Method MakePeriodTables

Source/FamiTrackerModule.cpp:194–242

}

CPeriodTables CFamiTrackerModule::MakePeriodTables() const {		// // //
	CPeriodTables table;

	const double A440_NOTE = 45. - GetTuningSemitone() - GetTuningCent() / 100.;
	const double clock_ntsc = MASTER_CLOCK_NTSC / 16.;
	const double clock_pal  = MASTER_CLOCK_PAL / 16.;

	for (int i = 0; i < NOTE_COUNT; ++i) {
		// Frequency (in Hz)
		double Freq = 440. * std::pow(2.0, (i - A440_NOTE) / 12.);
		double Pitch;

		// 2A07
		Pitch = (clock_pal / Freq) - 0.5;
		table.pal_period[i] = (unsigned int)(Pitch - GetDetuneOffset(1, i));		// // //

		// 2A03 / MMC5 / VRC6
		Pitch = (clock_ntsc / Freq) - 0.5;
		table.ntsc_period[i] = (unsigned int)(Pitch - GetDetuneOffset(0, i));		// // //
		table.s5b_period[i] = table.ntsc_period[i] + 1;		// correction

		// VRC6 Saw
		Pitch = ((clock_ntsc * 16.0) / (Freq * 14.0)) - 0.5;
		table.saw_period[i] = (unsigned int)(Pitch - GetDetuneOffset(2, i));		// // //

		// FDS
		Pitch = (Freq * 65536.0) / (clock_ntsc / 1.0) + 0.5;
		table.fds_freq[i] = (unsigned int)(Pitch + GetDetuneOffset(4, i));		// // //

		// N163
		Pitch = ((Freq * GetNamcoChannels() * 983040.0) / clock_ntsc + 0.5) / 4;		// // //
		table.n163_freq[i] = (unsigned int)(Pitch + GetDetuneOffset(5, i));		// // //

		if (table.n163_freq[i] > 0xFFFF)	// 0x3FFFF
			table.n163_freq[i] = 0xFFFF;	// 0x3FFFF

		// // // Sunsoft 5B uses NTSC table

		// // // VRC7
		if (i < NOTE_RANGE) {
			Pitch = Freq * 262144.0 / 49716.0 + 0.5;
			unsigned Reg = (unsigned int)(Pitch + GetDetuneOffset(3, i));
			for (int j = 0; j < OCTAVE_RANGE; ++j)
				table.vrc7_freq[i + j * NOTE_RANGE] = Reg;		// // //
		}
	}

	return table;
}

int CFamiTrackerModule::GetDetuneOffset(int chip, int note) const {		// // //
	return m_iDetuneTable[chip][note];