evolve dave into a swarm

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_dave/src/avatar.rs

@@ -58,11 +58,65 @@ fn matrix_multiply(a: &[f32; 16], b: &[f32; 16]) -> [f32; 16] {
     result
 }
 
+fn lerp3(a: [f32; 3], b: [f32; 3], t: f32) -> [f32; 3] {
+    [
+        a[0] + (b[0] - a[0]) * t,
+        a[1] + (b[1] - a[1]) * t,
+        a[2] + (b[2] - a[2]) * t,
+    ]
+}
+
+fn generate_dave_instances(instance_count: u32) -> Vec<mesh::Instance> {
+    let mut rng = rand::rng();
+    let mut instances = Vec::with_capacity(instance_count as usize);
+
+    // Logo gradient endpoints (0–1 range)
+    const C0: [f32; 3] = [53.0 / 255.0, 77.0 / 255.0, 235.0 / 255.0]; // rgb(53, 77, 235)
+    const C1: [f32; 3] = [229.0 / 255.0, 20.0 / 255.0, 205.0 / 255.0]; // rgb(229, 20, 205)
+    let golden_angle = std::f32::consts::PI * (3.0 - 5.0_f32.sqrt());
+
+    for i in 0..instance_count {
+        let i_f = (i as f32) + 0.5;
+        let n = instance_count as f32;
+
+        // Fibonacci sphere (unit directions)
+        let z = 1.0 - (2.0 * i_f) / n;
+        let r = (1.0 - z * z).sqrt();
+        let theta = golden_angle * i_f;
+
+        // Use base_pos as *direction*; shader will normalize/scale anyway
+        let base_pos = [r * theta.cos(), z, r * theta.sin()];
+
+        let scale = 0.03;
+
+        //let scale = scale + scale_var + rng.random::<f32>() * scale; // slightly smaller cubes
+        let seed = rng.random::<f32>() * 1000.0;
+
+        // damus logo gradient
+        let t_base = (z + 1.0) * 0.5; // 0..1
+        let t_jitter = (rng.random::<f32>() - 0.5) * 0.06; // ±0.03
+        let t = (t_base + t_jitter).clamp(0.0, 1.0);
+        let color = lerp3(C0, C1, t);
+
+        instances.push(mesh::Instance {
+            base_pos,
+            scale,
+            seed,
+            color,
+        });
+    }
+
+    instances
+}
+
 impl DaveAvatar {
     pub fn new(wgpu_render_state: &egui_wgpu::RenderState) -> Self {
-        let device = &wgpu_render_state.device;
         const BINDING_SIZE: u64 = 256;
 
+        let device = &wgpu_render_state.device;
+        let instance_count: u32 = 256;
+        let instances = generate_dave_instances(instance_count);
+
         // Create shader module with improved shader code
         let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
             label: Some("cube_shader"),
@@ -115,6 +169,12 @@ impl DaveAvatar {
             usage: wgpu::BufferUsages::VERTEX,
         });
 
+        let instance_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("cube_instances"),
+            contents: bytemuck::cast_slice(&instances),
+            usage: wgpu::BufferUsages::VERTEX | wgpu::BufferUsages::COPY_DST,
+        });
+
         let index_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
             label: Some("cube_indices"),
             contents: bytemuck::cast_slice(&mesh::CUBE_INDICES),
@@ -128,7 +188,7 @@ impl DaveAvatar {
             vertex: wgpu::VertexState {
                 module: &shader,
                 entry_point: Some("vs_main"),
-                buffers: &[mesh::Vertex::LAYOUT],
+                buffers: &[mesh::Vertex::LAYOUT, mesh::Instance::LAYOUT],
                 compilation_options: wgpu::PipelineCompilationOptions::default(),
             },
             fragment: Some(wgpu::FragmentState {
@@ -171,8 +231,10 @@ impl DaveAvatar {
                 pipeline,
                 bind_group,
                 uniform_buffer,
+                instance_buffer,
                 vertex_buffer,
                 index_buffer,
+                instance_count,
             });
 
         let initial_rot = {
@@ -182,6 +244,7 @@ impl DaveAvatar {
             // Apply rotations (order matters)
             y_rotation.multiply(&x_rotation)
         };
+
         Self {
             rotation: initial_rot,
             rot_dir: Vec3::new(0.0, 0.0, 0.0),
@@ -271,10 +334,10 @@ impl DaveAvatar {
         let projection = perspective_matrix(std::f32::consts::PI / 4.0, aspect, 0.1, 100.0);
 
         // Create view matrix (move camera back a bit)
-        let camera_pos = [0.0, 0.0, 3.0, 0.0];
+        let camera_pos = [0.0, 0.0, 1.5];
 
         // Right-handed look-at at origin; view is a translate by -camera_pos
-        let [cx, cy, cz, _] = camera_pos;
+        let [cx, cy, cz] = camera_pos;
 
         #[rustfmt::skip]
         let view = [
@@ -285,6 +348,11 @@ impl DaveAvatar {
         ];
 
         let view_proj = matrix_multiply(&projection, &view);
+        let is_light = if ui.ctx().theme() == egui::Theme::Light {
+            1.0
+        } else {
+            -1.0
+        };
 
         // Add paint callback
         ui.painter().add(egui_wgpu::Callback::new_paint_callback(
@@ -293,6 +361,8 @@ impl DaveAvatar {
                 view_proj,
                 model,
                 camera_pos,
+                time: ui.ctx().input(|i| i.time as f32),
+                is_light: [is_light, 0.0, 0.0, 0.0],
             },
         ));
 
@@ -306,7 +376,9 @@ impl DaveAvatar {
 struct GpuData {
     view_proj: [f32; 16], // Model-View-Projection matrix
     model: [f32; 16],     // Model matrix for lighting calculations
-    camera_pos: [f32; 4], // xyz + pad
+    camera_pos: [f32; 3], // xyz
+    time: f32,
+    is_light: [f32; 4],
 }
 
 impl egui_wgpu::CallbackTrait for GpuData {
@@ -337,8 +409,13 @@ impl egui_wgpu::CallbackTrait for GpuData {
         render_pass.set_pipeline(&resources.pipeline);
         render_pass.set_bind_group(0, &resources.bind_group, &[]);
         render_pass.set_vertex_buffer(0, resources.vertex_buffer.slice(..));
+        render_pass.set_vertex_buffer(1, resources.instance_buffer.slice(..));
         render_pass.set_index_buffer(resources.index_buffer.slice(..), wgpu::IndexFormat::Uint16);
-        render_pass.draw_indexed(0..mesh::CUBE_INDICES.len() as u32, 0, 0..1); // 36 vertices for a cube (6 faces * 2 triangles * 3 vertices)
+        render_pass.draw_indexed(
+            0..mesh::CUBE_INDICES.len() as u32,
+            0,
+            0..resources.instance_count,
+        );
     }
 }
 
@@ -347,6 +424,8 @@ struct CubeRenderResources {
     pipeline: wgpu::RenderPipeline,
     bind_group: wgpu::BindGroup,
     uniform_buffer: wgpu::Buffer,
+    instance_buffer: wgpu::Buffer,
     vertex_buffer: wgpu::Buffer,
     index_buffer: wgpu::Buffer,
+    instance_count: u32,
 }

crates/notedeck_dave/src/dave.wgsl

@@ -1,8 +1,9 @@
-
 struct Uniforms {
     view_proj: mat4x4<f32>,
     model: mat4x4<f32>,
-    camera_pos: vec4<f32>,  // world-space camera position
+    camera_pos: vec3<f32>,
+    time: f32,
+    is_light: vec4<f32>,
 };
 
 @group(0) @binding(0)
@@ -12,40 +13,85 @@ struct VSOut {
     @builtin(position) position: vec4<f32>,
     @location(0) normal: vec3<f32>,
     @location(1) world_pos: vec3<f32>,
+    @location(2) color: vec3<f32>,
 };
 
+// Vertex inputs
 @vertex
 fn vs_main(
     @location(0) in_pos: vec3<f32>,
-    @location(1) in_normal: vec3<f32>
+    @location(1) in_normal: vec3<f32>,
+    @location(2) base_pos: vec3<f32>,
+    @location(3) scale: f32,
+    @location(4) seed: f32,
+    @location(5) color: vec3<f32>,
 ) -> VSOut {
     var out: VSOut;
-    let world = uniforms.model * vec4<f32>(in_pos, 1.0);
+
+    let t = uniforms.time;
+
+    // --- Coherent spherical layout ---
+    let dir = normalize(base_pos + vec3<f32>(1e-6, 0.0, 0.0)); // avoid NaN if zero
+    let radius = 0.4;
+
+    // Gentle, coherent drift so it breathes
+    let drift = vec3<f32>(
+        0.06 * sin(0.9 * t + seed * 1.3),
+        0.05 * sin(1.1 * t + seed * 2.1),
+        0.06 * cos(0.7 * t + seed * 0.7)
+    );
+
+    // Final instance position on/near the sphere
+    //let loose = 0.2 * base_pos + drift;
+    let tight = dir * radius + drift;
+    //let tight = dir * radius;
+    //let coherence = 0.8; // [0..1], or pass as a uniform
+    //let pos_ws = mix(loose, tight, coherence);
+    let pos_ws = tight;
+
+    // --- Orient cube so its local +Z points outward (along dir) ---
+    // Build a stable tangent basis
+    var up = vec3<f32>(0.0, 1.0, 0.0);
+    if (abs(dot(dir, up)) > 0.92) {
+        up = vec3<f32>(1.0, 0.0, 0.0);
+    }
+    let tangent   = normalize(cross(up, dir));
+    let bitangent = cross(dir, tangent);
+
+    // Optional tiny spin around outward axis for sparkle
+    let spin = 0.9 * t + seed * 0.9;
+    let cs = cos(spin);
+    let sn = sin(spin);
+    let rot_tangent   =  cs * tangent + sn * bitangent;
+    let rot_bitangent = -sn * tangent + cs * bitangent;
+
+    // Rotation matrix whose columns are the local basis
+    let R = mat3x3<f32>(rot_tangent, rot_bitangent, dir);
+
+    // Scale + orient local vertex + place at spherical position
+    let local = R * (in_pos * scale);
+    let world_vec4 = uniforms.model * vec4<f32>(local, 1.0);
+    let world = world_vec4 + vec4<f32>(pos_ws, 0.0);
+
     out.position = uniforms.view_proj * world;
 
-    // normal = (model rotation) * in_normal
+    // Normal from model rotation only (ignoring per-instance rotation for now)
     let nmat = mat3x3<f32>(
         uniforms.model[0].xyz,
         uniforms.model[1].xyz,
         uniforms.model[2].xyz
     );
-    //out.normal = normalize(transpose(inverse(nmat)) * in_normal);
     out.normal = normalize(nmat * in_normal);
     out.world_pos = world.xyz;
+    out.color = color;
     return out;
 }
 
-@fragment
-fn fs_main_debug(in: VSOut) -> @location(0) vec4<f32> {
-    let g = normalize(cross(dpdx(in.world_pos), dpdy(in.world_pos)));
-    let n = normalize(in.normal);
-    let shown = 0.5 * (n + vec3<f32>(1.0,1.0,1.0));
-    return vec4<f32>(shown, 1.0);
-}
-
 @fragment
 fn fs_main(in: VSOut) -> @location(0) vec4<f32> {
-    let material_color = vec3<f32>(1.0, 1.0, 1.0);
+    // Same lighting as you had, but tint by per-instance color
+    let material_color = in.color;
+
     let ambient_strength = 0.2;
     let diffuse_strength = 0.7;
     let specular_strength = 0.2;
@@ -53,20 +99,57 @@ fn fs_main(in: VSOut) -> @location(0) vec4<f32> {
 
     let light_pos = vec3<f32>(2.0, 2.0, 2.0);
     let light_color = vec3<f32>(1.0, 1.0, 1.0);
-    let view_pos = uniforms.camera_pos.xyz;
-
-    let ambient = ambient_strength * light_color;
+    let view_pos = uniforms.camera_pos;
 
     let n = normalize(in.normal);
     let l = normalize(light_pos - in.world_pos);
-    let diff = max(dot(n, l), 0.0);
-    let diffuse = diffuse_strength * diff * light_color;
-
     let v = normalize(view_pos - in.world_pos);
     let r = reflect(-l, n);
-    let spec = pow(max(dot(v, r), 0.0), shininess);
-    let specular = specular_strength * spec * light_color;
 
-    let result = (ambient + diffuse + specular) * material_color;
-    return vec4<f32>(result, 1.0);
+    let ambient = ambient_strength * light_color;
+    let diffuse = diffuse_strength * max(dot(n, l), 0.0) * light_color;
+    let specular = specular_strength * pow(max(dot(v, r), 0.0), shininess) * light_color;
+
+    let exposure = exp2(1.5);
+    var color = (ambient + diffuse + specular) * material_color;
+
+    // --- Distance-based factor (camera-space distance) ---
+    let dist       = length(view_pos - in.world_pos);
+    let FADE_NEAR  = 1.0;  // start ramping here
+    let FADE_FAR   = 2.2;  // fully applied by here
+    let fade       = smoothstep(FADE_NEAR, FADE_FAR, dist); // 0..1
+
+    // --- Exposure drift with distance (sign flips by mode) ---
+    // Dark mode target exposure at far: lower; Light mode target at far: higher.
+    let min_exp    = 1.80; // far-end exposure multiplier in dark mode
+    let max_exp    = 1.35; // far-end exposure multiplier in light mode
+    let darker     = mix(1.0, min_exp, fade);   // darkens with distance
+    let brighter   = mix(1.0, max_exp, fade);   // brightens with distance
+    let exp_factor = select(darker, brighter, uniforms.is_light.x > 0.0);
+
+    // Apply exposure + tonemap
+    let base_exposure = exp2(1.5);
+    color = aces_fitted(color * base_exposure * exp_factor);
+
+    // --- Optional: fade to background so distant points dissolve away ---
+    // Background: black in dark mode, white in light mode.
+    let bg = select(vec3<f32>(0.0), vec3<f32>(1.0), uniforms.is_light.x > 0.0);
+    // If you want white for BOTH modes instead, use:
+    // let bg = vec3<f32>(1.0);
+
+    color = mix(color, bg, fade);
+
+    return vec4<f32>(color, 1.0);
+}
+
+
+
+// ACES-fit tonemap (keeps highlights nicer than Reinhard)
+fn aces_fitted(x: vec3<f32>) -> vec3<f32> {
+    let a = 2.51;
+    let b = 0.03;
+    let c = 2.43;
+    let d = 0.59;
+    let e = 0.14;
+    return clamp((x * (a * x + b)) / (x * (c * x + d) + e), vec3(0.0), vec3(1.0));
 }

crates/notedeck_dave/src/lib.rs

@@ -27,7 +27,7 @@ pub use vec3::Vec3;
 
 mod avatar;
 mod config;
-mod mesh;
+pub(crate) mod mesh;
 mod messages;
 mod quaternion;
 mod tools;
@@ -180,6 +180,15 @@ You are an AI agent for the nostr protocol called Dave, created by Damus. nostr
     }
 
     fn ui(&mut self, app_ctx: &mut AppContext, ui: &mut egui::Ui) -> DaveResponse {
+        /*
+        let rect = ui.available_rect_before_wrap();
+        if let Some(av) = self.avatar.as_mut() {
+            av.render(rect, ui);
+            ui.ctx().request_repaint();
+        }
+        DaveResponse::default()
+            */
+
         DaveUi::new(self.model_config.trial, &self.chat, &mut self.input).ui(
             app_ctx,
             &mut self.jobs,

crates/notedeck_dave/src/mesh.rs

@@ -19,6 +19,29 @@ impl Vertex {
     };
 }
 
+#[repr(C)]
+#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct Instance {
+    pub base_pos: [f32; 3],
+    pub scale: f32,
+    pub seed: f32,
+    pub color: [f32; 3],
+}
+
+impl Instance {
+    pub const ATTRS: [wgpu::VertexAttribute; 4] = wgpu::vertex_attr_array![
+        2 => Float32x3, // base_pos
+        3 => Float32,   // scale
+        4 => Float32,   // seed
+        5 => Float32x3  // color
+    ];
+    pub const LAYOUT: wgpu::VertexBufferLayout<'static> = wgpu::VertexBufferLayout {
+        array_stride: std::mem::size_of::<Instance>() as wgpu::BufferAddress,
+        step_mode: wgpu::VertexStepMode::Instance,
+        attributes: &Self::ATTRS,
+    };
+}
+
 // 6 faces * 4 verts. Each face has a constant normal.
 #[rustfmt::skip]
 pub const CUBE_VERTICES: [Vertex; 24] = [