lookup_table.h

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#pragma once
 
#include "common.h"
#include "poly_utils.h"
 
namespace vital {
 
    template<mono_float(*function)(mono_float), size_t resolution>
    class OneDimLookup {
        static constexpr int kExtraValues = 4; 
    public:
        OneDimLookup(float scale = 1.0f) {
            scale_ = resolution / scale;
            for (int i = 0; i < static_cast<int>(resolution) + kExtraValues; ++i) {
                mono_float t = (i - 1.0f) / (resolution - 1.0f);
                lookup_[i] = function(t * scale);
            }
        }
 
        ~OneDimLookup() { }
 
        force_inline poly_float cubicLookup(poly_float value) const {
            poly_float boost = value * scale_;
            poly_int indices = utils::clamp(utils::toInt(boost), 0, static_cast<int>(resolution));
            poly_float t = boost - utils::toFloat(indices);
 
            matrix interpolation_matrix = utils::getCatmullInterpolationMatrix(t);
            matrix value_matrix = utils::getValueMatrix(lookup_, indices);
            value_matrix.transpose();
 
            return interpolation_matrix.multiplyAndSumRows(value_matrix);
        }
 
    private:
        mono_float lookup_[resolution + kExtraValues]; 
        mono_float scale_;                             
 
        JUCE_LEAK_DETECTOR(OneDimLookup)
    };
 
} // namespace vital