Texture needs to be copied all the Time.

src/main.rs

@@ -1,20 +1,79 @@
-use hello::geometry::Geometry;
-use hello::math::Mat4x4;
+use hello::geometry::{self, Geometry, Sphere};
+use hello::math::{Mat4x4, Point3};
 
-enum SceneGraphNode {
-    Geometry(Mat4x4, Geometry),
-    SubNode(Mat4x4, Box<SceneGraphNode>),
+#[derive(Clone)]
+struct RGB {
+    red: f64,
+    green: f64,
+    blue: f64,
+}
+
+#[derive(Clone)]
+struct Texture {
+    width: usize,
+    height: usize,
+    pixel: Vec<RGB>,
+}
+
+impl Texture {
+    fn load_texture() -> Texture {
+        let width = 640;
+        let height = 480;
+
+        let mut pixel = Vec::new();
+
+        for x in 0..width {
+            for y in 0..height {
+                pixel.push(RGB {
+                    red: 1.0,
+                    green: 1.0,
+                    blue: 1.0,
+                });
+            }
+        }
+
+        Texture {
+            width,
+            height,
+            pixel,
+        }
+    }
+}
+
+struct RenderableGeometry {
+    transform: Mat4x4,
+    geometry: Geometry,
+    texture: Texture,
+}
+
+impl RenderableGeometry {
+    fn new(transform: Mat4x4, geometry: Geometry, texture: Texture) -> RenderableGeometry {
+        RenderableGeometry {
+            transform,
+            geometry,
+            texture,
+        }
+    }
 }
 
 fn main() {
-    let v1 = 5;
-    let v2 = &v1;
-    let v3 = Box::new(v1);
+    let tex = Texture::load_texture();
 
-    println!("v1: {}", v1);
-    println!("v2: {}", v2);
-    println!("v3: {}", v3);
+    let geo1 = RenderableGeometry::new(
+        Mat4x4::ident(),
+        Geometry::Sphere(Sphere::new(Point3::new(0.0, 0.0, 0.0), 1.0)),
+        tex.clone(),
+    );
 
-    assert_eq!(v1, *v2);
-    assert_eq!(v1, *v3);
+    let geo2 = RenderableGeometry::new(
+        Mat4x4::ident(),
+        Geometry::Sphere(Sphere::new(Point3::new(-2.0, 0.0, 0.0), 1.0)),
+        tex.clone(),
+    );
+
+    let geo3 = RenderableGeometry::new(
+        Mat4x4::ident(),
+        Geometry::Sphere(Sphere::new(Point3::new(2.0, 0.0, 0.0), 1.0)),
+        tex.clone(),
+    );
 }

src/math.rs

@@ -94,6 +94,12 @@ pub struct Mat4x4 {
     v: f64,
 }
 
+impl Mat4x4 {
+    pub fn ident() -> Mat4x4 {
+        Mat4x4 { v: 0.0 }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;