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#pragma once
#include <mbgl/programs/attributes.hpp>
#include <mbgl/gl/attribute.hpp>
#include <mbgl/gl/uniform.hpp>
#include <mbgl/util/type_list.hpp>
namespace mbgl {
namespace style {
template <class T, class A>
class ConstantPaintPropertyBinder {
public:
using BaseAttribute = A;
using BaseAttributeValue = typename BaseAttribute::Value;
using BaseAttributeBinding = typename BaseAttribute::Binding;
using Attribute = attributes::ZoomInterpolatedAttribute<BaseAttribute>;
using AttributeBinding = typename Attribute::Binding;
ConstantPaintPropertyBinder(T constant_)
: constant(std::move(constant_)) {
}
void populateVertexVector(const GeometryTileFeature&, std::size_t) {}
void upload(gl::Context&) {}
AttributeBinding attributeBinding(const PossiblyEvaluatedPropertyValue<T>& currentValue) const {
auto val = currentValue.constantOr(constant);
return typename Attribute::ConstantBinding {
Attribute::value(val, val)
};
}
float interpolationFactor(float) const {
return 0.0f;
}
private:
T constant;
};
template <class T, class A>
class SourceFunctionPaintPropertyBinder {
public:
using BaseAttribute = A;
using BaseAttributeValue = typename BaseAttribute::Value;
using BaseAttributeBinding = typename BaseAttribute::Binding;
using BaseVertex = typename gl::Attributes<BaseAttribute>::Vertex;
using Attribute = attributes::ZoomInterpolatedAttribute<BaseAttribute>;
using AttributeBinding = typename Attribute::Binding;
SourceFunctionPaintPropertyBinder(SourceFunction<T> function_, T defaultValue_)
: function(std::move(function_)),
defaultValue(std::move(defaultValue_)) {
}
void populateVertexVector(const GeometryTileFeature& feature, std::size_t length) {
auto val = function.evaluate(feature, defaultValue);
BaseAttributeValue value = BaseAttribute::value(val);
for (std::size_t i = vertexVector.vertexSize(); i < length; ++i) {
vertexVector.emplace_back(BaseVertex { value });
}
}
void upload(gl::Context& context) {
vertexBuffer = context.createVertexBuffer(std::move(vertexVector));
}
AttributeBinding attributeBinding(const PossiblyEvaluatedPropertyValue<T>& currentValue) const {
if (currentValue.isConstant()) {
auto val = *currentValue.constant();
return typename Attribute::ConstantBinding {
Attribute::value(val, val)
};
} else {
return Attribute::variableBinding(*vertexBuffer, 0, BaseAttribute::Dimensions);
}
}
float interpolationFactor(float) const {
return 0.0f;
}
private:
SourceFunction<T> function;
T defaultValue;
gl::VertexVector<BaseVertex> vertexVector;
optional<gl::VertexBuffer<BaseVertex>> vertexBuffer;
};
template <class T, class A>
class CompositeFunctionPaintPropertyBinder {
public:
using Attribute = attributes::ZoomInterpolatedAttribute<A>;
using AttributeValue = typename Attribute::Value;
using AttributeBinding = typename Attribute::Binding;
using Vertex = typename gl::Attributes<Attribute>::Vertex;
CompositeFunctionPaintPropertyBinder(CompositeFunction<T> function_, float zoom, T defaultValue_)
: function(std::move(function_)),
defaultValue(std::move(defaultValue_)),
coveringRanges(function.coveringRanges(zoom)) {
}
void populateVertexVector(const GeometryTileFeature& feature, std::size_t length) {
Range<T> range = function.evaluate(std::get<1>(coveringRanges), feature, defaultValue);
AttributeValue minMax = Attribute::value(range.min, range.max);
for (std::size_t i = vertexVector.vertexSize(); i < length; ++i) {
vertexVector.emplace_back(Vertex { minMax });
}
}
void upload(gl::Context& context) {
vertexBuffer = context.createVertexBuffer(std::move(vertexVector));
}
AttributeBinding attributeBinding(const PossiblyEvaluatedPropertyValue<T>& currentValue) const {
if (currentValue.isConstant()) {
auto val = *currentValue.constant();
return typename Attribute::ConstantBinding {
Attribute::value(val, val)
};
} else {
return Attribute::variableBinding(*vertexBuffer, 0);
}
}
float interpolationFactor(float currentZoom) const {
return util::interpolationFactor(1.0f, std::get<0>(coveringRanges), currentZoom);
}
private:
using InnerStops = typename CompositeFunction<T>::InnerStops;
CompositeFunction<T> function;
T defaultValue;
std::tuple<Range<float>, Range<InnerStops>> coveringRanges;
gl::VertexVector<Vertex> vertexVector;
optional<gl::VertexBuffer<Vertex>> vertexBuffer;
};
template <class PaintProperty>
class PaintPropertyBinder {
public:
using Type = typename PaintProperty::Type;
using PropertyValue = typename PaintProperty::EvaluatedType;
using BaseAttribute = typename PaintProperty::Attribute;
using Attribute = attributes::ZoomInterpolatedAttribute<BaseAttribute>;
using AttributeBinding = typename Attribute::Binding;
using Binder = variant<
ConstantPaintPropertyBinder<Type, BaseAttribute>,
SourceFunctionPaintPropertyBinder<Type, BaseAttribute>,
CompositeFunctionPaintPropertyBinder<Type, BaseAttribute>>;
PaintPropertyBinder(const PropertyValue& value, float zoom)
: binder(value.match(
[&] (const Type& constant) -> Binder {
return ConstantPaintPropertyBinder<Type, BaseAttribute>(constant);
},
[&] (const SourceFunction<Type>& function) {
return SourceFunctionPaintPropertyBinder<Type, BaseAttribute>(function, PaintProperty::defaultValue());
},
[&] (const CompositeFunction<Type>& function) {
return CompositeFunctionPaintPropertyBinder<Type, BaseAttribute>(function, zoom, PaintProperty::defaultValue());
}
)) {
}
void populateVertexVector(const GeometryTileFeature& feature, std::size_t length) {
binder.match([&] (auto& b) {
b.populateVertexVector(feature, length);
});
}
void upload(gl::Context& context) {
binder.match([&] (auto& b) {
b.upload(context);
});
}
AttributeBinding attributeBinding(const PropertyValue& currentValue) const {
return binder.match([&] (const auto& b) {
return b.attributeBinding(currentValue);
});
}
using InterpolationUniform = attributes::InterpolationUniform<Attribute>;
using InterpolationUniformValue = typename InterpolationUniform::Value;
InterpolationUniformValue interpolationUniformValue(float currentZoom) const {
return InterpolationUniformValue {
binder.match([&] (const auto& b) {
return b.interpolationFactor(currentZoom);
})
};
}
private:
Binder binder;
};
template <class Ps>
class PaintPropertyBinders;
template <class... Ps>
class PaintPropertyBinders<TypeList<Ps...>> {
public:
using Binders = IndexedTuple<TypeList<Ps...>, TypeList<PaintPropertyBinder<Ps>...>>;
template <class EvaluatedProperties>
PaintPropertyBinders(const EvaluatedProperties& properties, float z)
: binders(PaintPropertyBinder<Ps>(properties.template get<Ps>(), z)...) {
(void)z; // Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56958
}
void populateVertexVectors(const GeometryTileFeature& feature, std::size_t length) {
util::ignore({
(binders.template get<Ps>().populateVertexVector(feature, length), 0)...
});
}
void upload(gl::Context& context) {
util::ignore({
(binders.template get<Ps>().upload(context), 0)...
});
}
using Attributes = gl::Attributes<typename PaintPropertyBinder<Ps>::Attribute...>;
using AttributeBindings = typename Attributes::Bindings;
template <class EvaluatedProperties>
AttributeBindings attributeBindings(const EvaluatedProperties& currentProperties) const {
return typename Attributes::Bindings {
binders.template get<Ps>().attributeBinding(currentProperties.template get<Ps>())...
};
}
using Uniforms = gl::Uniforms<typename PaintPropertyBinder<Ps>::InterpolationUniform...>;
using UniformValues = typename Uniforms::Values;
UniformValues uniformValues(float currentZoom) const {
(void)currentZoom; // Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56958
return UniformValues {
binders.template get<Ps>().interpolationUniformValue(currentZoom)...
};
}
private:
Binders binders;
};
} // namespace style
} // namespace mbgl
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