rewrote entirely the triangle clipping algorithm

There is still a lot of work needed to refactor it properly.

- use the Sutherland–Hodgman algorithm, with some minor changes
- made clipping more general, allowing clipping of any coordinate,
  before and after division by w
- compute the z coordinate only at the fragment stage instead of each
  time clipping creates / moves a vertex, in addition to the fragment
  stage
- added VectorCoords to choose at compile-time different coordinates
  based on a template argument
- added transpose struct to allow shuffling of vectors coordinates
- added math::utils::lerp which interpolate linearly a float
- added Vector{2,3,4}::map() which maps a vector from one range to
  another
- added template parameter to DerivedVertex (and therefore
  TriangleDerived) to allow choosing which dimension to use

1 files changed, 2 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index e8f98a1..f7741a6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -22,7 +22,8 @@ engine_SOURCES = \
 	o3d/vertex.hpp \
 	o3d/deriv_vertex.hpp \
 	o3d/tri.hpp \
-	o3d/tri_deriv.hpp o3d/tri_deriv.cpp \
+	o3d/tri_deriv.hpp \
+	o3d/polygon.hpp \
 	o3d/camera.hpp \
 	o3d/scene.hpp \
 	ctrl/keyboard.hpp \