boom.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
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 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword BOOM
@target cpc
</usermanual> */
void boom( Environment * _environment, int _duration, int _channels ) {
 
    _channels = 0x08; // noise channel!
 
    ay8910_start( _environment, ( _channels & 0x07 ) );
    ay8910_set_frequency( _environment, _channels, 1000 );
 
    long durationInTicks = ( _duration / 20 ) & 0xff;
 
    ay8910_set_duration( _environment, _channels, durationInTicks );
 
    if ( ! _environment->audioConfig.async ) {
        ay8910_wait_duration( _environment, _channels );
    }
 
}

/* <usermanual>
@keyword BOOM
@target cpc
</usermanual> */
void boom_var( Environment * _environment, char * _duration, char * _channels ) {
 
    Variable * noiseChannel = variable_temporary( _environment, VT_BYTE, "(channel)" );
    variable_store( _environment, noiseChannel->name, 0x08 ); // noise channel!
 
    ay8910_start_var( _environment, noiseChannel->realName );
 
    if ( _duration ) {
        Variable * duration = variable_retrieve_or_define( _environment, noiseChannel->realName, VT_WORD, 0x07 );
        Variable * durationInTicks = variable_div_const( _environment, duration->name, 20, NULL );
        ay8910_set_duration_vars( _environment, noiseChannel->realName, durationInTicks->realName );
    } else {
        ay8910_set_duration_vars( _environment, noiseChannel->realName, NULL );
    } 
 
    if ( ! _environment->audioConfig.async ) {
        ay8910_wait_duration_vars( _environment, noiseChannel->realName );
    }
 
}