Create orthographic projection function

linear_alg.c

@@ -100,6 +100,16 @@ mat4_t mat4_perspective(float aspect, float fov, float near, float far)
 	};
 }
 
+mat4_t mat4_orthographic(float width, float height, float near, float far)
+{
+	return (mat4_t) {
+		{ 1 / width, 0, 0, 0 },
+		{ 0, -1 / height, 0, 0 },
+		{ 0, 0, 1 / (far - near), 0 },
+		{ 0, 0, -near / (far - near), 1 },
+	};
+}
+
 mat4_t mat4_translate_vec3(vec3_t v)
 {
 	return (mat4_t) {