add mouse

assets/shaders/default.wgsl

@@ -2,6 +2,7 @@
 
 @group(2) @binding(0) var<uniform> u_time: f32;
 @group(2) @binding(1) var<uniform> u_resolution: vec2<f32>;
+@group(2) @binding(2) var<uniform> u_mouse_position: vec2<f32>;
 
 @fragment
 fn fragment(mesh: VertexOutput) -> @location(0) vec4<f32> {
@@ -11,7 +12,7 @@ fn fragment(mesh: VertexOutput) -> @location(0) vec4<f32> {
     let red = vec3<f32>(1, 0, 0);
     let blue = vec3<f32>(0, 0, 1.0);
 
-    let t = step(0.5, length(uv));
+    let t = step(0.2 + u_mouse_position.x / u_resolution.x, length(uv));
 
     let color = mix(red, blue, t);
     return vec4<f32>(color, 1);

src/main.rs

@@ -18,6 +18,7 @@ fn main() {
             (
                 material::update_material_time,
                 systems::screen_resized,
+                systems::mouse_moved,
                 systems::exit_app.run_if(input_just_pressed(KeyCode::Escape)),
                 systems::toggle_fullscreen.run_if(input_just_pressed(KeyCode::F11)),
             ),

src/material.rs

@@ -13,6 +13,8 @@ pub struct CustomMaterial {
     pub time: f32,
     #[uniform(1)]
     pub resolution: Vec2,
+    #[uniform(2)]
+    pub mouse_position: Vec2,
 }
 
 pub fn update_material_time(mut materials: ResMut<Assets<CustomMaterial>>, time: Res<Time>) {

src/systems.rs

@@ -25,6 +25,7 @@ pub fn setup(
     let material_handle = materials.add(CustomMaterial {
         time: 0.0,
         resolution: screen_size,
+        mouse_position: Vec2::ZERO,
     });
 
     commands.spawn((
@@ -35,6 +36,19 @@ pub fn setup(
     ));
 }
 
+pub fn mouse_moved(
+    mut events: EventReader<CursorMoved>,
+    shader_material: Single<&MeshMaterial2d<CustomMaterial>, With<FullscreenQuad>>,
+    mut materials: ResMut<Assets<CustomMaterial>>,
+) {
+    if let Some(event) = events.read().last() {
+        materials
+            .get_mut(&shader_material.0)
+            .unwrap()
+            .mouse_position = Vec2::new(event.position.x, event.position.y);
+    }
+}
+
 pub fn screen_resized(
     mut events: EventReader<WindowResized>,
     shader_data: Single<(&mut Transform, &MeshMaterial2d<CustomMaterial>), With<FullscreenQuad>>,