moved Mat4 definition

include/Defines.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <cstdint>
+
 namespace td {
 
 template<typename T>
@@ -95,4 +97,34 @@ using Vec4d = Vec4<double>;
 
 using Color = Vec3<unsigned char>;
 
+template<typename T>
+struct Mat4 {
+	static const std::size_t MATRIX_SIZE = 4;
+
+	T x0, x1, x2, x3;
+	T y0, y1, y2, y3;
+	T z0, z1, z2, z3;
+	T w0, w1, w2, w3;
+
+	T operator[] (std::size_t offset) const {
+		return reinterpret_cast<const T*>(this)[offset];
+	}
+
+	T& operator[] (std::size_t offset) {
+		return reinterpret_cast<T*>(this)[offset];
+	}
+
+	T at(std::size_t row, std::size_t column) const {
+		return operator[](row * MATRIX_SIZE + column);
+	}
+
+	T& at(std::size_t row, std::size_t column) {
+		return operator[](row * MATRIX_SIZE + column);
+	}
+};
+
+typedef Mat4<float> Mat4f;
+typedef Mat4<int> Mat4i;
+typedef Mat4<double> Mat4d;
+
 } // namespace td