From 7f63ec5c10eb7e8dd4edaabd1a6a437328911d39 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Sun, 10 May 2026 13:29:56 -0400
Subject: fleets

---
 assets/shaders/tacmap/fleet.wgsl | 73 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 assets/shaders/tacmap/fleet.wgsl

(limited to 'assets/shaders/tacmap/fleet.wgsl')

diff --git a/assets/shaders/tacmap/fleet.wgsl b/assets/shaders/tacmap/fleet.wgsl
new file mode 100644
index 0000000..8a87fb9
--- /dev/null
+++ b/assets/shaders/tacmap/fleet.wgsl
@@ -0,0 +1,73 @@
+struct InstanceInput {
+    @location(0) rotmat_0: vec3<f32>,
+    @location(1) rotmat_1: vec3<f32>,
+    @location(2) rotmat_2: vec3<f32>,
+    @location(3) origin: vec3<f32>,
+    @location(4) offset: vec3<f32>,
+};
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) color: vec3<f32>
+};
+
+struct CameraUniform {
+    view: mat4x4<f32>,
+    proj: mat4x4<f32>,
+    abs_pos: vec3<f32>,
+    rel_pos: vec3<f32>,
+    scale: f32,
+};
+
+@group(0) @binding(0)
+var<uniform> camera: CameraUniform;
+
+const FLEET_VERTICES = array<vec3<f32>,6>(
+    vec3<f32>(-1.0, -1.0, 0.0),
+    vec3<f32>(-1.0, 1.0 , 0.0),
+    vec3<f32>(1.0,  0.0 , 0.0),
+
+    vec3<f32>(-1.0, 0.0, -1.0),
+    vec3<f32>(-1.0, 0.0, 1.0 ),
+    vec3<f32>(1.0,  0.0, 0.0 ),
+);
+
+@vertex
+fn vs_main(
+    @builtin(vertex_index) index: u32,
+    instance: InstanceInput
+) -> VertexOutput {
+    var out: VertexOutput;
+
+    let rotmat = mat3x3<f32>(
+        instance.rotmat_0,
+        instance.rotmat_1,
+        instance.rotmat_2
+    );
+    let model_pos = rotmat * FLEET_VERTICES[index] * 0.025;
+    var view = camera.view;
+
+    let min_size = 0.025;
+
+    //Scale the world around the camera scale and translate about the camera's
+    //absolute (/target) position
+    let origin_pos = instance.origin - camera.abs_pos;
+    let offset_pos = instance.offset - camera.rel_pos;
+
+    let instance_pos = (offset_pos + origin_pos) * camera.scale;
+    let vertex_pos = instance_pos + model_pos;
+
+    let view_proj = camera.proj * view;
+    let instance_vp_pos = view_proj * vec4<f32>(instance_pos, 1.0);
+    let model_vp_pos = view_proj * vec4<f32>(model_pos, 0.0);
+
+    out.clip_position = instance_vp_pos + model_vp_pos;
+    out.color = vec3<f32>(0.75, 1.0, 0.75);
+    return out;
+}
+
+@fragment
+fn fs_main(in: VertexOutput
+) -> @location(0) vec4<f32> {
+    return vec4<f32>(in.color, 1.0);
+}
-- 
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