makes geometry shader an option

src/primitives/cube.rs

@@ -0,0 +1,130 @@
+use vulkanalia::prelude::v1_0::*;
+use cgmath::{vec2, vec3, Matrix, SquareMatrix};
+use crate::vertex;
+use crate::scene::Scene;
+
+#[derive(Clone, Debug)]
+pub struct Cube{
+    pub pos: vertex::Vec3,
+    pub color: vertex::Vec3,
+    pub tex_coord: vertex::Vec2
+}
+
+impl Cube {
+    pub fn draw(& self, topology: &vk::PrimitiveTopology, start_index: usize, scene: &mut Scene) {
+        if *topology == vk::PrimitiveTopology::TRIANGLE_LIST {
+            // 0 top left far
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 - 0.5, self.pos.y as f32 + 0.5, self.pos.z as f32 + 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 1 top right far
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 + 0.5, self.pos.y as f32 + 0.5, self.pos.z as f32 + 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 2 top left near
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 - 0.5, self.pos.y as f32 - 0.5, self.pos.z as f32 + 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 3 top right near
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 + 0.5, self.pos.y as f32 - 0.5, self.pos.z as f32 + 0.5),
+                self.color,
+                self.tex_coord
+            ));
+
+            // 4 bottom left far
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 - 0.5, self.pos.y as f32 + 0.5, self.pos.z as f32 - 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 5 bottom right far
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 + 0.5, self.pos.y as f32 + 0.5, self.pos.z as f32 - 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 6 bottom left near
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 - 0.5, self.pos.y as f32 - 0.5, self.pos.z as f32 - 0.5),
+                self.color,
+                self.tex_coord
+            ));
+            // 7 bottom right near
+            scene.vertices.push(vertex::Vertex::new(
+                vec3(self.pos.x as f32 + 0.5, self.pos.y as f32 - 0.5, self.pos.z as f32 - 0.5),
+                self.color,
+                self.tex_coord
+            ));
+
+            
+            // top
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 0);
+            scene.indices.push(start_index as u32 + 2);
+
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 1);
+            scene.indices.push(start_index as u32 + 0);
+
+            // bottom
+            scene.indices.push(start_index as u32 + 6);
+            scene.indices.push(start_index as u32 + 4);
+            scene.indices.push(start_index as u32 + 7);
+            
+            scene.indices.push(start_index as u32 + 4);
+            scene.indices.push(start_index as u32 + 5);
+            scene.indices.push(start_index as u32 + 7);
+
+            // left
+            scene.indices.push(start_index as u32 + 0);
+            scene.indices.push(start_index as u32 + 4);
+            scene.indices.push(start_index as u32 + 2);
+            
+            scene.indices.push(start_index as u32 + 6);
+            scene.indices.push(start_index as u32 + 2);
+            scene.indices.push(start_index as u32 + 4);
+
+            // right
+            scene.indices.push(start_index as u32 + 1);
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 5);
+            
+            scene.indices.push(start_index as u32 + 5);
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 7);
+
+            // near
+            scene.indices.push(start_index as u32 + 6);
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 2);
+            
+            scene.indices.push(start_index as u32 + 3);
+            scene.indices.push(start_index as u32 + 6);
+            scene.indices.push(start_index as u32 + 7);
+
+            // far
+            scene.indices.push(start_index as u32 + 0);
+            scene.indices.push(start_index as u32 + 1);
+            scene.indices.push(start_index as u32 + 4);
+            
+            scene.indices.push(start_index as u32 + 5);
+            scene.indices.push(start_index as u32 + 4);
+            scene.indices.push(start_index as u32 + 1);
+        }
+        if *topology == vk::PrimitiveTopology::POINT_LIST {
+            scene.vertices.push(vertex::Vertex::new(
+                self.pos,
+                self.color,
+                self.tex_coord
+            ));
+            scene.indices.push(start_index as u32);
+        }
+    }
+}