From f6e79d70735361438655f279c8699a786d25458c Mon Sep 17 00:00:00 2001
From: Lauren Budorick <lauren@mapbox.com>
Date: Thu, 27 Apr 2017 15:56:55 -0700
Subject: [core] Render fill-extrusion layers (#8431)

---
 include/mbgl/util/interpolate.hpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'include/mbgl/util/interpolate.hpp')

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>
@@ -46,6 +47,17 @@ 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:
-- 
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