halfway to raytracing

src/scene/light.rs

@@ -0,0 +1,34 @@
+use cgmath::{InnerSpace, MetricSpace, Vector3};
+
+use crate::vertex;
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct PointLight{
+    pub pos: vertex::Vec3,
+    pub color: vertex::Vec3,
+    pub memory_start: usize,
+}
+
+impl PointLight {
+    pub fn get_buffer_mem_size(&self) -> u32 {
+        4 * 3 + 4 * 3
+    }
+
+    pub fn insert_into_memory(&self, mut v: Vec<u32>) -> Vec<u32> { 
+        v[self.memory_start] = self.pos.x as u32;
+        v[self.memory_start + 1] = self.pos.y as u32;
+        v[self.memory_start + 2] = self.pos.z as u32;
+
+        v[self.memory_start + 3] = self.color.x as u32;
+        v[self.memory_start + 4] = self.color.y as u32;
+        v[self.memory_start + 5] = self.color.z as u32;
+        v
+    }
+
+    pub fn weighted_distance(&self, center: Vector3<usize>) -> f32 {
+        let distance = self.pos.distance(vertex::Vec3{x: center.x as f32, y: center.y as f32, z: center.z as f32});
+        let light_intensity = self.color.magnitude();
+
+        light_intensity / distance.powf(2.0)        
+    }
+}