[core] Move RenderTile filtering / sorting logic to render layers

1 files changed, 11 insertions, 2 deletions

diff --git a/src/mbgl/renderer/render_layer.hpp b/src/mbgl/renderer/render_layer.hpp
index 8d17e318f2..04753fc674 100644
--- a/src/mbgl/renderer/render_layer.hpp
+++ b/src/mbgl/renderer/render_layer.hpp
@@ -86,7 +86,10 @@ public:
                                                ImageDependencies&) const {
         return nullptr;
     }
-    void setRenderTiles(std::vector<std::reference_wrapper<RenderTile>>);
+
+    using RenderTiles = std::vector<std::reference_wrapper<RenderTile>>;
+    void setRenderTiles(RenderTiles, const TransformState&);
+
     // Private implementation
     Immutable<style::Layer::Impl> baseImpl;
     void setImpl(Immutable<style::Layer::Impl>);
@@ -98,6 +101,12 @@ protected:
     // in the console to inform the developer.
     void checkRenderability(const PaintParameters&, uint32_t activeBindingCount);
 
+    // Code specific to RenderTiles sorting / filtering
+    virtual RenderTiles filterRenderTiles(RenderTiles) const;
+    virtual void sortRenderTiles(const TransformState&);
+    using FilterFunctionPtr = bool (*)(RenderTile&);
+    RenderTiles filterRenderTiles(RenderTiles, FilterFunctionPtr) const;
+
 protected:
     // renderTiles are exposed directly to CrossTileSymbolIndex and Placement so they
     // can update opacities in the symbol buckets immediately before rendering
@@ -111,7 +120,7 @@ protected:
     RenderPass passes = RenderPass::None;
 
 private:
-    // Some layers may not render correctly on some hardware when the vertex attribute limit of
+    // Some layers may not render correctly on some hardware when the vertex attribute limit of
     // that GPU is exceeded. More attributes are used when adding many data driven paint properties
     // to a layer.
     bool hasRenderFailures = false;