tick system, AVX2 UTF-8 decoder, uh faster in general

src/pane_resources.rs

@@ -0,0 +1,23 @@
+//! Per-pane GPU resources for multi-pane terminal rendering.
+//!
+//! This module provides GPU resource management for individual terminal panes,
+//! following Kitty's VAO-per-window approach where each pane gets its own
+//! buffers and bind group for independent rendering.
+
+// ═══════════════════════════════════════════════════════════════════════════════
+// PER-PANE GPU RESOURCES (Like Kitty's VAO per window)
+// ═══════════════════════════════════════════════════════════════════════════════
+
+/// GPU resources for a single pane.
+/// Like Kitty's VAO, each pane gets its own buffers and bind group.
+/// This allows uploading each pane's cell data independently before rendering.
+pub struct PaneGpuResources {
+    /// Cell storage buffer - contains GPUCell array for this pane's visible cells.
+    pub cell_buffer: wgpu::Buffer,
+    /// Grid parameters uniform buffer for this pane.
+    pub grid_params_buffer: wgpu::Buffer,
+    /// Bind group for instanced rendering (@group(1)) - references this pane's buffers.
+    pub bind_group: wgpu::BindGroup,
+    /// Buffer capacity (max cells) - used to detect when buffer needs resizing.
+    pub capacity: usize,
+}