Refactor documentation structure and add new specifications

- Updated MSH documentation to reflect changes in material, wear, and texture specifications.
- Introduced new `render.md` file detailing the render pipeline process.
- Removed outdated sections from `runtime-pipeline.md` and redirected to `render.md`.
- Added detailed specifications for `Texm` texture format and `WEAR` wear table.
- Updated navigation in `mkdocs.yml` to align with new documentation structure.

19 files changed, 2005 insertions, 0 deletions

diff --git a/crates/msh-core/Cargo.toml b/crates/msh-core/Cargo.toml
new file mode 100644
index 0000000..cdea317
--- /dev/null
+++ b/crates/msh-core/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "msh-core"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+nres = { path = "../nres" }
diff --git a/crates/msh-core/README.md b/crates/msh-core/README.md
new file mode 100644
index 0000000..016df7a
--- /dev/null
+++ b/crates/msh-core/README.md
@@ -0,0 +1,14 @@
+# msh-core
+
+Парсер core-части формата `MSH`.
+
+Покрывает:
+
+- `Res1`, `Res2`, `Res3`, `Res6`, `Res13` (обязательные);
+- `Res4`, `Res5`, `Res10` (опциональные);
+- slot lookup по `node/lod/group`.
+
+Тесты:
+
+- прогон по всем `.msh` в `testdata`;
+- синтетическая минимальная модель.
diff --git a/crates/msh-core/src/error.rs b/crates/msh-core/src/error.rs
new file mode 100644
index 0000000..81fe54f
--- /dev/null
+++ b/crates/msh-core/src/error.rs
@@ -0,0 +1,74 @@
+use core::fmt;
+
+#[derive(Debug)]
+pub enum Error {
+    Nres(nres::error::Error),
+    MissingResource {
+        kind: u32,
+        label: &'static str,
+    },
+    InvalidResourceSize {
+        label: &'static str,
+        size: usize,
+        stride: usize,
+    },
+    InvalidRes2Size {
+        size: usize,
+    },
+    UnsupportedNodeStride {
+        stride: usize,
+    },
+    IndexOutOfBounds {
+        label: &'static str,
+        index: usize,
+        limit: usize,
+    },
+    IntegerOverflow,
+}
+
+impl From<nres::error::Error> for Error {
+    fn from(value: nres::error::Error) -> Self {
+        Self::Nres(value)
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Nres(err) => write!(f, "{err}"),
+            Self::MissingResource { kind, label } => {
+                write!(f, "missing required resource type={kind} ({label})")
+            }
+            Self::InvalidResourceSize {
+                label,
+                size,
+                stride,
+            } => {
+                write!(
+                    f,
+                    "invalid {label} size={size}, expected multiple of stride={stride}"
+                )
+            }
+            Self::InvalidRes2Size { size } => {
+                write!(f, "invalid Res2 size={size}, expected >= 140")
+            }
+            Self::UnsupportedNodeStride { stride } => {
+                write!(
+                    f,
+                    "unsupported Res1 node stride={stride}, expected 38 or 24"
+                )
+            }
+            Self::IndexOutOfBounds {
+                label,
+                index,
+                limit,
+            } => write!(
+                f,
+                "{label} index out of bounds: index={index}, limit={limit}"
+            ),
+            Self::IntegerOverflow => write!(f, "integer overflow"),
+        }
+    }
+}
+
+impl std::error::Error for Error {}
diff --git a/crates/msh-core/src/lib.rs b/crates/msh-core/src/lib.rs
new file mode 100644
index 0000000..84e8a86
--- /dev/null
+++ b/crates/msh-core/src/lib.rs
@@ -0,0 +1,392 @@
+pub mod error;
+
+use crate::error::Error;
+use std::sync::Arc;
+
+pub type Result<T> = core::result::Result<T, Error>;
+
+pub const RES1_NODE_TABLE: u32 = 1;
+pub const RES2_SLOTS: u32 = 2;
+pub const RES3_POSITIONS: u32 = 3;
+pub const RES4_NORMALS: u32 = 4;
+pub const RES5_UV0: u32 = 5;
+pub const RES6_INDICES: u32 = 6;
+pub const RES10_NAMES: u32 = 10;
+pub const RES13_BATCHES: u32 = 13;
+
+#[derive(Clone, Debug)]
+pub struct Slot {
+    pub tri_start: u16,
+    pub tri_count: u16,
+    pub batch_start: u16,
+    pub batch_count: u16,
+    pub aabb_min: [f32; 3],
+    pub aabb_max: [f32; 3],
+    pub sphere_center: [f32; 3],
+    pub sphere_radius: f32,
+    pub opaque: [u32; 5],
+}
+
+#[derive(Clone, Debug)]
+pub struct Batch {
+    pub batch_flags: u16,
+    pub material_index: u16,
+    pub opaque4: u16,
+    pub opaque6: u16,
+    pub index_count: u16,
+    pub index_start: u32,
+    pub opaque14: u16,
+    pub base_vertex: u32,
+}
+
+#[derive(Clone, Debug)]
+pub struct Model {
+    pub node_stride: usize,
+    pub node_count: usize,
+    pub nodes_raw: Vec<u8>,
+    pub slots: Vec<Slot>,
+    pub positions: Vec<[f32; 3]>,
+    pub normals: Option<Vec<[i8; 4]>>,
+    pub uv0: Option<Vec<[i16; 2]>>,
+    pub indices: Vec<u16>,
+    pub batches: Vec<Batch>,
+    pub node_names: Option<Vec<Option<String>>>,
+}
+
+impl Model {
+    pub fn slot_index(&self, node_index: usize, lod: usize, group: usize) -> Option<usize> {
+        if node_index >= self.node_count || lod >= 3 || group >= 5 {
+            return None;
+        }
+        if self.node_stride != 38 {
+            return None;
+        }
+        let node_off = node_index.checked_mul(self.node_stride)?;
+        let matrix_off = node_off.checked_add(8)?;
+        let word_off = matrix_off.checked_add((lod * 5 + group) * 2)?;
+        let raw = read_u16(&self.nodes_raw, word_off).ok()?;
+        if raw == u16::MAX {
+            return None;
+        }
+        let idx = usize::from(raw);
+        if idx >= self.slots.len() {
+            return None;
+        }
+        Some(idx)
+    }
+}
+
+pub fn parse_model_payload(payload: &[u8]) -> Result<Model> {
+    let archive = nres::Archive::open_bytes(
+        Arc::from(payload.to_vec().into_boxed_slice()),
+        nres::OpenOptions::default(),
+    )?;
+
+    let res1 = read_required(&archive, RES1_NODE_TABLE, "Res1")?;
+    let res2 = read_required(&archive, RES2_SLOTS, "Res2")?;
+    let res3 = read_required(&archive, RES3_POSITIONS, "Res3")?;
+    let res6 = read_required(&archive, RES6_INDICES, "Res6")?;
+    let res13 = read_required(&archive, RES13_BATCHES, "Res13")?;
+
+    let res4 = read_optional(&archive, RES4_NORMALS)?;
+    let res5 = read_optional(&archive, RES5_UV0)?;
+    let res10 = read_optional(&archive, RES10_NAMES)?;
+
+    let node_stride = usize::try_from(res1.meta.attr3).map_err(|_| Error::IntegerOverflow)?;
+    if node_stride != 38 && node_stride != 24 {
+        return Err(Error::UnsupportedNodeStride {
+            stride: node_stride,
+        });
+    }
+    if res1.bytes.len() % node_stride != 0 {
+        return Err(Error::InvalidResourceSize {
+            label: "Res1",
+            size: res1.bytes.len(),
+            stride: node_stride,
+        });
+    }
+    let node_count = res1.bytes.len() / node_stride;
+
+    if res2.bytes.len() < 0x8C {
+        return Err(Error::InvalidRes2Size {
+            size: res2.bytes.len(),
+        });
+    }
+    let slot_blob = res2
+        .bytes
+        .len()
+        .checked_sub(0x8C)
+        .ok_or(Error::IntegerOverflow)?;
+    if slot_blob % 68 != 0 {
+        return Err(Error::InvalidResourceSize {
+            label: "Res2.slots",
+            size: slot_blob,
+            stride: 68,
+        });
+    }
+    let slot_count = slot_blob / 68;
+    let mut slots = Vec::with_capacity(slot_count);
+    for i in 0..slot_count {
+        let off = 0x8Cusize
+            .checked_add(i.checked_mul(68).ok_or(Error::IntegerOverflow)?)
+            .ok_or(Error::IntegerOverflow)?;
+        slots.push(Slot {
+            tri_start: read_u16(&res2.bytes, off)?,
+            tri_count: read_u16(&res2.bytes, off + 2)?,
+            batch_start: read_u16(&res2.bytes, off + 4)?,
+            batch_count: read_u16(&res2.bytes, off + 6)?,
+            aabb_min: [
+                read_f32(&res2.bytes, off + 8)?,
+                read_f32(&res2.bytes, off + 12)?,
+                read_f32(&res2.bytes, off + 16)?,
+            ],
+            aabb_max: [
+                read_f32(&res2.bytes, off + 20)?,
+                read_f32(&res2.bytes, off + 24)?,
+                read_f32(&res2.bytes, off + 28)?,
+            ],
+            sphere_center: [
+                read_f32(&res2.bytes, off + 32)?,
+                read_f32(&res2.bytes, off + 36)?,
+                read_f32(&res2.bytes, off + 40)?,
+            ],
+            sphere_radius: read_f32(&res2.bytes, off + 44)?,
+            opaque: [
+                read_u32(&res2.bytes, off + 48)?,
+                read_u32(&res2.bytes, off + 52)?,
+                read_u32(&res2.bytes, off + 56)?,
+                read_u32(&res2.bytes, off + 60)?,
+                read_u32(&res2.bytes, off + 64)?,
+            ],
+        });
+    }
+
+    let positions = parse_positions(&res3.bytes)?;
+    let indices = parse_u16_array(&res6.bytes, "Res6")?;
+    let batches = parse_batches(&res13.bytes)?;
+
+    let normals = match res4 {
+        Some(raw) => Some(parse_i8x4_array(&raw.bytes, "Res4")?),
+        None => None,
+    };
+    let uv0 = match res5 {
+        Some(raw) => Some(parse_i16x2_array(&raw.bytes, "Res5")?),
+        None => None,
+    };
+    let node_names = match res10 {
+        Some(raw) => Some(parse_res10_names(&raw.bytes, node_count)?),
+        None => None,
+    };
+
+    Ok(Model {
+        node_stride,
+        node_count,
+        nodes_raw: res1.bytes,
+        slots,
+        positions,
+        normals,
+        uv0,
+        indices,
+        batches,
+        node_names,
+    })
+}
+
+fn parse_positions(data: &[u8]) -> Result<Vec<[f32; 3]>> {
+    if !data.len().is_multiple_of(12) {
+        return Err(Error::InvalidResourceSize {
+            label: "Res3",
+            size: data.len(),
+            stride: 12,
+        });
+    }
+    let count = data.len() / 12;
+    let mut out = Vec::with_capacity(count);
+    for i in 0..count {
+        let off = i * 12;
+        out.push([
+            read_f32(data, off)?,
+            read_f32(data, off + 4)?,
+            read_f32(data, off + 8)?,
+        ]);
+    }
+    Ok(out)
+}
+
+fn parse_batches(data: &[u8]) -> Result<Vec<Batch>> {
+    if !data.len().is_multiple_of(20) {
+        return Err(Error::InvalidResourceSize {
+            label: "Res13",
+            size: data.len(),
+            stride: 20,
+        });
+    }
+    let count = data.len() / 20;
+    let mut out = Vec::with_capacity(count);
+    for i in 0..count {
+        let off = i * 20;
+        out.push(Batch {
+            batch_flags: read_u16(data, off)?,
+            material_index: read_u16(data, off + 2)?,
+            opaque4: read_u16(data, off + 4)?,
+            opaque6: read_u16(data, off + 6)?,
+            index_count: read_u16(data, off + 8)?,
+            index_start: read_u32(data, off + 10)?,
+            opaque14: read_u16(data, off + 14)?,
+            base_vertex: read_u32(data, off + 16)?,
+        });
+    }
+    Ok(out)
+}
+
+fn parse_u16_array(data: &[u8], label: &'static str) -> Result<Vec<u16>> {
+    if !data.len().is_multiple_of(2) {
+        return Err(Error::InvalidResourceSize {
+            label,
+            size: data.len(),
+            stride: 2,
+        });
+    }
+    let mut out = Vec::with_capacity(data.len() / 2);
+    for i in (0..data.len()).step_by(2) {
+        out.push(read_u16(data, i)?);
+    }
+    Ok(out)
+}
+
+fn parse_i8x4_array(data: &[u8], label: &'static str) -> Result<Vec<[i8; 4]>> {
+    if !data.len().is_multiple_of(4) {
+        return Err(Error::InvalidResourceSize {
+            label,
+            size: data.len(),
+            stride: 4,
+        });
+    }
+    let mut out = Vec::with_capacity(data.len() / 4);
+    for i in (0..data.len()).step_by(4) {
+        out.push([
+            read_i8(data, i)?,
+            read_i8(data, i + 1)?,
+            read_i8(data, i + 2)?,
+            read_i8(data, i + 3)?,
+        ]);
+    }
+    Ok(out)
+}
+
+fn parse_i16x2_array(data: &[u8], label: &'static str) -> Result<Vec<[i16; 2]>> {
+    if !data.len().is_multiple_of(4) {
+        return Err(Error::InvalidResourceSize {
+            label,
+            size: data.len(),
+            stride: 4,
+        });
+    }
+    let mut out = Vec::with_capacity(data.len() / 4);
+    for i in (0..data.len()).step_by(4) {
+        out.push([read_i16(data, i)?, read_i16(data, i + 2)?]);
+    }
+    Ok(out)
+}
+
+fn parse_res10_names(data: &[u8], node_count: usize) -> Result<Vec<Option<String>>> {
+    let mut out = Vec::with_capacity(node_count);
+    let mut off = 0usize;
+    for _ in 0..node_count {
+        let len = usize::try_from(read_u32(data, off)?).map_err(|_| Error::IntegerOverflow)?;
+        off = off.checked_add(4).ok_or(Error::IntegerOverflow)?;
+        if len == 0 {
+            out.push(None);
+            continue;
+        }
+        let need = len.checked_add(1).ok_or(Error::IntegerOverflow)?;
+        let end = off.checked_add(need).ok_or(Error::IntegerOverflow)?;
+        let slice = data.get(off..end).ok_or(Error::InvalidResourceSize {
+            label: "Res10",
+            size: data.len(),
+            stride: 1,
+        })?;
+        let text = if slice.last().copied() == Some(0) {
+            &slice[..slice.len().saturating_sub(1)]
+        } else {
+            slice
+        };
+        let decoded = String::from_utf8_lossy(text).to_string();
+        out.push(Some(decoded));
+        off = end;
+    }
+    Ok(out)
+}
+
+struct RawResource {
+    meta: nres::EntryMeta,
+    bytes: Vec<u8>,
+}
+
+fn read_required(archive: &nres::Archive, kind: u32, label: &'static str) -> Result<RawResource> {
+    let id = archive
+        .entries()
+        .find(|entry| entry.meta.kind == kind)
+        .map(|entry| entry.id)
+        .ok_or(Error::MissingResource { kind, label })?;
+    let entry = archive.get(id).ok_or(Error::IndexOutOfBounds {
+        label,
+        index: usize::try_from(id.0).map_err(|_| Error::IntegerOverflow)?,
+        limit: archive.entry_count(),
+    })?;
+    let data = archive.read(id)?.into_owned();
+    Ok(RawResource {
+        meta: entry.meta.clone(),
+        bytes: data,
+    })
+}
+
+fn read_optional(archive: &nres::Archive, kind: u32) -> Result<Option<RawResource>> {
+    let Some(id) = archive
+        .entries()
+        .find(|entry| entry.meta.kind == kind)
+        .map(|entry| entry.id)
+    else {
+        return Ok(None);
+    };
+    let entry = archive.get(id).ok_or(Error::IndexOutOfBounds {
+        label: "optional",
+        index: usize::try_from(id.0).map_err(|_| Error::IntegerOverflow)?,
+        limit: archive.entry_count(),
+    })?;
+    let data = archive.read(id)?.into_owned();
+    Ok(Some(RawResource {
+        meta: entry.meta.clone(),
+        bytes: data,
+    }))
+}
+
+fn read_u16(data: &[u8], offset: usize) -> Result<u16> {
+    let bytes = data.get(offset..offset + 2).ok_or(Error::IntegerOverflow)?;
+    let arr: [u8; 2] = bytes.try_into().map_err(|_| Error::IntegerOverflow)?;
+    Ok(u16::from_le_bytes(arr))
+}
+
+fn read_i16(data: &[u8], offset: usize) -> Result<i16> {
+    let bytes = data.get(offset..offset + 2).ok_or(Error::IntegerOverflow)?;
+    let arr: [u8; 2] = bytes.try_into().map_err(|_| Error::IntegerOverflow)?;
+    Ok(i16::from_le_bytes(arr))
+}
+
+fn read_i8(data: &[u8], offset: usize) -> Result<i8> {
+    let byte = data.get(offset).copied().ok_or(Error::IntegerOverflow)?;
+    Ok(i8::from_le_bytes([byte]))
+}
+
+fn read_u32(data: &[u8], offset: usize) -> Result<u32> {
+    let bytes = data.get(offset..offset + 4).ok_or(Error::IntegerOverflow)?;
+    let arr: [u8; 4] = bytes.try_into().map_err(|_| Error::IntegerOverflow)?;
+    Ok(u32::from_le_bytes(arr))
+}
+
+fn read_f32(data: &[u8], offset: usize) -> Result<f32> {
+    Ok(f32::from_bits(read_u32(data, offset)?))
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/crates/msh-core/src/tests.rs b/crates/msh-core/src/tests.rs
new file mode 100644
index 0000000..1eefb31
--- /dev/null
+++ b/crates/msh-core/src/tests.rs
@@ -0,0 +1,296 @@
+use super::*;
+use nres::Archive;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+fn collect_files_recursive(root: &Path, out: &mut Vec<PathBuf>) {
+    let Ok(entries) = fs::read_dir(root) else {
+        return;
+    };
+    for entry in entries.flatten() {
+        let path = entry.path();
+        if path.is_dir() {
+            collect_files_recursive(&path, out);
+        } else if path.is_file() {
+            out.push(path);
+        }
+    }
+}
+
+fn nres_test_files() -> Vec<PathBuf> {
+    let root = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("..")
+        .join("..")
+        .join("testdata");
+    let mut files = Vec::new();
+    collect_files_recursive(&root, &mut files);
+    files.sort();
+    files
+        .into_iter()
+        .filter(|path| {
+            fs::read(path)
+                .map(|bytes| bytes.get(0..4) == Some(b"NRes"))
+                .unwrap_or(false)
+        })
+        .collect()
+}
+
+fn is_msh_name(name: &str) -> bool {
+    name.to_ascii_lowercase().ends_with(".msh")
+}
+
+#[test]
+fn parse_all_game_msh_models() {
+    let archives = nres_test_files();
+    if archives.is_empty() {
+        eprintln!("skipping parse_all_game_msh_models: no NRes files in testdata");
+        return;
+    }
+
+    let mut model_count = 0usize;
+    let mut renderable_count = 0usize;
+    let mut legacy_stride24_count = 0usize;
+
+    for archive_path in archives {
+        let archive = Archive::open_path(&archive_path)
+            .unwrap_or_else(|err| panic!("failed to open {}: {err}", archive_path.display()));
+
+        for entry in archive.entries() {
+            if !is_msh_name(&entry.meta.name) {
+                continue;
+            }
+            model_count += 1;
+            let payload = archive.read(entry.id).unwrap_or_else(|err| {
+                panic!(
+                    "failed to read model '{}' in {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+            let model = parse_model_payload(payload.as_slice()).unwrap_or_else(|err| {
+                panic!(
+                    "failed to parse model '{}' in {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+
+            if model.node_stride == 24 {
+                legacy_stride24_count += 1;
+            }
+
+            for node_index in 0..model.node_count {
+                for lod in 0..3 {
+                    for group in 0..5 {
+                        if let Some(slot_idx) = model.slot_index(node_index, lod, group) {
+                            assert!(
+                                slot_idx < model.slots.len(),
+                                "slot index out of bounds in '{}' ({})",
+                                entry.meta.name,
+                                archive_path.display()
+                            );
+                        }
+                    }
+                }
+            }
+
+            let mut has_renderable_batch = false;
+            for node_index in 0..model.node_count {
+                let Some(slot_idx) = model.slot_index(node_index, 0, 0) else {
+                    continue;
+                };
+                let slot = &model.slots[slot_idx];
+                let batch_end =
+                    usize::from(slot.batch_start).saturating_add(usize::from(slot.batch_count));
+                if batch_end > model.batches.len() {
+                    continue;
+                }
+                for batch in &model.batches[usize::from(slot.batch_start)..batch_end] {
+                    let index_start = usize::try_from(batch.index_start).unwrap_or(usize::MAX);
+                    let index_count = usize::from(batch.index_count);
+                    let end = index_start.saturating_add(index_count);
+                    if end <= model.indices.len() && index_count >= 3 {
+                        has_renderable_batch = true;
+                        break;
+                    }
+                }
+                if has_renderable_batch {
+                    break;
+                }
+            }
+            if has_renderable_batch {
+                renderable_count += 1;
+            }
+        }
+    }
+
+    assert!(model_count > 0, "no .msh entries found");
+    assert!(
+        renderable_count > 0,
+        "no renderable models (lod0/group0) were detected"
+    );
+    assert!(
+        legacy_stride24_count <= model_count,
+        "internal test accounting error"
+    );
+}
+
+#[test]
+fn parse_minimal_synthetic_model() {
+    // Nested NRes with required resources only.
+    let mut payload = Vec::new();
+    payload.extend_from_slice(b"NRes");
+    payload.extend_from_slice(&0x100u32.to_le_bytes());
+    payload.extend_from_slice(&5u32.to_le_bytes()); // entry_count
+    payload.extend_from_slice(&0u32.to_le_bytes()); // total_size placeholder
+
+    let mut resource_offsets = Vec::new();
+    let mut resource_sizes = Vec::new();
+    let mut resource_types = Vec::new();
+    let mut resource_attr3 = Vec::new();
+    let mut resource_names = Vec::new();
+
+    let add_resource = |payload: &mut Vec<u8>,
+                        offsets: &mut Vec<u32>,
+                        sizes: &mut Vec<u32>,
+                        types: &mut Vec<u32>,
+                        attr3: &mut Vec<u32>,
+                        names: &mut Vec<String>,
+                        kind: u32,
+                        name: &str,
+                        data: &[u8],
+                        attr3_val: u32| {
+        offsets.push(u32::try_from(payload.len()).expect("offset overflow"));
+        payload.extend_from_slice(data);
+        while !payload.len().is_multiple_of(8) {
+            payload.push(0);
+        }
+        sizes.push(u32::try_from(data.len()).expect("size overflow"));
+        types.push(kind);
+        attr3.push(attr3_val);
+        names.push(name.to_string());
+    };
+
+    let node = {
+        let mut b = vec![0u8; 38];
+        // slot[0][0] = 0
+        b[8..10].copy_from_slice(&0u16.to_le_bytes());
+        for i in 1..15 {
+            let off = 8 + i * 2;
+            b[off..off + 2].copy_from_slice(&u16::MAX.to_le_bytes());
+        }
+        b
+    };
+    let mut res2 = vec![0u8; 0x8C + 68];
+    res2[0x8C..0x8C + 2].copy_from_slice(&0u16.to_le_bytes()); // tri_start
+    res2[0x8C + 2..0x8C + 4].copy_from_slice(&0u16.to_le_bytes()); // tri_count
+    res2[0x8C + 4..0x8C + 6].copy_from_slice(&0u16.to_le_bytes()); // batch_start
+    res2[0x8C + 6..0x8C + 8].copy_from_slice(&1u16.to_le_bytes()); // batch_count
+    let positions = [0f32, 0f32, 0f32, 1f32, 0f32, 0f32, 0f32, 1f32, 0f32]
+        .iter()
+        .flat_map(|v| v.to_le_bytes())
+        .collect::<Vec<_>>();
+    let indices = [0u16, 1, 2]
+        .iter()
+        .flat_map(|v| v.to_le_bytes())
+        .collect::<Vec<_>>();
+    let batch = {
+        let mut b = vec![0u8; 20];
+        b[0..2].copy_from_slice(&0u16.to_le_bytes());
+        b[2..4].copy_from_slice(&0u16.to_le_bytes());
+        b[8..10].copy_from_slice(&3u16.to_le_bytes()); // index_count
+        b[10..14].copy_from_slice(&0u32.to_le_bytes()); // index_start
+        b[16..20].copy_from_slice(&0u32.to_le_bytes()); // base_vertex
+        b
+    };
+
+    add_resource(
+        &mut payload,
+        &mut resource_offsets,
+        &mut resource_sizes,
+        &mut resource_types,
+        &mut resource_attr3,
+        &mut resource_names,
+        RES1_NODE_TABLE,
+        "Res1",
+        &node,
+        38,
+    );
+    add_resource(
+        &mut payload,
+        &mut resource_offsets,
+        &mut resource_sizes,
+        &mut resource_types,
+        &mut resource_attr3,
+        &mut resource_names,
+        RES2_SLOTS,
+        "Res2",
+        &res2,
+        68,
+    );
+    add_resource(
+        &mut payload,
+        &mut resource_offsets,
+        &mut resource_sizes,
+        &mut resource_types,
+        &mut resource_attr3,
+        &mut resource_names,
+        RES3_POSITIONS,
+        "Res3",
+        &positions,
+        12,
+    );
+    add_resource(
+        &mut payload,
+        &mut resource_offsets,
+        &mut resource_sizes,
+        &mut resource_types,
+        &mut resource_attr3,
+        &mut resource_names,
+        RES6_INDICES,
+        "Res6",
+        &indices,
+        2,
+    );
+    add_resource(
+        &mut payload,
+        &mut resource_offsets,
+        &mut resource_sizes,
+        &mut resource_types,
+        &mut resource_attr3,
+        &mut resource_names,
+        RES13_BATCHES,
+        "Res13",
+        &batch,
+        20,
+    );
+
+    let directory_offset = payload.len();
+    for i in 0..resource_types.len() {
+        payload.extend_from_slice(&resource_types[i].to_le_bytes());
+        payload.extend_from_slice(&1u32.to_le_bytes()); // attr1
+        payload.extend_from_slice(&0u32.to_le_bytes()); // attr2
+        payload.extend_from_slice(&resource_sizes[i].to_le_bytes());
+        payload.extend_from_slice(&resource_attr3[i].to_le_bytes());
+        let mut name_raw = [0u8; 36];
+        let bytes = resource_names[i].as_bytes();
+        name_raw[..bytes.len()].copy_from_slice(bytes);
+        payload.extend_from_slice(&name_raw);
+        payload.extend_from_slice(&resource_offsets[i].to_le_bytes());
+        payload.extend_from_slice(&(i as u32).to_le_bytes()); // sort index
+    }
+    let total_size = u32::try_from(payload.len()).expect("size overflow");
+    payload[12..16].copy_from_slice(&total_size.to_le_bytes());
+    assert_eq!(
+        directory_offset + resource_types.len() * 64,
+        payload.len(),
+        "synthetic nested NRes layout invalid"
+    );
+
+    let model = parse_model_payload(&payload).expect("failed to parse synthetic model");
+    assert_eq!(model.node_count, 1);
+    assert_eq!(model.positions.len(), 3);
+    assert_eq!(model.indices.len(), 3);
+    assert_eq!(model.batches.len(), 1);
+    assert_eq!(model.slot_index(0, 0, 0), Some(0));
+}
diff --git a/crates/render-core/Cargo.toml b/crates/render-core/Cargo.toml
new file mode 100644
index 0000000..4bdaa9e
--- /dev/null
+++ b/crates/render-core/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "render-core"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+msh-core = { path = "../msh-core" }
+nres = { path = "../nres" }
diff --git a/crates/render-core/README.md b/crates/render-core/README.md
new file mode 100644
index 0000000..1b58aec
--- /dev/null
+++ b/crates/render-core/README.md
@@ -0,0 +1,14 @@
+# render-core
+
+CPU-подготовка draw-данных для моделей `MSH`.
+
+Покрывает:
+
+- обход `node -> slot -> batch`;
+- раскрытие индексов в triangle-list (`Vec<[f32;3]>`);
+- расчёт bounds по вершинам.
+
+Тесты:
+
+- построение рендер-сеток на реальных `.msh` из `testdata`;
+- unit-test bounds.
diff --git a/crates/render-core/src/lib.rs b/crates/render-core/src/lib.rs
new file mode 100644
index 0000000..8e0b5e8
--- /dev/null
+++ b/crates/render-core/src/lib.rs
@@ -0,0 +1,84 @@
+use msh_core::Model;
+
+#[derive(Clone, Debug)]
+pub struct RenderMesh {
+    pub vertices: Vec<[f32; 3]>,
+    pub batch_count: usize,
+}
+
+impl RenderMesh {
+    pub fn triangle_count(&self) -> usize {
+        self.vertices.len() / 3
+    }
+}
+
+/// Builds an expanded triangle list for a specific LOD/group pair.
+///
+/// The output is suitable for simple `glDrawArrays(GL_TRIANGLES, ...)` paths.
+pub fn build_render_mesh(model: &Model, lod: usize, group: usize) -> RenderMesh {
+    let mut vertices = Vec::new();
+    let mut batch_count = 0usize;
+
+    for node_index in 0..model.node_count {
+        let Some(slot_idx) = model.slot_index(node_index, lod, group) else {
+            continue;
+        };
+        let Some(slot) = model.slots.get(slot_idx) else {
+            continue;
+        };
+        let batch_start = usize::from(slot.batch_start);
+        let batch_end = batch_start.saturating_add(usize::from(slot.batch_count));
+        if batch_end > model.batches.len() {
+            continue;
+        }
+
+        for batch in &model.batches[batch_start..batch_end] {
+            let index_start = usize::try_from(batch.index_start).unwrap_or(usize::MAX);
+            let index_count = usize::from(batch.index_count);
+            let index_end = index_start.saturating_add(index_count);
+            if index_end > model.indices.len() || index_count < 3 {
+                continue;
+            }
+
+            for &idx in &model.indices[index_start..index_end] {
+                let final_idx_u64 = u64::from(batch.base_vertex).saturating_add(u64::from(idx));
+                let Ok(final_idx) = usize::try_from(final_idx_u64) else {
+                    continue;
+                };
+                let Some(pos) = model.positions.get(final_idx) else {
+                    continue;
+                };
+                vertices.push(*pos);
+            }
+            batch_count += 1;
+        }
+    }
+
+    RenderMesh {
+        vertices,
+        batch_count,
+    }
+}
+
+pub fn compute_bounds(vertices: &[[f32; 3]]) -> Option<([f32; 3], [f32; 3])> {
+    let mut iter = vertices.iter();
+    let first = iter.next()?;
+    let mut min_v = *first;
+    let mut max_v = *first;
+
+    for v in iter {
+        for i in 0..3 {
+            if v[i] < min_v[i] {
+                min_v[i] = v[i];
+            }
+            if v[i] > max_v[i] {
+                max_v[i] = v[i];
+            }
+        }
+    }
+
+    Some((min_v, max_v))
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/crates/render-core/src/tests.rs b/crates/render-core/src/tests.rs
new file mode 100644
index 0000000..9c5eb5d
--- /dev/null
+++ b/crates/render-core/src/tests.rs
@@ -0,0 +1,101 @@
+use super::*;
+use msh_core::parse_model_payload;
+use nres::Archive;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+fn collect_files_recursive(root: &Path, out: &mut Vec<PathBuf>) {
+    let Ok(entries) = fs::read_dir(root) else {
+        return;
+    };
+    for entry in entries.flatten() {
+        let path = entry.path();
+        if path.is_dir() {
+            collect_files_recursive(&path, out);
+        } else if path.is_file() {
+            out.push(path);
+        }
+    }
+}
+
+fn nres_test_files() -> Vec<PathBuf> {
+    let root = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("..")
+        .join("..")
+        .join("testdata");
+    let mut files = Vec::new();
+    collect_files_recursive(&root, &mut files);
+    files.sort();
+    files
+        .into_iter()
+        .filter(|path| {
+            fs::read(path)
+                .map(|bytes| bytes.get(0..4) == Some(b"NRes"))
+                .unwrap_or(false)
+        })
+        .collect()
+}
+
+#[test]
+fn build_render_mesh_for_real_models() {
+    let archives = nres_test_files();
+    if archives.is_empty() {
+        eprintln!("skipping build_render_mesh_for_real_models: no NRes files in testdata");
+        return;
+    }
+
+    let mut models_checked = 0usize;
+    let mut meshes_non_empty = 0usize;
+    let mut bounds_non_empty = 0usize;
+
+    for archive_path in archives {
+        let archive = Archive::open_path(&archive_path)
+            .unwrap_or_else(|err| panic!("failed to open {}: {err}", archive_path.display()));
+        for entry in archive.entries() {
+            if !entry.meta.name.to_ascii_lowercase().ends_with(".msh") {
+                continue;
+            }
+            models_checked += 1;
+            let payload = archive.read(entry.id).unwrap_or_else(|err| {
+                panic!(
+                    "failed to read model '{}' from {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+            let model = parse_model_payload(payload.as_slice()).unwrap_or_else(|err| {
+                panic!(
+                    "failed to parse model '{}' from {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+            let mesh = build_render_mesh(&model, 0, 0);
+            if !mesh.vertices.is_empty() {
+                meshes_non_empty += 1;
+            }
+            if compute_bounds(&mesh.vertices).is_some() {
+                bounds_non_empty += 1;
+            }
+        }
+    }
+
+    assert!(models_checked > 0, "no MSH models found");
+    assert!(
+        meshes_non_empty > 0,
+        "all generated render meshes are empty"
+    );
+    assert_eq!(
+        meshes_non_empty, bounds_non_empty,
+        "bounds must be available for every non-empty mesh"
+    );
+}
+
+#[test]
+fn compute_bounds_handles_empty_and_non_empty() {
+    assert!(compute_bounds(&[]).is_none());
+    let bounds = compute_bounds(&[[1.0, 2.0, 3.0], [-2.0, 5.0, 0.5], [0.0, -1.0, 9.0]])
+        .expect("bounds expected");
+    assert_eq!(bounds.0, [-2.0, -1.0, 0.5]);
+    assert_eq!(bounds.1, [1.0, 5.0, 9.0]);
+}
diff --git a/crates/render-demo/Cargo.toml b/crates/render-demo/Cargo.toml
new file mode 100644
index 0000000..376a25e
--- /dev/null
+++ b/crates/render-demo/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "render-demo"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+default = []
+demo = ["dep:sdl2", "dep:glow"]
+
+[dependencies]
+msh-core = { path = "../msh-core" }
+nres = { path = "../nres" }
+render-core = { path = "../render-core" }
+sdl2 = { version = "0.37", optional = true, default-features = false, features = ["bundled", "static-link"] }
+glow = { version = "0.16", optional = true }
+
+[[bin]]
+name = "parkan-render-demo"
+path = "src/main.rs"
+required-features = ["demo"]
diff --git a/crates/render-demo/README.md b/crates/render-demo/README.md
new file mode 100644
index 0000000..b33b18c
--- /dev/null
+++ b/crates/render-demo/README.md
@@ -0,0 +1,30 @@
+# render-demo
+
+Тестовый рендерер Parkan-моделей на Rust (`SDL2 + OpenGL ES 2.0`).
+
+## Назначение
+
+- Проверить, что `nres + msh-core + render-core` дают рабочий draw-path на реальных ассетах.
+- Служить минимальным reference-приложением.
+
+## Запуск
+
+```bash
+cargo run -p render-demo --features demo -- \
+  --archive "testdata/Parkan - Iron Strategy/animals.rlb" \
+  --model "A_L_01.msh" \
+  --lod 0 \
+  --group 0
+```
+
+Параметры:
+
+- `--archive` (обязательный): NRes-архив с `.msh` entry.
+- `--model` (опционально): имя модели; если не задано, берётся первая `.msh`.
+- `--lod` (опционально, default `0`).
+- `--group` (опционально, default `0`).
+
+## Ограничения
+
+- Рендер только геометрии (без материалов/текстур/FX).
+- Вывод через `glDrawArrays(GL_TRIANGLES)` из расширенного triangle-list.
diff --git a/crates/render-demo/build.rs b/crates/render-demo/build.rs
new file mode 100644
index 0000000..126d1d7
--- /dev/null
+++ b/crates/render-demo/build.rs
@@ -0,0 +1,4 @@
+fn main() {
+    #[cfg(windows)]
+    println!("cargo:rustc-link-lib=advapi32");
+}
diff --git a/crates/render-demo/src/lib.rs b/crates/render-demo/src/lib.rs
new file mode 100644
index 0000000..4c73c09
--- /dev/null
+++ b/crates/render-demo/src/lib.rs
@@ -0,0 +1,113 @@
+use msh_core::{parse_model_payload, Model};
+use nres::Archive;
+use std::path::Path;
+
+#[derive(Debug)]
+pub enum Error {
+    Nres(nres::error::Error),
+    Msh(msh_core::error::Error),
+    NoMshEntries,
+    ModelNotFound(String),
+}
+
+impl From<nres::error::Error> for Error {
+    fn from(value: nres::error::Error) -> Self {
+        Self::Nres(value)
+    }
+}
+
+impl From<msh_core::error::Error> for Error {
+    fn from(value: msh_core::error::Error) -> Self {
+        Self::Msh(value)
+    }
+}
+
+pub type Result<T> = core::result::Result<T, Error>;
+
+pub fn load_model_from_archive(path: &Path, model_name: Option<&str>) -> Result<Model> {
+    let archive = Archive::open_path(path)?;
+    let mut msh_entries = Vec::new();
+    for entry in archive.entries() {
+        if entry.meta.name.to_ascii_lowercase().ends_with(".msh") {
+            msh_entries.push((entry.id, entry.meta.name.clone()));
+        }
+    }
+    if msh_entries.is_empty() {
+        return Err(Error::NoMshEntries);
+    }
+
+    let target_id = if let Some(name) = model_name {
+        msh_entries
+            .iter()
+            .find(|(_, n)| n.eq_ignore_ascii_case(name))
+            .map(|(id, _)| *id)
+            .ok_or_else(|| Error::ModelNotFound(name.to_string()))?
+    } else {
+        msh_entries[0].0
+    };
+
+    let payload = archive.read(target_id)?;
+    Ok(parse_model_payload(payload.as_slice())?)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs;
+    use std::path::{Path, PathBuf};
+
+    fn collect_files_recursive(root: &Path, out: &mut Vec<PathBuf>) {
+        let Ok(entries) = fs::read_dir(root) else {
+            return;
+        };
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.is_dir() {
+                collect_files_recursive(&path, out);
+            } else if path.is_file() {
+                out.push(path);
+            }
+        }
+    }
+
+    fn archive_with_msh() -> Option<PathBuf> {
+        let root = Path::new(env!("CARGO_MANIFEST_DIR"))
+            .join("..")
+            .join("..")
+            .join("testdata");
+        let mut files = Vec::new();
+        collect_files_recursive(&root, &mut files);
+        files.sort();
+        for path in files {
+            let Ok(bytes) = fs::read(&path) else {
+                continue;
+            };
+            if bytes.get(0..4) != Some(b"NRes") {
+                continue;
+            }
+            let Ok(archive) = Archive::open_path(&path) else {
+                continue;
+            };
+            if archive
+                .entries()
+                .any(|entry| entry.meta.name.to_ascii_lowercase().ends_with(".msh"))
+            {
+                return Some(path);
+            }
+        }
+        None
+    }
+
+    #[test]
+    fn load_model_from_real_archive() {
+        let Some(path) = archive_with_msh() else {
+            eprintln!("skipping load_model_from_real_archive: no .msh archives in testdata");
+            return;
+        };
+        let model = load_model_from_archive(&path, None)
+            .unwrap_or_else(|err| panic!("failed to load model from {}: {err:?}", path.display()));
+        assert!(model.node_count > 0);
+        assert!(!model.positions.is_empty());
+        assert!(!model.indices.is_empty());
+    }
+}
diff --git a/crates/render-demo/src/main.rs b/crates/render-demo/src/main.rs
new file mode 100644
index 0000000..c991c80
--- /dev/null
+++ b/crates/render-demo/src/main.rs
@@ -0,0 +1,357 @@
+use glow::HasContext as _;
+use render_core::{build_render_mesh, compute_bounds};
+use render_demo::load_model_from_archive;
+use std::path::PathBuf;
+use std::time::Instant;
+
+struct Args {
+    archive: PathBuf,
+    model: Option<String>,
+    lod: usize,
+    group: usize,
+}
+
+fn parse_args() -> Result<Args, String> {
+    let mut archive = None;
+    let mut model = None;
+    let mut lod = 0usize;
+    let mut group = 0usize;
+
+    let mut it = std::env::args().skip(1);
+    while let Some(arg) = it.next() {
+        match arg.as_str() {
+            "--archive" => {
+                let value = it
+                    .next()
+                    .ok_or_else(|| String::from("missing value for --archive"))?;
+                archive = Some(PathBuf::from(value));
+            }
+            "--model" => {
+                let value = it
+                    .next()
+                    .ok_or_else(|| String::from("missing value for --model"))?;
+                model = Some(value);
+            }
+            "--lod" => {
+                let value = it
+                    .next()
+                    .ok_or_else(|| String::from("missing value for --lod"))?;
+                lod = value
+                    .parse::<usize>()
+                    .map_err(|_| String::from("invalid --lod value"))?;
+            }
+            "--group" => {
+                let value = it
+                    .next()
+                    .ok_or_else(|| String::from("missing value for --group"))?;
+                group = value
+                    .parse::<usize>()
+                    .map_err(|_| String::from("invalid --group value"))?;
+            }
+            "--help" | "-h" => {
+                print_help();
+                std::process::exit(0);
+            }
+            other => {
+                return Err(format!("unknown argument: {other}"));
+            }
+        }
+    }
+
+    let archive = archive.ok_or_else(|| String::from("missing required --archive"))?;
+    Ok(Args {
+        archive,
+        model,
+        lod,
+        group,
+    })
+}
+
+fn print_help() {
+    eprintln!("parkan-render-demo --archive <path> [--model <name.msh>] [--lod N] [--group N]");
+}
+
+fn main() {
+    let args = match parse_args() {
+        Ok(v) => v,
+        Err(err) => {
+            eprintln!("{err}");
+            print_help();
+            std::process::exit(2);
+        }
+    };
+
+    let model = match load_model_from_archive(&args.archive, args.model.as_deref()) {
+        Ok(v) => v,
+        Err(err) => {
+            eprintln!("failed to load model: {err:?}");
+            std::process::exit(1);
+        }
+    };
+
+    let mesh = build_render_mesh(&model, args.lod, args.group);
+    if mesh.vertices.is_empty() {
+        eprintln!(
+            "model has no renderable triangles for lod={} group={}",
+            args.lod, args.group
+        );
+        std::process::exit(1);
+    }
+    let Some((bounds_min, bounds_max)) = compute_bounds(&mesh.vertices) else {
+        eprintln!("failed to compute mesh bounds");
+        std::process::exit(1);
+    };
+
+    let center = [
+        0.5 * (bounds_min[0] + bounds_max[0]),
+        0.5 * (bounds_min[1] + bounds_max[1]),
+        0.5 * (bounds_min[2] + bounds_max[2]),
+    ];
+    let extent = [
+        bounds_max[0] - bounds_min[0],
+        bounds_max[1] - bounds_min[1],
+        bounds_max[2] - bounds_min[2],
+    ];
+    let radius =
+        (extent[0] * extent[0] + extent[1] * extent[1] + extent[2] * extent[2]).sqrt() * 0.5;
+    let camera_distance = (radius * 2.5).max(2.0);
+
+    let sdl = sdl2::init().expect("failed to init SDL2");
+    let video = sdl.video().expect("failed to init SDL2 video");
+
+    {
+        let gl_attr = video.gl_attr();
+        gl_attr.set_context_profile(sdl2::video::GLProfile::GLES);
+        gl_attr.set_context_version(2, 0);
+        gl_attr.set_depth_size(24);
+        gl_attr.set_double_buffer(true);
+    }
+
+    let window = video
+        .window("Parkan Render Demo (SDL2 + OpenGL ES 2.0)", 1280, 720)
+        .opengl()
+        .resizable()
+        .build()
+        .expect("failed to create window");
+
+    let gl_ctx = window
+        .gl_create_context()
+        .expect("failed to create OpenGL context");
+    window
+        .gl_make_current(&gl_ctx)
+        .expect("failed to make GL context current");
+    let _ = video.gl_set_swap_interval(1);
+
+    let mut vertices_flat = Vec::with_capacity(mesh.vertices.len() * 3);
+    for pos in &mesh.vertices {
+        vertices_flat.extend_from_slice(pos);
+    }
+
+    let gl = unsafe {
+        glow::Context::from_loader_function(|name| video.gl_get_proc_address(name) as *const _)
+    };
+
+    let program = unsafe { create_program(&gl).expect("failed to create shader program") };
+    let u_mvp = unsafe { gl.get_uniform_location(program, "u_mvp") };
+    let a_pos = unsafe { gl.get_attrib_location(program, "a_pos") };
+    let a_pos = a_pos.expect("shader attribute a_pos is missing");
+
+    let vbo = unsafe { gl.create_buffer().expect("failed to create VBO") };
+    unsafe {
+        gl.bind_buffer(glow::ARRAY_BUFFER, Some(vbo));
+        gl.buffer_data_u8_slice(
+            glow::ARRAY_BUFFER,
+            cast_slice_u8(&vertices_flat),
+            glow::STATIC_DRAW,
+        );
+        gl.bind_buffer(glow::ARRAY_BUFFER, None);
+    }
+
+    let mut events = sdl.event_pump().expect("failed to get SDL event pump");
+    let start = Instant::now();
+
+    'main_loop: loop {
+        for event in events.poll_iter() {
+            match event {
+                sdl2::event::Event::Quit { .. } => break 'main_loop,
+                sdl2::event::Event::KeyDown {
+                    keycode: Some(sdl2::keyboard::Keycode::Escape),
+                    ..
+                } => break 'main_loop,
+                _ => {}
+            }
+        }
+
+        let elapsed = start.elapsed().as_secs_f32();
+        let (w, h) = window.size();
+        let aspect = (w as f32 / (h.max(1) as f32)).max(0.01);
+
+        let proj = mat4_perspective(60.0_f32.to_radians(), aspect, 0.01, camera_distance * 10.0);
+        let view = mat4_translation(0.0, 0.0, -camera_distance);
+        let center_shift = mat4_translation(-center[0], -center[1], -center[2]);
+        let rot = mat4_rotation_y(elapsed * 0.35);
+        let model_m = mat4_mul(&rot, &center_shift);
+        let vp = mat4_mul(&view, &model_m);
+        let mvp = mat4_mul(&proj, &vp);
+
+        unsafe {
+            gl.viewport(0, 0, w as i32, h as i32);
+            gl.enable(glow::DEPTH_TEST);
+            gl.clear_color(0.06, 0.08, 0.12, 1.0);
+            gl.clear(glow::COLOR_BUFFER_BIT | glow::DEPTH_BUFFER_BIT);
+
+            gl.use_program(Some(program));
+            gl.uniform_matrix_4_f32_slice(u_mvp.as_ref(), false, &mvp);
+
+            gl.bind_buffer(glow::ARRAY_BUFFER, Some(vbo));
+            gl.enable_vertex_attrib_array(a_pos);
+            gl.vertex_attrib_pointer_f32(a_pos, 3, glow::FLOAT, false, 12, 0);
+            gl.draw_arrays(
+                glow::TRIANGLES,
+                0,
+                i32::try_from(mesh.vertices.len()).unwrap_or(i32::MAX),
+            );
+            gl.disable_vertex_attrib_array(a_pos);
+            gl.bind_buffer(glow::ARRAY_BUFFER, None);
+            gl.use_program(None);
+        }
+
+        window.gl_swap_window();
+    }
+
+    unsafe {
+        gl.delete_buffer(vbo);
+        gl.delete_program(program);
+    }
+}
+
+unsafe fn create_program(gl: &glow::Context) -> Result<glow::NativeProgram, String> {
+    let vs_src = r#"
+attribute vec3 a_pos;
+uniform mat4 u_mvp;
+void main() {
+    gl_Position = u_mvp * vec4(a_pos, 1.0);
+}
+"#;
+
+    let fs_src = r#"
+precision mediump float;
+void main() {
+    gl_FragColor = vec4(0.85, 0.90, 1.00, 1.0);
+}
+"#;
+
+    let program = gl.create_program().map_err(|e| e.to_string())?;
+    let vs = gl
+        .create_shader(glow::VERTEX_SHADER)
+        .map_err(|e| e.to_string())?;
+    let fs = gl
+        .create_shader(glow::FRAGMENT_SHADER)
+        .map_err(|e| e.to_string())?;
+
+    gl.shader_source(vs, vs_src);
+    gl.compile_shader(vs);
+    if !gl.get_shader_compile_status(vs) {
+        let log = gl.get_shader_info_log(vs);
+        gl.delete_shader(vs);
+        gl.delete_shader(fs);
+        gl.delete_program(program);
+        return Err(format!("vertex shader compile failed: {log}"));
+    }
+
+    gl.shader_source(fs, fs_src);
+    gl.compile_shader(fs);
+    if !gl.get_shader_compile_status(fs) {
+        let log = gl.get_shader_info_log(fs);
+        gl.delete_shader(vs);
+        gl.delete_shader(fs);
+        gl.delete_program(program);
+        return Err(format!("fragment shader compile failed: {log}"));
+    }
+
+    gl.attach_shader(program, vs);
+    gl.attach_shader(program, fs);
+    gl.link_program(program);
+
+    gl.detach_shader(program, vs);
+    gl.detach_shader(program, fs);
+    gl.delete_shader(vs);
+    gl.delete_shader(fs);
+
+    if !gl.get_program_link_status(program) {
+        let log = gl.get_program_info_log(program);
+        gl.delete_program(program);
+        return Err(format!("program link failed: {log}"));
+    }
+
+    Ok(program)
+}
+
+fn cast_slice_u8<T>(slice: &[T]) -> &[u8] {
+    unsafe { std::slice::from_raw_parts(slice.as_ptr() as *const u8, std::mem::size_of_val(slice)) }
+}
+
+fn mat4_identity() -> [f32; 16] {
+    [
+        1.0, 0.0, 0.0, 0.0, //
+        0.0, 1.0, 0.0, 0.0, //
+        0.0, 0.0, 1.0, 0.0, //
+        0.0, 0.0, 0.0, 1.0, //
+    ]
+}
+
+fn mat4_translation(x: f32, y: f32, z: f32) -> [f32; 16] {
+    let mut m = mat4_identity();
+    m[12] = x;
+    m[13] = y;
+    m[14] = z;
+    m
+}
+
+fn mat4_rotation_y(rad: f32) -> [f32; 16] {
+    let c = rad.cos();
+    let s = rad.sin();
+    [
+        c, 0.0, -s, 0.0, //
+        0.0, 1.0, 0.0, 0.0, //
+        s, 0.0, c, 0.0, //
+        0.0, 0.0, 0.0, 1.0, //
+    ]
+}
+
+fn mat4_perspective(fovy: f32, aspect: f32, near: f32, far: f32) -> [f32; 16] {
+    let f = 1.0 / (0.5 * fovy).tan();
+    let nf = 1.0 / (near - far);
+    [
+        f / aspect,
+        0.0,
+        0.0,
+        0.0,
+        0.0,
+        f,
+        0.0,
+        0.0,
+        0.0,
+        0.0,
+        (far + near) * nf,
+        -1.0,
+        0.0,
+        0.0,
+        (2.0 * far * near) * nf,
+        0.0,
+    ]
+}
+
+fn mat4_mul(a: &[f32; 16], b: &[f32; 16]) -> [f32; 16] {
+    let mut out = [0.0f32; 16];
+    for c in 0..4 {
+        for r in 0..4 {
+            let mut acc = 0.0f32;
+            for k in 0..4 {
+                acc += a[k * 4 + r] * b[c * 4 + k];
+            }
+            out[c * 4 + r] = acc;
+        }
+    }
+    out
+}
diff --git a/crates/texm/Cargo.toml b/crates/texm/Cargo.toml
new file mode 100644
index 0000000..7085293
--- /dev/null
+++ b/crates/texm/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "texm"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+nres = { path = "../nres" }
diff --git a/crates/texm/README.md b/crates/texm/README.md
new file mode 100644
index 0000000..370ac54
--- /dev/null
+++ b/crates/texm/README.md
@@ -0,0 +1,15 @@
+# texm
+
+Парсер формата текстур `Texm`.
+
+Покрывает:
+
+- header (`width/height/mipCount/flags/format`);
+- core size расчёт;
+- optional `Page` chunk;
+- строгую валидацию layout.
+
+Тесты:
+
+- прогон по реальным `Texm` из `testdata`;
+- синтетические edge-cases (indexed + page, minimal rgba).
diff --git a/crates/texm/src/error.rs b/crates/texm/src/error.rs
new file mode 100644
index 0000000..a5dda77
--- /dev/null
+++ b/crates/texm/src/error.rs
@@ -0,0 +1,61 @@
+use core::fmt;
+
+#[derive(Debug)]
+pub enum Error {
+    HeaderTooSmall {
+        size: usize,
+    },
+    InvalidMagic {
+        got: u32,
+    },
+    InvalidDimensions {
+        width: u32,
+        height: u32,
+    },
+    InvalidMipCount {
+        mip_count: u32,
+    },
+    UnknownFormat {
+        format: u32,
+    },
+    IntegerOverflow,
+    CoreDataOutOfBounds {
+        expected_end: usize,
+        actual_size: usize,
+    },
+    InvalidPageMagic,
+    InvalidPageSize {
+        expected: usize,
+        actual: usize,
+    },
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::HeaderTooSmall { size } => {
+                write!(f, "Texm payload too small for header: {size}")
+            }
+            Self::InvalidMagic { got } => write!(f, "invalid Texm magic: 0x{got:08X}"),
+            Self::InvalidDimensions { width, height } => {
+                write!(f, "invalid Texm dimensions: {width}x{height}")
+            }
+            Self::InvalidMipCount { mip_count } => write!(f, "invalid Texm mip_count={mip_count}"),
+            Self::UnknownFormat { format } => write!(f, "unknown Texm format={format}"),
+            Self::IntegerOverflow => write!(f, "integer overflow"),
+            Self::CoreDataOutOfBounds {
+                expected_end,
+                actual_size,
+            } => write!(
+                f,
+                "Texm core data out of bounds: expected_end={expected_end}, actual_size={actual_size}"
+            ),
+            Self::InvalidPageMagic => write!(f, "Texm tail exists but Page magic is missing"),
+            Self::InvalidPageSize { expected, actual } => {
+                write!(f, "invalid Page chunk size: expected={expected}, actual={actual}")
+            }
+        }
+    }
+}
+
+impl std::error::Error for Error {}
diff --git a/crates/texm/src/lib.rs b/crates/texm/src/lib.rs
new file mode 100644
index 0000000..c3616d5
--- /dev/null
+++ b/crates/texm/src/lib.rs
@@ -0,0 +1,258 @@
+pub mod error;
+
+use crate::error::Error;
+
+pub type Result<T> = core::result::Result<T, Error>;
+
+pub const TEXM_MAGIC: u32 = 0x6D78_6554;
+pub const PAGE_MAGIC: u32 = 0x6567_6150;
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum PixelFormat {
+    Indexed8,
+    Rgb565,
+    Rgb556,
+    Argb4444,
+    LuminanceAlpha88,
+    Rgb888,
+    Argb8888,
+}
+
+impl PixelFormat {
+    pub fn from_raw(raw: u32) -> Option<Self> {
+        match raw {
+            0 => Some(Self::Indexed8),
+            565 => Some(Self::Rgb565),
+            556 => Some(Self::Rgb556),
+            4444 => Some(Self::Argb4444),
+            88 => Some(Self::LuminanceAlpha88),
+            888 => Some(Self::Rgb888),
+            8888 => Some(Self::Argb8888),
+            _ => None,
+        }
+    }
+
+    pub fn bytes_per_pixel(self) -> usize {
+        match self {
+            Self::Indexed8 => 1,
+            Self::Rgb565 | Self::Rgb556 | Self::Argb4444 | Self::LuminanceAlpha88 => 2,
+            Self::Rgb888 | Self::Argb8888 => 4,
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Header {
+    pub width: u32,
+    pub height: u32,
+    pub mip_count: u32,
+    pub flags4: u32,
+    pub flags5: u32,
+    pub unk6: u32,
+    pub format_raw: u32,
+    pub format: PixelFormat,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct MipLevel {
+    pub width: u32,
+    pub height: u32,
+    pub offset: usize,
+    pub size: usize,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct PageRect {
+    pub x: i16,
+    pub w: i16,
+    pub y: i16,
+    pub h: i16,
+}
+
+#[derive(Clone, Debug)]
+pub struct Texture {
+    pub header: Header,
+    pub palette: Option<[u8; 1024]>,
+    pub mip_levels: Vec<MipLevel>,
+    pub page_rects: Vec<PageRect>,
+}
+
+impl Texture {
+    pub fn core_size(&self) -> usize {
+        let mut size = 32usize;
+        if self.palette.is_some() {
+            size += 1024;
+        }
+        for level in &self.mip_levels {
+            size += level.size;
+        }
+        size
+    }
+}
+
+pub fn parse_texm(payload: &[u8]) -> Result<Texture> {
+    if payload.len() < 32 {
+        return Err(Error::HeaderTooSmall {
+            size: payload.len(),
+        });
+    }
+
+    let magic = read_u32(payload, 0)?;
+    if magic != TEXM_MAGIC {
+        return Err(Error::InvalidMagic { got: magic });
+    }
+
+    let width = read_u32(payload, 4)?;
+    let height = read_u32(payload, 8)?;
+    let mip_count = read_u32(payload, 12)?;
+    let flags4 = read_u32(payload, 16)?;
+    let flags5 = read_u32(payload, 20)?;
+    let unk6 = read_u32(payload, 24)?;
+    let format_raw = read_u32(payload, 28)?;
+
+    if width == 0 || height == 0 {
+        return Err(Error::InvalidDimensions { width, height });
+    }
+    if mip_count == 0 {
+        return Err(Error::InvalidMipCount { mip_count });
+    }
+
+    let format =
+        PixelFormat::from_raw(format_raw).ok_or(Error::UnknownFormat { format: format_raw })?;
+    let bytes_per_pixel = format.bytes_per_pixel();
+
+    let mut offset = 32usize;
+    let palette = if format == PixelFormat::Indexed8 {
+        let end = offset.checked_add(1024).ok_or(Error::IntegerOverflow)?;
+        if end > payload.len() {
+            return Err(Error::CoreDataOutOfBounds {
+                expected_end: end,
+                actual_size: payload.len(),
+            });
+        }
+        let mut pal = [0u8; 1024];
+        pal.copy_from_slice(&payload[offset..end]);
+        offset = end;
+        Some(pal)
+    } else {
+        None
+    };
+
+    let mut mip_levels =
+        Vec::with_capacity(usize::try_from(mip_count).map_err(|_| Error::IntegerOverflow)?);
+    let mut w = width;
+    let mut h = height;
+    for _ in 0..mip_count {
+        let pixel_count_u64 = u64::from(w)
+            .checked_mul(u64::from(h))
+            .ok_or(Error::IntegerOverflow)?;
+        let level_size_u64 = pixel_count_u64
+            .checked_mul(u64::try_from(bytes_per_pixel).map_err(|_| Error::IntegerOverflow)?)
+            .ok_or(Error::IntegerOverflow)?;
+        let level_size = usize::try_from(level_size_u64).map_err(|_| Error::IntegerOverflow)?;
+        let level_offset = offset;
+        offset = offset
+            .checked_add(level_size)
+            .ok_or(Error::IntegerOverflow)?;
+        if offset > payload.len() {
+            return Err(Error::CoreDataOutOfBounds {
+                expected_end: offset,
+                actual_size: payload.len(),
+            });
+        }
+        mip_levels.push(MipLevel {
+            width: w,
+            height: h,
+            offset: level_offset,
+            size: level_size,
+        });
+        w = w.max(1) >> 1;
+        h = h.max(1) >> 1;
+        if w == 0 {
+            w = 1;
+        }
+        if h == 0 {
+            h = 1;
+        }
+    }
+
+    let page_rects = parse_page_tail(payload, offset)?;
+
+    Ok(Texture {
+        header: Header {
+            width,
+            height,
+            mip_count,
+            flags4,
+            flags5,
+            unk6,
+            format_raw,
+            format,
+        },
+        palette,
+        mip_levels,
+        page_rects,
+    })
+}
+
+fn parse_page_tail(payload: &[u8], core_end: usize) -> Result<Vec<PageRect>> {
+    if core_end == payload.len() {
+        return Ok(Vec::new());
+    }
+    if payload.len().saturating_sub(core_end) < 8 {
+        return Err(Error::InvalidPageSize {
+            expected: 8,
+            actual: payload.len().saturating_sub(core_end),
+        });
+    }
+    let magic = read_u32(payload, core_end)?;
+    if magic != PAGE_MAGIC {
+        return Err(Error::InvalidPageMagic);
+    }
+    let rect_count = read_u32(payload, core_end + 4)?;
+    let rect_count_usize = usize::try_from(rect_count).map_err(|_| Error::IntegerOverflow)?;
+    let expected_size = 8usize
+        .checked_add(
+            rect_count_usize
+                .checked_mul(8)
+                .ok_or(Error::IntegerOverflow)?,
+        )
+        .ok_or(Error::IntegerOverflow)?;
+    let actual = payload.len().saturating_sub(core_end);
+    if expected_size != actual {
+        return Err(Error::InvalidPageSize {
+            expected: expected_size,
+            actual,
+        });
+    }
+
+    let mut rects = Vec::with_capacity(rect_count_usize);
+    for i in 0..rect_count_usize {
+        let off = core_end
+            .checked_add(8)
+            .and_then(|v| v.checked_add(i * 8))
+            .ok_or(Error::IntegerOverflow)?;
+        rects.push(PageRect {
+            x: read_i16(payload, off)?,
+            w: read_i16(payload, off + 2)?,
+            y: read_i16(payload, off + 4)?,
+            h: read_i16(payload, off + 6)?,
+        });
+    }
+    Ok(rects)
+}
+
+fn read_u32(data: &[u8], offset: usize) -> Result<u32> {
+    let bytes = data.get(offset..offset + 4).ok_or(Error::IntegerOverflow)?;
+    let arr: [u8; 4] = bytes.try_into().map_err(|_| Error::IntegerOverflow)?;
+    Ok(u32::from_le_bytes(arr))
+}
+
+fn read_i16(data: &[u8], offset: usize) -> Result<i16> {
+    let bytes = data.get(offset..offset + 2).ok_or(Error::IntegerOverflow)?;
+    let arr: [u8; 2] = bytes.try_into().map_err(|_| Error::IntegerOverflow)?;
+    Ok(i16::from_le_bytes(arr))
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/crates/texm/src/tests.rs b/crates/texm/src/tests.rs
new file mode 100644
index 0000000..d021346
--- /dev/null
+++ b/crates/texm/src/tests.rs
@@ -0,0 +1,150 @@
+use super::*;
+use nres::Archive;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+fn collect_files_recursive(root: &Path, out: &mut Vec<PathBuf>) {
+    let Ok(entries) = fs::read_dir(root) else {
+        return;
+    };
+    for entry in entries.flatten() {
+        let path = entry.path();
+        if path.is_dir() {
+            collect_files_recursive(&path, out);
+        } else if path.is_file() {
+            out.push(path);
+        }
+    }
+}
+
+fn nres_test_files() -> Vec<PathBuf> {
+    let root = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("..")
+        .join("..")
+        .join("testdata");
+    let mut files = Vec::new();
+    collect_files_recursive(&root, &mut files);
+    files.sort();
+    files
+        .into_iter()
+        .filter(|path| {
+            fs::read(path)
+                .map(|bytes| bytes.get(0..4) == Some(b"NRes"))
+                .unwrap_or(false)
+        })
+        .collect()
+}
+
+#[test]
+fn texm_parse_all_game_textures() {
+    let archives = nres_test_files();
+    if archives.is_empty() {
+        eprintln!("skipping texm_parse_all_game_textures: no NRes files in testdata");
+        return;
+    }
+
+    let mut texm_total = 0usize;
+    let mut texm_with_page = 0usize;
+    for archive_path in archives {
+        let archive = Archive::open_path(&archive_path)
+            .unwrap_or_else(|err| panic!("failed to open {}: {err}", archive_path.display()));
+
+        for entry in archive.entries() {
+            if entry.meta.kind != TEXM_MAGIC {
+                continue;
+            }
+            texm_total += 1;
+            let payload = archive.read(entry.id).unwrap_or_else(|err| {
+                panic!(
+                    "failed to read Texm entry '{}' in {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+            let texture = parse_texm(payload.as_slice()).unwrap_or_else(|err| {
+                panic!(
+                    "failed to parse Texm '{}' in {}: {err}",
+                    entry.meta.name,
+                    archive_path.display()
+                )
+            });
+            if !texture.page_rects.is_empty() {
+                texm_with_page += 1;
+            }
+
+            assert!(
+                texture.core_size() <= payload.as_slice().len(),
+                "core size must be within payload for '{}' in {}",
+                entry.meta.name,
+                archive_path.display()
+            );
+            assert_eq!(
+                usize::try_from(texture.header.mip_count).ok(),
+                Some(texture.mip_levels.len()),
+                "mip count mismatch for '{}' in {}",
+                entry.meta.name,
+                archive_path.display()
+            );
+        }
+    }
+
+    assert!(texm_total > 0, "no Texm textures found");
+    assert!(
+        texm_with_page > 0,
+        "expected at least one Texm texture with Page chunk"
+    );
+}
+
+#[test]
+fn texm_parse_minimal_argb8888_no_page() {
+    let mut payload = Vec::new();
+    payload.extend_from_slice(&TEXM_MAGIC.to_le_bytes());
+    payload.extend_from_slice(&1u32.to_le_bytes()); // width
+    payload.extend_from_slice(&1u32.to_le_bytes()); // height
+    payload.extend_from_slice(&1u32.to_le_bytes()); // mip_count
+    payload.extend_from_slice(&0u32.to_le_bytes()); // flags4
+    payload.extend_from_slice(&0u32.to_le_bytes()); // flags5
+    payload.extend_from_slice(&0u32.to_le_bytes()); // unk6
+    payload.extend_from_slice(&8888u32.to_le_bytes()); // format
+    payload.extend_from_slice(&[1, 2, 3, 4]); // one pixel
+
+    let parsed = parse_texm(&payload).expect("failed to parse minimal texm");
+    assert_eq!(parsed.header.width, 1);
+    assert_eq!(parsed.header.height, 1);
+    assert_eq!(parsed.mip_levels.len(), 1);
+    assert!(parsed.page_rects.is_empty());
+}
+
+#[test]
+fn texm_parse_indexed_with_page_chunk() {
+    let mut payload = Vec::new();
+    payload.extend_from_slice(&TEXM_MAGIC.to_le_bytes());
+    payload.extend_from_slice(&2u32.to_le_bytes()); // width
+    payload.extend_from_slice(&2u32.to_le_bytes()); // height
+    payload.extend_from_slice(&1u32.to_le_bytes()); // mip_count
+    payload.extend_from_slice(&0u32.to_le_bytes()); // flags4
+    payload.extend_from_slice(&0u32.to_le_bytes()); // flags5
+    payload.extend_from_slice(&0u32.to_le_bytes()); // unk6
+    payload.extend_from_slice(&0u32.to_le_bytes()); // format indexed8
+    payload.extend_from_slice(&[0u8; 1024]); // palette
+    payload.extend_from_slice(&[1, 2, 3, 4]); // pixels
+    payload.extend_from_slice(&PAGE_MAGIC.to_le_bytes());
+    payload.extend_from_slice(&1u32.to_le_bytes()); // rect_count
+    payload.extend_from_slice(&0i16.to_le_bytes()); // x
+    payload.extend_from_slice(&2i16.to_le_bytes()); // w
+    payload.extend_from_slice(&0i16.to_le_bytes()); // y
+    payload.extend_from_slice(&2i16.to_le_bytes()); // h
+
+    let parsed = parse_texm(&payload).expect("failed to parse indexed texm");
+    assert!(parsed.palette.is_some());
+    assert_eq!(parsed.page_rects.len(), 1);
+    assert_eq!(
+        parsed.page_rects[0],
+        PageRect {
+            x: 0,
+            w: 2,
+            y: 0,
+            h: 2
+        }
+    );
+}