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-rw-r--r--include/mbgl/util/mat4.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/mbgl/util/mat4.hpp b/include/mbgl/util/mat4.hpp
index ea4854306c..9c34332400 100644
--- a/include/mbgl/util/mat4.hpp
+++ b/include/mbgl/util/mat4.hpp
@@ -32,6 +32,7 @@ typedef std::array<double, 16> mat4;
namespace matrix {
void identity(mat4& out);
+bool invert(mat4& out, mat4& a);
void ortho(mat4& out, double left, double right, double bottom, double top, double near, double far);
void perspective(mat4& out, double fovy, double aspect, double near, double far);
void copy(mat4& out, const mat4& a);