From 2d4d856e55ffa484a932c8a122391908663a39a8 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Sat, 21 May 2022 12:14:05 -0700
Subject: [PATCH] examples/gkurve: fix bug in barycentric coordinates

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 examples/gkurve/vert.wgsl | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/gkurve/vert.wgsl b/examples/gkurve/vert.wgsl
index 18d9fe0e..d3e835d4 100644
--- a/examples/gkurve/vert.wgsl
+++ b/examples/gkurve/vert.wgsl
@@ -19,7 +19,7 @@ struct VertexOut {
     output.position_clip = ubo.matrix * position;
     output.frag_uv = uv;
 
-    // Generates [0, 0], [0.5, 0.0], [1.0, 1.0]
+    // Generates [0.0, 0.0], [0.5, 0.0], [1.0, 1.0]
     //
     // Equal to:
     //
@@ -32,8 +32,8 @@ struct VertexOut {
     // }
     //
     output.frag_bary = vec2<f32>(
-        f32(((vertex_index+2u) % 3u * 2u) % 3u),
-        f32(((vertex_index+2u) % 3u * 2u) & 2u) * 2.0,
+        f32((vertex_index+1u) % 3u) * 0.5,
+        1.0 - f32((((vertex_index + 3u) % 3u) + 1u) % 2u),
     );
     output.triangle_index = vertex_index / 3u;
     return output;