pre double pipeline commit. The following will attempt to add another rendering stage for textured cuboids.

src/vertex.rs

@@ -76,4 +76,75 @@ impl Hash for Vertex {
         self.tex_coord[0].to_bits().hash(state);
         self.tex_coord[1].to_bits().hash(state);
     }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct SizedVertex {
+    pub pos: Vec3,
+    pub color: Vec3,
+    pub tex_coord: Vec2,
+    pub size: Vec3,
+}
+
+impl SizedVertex {
+    pub const fn new(pos: Vec3, color: Vec3, tex_coord: Vec2, size: Vec3) -> Self {
+        Self { pos, color, tex_coord, size }
+    }
+
+    pub fn binding_description() -> vk::VertexInputBindingDescription {
+        vk::VertexInputBindingDescription::builder()
+            .binding(0)
+            .stride(size_of::<Vertex>() as u32)
+            .input_rate(vk::VertexInputRate::VERTEX)
+            .build()
+    }
+
+    pub fn attribute_descriptions() -> [vk::VertexInputAttributeDescription; 3] {
+        let pos = vk::VertexInputAttributeDescription::builder()
+            .binding(0)
+            .location(0)
+            .format(vk::Format::R32G32B32_SFLOAT)
+            .offset(0)
+            .build();
+
+        let color = vk::VertexInputAttributeDescription::builder()
+            .binding(0)
+            .location(1)
+            .format(vk::Format::R32G32B32_SFLOAT)
+            .offset(size_of::<Vec3>() as u32)
+            .build();
+        
+        let tex_coord = vk::VertexInputAttributeDescription::builder()
+            .binding(0)
+            .location(2)
+            .format(vk::Format::R32G32_SFLOAT)
+            .offset((size_of::<Vec3>() + size_of::<Vec3>()) as u32)
+            .build();
+        [pos, color, tex_coord]
+    }
+}
+
+
+impl PartialEq for SizedVertex {
+    fn eq(&self, other: &Self) -> bool {
+        self.pos == other.pos
+            && self.color == other.color
+            && self.tex_coord == other.tex_coord
+    }
+}
+
+impl Eq for SizedVertex {}
+
+impl Hash for SizedVertex {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.pos[0].to_bits().hash(state);
+        self.pos[1].to_bits().hash(state);
+        self.pos[2].to_bits().hash(state);
+        self.color[0].to_bits().hash(state);
+        self.color[1].to_bits().hash(state);
+        self.color[2].to_bits().hash(state);
+        self.tex_coord[0].to_bits().hash(state);
+        self.tex_coord[1].to_bits().hash(state);
+    }
 }