1 files changed, 64 insertions, 0 deletions
diff --git a/src/mbgl/geometry/elements_buffer.hpp b/src/mbgl/geometry/elements_buffer.hpp
new file mode 100644
index 0000000000..9255337cb5
--- /dev/null
+++ b/src/mbgl/geometry/elements_buffer.hpp
@@ -0,0 +1,64 @@
+#ifndef MBGL_GEOMETRY_TRIANGLE_ELEMENTS_BUFFER
+#define MBGL_GEOMETRY_TRIANGLE_ELEMENTS_BUFFER
+
+#include <mbgl/geometry/buffer.hpp>
+#include <mbgl/geometry/vao.hpp>
+
+#include <mbgl/util/noncopyable.hpp>
+
+#include <array>
+
+namespace mbgl {
+
+template <int count>
+struct ElementGroup : public util::noncopyable {
+    std::array<VertexArrayObject, count> array;
+    uint32_t vertex_length;
+    uint32_t elements_length;
+
+    ElementGroup() : vertex_length(0), elements_length(0) {}
+    ElementGroup(uint32_t vertex_length_, uint32_t elements_length_)
+        : vertex_length(vertex_length_),
+          elements_length(elements_length_) {
+    }
+
+    ElementGroup(ElementGroup &&rhs) noexcept
+        : array(std::move(rhs.array)),
+          vertex_length(rhs.vertex_length),
+          elements_length(rhs.elements_length) {};
+};
+
+class TriangleElementsBuffer : public Buffer<
+    6, // bytes per triangle (3 * unsigned short == 6 bytes)
+    GL_ELEMENT_ARRAY_BUFFER
+> {
+public:
+    typedef uint16_t element_type;
+
+    void add(element_type a, element_type b, element_type c);
+};
+
+
+class LineElementsBuffer : public Buffer<
+    4, // bytes per triangle (2 * unsigned short == 6 bytes)
+    GL_ELEMENT_ARRAY_BUFFER
+> {
+public:
+    typedef uint16_t element_type;
+
+    void add(element_type a, element_type b);
+};
+
+class PointElementsBuffer : public Buffer<
+    2, // bytes per point (1 unsigned short)
+    GL_ELEMENT_ARRAY_BUFFER
+> {
+public:
+    typedef uint16_t element_type;
+
+    void add(element_type a);
+};
+
+}
+
+#endif