sound.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword SOUND
 
@english
 
The ''SOUND'' command add a touch of interactivity and liveliness to your programs. Simply put, 
the ''SOUND'' command allows you to generate sounds directly from your computer. You can
give just the frequency (to start an infinite sound) or a frequency followed by a duration.
You can play multiple sounds by concatenating frequencies or frequencies and durations.
 
By combining several ''SOUND'' commands with different frequencies and durations, you 
can compose short melodies. For example, you can make a sound play when the user presses 
a button or reaches a goal in the game. You can simulate the sounds of explosions, 
gunshots, or any other effect you want. 
 
This command allows you to handle multiple audio channels at the same time, if the
target has them, allowing you to create more complex sounds. The waveform of the sound 
generated can vary depending on the available hardware.
 
@italian
 
Il comando ''SOUND'' aggiunge un tocco di interattività e vivacità ai tuoi programmi. 
In parole povere, il comando ''SOUND'' ti consente di generare suoni direttamente 
dal tuo computer. Puoi fornire solo la frequenza (per avviare un suono infinito) o 
una frequenza seguita da una durata. Puoi riprodurre più suoni concatenando 
frequenze o frequenze e durate.
 
Combinando più comandi ''SOUND'' con frequenze e durate diverse, puoi comporre brevi 
melodie. Ad esempio, puoi far riprodurre un suono quando l'utente preme un pulsante 
o raggiunge un obiettivo nel gioco. Puoi simulare i suoni di esplosioni, spari 
o qualsiasi altro effetto desideri.
 
Questo comando ti consente di gestire più canali audio contemporaneamente, se 
il bersaglio li ha, consentendoti di creare suoni più complessi. La forma d'onda 
del suono generato può variare a seconda dell'hardware disponibile.
 
@syntax SOUND f1[,d1][;f1[,d2][;...]] [ON channels]
 
@example SOUND #440
@example SOUND la;do;mi;sol
@example SOUND #440, #250 ON #%001
 
@target c128
</usermanual> */
void sound( Environment * _environment, int _freq, int _delay, int _channels ) {
 
    sid_start( _environment, _channels );
    sid_set_program( _environment, _channels, IMF_INSTRUMENT_GLOCKENSPIEL );
    sid_set_frequency( _environment, _channels, _freq );
    if ( _delay ) {
        sid_set_duration( _environment, _channels, _delay / 20 /* approx! */ );
        sid_wait_duration( _environment, _channels );        
    }
 
}

void sound_vars( Environment * _environment, char * _freq, char * _delay, char * _channels ) {
 
    Variable * freq = variable_retrieve_or_define( _environment, _freq, VT_WORD, 440 );
    if ( _channels ) {
        Variable * channels = variable_retrieve_or_define( _environment, _channels, VT_WORD, 0x07 );
        sid_start_var( _environment, channels->realName );
        sid_set_program_semi_var( _environment, channels->realName, IMF_INSTRUMENT_GLOCKENSPIEL );
        sid_set_frequency_vars( _environment, channels->realName, freq->realName );
        if ( _delay ) {
            Variable * delay = variable_retrieve_or_define( _environment, _delay, VT_WORD, 0 );
            Variable * durationInTicks = variable_div_const( _environment, delay->name, 20, NULL );
            sid_set_duration_vars( _environment, channels->realName, durationInTicks->realName );
            sid_wait_duration_vars( _environment, channels->realName );
        }
    } else {
        sid_start_var( _environment, NULL );
        sid_set_program_semi_var( _environment, _channels, IMF_INSTRUMENT_GLOCKENSPIEL );
        sid_set_frequency_vars( _environment, NULL, freq->realName );
        if ( _delay ) {
            Variable * delay = variable_retrieve_or_define( _environment, _delay, VT_WORD, 0 );
            Variable * durationInTicks = variable_div_const( _environment, delay->name, 20, NULL );
            sid_set_duration_vars( _environment, NULL, durationInTicks->realName );
            sid_wait_duration_vars( _environment, NULL );
        }
    }
 
}