allocate and use a vertex buffer

kinda cool how the driver interfaces with the kernel to map memory on our behalf

Force-Push: yes
Change-Id: I906f68b59dcedc1fd6d9bfc52c9b299abc9cd828

1 files changed, 62 insertions, 0 deletions

diff --git a/src/linear_algebra.rs b/src/linear_algebra.rs
new file mode 100644
index 0000000..950877b
--- /dev/null
+++ b/src/linear_algebra.rs
@@ -0,0 +1,62 @@
+#![forbid(unsafe_code)]
+use std::mem::size_of;
+use vulkanalia::vk::{ self, HasBuilder };
+
+
+pub static VERTICES: [Vertex<f32>; 3] = [
+  Vertex::new(Vec2( 0.0, -0.5), Vec3(1.0, 0.0, 0.0)),
+  Vertex::new(Vec2( 0.5,  0.5), Vec3(0.0, 1.0, 0.0)),
+  Vertex::new(Vec2(-0.5,  0.5), Vec3(0.0, 0.0, 1.0)),
+];
+
+
+#[derive(Clone, Debug)]
+pub struct Vec2<T>(T, T);
+#[derive(Clone, Debug)]
+pub struct Vec3<T>(T, T, T);
+#[derive(Clone, Debug)]
+#[allow(unused)]
+pub struct Vec4<T>(T, T, T, T);
+
+
+#[repr(C)]
+#[derive(Clone, Debug)]
+pub struct Vertex<T> {
+  pub position: Vec2<T>,
+  pub color: Vec3<T>,
+}
+
+impl<T> Vertex<T> {
+  const fn new(position: Vec2<T>, color: Vec3<T>) -> Self {
+    Self { position, color }
+  }
+
+  pub fn binding_description() -> vk::VertexInputBindingDescription {
+    vk::VertexInputBindingDescription::builder()
+        .binding(0)
+        .stride(size_of::<Vertex<f32>>() as u32)
+        .input_rate(vk::VertexInputRate::VERTEX)
+        .build()
+  }
+
+  pub fn attribute_descriptions()
+      -> [vk::VertexInputAttributeDescription; 2]
+  {
+    let position = 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<f32>>() as u32)
+                       .build();
+
+    [position, color]
+  }
+}
+