[core] add constant DDS values as uniforms

3 files changed, 23 insertions, 4 deletions

diff --git a/src/mbgl/programs/program.hpp b/src/mbgl/programs/program.hpp
index 7eec15e755..420d2e1397 100644
--- a/src/mbgl/programs/program.hpp
+++ b/src/mbgl/programs/program.hpp
@@ -62,7 +62,7 @@ public:
             std::move(stencilMode),
             std::move(colorMode),
             uniformValues
-                .concat(paintPropertyBinders.uniformValues(currentZoom)),
+                .concat(paintPropertyBinders.uniformValues(currentZoom, currentProperties)),
             LayoutAttributes::allVariableBindings(layoutVertexBuffer)
                 .concat(paintPropertyBinders.attributeBindings(currentProperties)),
             indexBuffer,
diff --git a/src/mbgl/programs/symbol_program.hpp b/src/mbgl/programs/symbol_program.hpp
index 46f532e5c4..1b7232c9e4 100644
--- a/src/mbgl/programs/symbol_program.hpp
+++ b/src/mbgl/programs/symbol_program.hpp
@@ -377,7 +377,7 @@ public:
             std::move(colorMode),
             uniformValues
                 .concat(symbolSizeBinder.uniformValues(currentZoom))
-                .concat(paintPropertyBinders.uniformValues(currentZoom)),
+                .concat(paintPropertyBinders.uniformValues(currentZoom, currentProperties)),
             LayoutAttributes::allVariableBindings(layoutVertexBuffer)
                 .concat(symbolSizeBinder.attributeBindings(currentSizeValue))
                 .concat(paintPropertyBinders.attributeBindings(currentProperties)),
diff --git a/src/mbgl/renderer/paint_property_binder.hpp b/src/mbgl/renderer/paint_property_binder.hpp
index 3e53bcc884..a4bea24bbf 100644
--- a/src/mbgl/renderer/paint_property_binder.hpp
+++ b/src/mbgl/renderer/paint_property_binder.hpp
@@ -88,6 +88,7 @@ public:
     virtual void upload(gl::Context& context) = 0;
     virtual AttributeBinding attributeBinding(const PossiblyEvaluatedPropertyValue<T>& currentValue) const = 0;
     virtual float interpolationFactor(float currentZoom) const = 0;
+    virtual T uniformValue(const PossiblyEvaluatedPropertyValue<T>& currentValue) const = 0;
 
     static std::unique_ptr<PaintPropertyBinder> create(const PossiblyEvaluatedPropertyValue<T>& value, float zoom, T defaultValue);
 
@@ -118,6 +119,10 @@ public:
         return 0.0f;
     }
 
+    T uniformValue(const PossiblyEvaluatedPropertyValue<T>& currentValue) const override {
+        return currentValue.constantOr(constant);
+    }
+
 private:
     T constant;
 };
@@ -165,6 +170,11 @@ public:
         return 0.0f;
     }
 
+    T uniformValue(const PossiblyEvaluatedPropertyValue<T>&) const override {
+        // Uniform values for vertex attribute arrays are unused.
+        return {};
+    }
+
 private:
     style::SourceFunction<T> function;
     T defaultValue;
@@ -220,6 +230,11 @@ public:
         return util::interpolationFactor(1.0f, std::get<0>(coveringRanges), currentZoom);
     }
 
+    T uniformValue(const PossiblyEvaluatedPropertyValue<T>&) const override {
+        // Uniform values for vertex attribute arrays are unused.
+        return {};
+    }
+
 private:
     using InnerStops = typename style::CompositeFunction<T>::InnerStops;
     style::CompositeFunction<T> function;
@@ -306,14 +321,18 @@ public:
         };
     }
 
-    using Uniforms = gl::Uniforms<InterpolationUniform<typename Ps::Attribute>...>;
+    using Uniforms = gl::Uniforms<InterpolationUniform<typename Ps::Attribute>..., typename Ps::Uniform...>;
     using UniformValues = typename Uniforms::Values;
 
-    UniformValues uniformValues(float currentZoom) const {
+    template <class EvaluatedProperties>
+    UniformValues uniformValues(float currentZoom, const EvaluatedProperties& currentProperties) const {
         (void)currentZoom; // Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56958
         return UniformValues {
             typename InterpolationUniform<typename Ps::Attribute>::Value {
                 binders.template get<Ps>()->interpolationFactor(currentZoom)
+            }...,
+            typename Ps::Uniform::Value {
+                binders.template get<Ps>()->uniformValue(currentProperties.template get<Ps>())
             }...
         };
     }