Switch to lightmap texture based lighting

src/res.rs

@@ -1,27 +1,20 @@
-use sfml::{
-    audio::Music,
-    graphics::{Shader, ShaderType, Texture},
-    SfBox,
-};
+use sfml::{audio::Music, graphics::Texture, SfBox};
 
 #[derive(Debug)]
 pub struct Res {
     pub tile_atlas: SfBox<Texture>,
+    pub light_texture: SfBox<Texture>,
     pub surf_music: Music<'static>,
     pub und_music: Music<'static>,
-    pub lighting_shader: Shader<'static>,
 }
 
 impl Res {
     pub fn load() -> anyhow::Result<Self> {
         Ok(Self {
             tile_atlas: Texture::from_file("res/tiles.png")?,
+            light_texture: Texture::from_file("res/lightcircle.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,
-            )?,
         })
     }
 }