From a97204c6e4dd4f73379cf7ad0fa0a1be16eff62a Mon Sep 17 00:00:00 2001
From: "Elijah C. Voigt" <elijah.caine.mv@gmail.com>
Date: Fri, 19 Jan 2024 23:30:11 -0800
Subject: [PATCH] Animated driven by rust instead of shader!

FTW!!!
---
 assets/examples/shaders/dissolve.wgsl | 7 ++-----
 examples/shaders.rs                   | 8 ++++++--
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/assets/examples/shaders/dissolve.wgsl b/assets/examples/shaders/dissolve.wgsl
index 39cdce8..da4e520 100644
--- a/assets/examples/shaders/dissolve.wgsl
+++ b/assets/examples/shaders/dissolve.wgsl
@@ -10,8 +10,7 @@
 }
 
 struct MatExt {
-	step: u32,
-	// Cutoff (for animation)
+	cutoff: f32,
 }
 
 @group(1) @binding(100)
@@ -68,9 +67,7 @@ fn fragment(
 
 	var n = fbm(pos);
 
-	// out.color *= n;
-
-	var cutoff = abs(sin(globals.time));
+	var cutoff = mat_ext.cutoff; // abs(sin(globals.time));
 
 	if n > cutoff {
 		discard;
diff --git a/examples/shaders.rs b/examples/shaders.rs
index 3b11da0..c407e0a 100644
--- a/examples/shaders.rs
+++ b/examples/shaders.rs
@@ -37,7 +37,7 @@ fn setup(
 				alpha_mode: AlphaMode::Mask(0.5),
 				..default()
 			},
-			extension: MatExt { step: 3 },
+			extension: MatExt { cutoff: 0.5 },
 		}),
 		..default()
 	});
@@ -60,7 +60,7 @@ fn setup(
 #[derive(Asset, AsBindGroup, Reflect, Debug, Clone)]
 struct MatExt {
 	#[uniform(100)]
-	step: u32,
+	cutoff: f32,
 }
 
 impl MaterialExtension for MatExt {
@@ -72,10 +72,14 @@ impl MaterialExtension for MatExt {
 fn rotate(
 	mut query: Query<&mut Transform, With<Handle<Mesh>>>,
 	time: Res<Time>,
+	mut materials: ResMut<Assets<MyMat>>,
 ) {
 	query.iter_mut().for_each(|mut t| {
 		t.rotate_local_y(time.delta_seconds() / 2.0);
 		t.rotate_local_z(time.delta_seconds() / 2.0);
 		t.rotate_local_x(time.delta_seconds() / 2.0);
+	});
+	materials.iter_mut().for_each(|(_id, m)| {
+		m.extension.cutoff = time.elapsed_seconds().sin().abs();
 	})
 }
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