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#pragma once
#include <mbgl/renderer/render_pass.hpp>
#include <mbgl/style/layer_impl.hpp>
#include <mbgl/style/layer_type.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
#include <memory>
#include <string>
namespace mbgl {
class Bucket;
class BucketParameters;
class CascadeParameters;
class PropertyEvaluationParameters;
class RenderLayer {
protected:
RenderLayer(style::LayerType, const style::Layer::Impl&);
const style::LayerType type;
public:
virtual ~RenderLayer() = default;
// Create an identical copy of this layer.
virtual std::unique_ptr<RenderLayer> clone() const = 0;
// Partially evaluate paint properties based on a set of classes.
virtual void cascade(const CascadeParameters&) = 0;
// Fully evaluate cascaded paint properties based on a zoom level.
// Returns true if any paint properties have active transitions.
virtual bool evaluate(const PropertyEvaluationParameters&) = 0;
// Check whether this layer is of the given subtype.
template <class T>
bool is() const;
// Dynamically cast this layer to the given subtype.
template <class T>
T* as() {
return is<T>() ? reinterpret_cast<T*>(this) : nullptr;
}
template <class T>
const T* as() const {
return is<T>() ? reinterpret_cast<const T*>(this) : nullptr;
}
const std::string& getID() const;
// Checks whether this layer needs to be rendered in the given render pass.
bool hasRenderPass(RenderPass) const;
// Checks whether this layer can be rendered.
bool needsRendering(float zoom) const;
// Check wether the given geometry intersects
// with the feature
virtual bool queryIntersectsFeature(
const GeometryCoordinates&,
const GeometryTileFeature&,
const float,
const float,
const float) const { return false; };
virtual std::unique_ptr<Bucket> createBucket(const BucketParameters&, const std::vector<const RenderLayer*>&) const = 0;
// Private implementation
const style::Layer::Impl& baseImpl;
friend std::string layoutKey(const RenderLayer&);
protected:
// Stores what render passes this layer is currently enabled for. This depends on the
// evaluated StyleProperties object and is updated accordingly.
RenderPass passes = RenderPass::None;
};
} // namespace mbgl
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