count, 1)
+    }
+
+    pub fn body_part_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.body_part_offset, self.body_part_count, 1)
+    }
+
+    pub fn attachment_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.attachment_offset, self.attachment_count, 1)
+    }
+
+    pub fn local_node_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.local_node_index, self.local_node_count, 1)
+    }
+
+    pub fn local_node_name_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.local_node_name_index, self.local_node_count, 1)
+    }
+
+    pub fn flex_descriptor_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.flex_desc_index, self.flex_desc_count, 1)
+    }
+
+    pub fn flex_controller_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.flex_controller_index, self.flex_controller_count, 1)
+    }
+
+    pub fn flex_rule_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.flex_rules_index, self.flex_rules_count, 1)
+    }
+
+    pub fn ik_chain_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.ik_chain_index, self.ik_chain_count, 1)
+    }
+
+    pub fn mouth_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.mouths_index, self.mouths_count, 1)
+    }
+
+    pub fn local_pose_param_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.local_pose_param_index, self.local_pose_param_count, 1)
+    }
+
+    pub fn key_value_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.key_value_index, self.key_value_count, 1)
+    }
+
+    pub fn ik_lock_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.ik_lock_index, self.ik_lock_count, 1)
+    }
+
+    pub fn include_model_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.include_model_index, self.include_model_count, 1)
+    }
+
+    pub fn animation_block_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.anim_blocks_index, self.anim_blocks_count, 1)
+    }
+
+    pub fn animation_block_name_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(self.anim_blocks_name_index, self.anim_blocks_count, 1)
+    }
+
+    pub fn flex_controller_ui_indexes(&self) -> impl Iterator<Item = usize> {
+        index_range(
+            self.flex_controller_ui_index,
+            self.flex_controller_ui_count,
+            1,
+        )
+    }
+}
+
+fn index_range(index: i32, count: i32, size: usize) -> impl Iterator<Item = usize> {
+    (0..count as usize)
+        .map(move |i| i * size)
+        .map(move |i| index as usize + i)
+}
+
+static_assertions::const_assert_eq!(size_of::<StudioHeader>() - size_of::<FixedString<0>>(), 408);

src/data/header2.rs

@@ -0,0 +1,39 @@
+use std::ops::Range;
+
+pub struct StudioHHeader2 {
+    source_bone_transform_count: i32,
+    source_bone_transform_index: i32,
+
+    pub illumination_position_attachment_index: i32,
+
+    fl_max_exe_deflection: f32,
+
+    pub linear_bone_index: i32,
+
+    pub sz_name_index: i32,
+
+    bone_flex_driver_count: i32,
+    bone_flex_driver_index: i32,
+
+    #[allow(dead_code)]
+    reserved: [i32; 56],
+}
+
+impl StudioHHeader2 {
+    pub fn source_bone_transforms(&self) -> Range<i32> {
+        self.source_bone_transform_index
+            ..(self.source_bone_transform_index + self.source_bone_transform_count)
+    }
+
+    pub fn bone_flex_drivers(&self) -> Range<i32> {
+        self.bone_flex_driver_index..(self.bone_flex_driver_index + self.bone_flex_driver_count)
+    }
+
+    pub fn max_eye_deflection(&self) -> f32 {
+        if self.fl_max_exe_deflection == 0.0 {
+            (30.0f32).cos()
+        } else {
+            self.fl_max_exe_deflection
+        }
+    }
+}

src/data/mod.rs

@@ -0,0 +1,114 @@
+mod bone;
+mod header;
+mod header2;
+
+pub use bone::*;
+pub use header::*;
+pub use header2::*;
+
+use crate::error::StringError;
+use arrayvec::ArrayString;
+use binrw::{BinRead, BinResult, ReadOptions};
+use std::fmt;
+use std::fmt::{Display, Formatter};
+
+#[derive(Debug, Clone, Copy, BinRead)]
+pub struct Vector {
+    pub x: f32,
+    pub y: f32,
+    pub z: f32,
+}
+
+impl From<Vector> for [f32; 3] {
+    fn from(vector: Vector) -> Self {
+        [vector.x, vector.y, vector.z]
+    }
+}
+
+impl From<[f32; 3]> for Vector {
+    fn from(vector: [f32; 3]) -> Self {
+        Vector {
+            x: vector[0],
+            y: vector[1],
+            z: vector[2],
+        }
+    }
+}
+
+impl From<&Vector> for [f32; 3] {
+    fn from(vector: &Vector) -> Self {
+        [vector.x, vector.y, vector.z]
+    }
+}
+
+#[derive(Debug, Clone, BinRead)]
+pub struct Quaternion {
+    pub x: f32,
+    pub y: f32,
+    pub z: f32,
+    pub w: f32,
+}
+
+#[derive(Debug, Clone, BinRead)]
+pub struct RadianEuler {
+    pub x: f32,
+    pub y: f32,
+    pub z: f32,
+}
+
+/// Fixed length, null-terminated string
+#[derive(Debug, Clone)]
+pub struct FixedString<const LEN: usize>(ArrayString<LEN>);
+
+impl<const N: usize> AsRef<str> for FixedString<N> {
+    fn as_ref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl<const N: usize> FixedString<N> {
+    pub fn as_str(&self) -> &str {
+        self.0.as_str()
+    }
+}
+
+impl<const LEN: usize> Display for FixedString<LEN> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        Display::fmt(&self.0, f)
+    }
+}
+
+impl<const LEN: usize> BinRead for FixedString<LEN> {
+    type Args = ();
+
+    fn read_options<R: binrw::io::Read + binrw::io::Seek>(
+        reader: &mut R,
+        options: &ReadOptions,
+        args: Self::Args,
+    ) -> BinResult<Self> {
+        use std::str;
+
+        let name_buf = <[u8; LEN]>::read_options(reader, options, args)?;
+
+        let zero_pos =
+            name_buf
+                .iter()
+                .position(|c| *c == 0)
+                .ok_or_else(|| binrw::Error::Custom {
+                    pos: reader.stream_position().unwrap(),
+                    err: Box::new(StringError::NotNullTerminated),
+                })?;
+        let name = &name_buf[..zero_pos];
+        Ok(FixedString(
+            ArrayString::from(
+                str::from_utf8(name)
+                    .map_err(StringError::NonUTF8)
+                    .map_err(|e| binrw::Error::Custom {
+                        pos: reader.stream_position().unwrap(),
+                        err: Box::new(e),
+                    })?,
+            )
+            .unwrap(),
+        ))
+    }
+}

src/error.rs

@@ -0,0 +1,41 @@
+use thiserror::Error;
+
+#[non_exhaustive]
+#[derive(Debug, Error)]
+pub enum MdlError {
+    #[error("io error while reading data: {0}")]
+    IO(#[from] std::io::Error),
+    #[error(transparent)]
+    String(#[from] StringError),
+    #[error("Malformed field found while parsing: {0:#}")]
+    MalformedData(binrw::Error),
+    #[error("referenced data is out of bounds")]
+    OutOfBounds,
+}
+
+impl From<binrw::Error> for MdlError {
+    fn from(e: binrw::Error) -> Self {
+        use binrw::Error;
+
+        // only a few error types should be generated by our code
+        match e {
+            Error::Io(e) => MdlError::IO(e),
+            Error::Custom { err, .. } => {
+                if err.is::<StringError>() {
+                    MdlError::String(*err.downcast::<StringError>().unwrap())
+                } else {
+                    panic!("unexpected custom error")
+                }
+            }
+            e => MdlError::MalformedData(e),
+        }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum StringError {
+    #[error(transparent)]
+    NonUTF8(#[from] std::str::Utf8Error),
+    #[error("String is not null-terminated")]
+    NotNullTerminated,
+}

src/handle/mod.rs

@@ -0,0 +1,32 @@
+use crate::Mdl;
+use std::ops::Deref;
+
+/// A handle represents a data structure in the mdl file and the mdl file containing it.
+///
+/// Keeping a reference of the mdl file with the data is required since a lot of data types
+/// reference parts from other structures in the mdl file
+#[derive(Debug)]
+pub struct Handle<'a, T> {
+    mdl: &'a Mdl,
+    data: &'a T,
+}
+
+impl<T> Clone for Handle<'_, T> {
+    fn clone(&self) -> Self {
+        Handle { ..*self }
+    }
+}
+
+impl<'a, T> AsRef<T> for Handle<'a, T> {
+    fn as_ref(&self) -> &'a T {
+        self.data
+    }
+}
+
+impl<T> Deref for Handle<'_, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        self.data
+    }
+}

src/lib.rs

@@ -1,8 +1,41 @@
-#[cfg(test)]
+mod data;
-mod tests {
+mod error;
-    #[test]
+mod handle;
-    fn it_works() {
+
-        let result = 2 + 2;
+use binrw::{BinRead, BinReaderExt};
-        assert_eq!(result, 4);
+pub use data::*;
+pub use error::*;
+pub use handle::Handle;
+use std::io::Cursor;
+
+#[derive(Debug, Clone)]
+pub struct Mdl {
+    pub header: StudioHeader,
+    pub bones: Vec<Bone>,
+}
+
+impl Mdl {
+    pub fn read(data: &[u8]) -> Result<Self, MdlError> {
+        let mut reader = Cursor::new(data);
+        let header: StudioHeader = reader.read_le()?;
+        let bones = read_indexes(header.bone_indexes(), data).collect::<Result<_, _>>()?;
+        Ok(Mdl { header, bones })
     }
 }
+
+fn read_indexes<'a, I: Iterator<Item = usize> + 'static, T: BinRead>(
+    indexes: I,
+    data: &'a [u8],
+) -> impl Iterator<Item = Result<T, MdlError>> + 'a
+where
+    T::Args: Default,
+{
+    indexes
+        .map(|index| data.get(index..).ok_or(MdlError::OutOfBounds))
+        .map(|data| {
+            data.and_then(|data| {
+                let mut cursor = Cursor::new(data);
+                cursor.read_le().map_err(MdlError::from)
+            })
+        })
+}