[core] Render fill-extrusion layers (#8431)

1 files changed, 12 insertions, 0 deletions

diff --git a/include/mbgl/util/interpolate.hpp b/include/mbgl/util/interpolate.hpp
index d463ffc056..a2103f18b2 100644
--- a/include/mbgl/util/interpolate.hpp
+++ b/include/mbgl/util/interpolate.hpp
@@ -2,6 +2,7 @@
 
 #include <mbgl/util/color.hpp>
 #include <mbgl/util/range.hpp>
+#include <mbgl/style/position.hpp>
 
 #include <array>
 #include <vector>
@@ -47,6 +48,17 @@ public:
 };
 
 template <>
+struct Interpolator<style::Position> {
+public:
+    style::Position operator()(const style::Position& a, const style::Position& b, const double t) {
+        auto pos = style::Position();
+        auto interpolated = interpolate(a.getCartesian(), b.getCartesian(), t);
+        pos.setCartesian(interpolated);
+        return { pos };
+    }
+};
+
+template <>
 struct Interpolator<Color> {
 public:
     Color operator()(const Color& a, const Color& b, const double t) {