colormap_clear.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
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 * 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 COLORMAP CLEAR
@target c64
</usermanual> */
void colormap_clear_with( Environment * _environment, int _foreground, int _background ) {
 
    
 
    Variable * colormapAddress = variable_retrieve_or_define( _environment, "COLORMAPADDRESS", VT_ADDRESS, 0x8400 );
 
    char value[MAX_TEMPORARY_STORAGE]; sprintf(value, "#$%2.2x", ( ( _foreground & 0x0f ) << 4 ) | ( _background & 0x0f ));
    
    cpu_fill_blocks( _environment, colormapAddress->realName, "#$04", value );
 
}

/* <usermanual>
@keyword COLORMAP CLEAR
</usermanual> */
void colormap_clear_with_vars( Environment * _environment, char * _foreground, char * _background ) {
 
    Variable * colormapAddress = variable_retrieve_or_define( _environment, "COLORMAPADDRESS", VT_ADDRESS, 0x8400 );
 
    Variable * foreground = variable_retrieve( _environment, _foreground );
 
    Variable * background = variable_retrieve( _environment, _background );
 
    cpu_combine_nibbles( _environment, background->realName, foreground->realName, "$24" );
 
    cpu_fill_blocks( _environment, colormapAddress->realName, "#$04", "$24" );
 
}

/* <usermanual>
@keyword COLORMAP CLEAR
</usermanual> */
void colormap_clear( Environment * _environment ) {
 
    // Equals to: "COLORMAP CLEAR WITH 0 AND 1"
    colormap_clear_with( _environment, COLOR_WHITE, COLOR_BLACK );
 
}