From 534b6bb9e1c1239ddc3e041e26a4d7f269b9b9e8 Mon Sep 17 00:00:00 2001
From: Brian Schwind <brianmschwind@gmail.com>
Date: Mon, 25 Mar 2024 20:00:41 +0900
Subject: [PATCH] Experiment with clipping edges as well

---
 crates/viewer/shaders/edge.wgsl | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/crates/viewer/shaders/edge.wgsl b/crates/viewer/shaders/edge.wgsl
index ce2e3c76..ff2ff817 100644
--- a/crates/viewer/shaders/edge.wgsl
+++ b/crates/viewer/shaders/edge.wgsl
@@ -33,6 +33,9 @@ struct VertexOutput {
 
     @location(0)
     dist: f32,
+
+    @location(1)
+    plane_distance: f32,
 };
 
 @vertex
@@ -46,6 +49,8 @@ fn main_vs(input: VertexInput) -> VertexOutput {
     let clip0 = globals.proj * globals.transform * vec4<f32>(input.point_a.xyz, 1.0);
     let clip1 = globals.proj * globals.transform * vec4<f32>(input.point_b.xyz, 1.0);
 
+    let interpolated_pos = vec4<f32>(mix(input.point_a.xyz, input.point_b.xyz, vec3<f32>(input.pos.z)), 1.0);
+
     // Transform the segment endpoints to screen space
     let a = globals.resolution.xy * (0.5 * clip0.xy / clip0.w + 0.5);
     let b = globals.resolution.xy * (0.5 * clip1.xy / clip1.w + 0.5);
@@ -63,11 +68,18 @@ fn main_vs(input: VertexInput) -> VertexOutput {
     out.pos = vec4<f32>(clip.w * ((2.0 * final_pos) / globals.resolution.xy - 1.0), clip.z, clip.w);
     out.dist = mix(input.length_so_far_a.x, input.length_so_far_b.x, input.pos.z);
 
+    var plane = vec4<f32>(-1.0, 0.8, 1.2, 40.0);
+    out.plane_distance = dot(plane, interpolated_pos);
+
     return out;
 }
 
 @fragment
 fn main_fs(input: VertexOutput) -> @location(0) vec4<f32> {
+    if input.plane_distance > 0.0 {
+        discard;
+    }
+
     let r = 0.0;
     let g = 0.0;
     let b = 0.0;