From c1445913220023fdaf8ec5960eb6cba27c348864 Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Thu, 27 Jun 2019 17:06:49 +0300
Subject: [core] Introduce LayerProperties::constantsMask()

Constants mask for data-driven paint properties is a reliable
criteria of whether the given updated properties can still be used
with the existing bucket (and the gl program instance).
---
 include/mbgl/style/layer_properties.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/mbgl/style/layer_properties.hpp b/include/mbgl/style/layer_properties.hpp
index 301a048e50..c238faf02f 100644
--- a/include/mbgl/style/layer_properties.hpp
+++ b/include/mbgl/style/layer_properties.hpp
@@ -13,7 +13,8 @@ namespace style {
 class LayerProperties {
 public:
     virtual ~LayerProperties() = default;
-
+    // Returns constants mask for the data-driven properties.
+    virtual unsigned long constantsMask() const { return 0u; }
     Immutable<Layer::Impl> baseImpl;
 
 protected:
-- 
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