1 files changed, 43 insertions, 0 deletions
diff --git a/src/mbgl/programs/segment.hpp b/src/mbgl/programs/segment.hpp
new file mode 100644
index 0000000000..f729683ac9
--- /dev/null
+++ b/src/mbgl/programs/segment.hpp
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <mbgl/gl/context.hpp>
+#include <mbgl/gl/vertex_array.hpp>
+
+#include <cstddef>
+#include <vector>
+#include <map>
+
+namespace mbgl {
+
+template <class Attributes>
+class Segment {
+public:
+    Segment(std::size_t vertexOffset_,
+            std::size_t indexOffset_,
+            std::size_t vertexLength_ = 0,
+            std::size_t indexLength_ = 0)
+        : vertexOffset(vertexOffset_),
+          indexOffset(indexOffset_),
+          vertexLength(vertexLength_),
+          indexLength(indexLength_) {}
+
+    const std::size_t vertexOffset;
+    const std::size_t indexOffset;
+
+    std::size_t vertexLength;
+    std::size_t indexLength;
+
+    // One VertexArray per layer ID. This minimizes rebinding in cases where
+    // several layers share buckets but have different sets of active attributes.
+    // This can happen:
+    //   * when two layers have the same layout properties, but differing
+    //     data-driven paint properties
+    //   * when two fill layers have the same layout properties, but one
+    //     uses fill-color and the other uses fill-pattern
+    mutable std::map<std::string, gl::VertexArray> vertexArrays;
+};
+
+template <class Attributes>
+using SegmentVector = std::vector<Segment<Attributes>>;
+
+} // namespace mbgl