From 2875d4ae61004cc6cee91556fb01dd1c78c09eaf Mon Sep 17 00:00:00 2001
From: Karim Jerbi <k4rim.jerbi@gmail.com>
Date: Wed, 9 Sep 2026 12:56:53 +0100
Subject: [PATCH] fix(render): eliminate depth-write edge conflict at polyline
 arc joints

---
 src/scene/pipeline/circle_gpu.rs  |  2 +-
 src/scene/pipeline/ellipse_gpu.rs |  2 +-
 src/scene/pipeline/mod.rs         | 16 ++++++++++++++--
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/scene/pipeline/circle_gpu.rs b/src/scene/pipeline/circle_gpu.rs
index ba47dcbbb..f38b46605 100644
--- a/src/scene/pipeline/circle_gpu.rs
+++ b/src/scene/pipeline/circle_gpu.rs
@@ -145,7 +145,7 @@ pub fn create_pipelines(
         },
         depth_stencil: Some(wgpu::DepthStencilState {
             format: wgpu::TextureFormat::Depth24PlusStencil8,
-            depth_write_enabled: Some(true),
+            depth_write_enabled: Some(false),
             depth_compare: Some(wgpu::CompareFunction::LessEqual),
             stencil: content_stencil.clone(),
             bias: wgpu::DepthBiasState::default(),
diff --git a/src/scene/pipeline/ellipse_gpu.rs b/src/scene/pipeline/ellipse_gpu.rs
index 170af46ce..0ed65407e 100644
--- a/src/scene/pipeline/ellipse_gpu.rs
+++ b/src/scene/pipeline/ellipse_gpu.rs
@@ -145,7 +145,7 @@ pub fn create_pipelines(
         },
         depth_stencil: Some(wgpu::DepthStencilState {
             format: wgpu::TextureFormat::Depth24PlusStencil8,
-            depth_write_enabled: Some(true),
+            depth_write_enabled: Some(false),
             depth_compare: Some(wgpu::CompareFunction::LessEqual),
             stencil: content_stencil.clone(),
             bias: wgpu::DepthBiasState::default(),
diff --git a/src/scene/pipeline/mod.rs b/src/scene/pipeline/mod.rs
index 7cd070c5a..930de4ba6 100644
--- a/src/scene/pipeline/mod.rs
+++ b/src/scene/pipeline/mod.rs
@@ -2449,11 +2449,17 @@ impl Pipeline {
         if instances.is_empty() {
             vec![]
         } else {
+            let mut sorted = instances.to_vec();
+            sorted.sort_by(|a, b| {
+                a.params[2]
+                    .partial_cmp(&b.params[2])
+                    .unwrap_or(std::cmp::Ordering::Equal)
+            });
             vec![CircleGpu::from_instances(
                 device,
                 queue,
                 "viewer.circles",
-                instances,
+                &sorted,
             )]
         }
     }
@@ -2489,11 +2495,17 @@ impl Pipeline {
         if instances.is_empty() {
             vec![]
         } else {
+            let mut sorted = instances.to_vec();
+            sorted.sort_by(|a, b| {
+                a.params[2]
+                    .partial_cmp(&b.params[2])
+                    .unwrap_or(std::cmp::Ordering::Equal)
+            });
             vec![EllipseGpu::from_instances(
                 device,
                 queue,
                 "viewer.ellipses",
-                instances,
+                &sorted,
             )]
         }
     }