From 175c71637b6bea6dcdd0faf3d614339983809bb1 Mon Sep 17 00:00:00 2001
From: vimene <vincent.menegaux@gmail.com>
Date: Thu, 15 Jan 2026 05:15:59 +0100
Subject: rewrote entirely the triangle clipping algorithm
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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
---
 src/o3d/tri.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/o3d/tri.hpp')

diff --git a/src/o3d/tri.hpp b/src/o3d/tri.hpp
index 712c135..56ff1dd 100644
--- a/src/o3d/tri.hpp
+++ b/src/o3d/tri.hpp
@@ -12,8 +12,8 @@ struct Triangle {
     Vertex vertex2;
     Vertex vertex3;
 
-    constexpr TriangleDerived to_derived() const & {
-        return {{vertex1.vertex, 1.f, 0.f}, {vertex2.vertex, 0.f, 1.f}, {vertex3.vertex, 0.f, 0.f}};
+    constexpr TriangleDerived<engine::math::Vector4> to_derived() const & {
+        return { { vertex1.vertex, 1.f, 0.f }, { vertex2.vertex, 0.f, 1.f }, { vertex3.vertex, 0.f, 0.f } };
     }
 };
 
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