various improvements

- added quaternions and rewrote all rotations to use them
- added transforms to put all object transforms in a single place
- added Wavefront .obj file parser
- removed frame buffer's abstract class
- improved vectors, matrices, triangles, vertices and vertices data by putting all code in header file
- added vector's operations
- changed from NULL to nullptr
- miscellaneous improvements

1 files changed, 8 insertions, 6 deletions

diff --git a/src/o3d/deriv_vertex.h b/src/o3d/deriv_vertex.h
index 7524f9b..c435a7e 100644
--- a/src/o3d/deriv_vertex.h
+++ b/src/o3d/deriv_vertex.h
@@ -5,13 +5,15 @@
 
 namespace engine::o3d {
 
-class DerivedVertex {
-    public:
-        engine::math::Vector4 vertex;
-        float b0, b1;
+using engine::math::Vector4;
 
-        DerivedVertex(engine::math::Vector4 vertex, float b0, float b1);
-        DerivedVertex div_by_w() const;
+struct DerivedVertex {
+    Vector4 vertex;
+    float b0, b1;
+
+    constexpr DerivedVertex div_by_w() const & {
+        return {vertex.div_by_w(), b0, b1};
+    }
 };
 
 }