1 files changed, 47 insertions, 0 deletions
diff --git a/src/mbgl/style/layers/terrain_layer_impl.cpp b/src/mbgl/style/layers/terrain_layer_impl.cpp
new file mode 100644
index 000000000..79e41fa93
--- /dev/null
+++ b/src/mbgl/style/layers/terrain_layer_impl.cpp
@@ -0,0 +1,47 @@
+#include <mbgl/style/layers/terrain_layer_impl.hpp>
+#include <mbgl/style/geometry_bucket_parameters.hpp>
+#include <mbgl/style/raster_bucket_parameters.hpp>
+#include <mbgl/renderer/terrain_bucket.hpp>
+
+namespace mbgl {
+namespace style {
+
+void TerrainLayer::Impl::cascade(const CascadeParameters& parameters) {
+    paint.cascade(parameters);
+}
+
+bool TerrainLayer::Impl::recalculate(const CalculationParameters& parameters) {
+    bool hasTransitions = paint.recalculate(parameters);
+
+    passes = RenderPass::Translucent;
+
+    return hasTransitions;
+}
+
+std::unique_ptr<Bucket> TerrainLayer::Impl::createBucket(BucketParameters& params) const {
+    if (params.is<mapbox::util::recursive_wrapper<GeometryBucketParameters>>()) {
+        // DEM data encoded into vector tile
+        auto& parameters = params.get<GeometryBucketParameters>();
+        auto& layer = parameters.layer;
+
+        for (std::size_t i = 0; !parameters.cancelled() && i < layer.featureCount(); i++) {
+            auto feature = layer.getFeature(i);
+            if (feature->getType() == FeatureType(4)) {
+                return std::make_unique<TerrainBucket>(feature->getDEMPyramid());
+            } else {
+                // Trying to create a DEM from another feature type.
+            }
+        }
+    } else if (params.is<mapbox::util::recursive_wrapper<RasterBucketParameters>>()) {
+        // DEM data from raster tile
+        auto& parameters = params.get<RasterBucketParameters>();
+        if (parameters.data) {
+            return std::make_unique<TerrainBucket>(decodeImage(*parameters.data));
+        }
+    }
+
+    return nullptr;
+}
+
+} // namespace style
+} // namespace mbgl