pineforge-engine/src/math.cpp at main · pineforge-4pass/pineforge-engine · GitHub

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#include <pineforge/math.hpp>

namespace pineforge {

namespace math {

Sum::Sum(int length)

: length_(length), sum_(0.0), saved_sum_(0.0),

has_saved_state_(false), current_value_added_(false),

current_value_evicted_(false), current_evicted_value_(0.0) {}

double Sum::apply(double src) {

current_value_added_ = false;

current_value_evicted_ = false;

if (is_na(src)) {

// Pine ignores na sources rather than consuming a window slot. Once

// seeded, the last-N-valid sum is therefore held on na-input bars.

if (length_ > 0 && static_cast<int>(buffer_.size()) >= length_) {

return sum_;

}

return na<double>();

}

buffer_.push_back(src);

sum_ += src;

current_value_added_ = true;

while ((int)buffer_.size() > length_) {

current_value_evicted_ = true;

current_evicted_value_ = buffer_.front();

sum_ -= buffer_.front();

buffer_.pop_front();

}

if (static_cast<int>(buffer_.size()) < length_) {

return na<double>();

}

return sum_;

}

void Sum::restore() {

if (current_value_added_ && length_ > 0) {

buffer_.pop_back();

if (current_value_evicted_) {

buffer_.push_front(current_evicted_value_);

}

sum_ = saved_sum_;

current_value_added_ = false;

current_value_evicted_ = false;

}

double Sum::compute(double src) {

saved_sum_ = sum_;

has_saved_state_ = true;

return apply(src);

}

double Sum::recompute(double src) {

if (!has_saved_state_) {

return compute(src);

}

restore();

return apply(src);

}

} // namespace math

} // namespace pineforge

pineforge-engine/src/math.cpp at main · pineforge-4pass/pineforge-engine · GitHub

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