From 0e19660eb5122c8c52d5e909927884ad5c50b813 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Thu, 19 Feb 2026 04:46:23 +0400
Subject: 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- Removed outdated sections from `runtime-pipeline.md` and redirected to `render.md`.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.
---
 crates/render-core/src/lib.rs | 84 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 crates/render-core/src/lib.rs

(limited to 'crates/render-core/src/lib.rs')

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;
-- 
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