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, 10 insertions, 9 deletions

diff --git a/src/o3d/tri_deriv.h b/src/o3d/tri_deriv.h
index 201539b..16a21f8 100644
--- a/src/o3d/tri_deriv.h
+++ b/src/o3d/tri_deriv.h
@@ -7,16 +7,17 @@
 
 namespace engine::o3d {
 
-class TriangleDerived {
-    public:
-        DerivedVertex derived_vertex1;
-        DerivedVertex derived_vertex2;
-        DerivedVertex derived_vertex3;
+struct TriangleDerived {
+    DerivedVertex derived_vertex1;
+    DerivedVertex derived_vertex2;
+    DerivedVertex derived_vertex3;
 
-        TriangleDerived(DerivedVertex derived_vertex1, DerivedVertex derived_vertex2, DerivedVertex derived_vertex3);
-        std::vector<TriangleDerived> perspective_crop_xy_out(float x1, float x2, float y1, float y2) const;
-        std::vector<TriangleDerived> crop_z_out(float z1, float z2) const;
-        TriangleDerived div_by_w() const;
+    std::vector<TriangleDerived> perspective_crop_xy_out(float x1, float x2, float y1, float y2) const;
+    std::vector<TriangleDerived> crop_z_out(float z1, float z2) const;
+
+    constexpr TriangleDerived div_by_w() const & {
+        return {derived_vertex1.div_by_w(), derived_vertex2.div_by_w(), derived_vertex3.div_by_w()};
+    }
 };
 
 }