Method ScanSong

Source/Compiler.cpp:950–1024

}

void CCompiler::ScanSong()
{
	// Scan and optimize song
	//

	// Re-assign instruments
	m_iAssignedInstruments.clear();		// // //

	// TODO: remove these
	m_bSequencesUsed2A03.fill({ });
	m_bSequencesUsedVRC6.fill({ });
	m_bSequencesUsedN163.fill({ });
	m_bSequencesUsedS5B.fill({ });

	const inst_type_t INST[] = {INST_2A03, INST_VRC6, INST_N163, INST_S5B};		// // //
	decltype(m_bSequencesUsed2A03) *used[] = {&m_bSequencesUsed2A03, &m_bSequencesUsedVRC6, &m_bSequencesUsedN163, &m_bSequencesUsedS5B};

	bool inst_used[MAX_INSTRUMENTS] = { };		// // //

	auto &Im = *m_pModule->GetInstrumentManager();

	// // // Scan patterns in entire module
	m_pModule->VisitSongs([&] (const CSongData &song) {
		int PatternLength = song.GetPatternLength();
		m_ChannelOrder.ForeachChannel([&] (stChannelID j) {
			for (int k = 0; k < MAX_PATTERN; ++k)
				for (int l = 0; l < PatternLength; ++l) {
					const auto &note = song.GetPattern(j, k).GetNoteOn(l);
					if (note.Instrument < std::size(inst_used))		// // //
						inst_used[note.Instrument] = true;
				}
		});
	});

	Im.VisitInstruments([&] (const CInstrument &inst, std::size_t i) {
		if (inst_used[i]) {		// // //
			// List of used instruments
			m_iAssignedInstruments.push_back(i);

			// Create a list of used sequences
			inst_type_t it = Im.GetInstrumentType(i);		// // //
			for (size_t z = 0; z < std::size(used); ++z) if (it == INST[z]) {
				auto pInstrument = static_cast<const CSeqInstrument *>(&inst);
				for (auto j : enum_values<sequence_t>())
					if (pInstrument->GetSeqEnable(j))
						(*used[z])[pInstrument->GetSeqIndex(j)][(unsigned)j] = true;
				break;
			}
		}
	});

	// See which samples are used
	m_iSamplesUsed = 0;

	m_bSamplesAccessed.fill({ });		// // //

	// Get DPCM channel index
	unsigned int Instrument = 0;