Added Matrix identity macros and few matrix unit tests (#742)

* Add matrix identity macros

* Add matrix some matrix unit tests

---------

Co-authored-by: Tonis <tanton@paysure.solutions>

lib/std/math/math.c3

@@ -105,6 +105,9 @@ define matrix4_ortho = matrix::ortho<double>;
 define matrix4_perspective = matrix::perspective<double>;
 define matrix4f_ortho = matrix::ortho<float>;
 define matrix4f_perspective = matrix::perspective<float>;
+macro Matrix4 matrix4_indentity() => { .m = { [0] = 1, [5] = 1, [10] = 1, [15] = 1 } };
+macro Matrix3 matrix3_indentity() => { .m = { [0] = 1, [4] = 1, [8] = 1 } };
+macro Matrix2 matrix2_indentity() => { .m = { [0] = 1, [3] = 1 } };
 
 /**
  * @require types::is_numerical($typeof(x)) `The input must be a numerical value or numerical vector`

test/unit/stdlib/math/matrix.c3

@@ -0,0 +1,50 @@
+module math_matrix @test;
+import std::math;
+
+fn void test_mat4()
+{
+	{|
+		Matrix4 mat = math::matrix4_indentity();
+		Matrix4 mat2 = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 };
+		Matrix4 calc = mat.mul(mat2);
+		assert(calc.m == mat.m);
+
+		Matrix4 translated = mat.translate(Vec3{0.0, 0.0, 0.0});
+		assert(translated.m == mat.m);
+	|};
+
+	{|
+		Matrix4 mat = { 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8 };
+		Matrix4 mat2 = { 8, 7, 6, 5, 4, 3, 2, 1, 8, 7, 6, 5, 4, 3, 2, 1 };
+		Matrix4 calc = mat.mul(mat2);
+		Matrix4 value = { 56, 46, 36, 26, 152, 126, 100, 74, 56, 46, 36, 26, 152, 126, 100, 74 };
+		assert(calc.m == value.m);
+	|};
+}
+
+
+fn void test_mat3()
+{
+		Matrix3 mat = { 3, 5, 3, 5, 2, 6, 6, 2, 1 };
+		Matrix3 mat2 = { 4, 2, 6, 7, 8, 9, 2, 3, 4 };
+		Matrix3 calc = mat.mul(mat2);
+		Matrix3 value = { 53, 55, 75, 46, 44, 72, 40, 31, 58 };
+
+		assert(calc.m == value.m);
+}
+
+fn void test_mat2()
+{
+		Matrix2 mat = { 3, 5, 5, 2};
+		Matrix2 mat2 = { 4, 2, 7, 8 };
+		Matrix2 calc = mat.mul(mat2);
+		Matrix2 value = { 47, 46, 34, 26 };
+
+		assert(calc.m == value.m);
+}
+
+fn void test_vec3()
+{
+	Vec3 cross = Vec3{2,3,4}.cross(Vec3{5,6,7});
+	assert(cross == Vec3{-3,6,-3});
+}