feat(engine): add basic flat lighting

1 files changed, 19 insertions, 1 deletions

diff --git a/engine/src/vertex.rs b/engine/src/vertex.rs
index 9df646f..bb0e890 100644
--- a/engine/src/vertex.rs
+++ b/engine/src/vertex.rs
@@ -10,6 +10,7 @@ pub struct Vertex
     pos: Vec3<f32>,
     color: Color<f32>,
     texture_coords: Vec2<f32>,
+    normal: Vec3<f32>,
 }
 
 #[derive(Debug, Default)]
@@ -18,6 +19,7 @@ pub struct Builder
     pos: Option<Vec3<f32>>,
     color: Option<Color<f32>>,
     texture_coords: Vec2<f32>,
+    normal: Option<Vec3<f32>>,
 }
 
 impl Builder
@@ -53,15 +55,25 @@ impl Builder
     }
 
     #[must_use]
+    pub fn normal(mut self, normal: Vec3<f32>) -> Self
+    {
+        self.normal = Some(normal);
+
+        self
+    }
+
+    #[must_use]
     pub fn build(self) -> Option<Vertex>
     {
         let pos = self.pos?;
-        let color = self.color?;
+        let color = self.color.unwrap_or_default();
+        let normal = self.normal.unwrap_or_default();
 
         Some(Vertex {
             pos,
             color,
             texture_coords: self.texture_coords,
+            normal,
         })
     }
 }
@@ -89,6 +101,12 @@ impl Vertex
                 component_cnt: AttributeComponentCnt::Two,
                 component_size: size_of::<f32>(),
             },
+            Attribute {
+                index: 3,
+                component_type: AttributeComponentType::Float,
+                component_cnt: AttributeComponentCnt::Three,
+                component_size: size_of::<f32>(),
+            },
         ]
     }
 }