bitmap_at.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
 ****************************************************************************/
 
#if defined(__vic20__)

/* <usermanual>
@keyword BITMAP AT
@target vic20
</usermanual> */
void bitmap_at( Environment * _environment, int _address ) {
 
    // Let's define the special variable bitmapAddress, and update
    // it with the requested value.
    Variable * bitmapAddress = variable_retrieve( _environment, "BITMAPADDRESS" );
    variable_store( _environment, "BITMAPADDRESS", ( ( _address >> 14 ) & 0x1 ) * 0x2000 );
 
    char addressString[MAX_TEMPORARY_STORAGE]; sprintf(addressString, "#$%2.2x", ( _address >> 8 ) );
 
    vic1_bitmap_at( _environment, addressString );
 
}

void bitmap_at_var( Environment * _environment, char * _address ) {
 
    // Let's define the special variable bitmapAddress, and update
    // it with the requested value.    
    Variable * bitmapAddress = variable_retrieve( _environment, "BITMAPADDRESS" );
    Variable * address = variable_retrieve( _environment, _address );
 
    variable_move_naked( _environment, address->name, bitmapAddress->name );
 
    char addressString[MAX_TEMPORARY_STORAGE]; sprintf(addressString, "%s", address_displacement(_environment, address->realName, "1") );
 
    vic1_bitmap_at( _environment, addressString );
 
}
 
#endif