[core, ios, macos, android, node] Heatmap layer (#11046)

Co-Authored-By: Konstantin Käfer <mail@kkaefer.com>
Co-Authored-By: Anand Thakker <anandthakker@users.noreply.github.com>
Co-Authored-By: Minh Nguyễn <1ec5@users.noreply.github.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/mbgl/renderer/layers/render_heatmap_layer.hpp b/src/mbgl/renderer/layers/render_heatmap_layer.hpp
new file mode 100644
index 0000000000..3f0b1f91b4
--- /dev/null
+++ b/src/mbgl/renderer/layers/render_heatmap_layer.hpp
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <mbgl/renderer/render_layer.hpp>
+#include <mbgl/style/layers/heatmap_layer_impl.hpp>
+#include <mbgl/style/layers/heatmap_layer_properties.hpp>
+#include <mbgl/util/optional.hpp>
+#include <mbgl/util/offscreen_texture.hpp>
+
+namespace mbgl {
+
+class RenderHeatmapLayer: public RenderLayer {
+public:
+    RenderHeatmapLayer(Immutable<style::HeatmapLayer::Impl>);
+    ~RenderHeatmapLayer() final = default;
+
+    void transition(const TransitionParameters&) override;
+    void evaluate(const PropertyEvaluationParameters&) override;
+    bool hasTransition() const override;
+    void render(PaintParameters&, RenderSource*) override;
+
+    bool queryIntersectsFeature(
+            const GeometryCoordinates&,
+            const GeometryTileFeature&,
+            const float,
+            const float,
+            const float) const override;
+
+    void updateColorRamp();
+
+    std::unique_ptr<Bucket> createBucket(const BucketParameters&, const std::vector<const RenderLayer*>&) const override;
+
+    // Paint properties
+    style::HeatmapPaintProperties::Unevaluated unevaluated;
+    style::HeatmapPaintProperties::PossiblyEvaluated evaluated;
+
+    const style::HeatmapLayer::Impl& impl() const;
+
+    PremultipliedImage colorRamp;
+    optional<OffscreenTexture> renderTexture;
+    optional<gl::Texture> colorRampTexture;
+};
+
+template <>
+inline bool RenderLayer::is<RenderHeatmapLayer>() const {
+    return type == style::LayerType::Heatmap;
+}
+
+} // namespace mbgl