Add basic lighting

src/res.rs

@@ -1,9 +1,14 @@
-use sfml::{audio::Music, graphics::Texture, SfBox};
+use sfml::{
+    audio::Music,
+    graphics::{Shader, ShaderType, Texture},
+    SfBox,
+};
 
 pub struct Res {
     pub tile_atlas: SfBox<Texture>,
     pub surf_music: Music<'static>,
     pub und_music: Music<'static>,
+    pub lighting_shader: Shader<'static>,
 }
 
 impl Res {
@@ -12,6 +17,10 @@ impl Res {
             tile_atlas: Texture::from_file("res/tiles.png")?,
             surf_music: Music::from_file("res/music.ogg").unwrap(),
             und_music: Music::from_file("res/cave2.ogg").unwrap(),
+            lighting_shader: Shader::from_memory(
+                include_str!("../shaders/lighting.glsl"),
+                ShaderType::Fragment,
+            )?,
         })
     }
 }