From 5c494ad1eecbdc879d4195788a343f806f247874 Mon Sep 17 00:00:00 2001
From: Thomas Debesse <github@illwieckz.net>
Date: Fri, 14 Apr 2023 23:02:00 +0200
Subject: [PATCH] RecastLayers: set RC_MAX_LAYERS and RC_MAX_NEIS as optional
 defines (#624)

It makes possible for a project integrating Recast to set custom values
via CXXFLAGS while remaining build system agnostic.

Type checking is kept.
---
 Recast/Source/RecastLayers.cpp | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/Recast/Source/RecastLayers.cpp b/Recast/Source/RecastLayers.cpp
index d5eb06a..4d4fa46 100644
--- a/Recast/Source/RecastLayers.cpp
+++ b/Recast/Source/RecastLayers.cpp
@@ -28,8 +28,21 @@
 
 // Must be 255 or smaller (not 256) because layer IDs are stored as
 // a byte where 255 is a special value.
-static const int RC_MAX_LAYERS = 63;
-static const int RC_MAX_NEIS = 16;
+#ifndef RC_MAX_LAYERS_DEF
+#define RC_MAX_LAYERS_DEF 63
+#endif
+
+#if RC_MAX_LAYERS_DEF > 255
+#error RC_MAX_LAYERS_DEF must be 255 or smaller
+#endif
+
+#ifndef RC_MAX_NEIS_DEF
+#define RC_MAX_NEIS_DEF 16
+#endif
+
+// Keep type checking.
+static const int RC_MAX_LAYERS = RC_MAX_LAYERS_DEF;
+static const int RC_MAX_NEIS = RC_MAX_NEIS_DEF;
 
 struct rcLayerRegion
 {