[build] change special casing for LineFloorWidth in shader generation

scripts/generate-style-code.js

@@ -92,6 +92,7 @@ function attributeUniformType(property, type) {
       'icon-halo-width': ['halo_width'],
       'line-gap-width': ['gapwidth'],
       'line-pattern': ['pattern_to', 'pattern_from'],
+      'line-floor-width': ['floorwidth'],
       'fill-pattern': ['pattern_to', 'pattern_from'],
       'fill-extrusion-pattern': ['pattern_to', 'pattern_from']
     }
@@ -196,6 +197,14 @@ const layerCpp = ejs.compile(fs.readFileSync('src/mbgl/style/layers/layer.cpp.ej
 const propertiesHpp = ejs.compile(fs.readFileSync('src/mbgl/style/layers/layer_properties.hpp.ejs', 'utf8'), {strict: true});
 const propertiesCpp = ejs.compile(fs.readFileSync('src/mbgl/style/layers/layer_properties.cpp.ejs', 'utf8'), {strict: true});
 
+// Add this mock property that our SDF line shader needs so that it gets added to the list of
+// "data driven" properties.
+spec.paint_line['line-floor-width'] = {
+  "type": "number",
+  "default": 1,
+  "property-type": "data-driven"
+};
+
 const layers = Object.keys(spec.layer.type.values).map((type) => {
   const layoutProperties = Object.keys(spec[`layout_${type}`]).reduce((memo, name) => {
     if (name !== 'visibility') {
@@ -224,11 +233,16 @@ const layers = Object.keys(spec.layer.type.values).map((type) => {
 for (const layer of layers) {
   const layerFileName = layer.type.replace('-', '_');
 
-  writeIfModified(`include/mbgl/style/layers/${layerFileName}_layer.hpp`, layerHpp(layer));
-  writeIfModified(`src/mbgl/style/layers/${layerFileName}_layer.cpp`, layerCpp(layer));
-
   writeIfModified(`src/mbgl/style/layers/${layerFileName}_layer_properties.hpp`, propertiesHpp(layer));
   writeIfModified(`src/mbgl/style/layers/${layerFileName}_layer_properties.cpp`, propertiesCpp(layer));
+
+  // Remove our fake property for the external interace.
+  if (layer.type === 'line') {
+    layer.paintProperties = layer.paintProperties.filter(property => property.name !== 'line-floor-width');
+  }
+
+  writeIfModified(`include/mbgl/style/layers/${layerFileName}_layer.hpp`, layerHpp(layer));
+  writeIfModified(`src/mbgl/style/layers/${layerFileName}_layer.cpp`, layerCpp(layer));
 }
 
 // Light

src/mbgl/style/layers/layer_properties.hpp.ejs

@@ -33,19 +33,15 @@ struct <%- camelize(property.name) %> : ColorRampProperty {
 <%   } else { -%>
 struct <%- camelize(property.name) %> : <%- paintPropertyType(property, type) %> {
     static <%- evaluatedType(property) %> defaultValue() { return <%- defaultValue(property) %>; }
+<% if (property.name === 'line-floor-width') { -%>
+    using EvaluatorType = DataDrivenPropertyEvaluator<float, true>;
+<% } -%>
 <% if (isOverridable(property)) { -%>
     static constexpr const char *name() { return "<%- property.name %>"; }
     static constexpr auto expressionType() { return expression::type::<%- expressionType(property) %>{}; };
     template<typename T> static bool hasOverride(const T& t) { return !!t.<%- camelizeWithLeadingLowercase(property.name) %>; };
 <% } -%>
 };
-<% if (property.name === 'line-width') { -%>
-
-struct LineFloorWidth : DataDrivenPaintProperty<float, attributes::floorwidth, uniforms::floorwidth> {
-    using EvaluatorType = DataDrivenPropertyEvaluator<float, true>;
-    static float defaultValue() { return 1.0f; }
-};
-<% } -%>
 <%   } -%>
 
 <% } -%>
@@ -61,9 +57,6 @@ class <%- camelize(type) %>LayoutProperties : public Properties<
 class <%- camelize(type) %>PaintProperties : public Properties<
 <% for (const property of paintProperties.slice(0, -1)) { -%>
     <%- camelize(property.name) %>,
-<% if (property.name === 'line-width') { -%>
-    LineFloorWidth,
-<% } -%>
 <% } -%>
     <%- camelize(paintProperties.slice(-1)[0].name) %>
 > {};

src/mbgl/style/layers/line_layer_properties.hpp

@@ -54,11 +54,6 @@ struct LineWidth : DataDrivenPaintProperty<float, attributes::width, uniforms::w
     static float defaultValue() { return 1; }
 };
 
-struct LineFloorWidth : DataDrivenPaintProperty<float, attributes::floorwidth, uniforms::floorwidth> {
-    using EvaluatorType = DataDrivenPropertyEvaluator<float, true>;
-    static float defaultValue() { return 1.0f; }
-};
-
 struct LineGapWidth : DataDrivenPaintProperty<float, attributes::gapwidth, uniforms::gapwidth> {
     static float defaultValue() { return 0; }
 };
@@ -82,6 +77,11 @@ struct LinePattern : CrossFadedDataDrivenPaintProperty<std::string, attributes::
 struct LineGradient : ColorRampProperty {
 };
 
+struct LineFloorWidth : DataDrivenPaintProperty<float, attributes::floorwidth, uniforms::floorwidth> {
+    static float defaultValue() { return 1; }
+    using EvaluatorType = DataDrivenPropertyEvaluator<float, true>;
+};
+
 class LineLayoutProperties : public Properties<
     LineCap,
     LineJoin,
@@ -95,13 +95,13 @@ class LinePaintProperties : public Properties<
     LineTranslate,
     LineTranslateAnchor,
     LineWidth,
-    LineFloorWidth,
     LineGapWidth,
     LineOffset,
     LineBlur,
     LineDasharray,
     LinePattern,
-    LineGradient
+    LineGradient,
+    LineFloorWidth
 > {};
 
 class LineLayerProperties final : public LayerProperties {