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import { SpessaSynthInfo } from "./loggin.js";
import { consoleColors } from "./other.js";
import { DEFAULT_PERCUSSION } from "../synthetizer/synth_constants.js";
export const XG_SFX_VOICE = 64;
const GM2_DEFAULT_BANK = 121;
/**
* @param sys {SynthSystem}
* @returns {number}
*/
export function getDefaultBank(sys)
{
return sys === "gm2" ? GM2_DEFAULT_BANK : 0;
}
/**
* @param bankNr {number}
* @returns {boolean}
*/
export function isXGDrums(bankNr)
{
return bankNr === 120 || bankNr === 126 || bankNr === 127;
}
/**
* @param bank {number}
* @returns {boolean}
*/
export function isValidXGMSB(bank)
{
return isXGDrums(bank) || bank === XG_SFX_VOICE || bank === GM2_DEFAULT_BANK;
}
/**
* Bank select hacks abstracted here
* @param bankBefore {number} the current bank number
* @param bank {number} the cc change bank number
* @param system {SynthSystem} MIDI system
* @param isLSB {boolean} is bank LSB?
* @param isDrums {boolean} is drum channel?
* @param channelNumber {number} channel number
* @returns {{
* newBank: number,
* drumsStatus: 0|1|2
* }} 0 - unchanged, 1 - OFF, 2 - ON
*/
export function parseBankSelect(bankBefore, bank, system, isLSB, isDrums, channelNumber)
{
// 64 means SFX in MSB, so it is allowed
let out = bankBefore;
let drumsStatus = 0;
if (isLSB)
{
if (isSystemXG(system))
{
if (!isValidXGMSB(bank))
{
out = bank;
}
}
else if (system === "gm2")
{
out = bank;
}
}
else
{
let canSetBankSelect = true;
switch (system)
{
case "gm":
// gm ignores bank select
SpessaSynthInfo(
`%cIgnoring the Bank Select (${bank}), as the synth is in GM mode.`,
consoleColors.info
);
canSetBankSelect = false;
break;
case "xg":
canSetBankSelect = isValidXGMSB(bank);
// for xg, if msb is 120, 126 or 127, then it's drums
if (isXGDrums(bank))
{
drumsStatus = 2;
}
else
{
// drums shall not be disabled on channel 9
if (channelNumber % 16 !== DEFAULT_PERCUSSION)
{
drumsStatus = 1;
}
}
break;
case "gm2":
if (bank === 120)
{
drumsStatus = 2;
}
else
{
if (channelNumber % 16 !== DEFAULT_PERCUSSION)
{
drumsStatus = 1;
}
}
}
if (isDrums)
{
// 128 for percussion channel
bank = 128;
}
if (bank === 128 && !isDrums)
{
// if a channel is not for percussion, default to bank current
bank = bankBefore;
}
if (canSetBankSelect)
{
out = bank;
}
}
return {
newBank: out,
drumsStatus: drumsStatus
};
}
/**
* Chooses a bank number according to spessasynth logic
* That is:
* for GS, bank MSB if not drum, otherwise 128
* for XG: bank MSB if drum and MSB is valid, 128 othewise, bank MSB if it is SFX voice, LSB otherwise
* @param msb {number}
* @param lsb {number}
* @param isDrums {boolean}
* @param isXG {boolean}
* @returns {number}
*/
export function chooseBank(msb, lsb, isDrums, isXG)
{
if (isXG)
{
if (isDrums)
{
if (isXGDrums(msb))
{
return msb;
}
else
{
return 128;
}
}
else
{
// check for SFX
if (isValidXGMSB(msb))
{
return msb;
}
// if lsb is 0 and msb is not, use that
if (lsb === 0 && msb !== 0)
{
return msb;
}
if (!isValidXGMSB(lsb))
{
return lsb;
}
return 0;
}
}
else
{
return isDrums ? 128 : msb;
}
}
/**
* @param system {SynthSystem}
* @returns boolean
*/
export function isSystemXG(system)
{
return system === "gm2" || system === "xg";
} |