added raymarching demo for testing

build.rs

@@ -58,9 +58,16 @@ fn main() {
     let mut compiler = shaderc::Compiler::new().expect("Unable to create shader compiler");
     for shader in shaders {
         println!("cargo:rerun-if-changed={}", shader.src_path.as_os_str().to_str().unwrap());
-        let compiled = compiler.compile_into_spirv(&shader.source, shader.kind, &shader.src_path.to_str().unwrap(), "main", Some(&options)).unwrap();
+        let compiled = compiler.compile_into_spirv(&shader.source, shader.kind, &shader.src_path.to_str().unwrap(), "main", Some(&options))
+            .expect("Shader error:");
         write(shader.spv_path, compiled.as_binary_u8()).unwrap();
     }
+
+    // Rebuild if any of the cginc change
+    for path_str in glob("./src/shaders/**/*.cginc").unwrap() {
+        let path = path_str.unwrap();
+        println!("cargo:rerun-if-changed={}", path.as_os_str().to_str().unwrap());
+    }
 }