[add] vertex buffer & mesh structs for implementing meshes.

Author: vmarcella

crates/lambda-platform/src/vertex.rs

@@ -123,7 +123,7 @@ impl Component for PushConstantsExample {
 
     // Create a projection matrix.
     let mut projection: [[f32; 4]; 4] =
-      matrix::perspective_matrix(1.0 / 2.0, 1700.0 / 900.0, 0.1, 200.0);
+      matrix::perspective_matrix(0.25, 1700.0 / 900.0, 0.1, 200.0);
     projection.as_mut()[1].as_mut()[1] *= -1.0;
 
     // Rotate model.

lambda/examples/push_constants.rs

@@ -0,0 +1,6 @@
+use super::vertex::Vertex;
+
+pub struct Mesh {
+  pub vertices: Vec<Vertex>,
+  pub indices: Vec<u32>,
+}

lambda/src/core/render/mesh.rs

@@ -1,10 +1,13 @@
 //! High level Rendering API designed for cross platform rendering and
 //! windowing.
 
+// Module Exports
 pub mod command;
+pub mod mesh;
 pub mod pipeline;
 pub mod render_pass;
 pub mod shader;
+pub mod vertex;
 pub mod viewport;
 pub mod window;
 

lambda/src/core/render/mod.rs

@@ -0,0 +1,6 @@
+#[derive(Clone, Copy, Debug)]
+pub struct Vertex {
+  pub position: [f32; 3],
+  pub normal: [f32; 3],
+  pub color: [f32; 3],
+}

lambda/src/core/render/vertex.rs

@@ -3,12 +3,19 @@
 pub mod matrix;
 pub mod vector;
 
+pub enum Angle {
+  Radians(f32),
+  Degrees(f32),
+  Turns(f32),
+}
+
 /// Convert a turn into radians.
 fn turns_to_radians(turns: f32) -> f32 {
   return turns * std::f32::consts::PI * 2.0;
 }
 
 #[macro_export]
+/// Assert that two values are equal, with a given tolerance.
 macro_rules! assert_approximately_equal {
   ($a:expr, $b:expr, $eps:expr) => {{
     let (a, b, eps) = ($a, $b, $eps);