From 961f8c6d405c9c6fcf9aaf4fb6f199b0e5c60d88 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Thu, 30 Apr 2026 10:06:32 -0400
Subject: add orbit rendering for bodies

---
 src/wgpuctx/pipeline.rs | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

(limited to 'src/wgpuctx/pipeline.rs')

diff --git a/src/wgpuctx/pipeline.rs b/src/wgpuctx/pipeline.rs
index 0811800..d698ac4 100644
--- a/src/wgpuctx/pipeline.rs
+++ b/src/wgpuctx/pipeline.rs
@@ -14,7 +14,8 @@ pub struct RenderPipelineBuilder<'a>
 
     vertex_buffer_layouts: Vec<wgpu::VertexBufferLayout<'a>>,
 
-    cull_mode: Option<wgpu::Face>
+    cull_mode: Option<wgpu::Face>,
+    primitive_topology: wgpu::PrimitiveTopology
 }
 
 impl<'a> RenderPipelineBuilder<'a>
@@ -34,7 +35,8 @@ impl<'a> RenderPipelineBuilder<'a>
 
             vertex_buffer_layouts: Vec::new(),
 
-            cull_mode: Some(wgpu::Face::Back)
+            cull_mode: Some(wgpu::Face::Back),
+            primitive_topology: wgpu::PrimitiveTopology::TriangleList
         }
     }
 
@@ -61,6 +63,13 @@ impl<'a> RenderPipelineBuilder<'a>
         self.cull_mode = mode; self
     }
 
+    pub fn primitive_topology(
+        mut self,
+        topology: wgpu::PrimitiveTopology
+    ) -> Self {
+        self.primitive_topology = topology; self
+    }
+
     pub fn build(
         self,
         label: Option<&'static str>,
@@ -109,8 +118,10 @@ impl<'a> RenderPipelineBuilder<'a>
                     })],
                 }),
                 primitive: wgpu::PrimitiveState {
-                    topology: wgpu::PrimitiveTopology::TriangleList,
-                    strip_index_format: None,
+                    topology: self.primitive_topology,
+                    strip_index_format: if self.primitive_topology.is_strip() {
+                        Some(wgpu::IndexFormat::Uint32) } else {
+                        None },
                     front_face: wgpu::FrontFace::Ccw,
                     cull_mode: self.cull_mode,
                     polygon_mode: wgpu::PolygonMode::Fill,
-- 
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