From 7c23c32e4401ddc3bcf899c670a9637348188f86 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Thu, 20 Aug 2020 20:45:45 -0400
Subject: [PATCH] Corrects composition colour phase.

---
 OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal b/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal
index 2cc6d10fa..3e0ed2cd5 100644
--- a/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal	
+++ b/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal	
@@ -174,7 +174,11 @@ vertex SourceInterpolator scanToComposition(	constant Uniforms &uniforms [[buffe
 	result.position.zw = float2(0.0, 1.0);
 	result.textureCoordinates.x = mix(scans[instanceID].endPoints[0].dataOffset, scans[instanceID].endPoints[1].dataOffset, float(vertexID));
 	result.textureCoordinates.y = scans[instanceID].dataY;
-	result.colourPhase = mix(scans[instanceID].endPoints[0].compositeAngle, scans[instanceID].endPoints[1].compositeAngle, float(vertexID))  / 32.0f;
+	result.colourPhase = 3.141592654f * mix(
+		float(scans[instanceID].endPoints[0].compositeAngle),
+		float(scans[instanceID].endPoints[1].compositeAngle),
+		float(vertexID)
+	) / 32.0;
 	result.colourAmplitude = float(scans[instanceID].compositeAmplitude) / 255.0f;
 
 	// Map position into eye space, allowing for target texture dimensions.