line_map.cpp

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#include "line_map.h"
 
#include "line_generator.h"
#include "utils.h"
 
namespace vital {
 
    LineMap::LineMap(LineGenerator* source) : Processor(1, kNumOutputs, true), source_(source) { }
 
    void LineMap::process(int /*num_samples*/) {
        process(input()->at(0));
    }
 
    void LineMap::process(poly_float phase) {
        // Retrieve the line generator's cubic interpolation buffer and resolution.
        mono_float* buffer = source_->getCubicInterpolationBuffer();
        int resolution = source_->resolution();
 
        // Convert the phase into an index into the buffer.
        poly_float boost = utils::clamp(phase * resolution, 0.0f, (mono_float)resolution);
        poly_int indices = utils::clamp(utils::toInt(boost), 0, resolution - 1);
        poly_float t = boost - utils::toFloat(indices);
 
        // Compute interpolation matrices and apply cubic interpolation.
        matrix interpolation_matrix = utils::getPolynomialInterpolationMatrix(t);
        matrix value_matrix = utils::getValueMatrix(buffer, indices);
 
        // Transpose the value matrix to align dimensions for multiplication.
        value_matrix.transpose();
 
        // Perform matrix multiplication to get the interpolated result.
        poly_float result = utils::clamp(interpolation_matrix.multiplyAndSumRows(value_matrix), -1.0f, 1.0f);
 
        // Output the computed value and the original phase.
        output(kValue)->buffer[0] = result;
        output(kPhase)->buffer[0] = phase;
    }
} // namespace vital