46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
#include <mitsuba/render/rfilter.h>
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MTS_NAMESPACE_BEGIN
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/**
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* Windowed version of the ideal low-pass filter (with a Lanczos
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* envelope) -- may produce ringing artifacts near sharp edges.
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*/
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class WindowedSincFilter : public ReconstructionFilter {
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public:
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WindowedSincFilter(const Properties &props)
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: ReconstructionFilter(props) {
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/* Half filter size in pixels */
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Float halfSize = props.getFloat("halfSize", 3.0f);
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/* Number of cycles, after which the sinc function should be truncated */
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m_cycles = props.getFloat("cycles", 3.0f);
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m_size = Vector2(halfSize, halfSize);
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}
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WindowedSincFilter(Stream *stream, InstanceManager *manager)
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: ReconstructionFilter(stream, manager) {
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Float halfSize = stream->readFloat();
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m_size = Vector2(halfSize, halfSize);
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m_cycles = stream->readFloat();
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}
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void serialize(Stream *stream, InstanceManager *manager) const {
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ReconstructionFilter::serialize(stream, manager);
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stream->writeFloat(m_size.x);
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stream->writeFloat(m_cycles);
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}
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Float evaluate(Float x, Float y) const {
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return lanczosSinc(x / m_size.x, m_cycles)
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* lanczosSinc(y / m_size.y, m_cycles);
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}
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MTS_DECLARE_CLASS()
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protected:
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Float m_cycles;
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};
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MTS_IMPLEMENT_CLASS_S(WindowedSincFilter, false, ReconstructionFilter);
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MTS_EXPORT_PLUGIN(WindowedSincFilter, "Windowed sinc filter");
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MTS_NAMESPACE_END
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