Update GLM to latest version (0.9.9.3). This includes GLM's change of matrices no longer default initializing to the identity matrix. This commit thus also includes the update of all of LearnOpenGL's code to reflect this: all matrices are now constructor-initialized to the identity matrix where relevant.

includes/glm/ext/vector_int1_precision.hpp

@@ -0,0 +1,34 @@
+/// @ref ext_vector_int1_precision
+/// @file glm/ext/vector_int1_precision.hpp
+///
+/// @defgroup ext_vector_int1_precision GLM_EXT_vector_int1_precision
+/// @ingroup ext
+///
+/// Exposes highp_ivec1, mediump_ivec1 and lowp_ivec1 types.
+///
+/// Include <glm/ext/vector_int1_precision.hpp> to use the features of this extension.
+
+#pragma once
+
+#include "../detail/type_vec1.hpp"
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_EXT_vector_int1_precision extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup ext_vector_int1_precision
+	/// @{
+
+	/// 1 component vector of signed integer values.
+	typedef vec<1, int, highp>			highp_ivec1;
+
+	/// 1 component vector of signed integer values.
+	typedef vec<1, int, mediump>		mediump_ivec1;
+
+	/// 1 component vector of signed integer values.
+	typedef vec<1, int, lowp>			lowp_ivec1;
+
+	/// @}
+}//namespace glm