From b5ced3af46c96ceb959fbbf1addfeba3bd4f76d5 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 15 Apr 2026 16:53:58 -0400
Subject: first commit. working body rendering

---
 assets/shaders/canvas.wgsl  | 32 ++++++++++++++++++
 assets/shaders/tacbody.wgsl | 79 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 assets/shaders/canvas.wgsl
 create mode 100644 assets/shaders/tacbody.wgsl

(limited to 'assets/shaders')

diff --git a/assets/shaders/canvas.wgsl b/assets/shaders/canvas.wgsl
new file mode 100644
index 0000000..3be1a77
--- /dev/null
+++ b/assets/shaders/canvas.wgsl
@@ -0,0 +1,32 @@
+struct VertexInput {
+    @location(0) position: vec3<f32>,
+    @location(1) uv: vec2<f32>
+};
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) uv: vec2<f32>
+};
+
+@vertex
+fn vs_main(
+    model: VertexInput,
+) -> VertexOutput {
+    var out: VertexOutput;
+
+    out.clip_position = vec4<f32>(model.position, 1.0);
+    out.uv = model.uv;
+
+    return out;
+}
+
+@group(0) @binding(0)
+var canvas_texture: texture_2d<f32>;
+@group(0) @binding(1)
+var canvas_sampler: sampler;
+
+@fragment
+fn fs_main(in: VertexOutput
+) -> @location(0) vec4<f32> {
+    return textureSample(canvas_texture, canvas_sampler, in.uv);
+}
diff --git a/assets/shaders/tacbody.wgsl b/assets/shaders/tacbody.wgsl
new file mode 100644
index 0000000..e8fb653
--- /dev/null
+++ b/assets/shaders/tacbody.wgsl
@@ -0,0 +1,79 @@
+struct VertexInput {
+    @location(0) position: vec3<f32>
+};
+
+struct InstanceInput {
+    @location(2) position: vec3<f32>,
+    @location(3) radius: f32
+};
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) local_position: vec3<f32>
+};
+
+struct CameraUniform {
+    view: mat4x4<f32>,
+    proj: mat4x4<f32>,
+    scale: f32
+};
+
+@group(0) @binding(0)
+var<uniform> camera: CameraUniform;
+
+@vertex
+fn vs_main(
+    model: VertexInput,
+    instance: InstanceInput
+) -> VertexOutput {
+    var out: VertexOutput;
+
+    var view = camera.view;
+    
+    //Billboard the circle
+    view[0][0] = 1.0;
+    view[0][1] = 0.0;
+    view[0][2] = 0.0;
+
+    view[1][0] = 0.0;
+    view[1][1] = 1.0;
+    view[1][2] = 0.0;
+
+    view[2][0] = 0.0;
+    view[2][1] = 0.0;
+    view[2][2] = 1.0;
+
+    let min_size = 0.025;
+
+    //Scale the world around the camera scale.
+    let model_pos = model.position;
+    let instance_pos = instance.position * camera.scale;
+
+    let view_proj = camera.proj * view;
+
+    let center_view_pos = view_proj * vec4<f32>(instance_pos, 1.0);
+    let vertex_view_pos = view_proj * vec4<f32>(instance_pos + (model_pos * camera.scale), 1.0);
+
+    let vertex_dist = length(vertex_view_pos - center_view_pos) / center_view_pos.w;
+    if vertex_dist < min_size {
+        out.clip_position = center_view_pos / center_view_pos.w;
+        out.clip_position += camera.proj * vec4<f32>(model_pos.xy * (min_size / 2), 0.0, 0.0);
+    }else{
+        out.clip_position = vertex_view_pos;
+    }
+
+    out.local_position = model.position;
+
+    return out;
+}
+
+@fragment
+fn fs_main(in: VertexOutput
+) -> @location(0) vec4<f32> {
+    let point_dist = length(in.local_position);
+    var alpha = 1.0;
+    if point_dist > 1.0 {
+        alpha = 0.0;
+    }
+    return vec4<f32>(1.0, 1.0, 1.0, alpha);
+}
-- 
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