Add basic gradient sky dome

Cargo.toml

@@ -24,7 +24,8 @@ path = "utils/terrain/main.rs"
 required-features = ["terrain"]
 
 [features]
-default = ["terrain"]
+default = ["terrain", "skydome"]
+skydome = []
 terrain = [
     "dep:noise",
     "dep:rand",

README.md

@@ -39,6 +39,10 @@ glslc -fshader-stage=vertex src/models/shaders/skin_mesh.vert -o src/models/shad
 glslc -fshader-stage=fragment src/models/shaders/skin_mesh.frag -o src/models/shaders/skin_mesh.frag.spv
 glslc -fshader-stage=vertex src/features/terrain/shaders/terrain.vert -o src/features/terrain/shaders/terrain.vert.spv
 glslc -fshader-stage=fragment src/features/terrain/shaders/terrain.frag -o src/features/terrain/shaders/terrain.frag.spv
+glslc -fshader-stage=vertex src/features/skydome/shaders/skydome.vert -o src/features/skydome/shaders/skydome.vert.spv
+glslc -fshader-stage=fragment src/features/skydome/shaders/skydome.frag -o src/features/skydome/shaders/skydome.frag.spv
+```
+
 ```
 
 ## Sponsors

src/features.rs

@@ -1,2 +1,5 @@
+#[cfg(feature = "skydome")]
+pub mod skydome;
+
 #[cfg(feature = "terrain")]
 pub mod terrain;

src/features/skydome.rs

@@ -0,0 +1,53 @@
+mod renderer;
+
+use crate::math::{Quat, Vec3};
+use crate::models::Transform3D;
+use crate::{Color, Mesh};
+
+pub use renderer::RenderSkyDome;
+
+pub struct SkyDome {
+    /// horizon color
+    pub horizon_color: Color<f32>,
+    /// zenit color
+    pub zenith_color: Color<f32>,
+    /// Mesh
+    pub mesh: Mesh,
+    /// Mesh transformation
+    pub transform: Transform3D,
+    /// Size
+    pub size: f32,
+}
+
+pub struct SkyLevel {
+    /// Sky color
+    pub color: Color<f32>,
+    /// Level where the color starts
+    pub level: f32,
+}
+
+impl SkyDome {
+    pub fn new(size: f32, horizon_color: Color<f32>, zenith_color: Color<f32>) -> Self {
+        let mesh = Mesh::hemisphere("Hemisphere", 64, 32);
+        let transform = Transform3D {
+            scale: Vec3::new(size, size, size),
+            translate: Vec3::new(0.0, -100.0, 0.0),
+            rotate: Quat::from_axis_angle(Vec3::new(1.0, 0.0, 0.0), -(std::f32::consts::PI / 2.0)),
+        };
+        Self {
+            mesh,
+            transform,
+            size,
+            horizon_color,
+            zenith_color,
+        }
+    }
+}
+
+impl Default for SkyDome {
+    fn default() -> Self {
+        let horizon_color = Color::rgba(0.67, 0.855, 0.905, 1.0);
+        let zenith_color = Color::rgba(0.0, 0.44, 0.75, 1.0);
+        Self::new(800.0, horizon_color, zenith_color)
+    }
+}