adding some operators, working on example

example/shader.nzsl

@@ -1,17 +1,20 @@
 [nzsl_version("1.1")]
 module;
 
+struct FragIn
+{
+    [location(0)] pos: vec2[f32]
+}
+
 struct FragOut
 {
-    [location(0)] color: vec4[i32]
+    [location(0)] color: vec4[f32]
 }
 
 [entry(frag)]
-fn main() -> FragOut
+fn main(input: FragIn) -> FragOut
 {
-    let base: i32 = 4;
-    let value: i32 = base >> 3;
     let output: FragOut;
-    output.color = vec4[i32](value, value, value, value);
+    output.color = vec4[f32](1.0, 0.0, 0.0, 1.0);
     return output;
 }