Add circle render type

As specified in:
https://github.com/mapbox/mapbox-gl-style-spec/blob/v8-circle/reference/v8.json

Part of #1740.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/mbgl/renderer/circle_bucket.hpp b/src/mbgl/renderer/circle_bucket.hpp
new file mode 100644
index 0000000000..727b9fa376
--- /dev/null
+++ b/src/mbgl/renderer/circle_bucket.hpp
@@ -0,0 +1,46 @@
+#ifndef MBGL_RENDERER_CIRCLE_BUCKET
+#define MBGL_RENDERER_CIRCLE_BUCKET
+
+#include <mbgl/renderer/bucket.hpp>
+
+#include <mbgl/map/geometry_tile.hpp>
+
+#include <mbgl/geometry/elements_buffer.hpp>
+#include <mbgl/geometry/circle_buffer.hpp>
+
+#include <mbgl/style/style_bucket.hpp>
+#include <mbgl/style/style_layout.hpp>
+
+namespace mbgl {
+
+class CircleVertexBuffer;
+class CircleShader;
+
+class CircleBucket : public Bucket {
+    using TriangleGroup = ElementGroup<3>;
+
+public:
+    CircleBucket(CircleVertexBuffer &vertexBuffer, TriangleElementsBuffer &elementsBuffer);
+    ~CircleBucket() override;
+
+    void upload() override;
+    void render(Painter&, const StyleLayer&, const TileID&, const mat4&) override;
+
+    bool hasData() const;
+    void addGeometry(const GeometryCollection&);
+
+    void drawCircles(CircleShader& shader);
+
+private:
+    CircleVertexBuffer& vertexBuffer_;
+    TriangleElementsBuffer& elementsBuffer_;
+
+    const size_t vertexStart_;
+    const size_t elementsStart_;
+
+    std::vector<std::unique_ptr<TriangleGroup>> triangleGroups_;
+};
+
+} // namespace mbgl
+
+#endif // MBGL_RENDERER_CIRCLE_BUCKET