pre vertex transfer buffer

src/vertex.rs

@@ -0,0 +1,46 @@
+use vulkanalia::prelude::v1_0::*;
+
+use std::mem::size_of;
+
+use cgmath;
+
+type Vec2 = cgmath::Vector2<f32>;
+type Vec3 = cgmath::Vector3<f32>;
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct Vertex {
+    pub pos: Vec2,
+    pub color: Vec3,
+}
+
+impl Vertex {
+    pub const fn new(pos: Vec2, color: Vec3) -> Self {
+        Self { pos, color }
+    }
+
+    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; 2] {
+        let pos = vk::VertexInputAttributeDescription::builder()
+            .binding(0)
+            .location(0)
+            .format(vk::Format::R32G32_SFLOAT)
+            .offset(0)
+            .build();
+
+        let color = vk::VertexInputAttributeDescription::builder()
+            .binding(0)
+            .location(1)
+            .format(vk::Format::R32G32B32_SFLOAT)
+            .offset(size_of::<Vec2>() as u32)
+            .build();
+        [pos, color]
+    }
+}