1 files changed, 78 insertions, 0 deletions
diff --git a/src/mbgl/renderer/render_tree.hpp b/src/mbgl/renderer/render_tree.hpp
new file mode 100644
index 0000000000..4266ddec6d
--- /dev/null
+++ b/src/mbgl/renderer/render_tree.hpp
@@ -0,0 +1,78 @@
+#pragma once
+
+#include <mbgl/renderer/paint_parameters.hpp>
+
+#include <cassert>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace mbgl {
+
+class PaintParameters;
+class PatternAtlas;
+
+namespace gfx {
+class UploadPass;
+} // namespace gfx
+
+class RenderItem {
+public:
+    virtual ~RenderItem() = default;
+    virtual void upload(gfx::UploadPass&) const = 0;
+    virtual void render(PaintParameters&) const = 0;
+    virtual bool hasRenderPass(RenderPass) const = 0;
+    virtual const std::string& getName() const = 0; 
+};
+
+using RenderItems = std::vector<std::reference_wrapper<const RenderItem>>;
+
+class RenderTreeParameters {
+public:
+    explicit RenderTreeParameters(
+        const TransformState& state_,
+        MapMode mapMode_,
+        MapDebugOptions debugOptions_,
+        TimePoint timePoint_,
+        const EvaluatedLight& light_)
+        : transformParams(state_),
+          mapMode(mapMode_),
+          debugOptions(debugOptions_),
+          timePoint(timePoint_),
+          light(light_) {
+    }
+    TransformParameters transformParams;
+    MapMode mapMode;
+    MapDebugOptions debugOptions;
+    TimePoint timePoint;
+    EvaluatedLight light;
+    bool has3D = false;
+    Color backgroundColor;
+    float symbolFadeChange = 0.0f;
+    bool needsRepaint = false;
+    bool loaded = false;
+};
+
+class RenderTree {
+public:
+    virtual ~RenderTree() = default;
+    // Render items
+    virtual RenderItems getLayerRenderItems() const = 0;
+    virtual RenderItems getSourceRenderItems() const = 0;
+    // Resources
+    virtual LineAtlas& getLineAtlas() const = 0;
+    virtual PatternAtlas& getPatternAtlas() const = 0;
+    // Parameters
+    const RenderTreeParameters& getParameters() const {
+        return *parameters;
+    }
+protected:
+    RenderTree(std::unique_ptr<RenderTreeParameters> parameters_)
+        : parameters(std::move(parameters_)) {
+        assert(parameters);
+    }
+    std::unique_ptr<RenderTreeParameters> parameters;
+};
+
+
+} // namespace mbgl