Add MSAA to shader_prepass example

examples/shader/shader_prepass.rs

@@ -29,7 +29,7 @@ fn main() {
  },
  ))
  .add_systems(Startup, setup)
- .add_systems(Update, (rotate, toggle_prepass_view))
+ .add_systems(Update, (rotate, toggle_prepass_view, toggle_multisampling))
  // Disabling MSAA for maximum compatibility. Shader prepass with MSAA needs GPU capability MULTISAMPLED_SHADING
  .insert_resource(Msaa::Off)
  .run();
@@ -142,10 +142,12 @@ fn setup(
  commands.spawn(
  TextBundle::from_sections(vec![
  TextSection::new("Prepass Output: transparent\n", style.clone()),
+ TextSection::new("MSAA: Off\n", style.clone()),
  TextSection::new("\n\n", style.clone()),
  TextSection::new("Controls\n", style.clone()),
  TextSection::new("---------------\n", style.clone()),
- TextSection::new("Space - Change output\n", style),
+ TextSection::new("Space - Change output\n", style.clone()),
+ TextSection::new("M - Change MSAA\n", style),
  ])
  .with_style(Style {
  position_type: PositionType::Absolute,
@@ -242,17 +244,9 @@ fn toggle_prepass_view(
  3 => "motion vectors",
  _ => unreachable!(),
  };
- let text_color = if *prepass_view == 3 {
- Color::BLACK
- } else {
- Color::WHITE
- };
 
  let mut text = text.single_mut();
  text.sections[0].value = format!("Prepass Output: {label}\n");
- for section in &mut text.sections {
- section.style.color = text_color;
- }
 
  let handle = material_handle.single();
  let mat = materials.get_mut(handle).unwrap();
@@ -261,3 +255,20 @@ fn toggle_prepass_view(
  mat.settings.show_motion_vectors = (*prepass_view == 3) as u32;
  }
 }
+
+fn toggle_multisampling(
+ keycode: Res<Input<KeyCode>>,
+ mut text: Query<&mut Text>,
+ mut msaa: ResMut<Msaa>,
+) {
+ if keycode.just_pressed(KeyCode::M) {
+ *msaa = match *msaa {
+ Msaa::Off => Msaa::Sample2,
+ Msaa::Sample2 => Msaa::Sample4,
+ Msaa::Sample4 => Msaa::Sample8,
+ Msaa::Sample8 => Msaa::Off,
+ };
+ let mut text = text.single_mut();
+ text.sections[1].value = format!("MSAA: {:?}\n", *msaa);
+ }
+}