[core] allow changing the orientation

You can now change the orientation of north to be to the right, bottom, left in addition to the default of top

2 files changed, 9 insertions, 0 deletions

diff --git a/include/mbgl/util/geo.hpp b/include/mbgl/util/geo.hpp
index 2f0e4f6fdc..e815456f22 100644
--- a/include/mbgl/util/geo.hpp
+++ b/include/mbgl/util/geo.hpp
@@ -100,6 +100,14 @@ struct MetersBounds {
     }
 };
 
+// Determines the orientation of the map.
+enum class NorthOrientation : uint8_t {
+    Upwards, // Default
+    Rightwards,
+    Downwards,
+    Leftwards,
+};
+
 } // namespace mbgl
 
 #endif
diff --git a/include/mbgl/util/mat4.hpp b/include/mbgl/util/mat4.hpp
index e5b508e547..59f6e3ee00 100644
--- a/include/mbgl/util/mat4.hpp
+++ b/include/mbgl/util/mat4.hpp
@@ -38,6 +38,7 @@ void perspective(mat4& out, double fovy, double aspect, double near, double far)
 void copy(mat4& out, const mat4& a);
 void translate(mat4& out, const mat4& a, double x, double y, double z);
 void rotate_x(mat4& out, const mat4& a, double rad);
+void rotate_y(mat4& out, const mat4& a, double rad);
 void rotate_z(mat4& out, const mat4& a, double rad);
 void scale(mat4& out, const mat4& a, double x, double y, double z);
 void multiply(mat4& out, const mat4& a, const mat4& b);