From dd0570f4c7babf825c255d4a70eb65cdfbef98c3 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 26 Feb 2026 18:10:04 +0000
Subject: Allow specifying all three partition functions independently

Two predicate version behaviour is unchanged, the second predicate is
just the inverse of the third.
---
 gfx/gl/instanceVertices.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/gfx/gl/instanceVertices.h b/gfx/gl/instanceVertices.h
index 2417a91..ecadf8f 100644
--- a/gfx/gl/instanceVertices.h
+++ b/gfx/gl/instanceVertices.h
@@ -143,10 +143,17 @@ public:
 	template<typename Pred1, typename Pred2>
 	PartitionResult
 	partition(Pred1 pred1, Pred2 pred2)
+	{
+		return partition(pred1, std::not_fn(pred2), pred2);
+	}
+
+	template<typename Pred1, typename Pred2, typename Pred3>
+	PartitionResult
+	partition(Pred1 pred1, Pred2 pred2, Pred3 pred3)
 	{
 		auto boundary1 = partition(base::begin(), base::end(), pred1);
-		auto begin2 = partition(base::begin(), boundary1, std::not_fn(pred2));
-		auto end2 = partition(boundary1, base::end(), pred2);
+		auto begin2 = partition(base::begin(), boundary1, pred2);
+		auto end2 = partition(boundary1, base::end(), pred3);
 		return {indexOf(boundary1), {indexOf(begin2), indexOf(end2)}};
 	}
 
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