1 files changed, 49 insertions, 0 deletions
diff --git a/src/maths.h b/src/maths.h
new file mode 100644
index 0000000..d50f285
--- /dev/null
+++ b/src/maths.h
@@ -0,0 +1,49 @@
+#ifndef VGLTF_MATHS_H
+#define VGLTF_MATHS_H
+
+typedef float vgltf_vec_value_type;
+
+constexpr double VGLTF_MATHS_PI = 3.14159265358979323846;
+#define VGLTF_MATHS_DEG_TO_RAD(deg) (deg * VGLTF_MATHS_PI / 180.0)
+#define VGLTF_MAX(x, y) ((x) > (y) ? (x) : (y))
+
+typedef struct {
+  vgltf_vec_value_type x;
+  vgltf_vec_value_type y;
+} vgltf_vec2;
+
+typedef struct {
+  vgltf_vec_value_type x;
+  vgltf_vec_value_type y;
+  vgltf_vec_value_type z;
+} vgltf_vec3;
+vgltf_vec3 vgltf_vec3_sub(vgltf_vec3 lhs, vgltf_vec3 rhs);
+vgltf_vec3 vgltf_vec3_cross(vgltf_vec3 lhs, vgltf_vec3 rhs);
+vgltf_vec_value_type vgltf_vec3_dot(vgltf_vec3 lhs, vgltf_vec3 rhs);
+
+vgltf_vec_value_type vgltf_vec3_length(vgltf_vec3 vec);
+vgltf_vec3 vgltf_vec3_normalized(vgltf_vec3 vec);
+
+typedef vgltf_vec_value_type vgltf_mat_value_type;
+
+// row major
+typedef vgltf_mat_value_type vgltf_mat4[16];
+void vgltf_mat4_multiply(vgltf_mat4 out, vgltf_mat4 lhs, vgltf_mat4 rhs);
+void vgltf_mat4_rotate(vgltf_mat4 out, vgltf_mat4 matrix,
+                     vgltf_mat_value_type angle_radians, vgltf_vec3 axis);
+void vgltf_mat4_look_at(vgltf_mat4 out, vgltf_vec3 eye_position,
+                      vgltf_vec3 target_position, vgltf_vec3 up_axis);
+void vgltf_mat4_perspective(vgltf_mat4 out, vgltf_mat_value_type fov,
+                          vgltf_mat_value_type aspect_ratio,
+                          vgltf_mat_value_type near, vgltf_mat_value_type far);
+
+// clang-format off
+#define VGLTF_MAT4_IDENTITY { \
+  1, 0, 0, 0, \
+  0, 1, 0, 0, \
+  0, 0, 1, 0, \
+  0, 0, 0, 1, \
+}
+// clang-format on
+
+#endif // VGLTF_MATHS_H