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.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
 * Concesso in licenza secondo i termini della Licenza Apache, versione 2.0
 * (la "Licenza"); è proibito usare questo file se non in conformità alla
 * Licenza. Una copia della Licenza è disponibile all'indirizzo:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
 * "COSÌ COM'È", SENZA GARANZIE O CONDIZIONI DI ALCUN TIPO, esplicite o
 * implicite. Consultare la Licenza per il testo specifico che regola le
 * autorizzazioni e le limitazioni previste dalla medesima.
 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword SOUND
@target coleco
</usermanual> */
void sound( Environment * _environment, int _freq, int _delay, int _channels ) {
 
    sn76489z_start( _environment, _channels );
    sn76489z_set_frequency( _environment, _channels, _freq );
    if ( _delay ) {
        sn76489z_set_duration( _environment, _channels, _delay / 20 /* approx! */ );
        sn76489z_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 );
        sn76489z_start_var( _environment, channels->realName );
        sn76489z_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 );
            sn76489z_set_duration_vars( _environment, channels->realName, durationInTicks->realName );
            sn76489z_wait_duration_vars( _environment, channels->realName );
        }
    } else {
        sn76489z_start_var( _environment, NULL );
        sn76489z_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 );
            sn76489z_set_duration_vars( _environment, NULL, durationInTicks->realName );
            sn76489z_wait_duration_vars( _environment, NULL );
        }
    }
 
}