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#pragma once
#include <mbgl/style/transition_options.hpp>
#include <mbgl/style/conversion/stringify.hpp>
#include <mbgl/renderer/transition_parameters.hpp>
#include <mbgl/renderer/paint_property_binder.hpp>
#include <mbgl/renderer/property_evaluation_parameters.hpp>
#include <mbgl/renderer/transition_parameters.hpp>
#include <mbgl/util/indexed_tuple.hpp>
#include <mbgl/util/ignore.hpp>
namespace mbgl {
class GeometryTileFeature;
namespace style {
template <class Value>
class Transitioning {
public:
Transitioning() = default;
explicit Transitioning(Value value_)
: value(std::move(value_)) {
}
Transitioning(Value value_,
Transitioning<Value> prior_,
TransitionOptions transition,
TimePoint now)
: begin(now + transition.delay.value_or(Duration::zero())),
end(begin + transition.duration.value_or(Duration::zero())),
value(std::move(value_)) {
if (transition.isDefined()) {
prior = { std::move(prior_) };
}
}
template <class Evaluator>
auto evaluate(const Evaluator& evaluator, TimePoint now) const {
auto finalValue = value.evaluate(evaluator);
if (!prior) {
// No prior value.
return finalValue;
} else if (now >= end) {
// Transition from prior value is now complete.
prior = {};
return finalValue;
} else if (value.isDataDriven()) {
// Transitions to data-driven properties are not supported.
// We snap immediately to the data-driven value so that, when we perform layout,
// we see the data-driven function and can use it to populate vertex buffers.
prior = {};
return finalValue;
} else if (now < begin) {
// Transition hasn't started yet.
return prior->get().evaluate(evaluator, now);
} else {
// Interpolate between recursively-calculated prior value and final.
float t = std::chrono::duration<float>(now - begin) / (end - begin);
return util::interpolate(prior->get().evaluate(evaluator, now), finalValue,
util::DEFAULT_TRANSITION_EASE.solve(t, 0.001));
}
}
bool hasTransition() const {
return bool(prior);
}
bool isUndefined() const {
return value.isUndefined();
}
const Value& getValue() const {
return value;
}
private:
mutable optional<mapbox::util::recursive_wrapper<Transitioning<Value>>> prior;
TimePoint begin;
TimePoint end;
Value value;
};
template <class Value>
class Transitionable {
public:
Value value;
TransitionOptions options;
Transitioning<Value> transition(const TransitionParameters& params, Transitioning<Value> prior) const {
return Transitioning<Value>(value,
std::move(prior),
options.reverseMerge(params.transition),
params.now);
}
};
class NoProperties {
public:
class PossiblyEvaluated {};
class Binders {
public:
void populateVertexVectors(const GeometryTileFeature&, std::size_t length);
void upload(gl::Context&);
using Attributes = gl::Attributes<>;
using Uniforms = gl::Uniforms<>;
using AttributeBindings = typename Attributes::Bindings;
using UniformValues = typename Uniforms::Values;
template <class PossiblyEvaluated>
AttributeBindings attributeBindings(const PossiblyEvaluated&) const {
return {};
}
template <class PossiblyEvaluated>
UniformValues uniformValues(float, const PossiblyEvaluated&) const {
return {};
}
};
};
} // namespace style
} // namespace mbgl
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