Fix issues

src/utils/full-screen-quad.wgsl

@@ -0,0 +1,12 @@
+struct VertexOutput {
+  @builtin(position) position : vec4<f32>,
+  @location(0) uv : vec2<f32>,
+}
+
+@vertex
+fn vertex(
+  @location(0) position : vec2<f32>,
+  @location(1) uv : vec2<f32>
+) -> VertexOutput {
+  return VertexOutput(vec4(position, 0.0, 1.0), uv);
+}