better explosions

1 files changed, 7 insertions, 2 deletions

diff --git a/src/shader/particle.wgsl b/src/shader/particle.wgsl
index 704cfbe..3dd61a9 100644
--- a/src/shader/particle.wgsl
+++ b/src/shader/particle.wgsl
@@ -6,6 +6,7 @@ struct Camera {
 struct Particle {
     position: vec2f,
     data: u32,
+    life: f32,
 };
 
 @group(0) @binding(0) var<uniform> camera: Camera;
@@ -16,6 +17,8 @@ struct VertexOutput {
     @builtin(position) clip_position: vec4<f32>,
     @location(0) world: vec2<f32>,
     @location(1) @interpolate(flat) instance: u32,
+    @location(2) @interpolate(flat) material: u32,
+    @location(3) @interpolate(flat) life: f32,
 };
 
 @vertex
@@ -33,6 +36,8 @@ fn vs_main(
     out.clip_position = vec4f((world - camera.centre) * camera.scale, 0.0, 1.0);
     out.world = world;
     out.instance = n;
+    out.material = particle.data & 0xFF;
+    out.life = particle.life;
 
     return out;
 }
@@ -41,6 +46,6 @@ fn vs_main(
 fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     let particle = particles[in.instance];
     // TODO can pack more in here and shift
-    let c = palette[particle.data];
-    return c;
+    let c = palette[in.material];
+    return vec4<f32>(c.r, c.g, c.b, c.a * smoothstep(0.0, 1, in.life));
 }