feat(render): Renderer with LOD selection, 3.3 and 4.3+ upload paths, headless smoke test

src/render/primitives.cpp

@@ -27,6 +27,19 @@ void LineBatch::add_polyline(const Vec2* pts, u32 n) {
   }
 }
 
+void LineBatch::add_polyline_xy(const f32* xy, u32 n) {
+  if (xy == nullptr || n < 2u) {
+    return;
+  }
+  v_.reserve(v_.size() + 4u * (n - 1u));
+  for (u32 i = 1; i < n; ++i) {
+    v_.push_back(xy[2u * (i - 1u)]);
+    v_.push_back(xy[2u * (i - 1u) + 1u]);
+    v_.push_back(xy[2u * i]);
+    v_.push_back(xy[2u * i + 1u]);
+  }
+}
+
 // ----------------------------------------------------------------- TextBatch
 
 void TextBatch::begin() noexcept { v_.clear(); }