[core] Add `FadingTiles` layer type property

12 files changed, 29 insertions, 11 deletions

diff --git a/include/mbgl/style/layer.hpp b/include/mbgl/style/layer.hpp
index c526182033..ab98d978ac 100644
--- a/include/mbgl/style/layer.hpp
+++ b/include/mbgl/style/layer.hpp
@@ -49,6 +49,12 @@ struct LayerTypeInfo {
      * requires clipping. Contains \c Clipping::NotRequired otherwise.
      */
     const enum class Clipping { Required, NotRequired } clipping;
+
+    /**
+     * @brief contains \c FadingTiles::Required if the corresponding layer type
+     * requires rendering on fading tiles. Contains \c FadingTiles::NotRequired otherwise.
+     */
+    const enum class FadingTiles { Required, NotRequired } fadingTiles;
 };
 
 /**
diff --git a/src/mbgl/style/layers/background_layer.cpp b/src/mbgl/style/layers/background_layer.cpp
index 8d2b1b144b..530c3ce6bf 100644
--- a/src/mbgl/style/layers/background_layer.cpp
+++ b/src/mbgl/style/layers/background_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* BackgroundLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::NotRequired,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::NotRequired,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/circle_layer.cpp b/src/mbgl/style/layers/circle_layer.cpp
index f2e3649c5a..2759549e1c 100644
--- a/src/mbgl/style/layers/circle_layer.cpp
+++ b/src/mbgl/style/layers/circle_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* CircleLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::NotRequired,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/custom_layer.cpp b/src/mbgl/style/layers/custom_layer.cpp
index 90c65193d5..ba818d953d 100644
--- a/src/mbgl/style/layers/custom_layer.cpp
+++ b/src/mbgl/style/layers/custom_layer.cpp
@@ -13,7 +13,8 @@ namespace {
       LayerTypeInfo::Source::NotRequired,
       LayerTypeInfo::Pass3D::NotRequired,
       LayerTypeInfo::Layout::NotRequired,
-      LayerTypeInfo::Clipping::NotRequired };
+      LayerTypeInfo::Clipping::NotRequired,
+      LayerTypeInfo::FadingTiles::NotRequired };
 }  // namespace
 
 CustomLayer::CustomLayer(const std::string& layerID,
diff --git a/src/mbgl/style/layers/fill_extrusion_layer.cpp b/src/mbgl/style/layers/fill_extrusion_layer.cpp
index 913f8e3127..89796f098c 100644
--- a/src/mbgl/style/layers/fill_extrusion_layer.cpp
+++ b/src/mbgl/style/layers/fill_extrusion_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* FillExtrusionLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::Required,
           LayerTypeInfo::Layout::Required,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/fill_layer.cpp b/src/mbgl/style/layers/fill_layer.cpp
index afcb2cae37..0511e06828 100644
--- a/src/mbgl/style/layers/fill_layer.cpp
+++ b/src/mbgl/style/layers/fill_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* FillLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::Required,
-          LayerTypeInfo::Clipping::Required
+          LayerTypeInfo::Clipping::Required,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/heatmap_layer.cpp b/src/mbgl/style/layers/heatmap_layer.cpp
index 9e0fe93557..7d23d86f15 100644
--- a/src/mbgl/style/layers/heatmap_layer.cpp
+++ b/src/mbgl/style/layers/heatmap_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* HeatmapLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::Required,
           LayerTypeInfo::Layout::NotRequired,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/hillshade_layer.cpp b/src/mbgl/style/layers/hillshade_layer.cpp
index ac26e331fc..dacd639f52 100644
--- a/src/mbgl/style/layers/hillshade_layer.cpp
+++ b/src/mbgl/style/layers/hillshade_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* HillshadeLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::Required,
           LayerTypeInfo::Layout::NotRequired,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/layer.cpp.ejs b/src/mbgl/style/layers/layer.cpp.ejs
index 107c3cb527..dac4529d39 100644
--- a/src/mbgl/style/layers/layer.cpp.ejs
+++ b/src/mbgl/style/layers/layer.cpp.ejs
@@ -25,7 +25,8 @@ let layerCapabilities = {};
 let defaults = { caps: { 'Source':   'NotRequired',
                          'Pass3D':   'NotRequired',
                          'Layout':   'NotRequired',
-                         'Clipping': 'NotRequired'
+                         'Clipping': 'NotRequired',
+                         'FadingTiles': 'NotRequired'
                  },
                  require: function(cap) {
                              let copy = Object.assign({}, this);
@@ -55,6 +56,7 @@ layerCapabilities['hillshade']      = defaults.require('Source')
                                               .finalize();
 layerCapabilities['symbol']         = defaults.require('Source')
                                               .require('Layout')
+                                              .require('FadingTiles')
                                               .finalize();
 layerCapabilities['circle']         = defaults.require('Source').finalize();
 layerCapabilities['line']           = layerCapabilities['fill'];
diff --git a/src/mbgl/style/layers/line_layer.cpp b/src/mbgl/style/layers/line_layer.cpp
index d52a552605..d50ae27098 100644
--- a/src/mbgl/style/layers/line_layer.cpp
+++ b/src/mbgl/style/layers/line_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* LineLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::Required,
-          LayerTypeInfo::Clipping::Required
+          LayerTypeInfo::Clipping::Required,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/raster_layer.cpp b/src/mbgl/style/layers/raster_layer.cpp
index dc7dd4a74f..784b720c68 100644
--- a/src/mbgl/style/layers/raster_layer.cpp
+++ b/src/mbgl/style/layers/raster_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* RasterLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::NotRequired,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::NotRequired
         };
     return &typeInfo;
 }
diff --git a/src/mbgl/style/layers/symbol_layer.cpp b/src/mbgl/style/layers/symbol_layer.cpp
index 0284ba0d3c..0567c224bd 100644
--- a/src/mbgl/style/layers/symbol_layer.cpp
+++ b/src/mbgl/style/layers/symbol_layer.cpp
@@ -23,7 +23,8 @@ const LayerTypeInfo* SymbolLayer::Impl::staticTypeInfo() noexcept {
           LayerTypeInfo::Source::Required,
           LayerTypeInfo::Pass3D::NotRequired,
           LayerTypeInfo::Layout::Required,
-          LayerTypeInfo::Clipping::NotRequired
+          LayerTypeInfo::Clipping::NotRequired,
+          LayerTypeInfo::FadingTiles::Required
         };
     return &typeInfo;
 }