colormap.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 COLORMAP AT
</usermanual> */
void colormap_at( Environment * _environment, int _address ) {
 
    
 
    // Let's define the special variable and fill up with the value.
    Variable * colormapAddress = variable_retrieve_or_define( _environment, "COLORMAPADDRESS", VT_ADDRESS, _address );
 
    // TODO: colormapAddress must be retrieved by a cpc_get_colormapAddress()
 
    variable_store( _environment, colormapAddress->name, 0x5800 );
 
}

void colormap_at_var( Environment * _environment, char * _address ) {
 
    
 
    // Let's define the special variable and fill up with the value.
    // TODO: colormapAddress must be retrieved by a cpc_get_colormapAddress()
    Variable * colormapAddress = variable_retrieve_or_define( _environment, "COLORMAPADDRESS", VT_ADDRESS, 0x5800 );
    Variable * address = variable_retrieve_or_define( _environment, _address, VT_ADDRESS, 0x0000 );
 
    // variable_store( _environment, colormapAddress->name, ( ( ( _address >> 10 ) & 0x0f ) * 0x0400 ) );
 
}

void colormap_clear_with( Environment * _environment, int _foreground, int _background ) {
 
    Variable * colormapAddress = variable_retrieve( _environment, "COLORMAPADDRESS" );
 
    Variable * value = variable_temporary( _environment, VT_BYTE, "(background + foreground)" );
    Variable * blocks = variable_temporary( _environment, VT_BYTE, "(blocks)" );
 
    variable_store( _environment, blocks->name, 3 );
 
    variable_store( _environment, value->name, ( ( _background & 0x07 ) << 3 ) | ( _foreground & 0x07 ) );
 
   cpu_fill_blocks( _environment, colormapAddress->realName, blocks->realName, value->realName );
 
}

void colormap_clear_with_vars( Environment * _environment, char * _foreground, char * _background ) {
 
    Variable * colormapAddress = variable_retrieve_or_define( _environment, "COLORMAPADDRESS", VT_ADDRESS, 0x0400 );
 
    Variable * foreground = variable_retrieve_or_define( _environment, _foreground, VT_COLOR, COLOR_WHITE );
 
    Variable * background = variable_retrieve_or_define( _environment, _background, VT_COLOR, COLOR_BLACK );
 
    Variable * pattern = variable_temporary( _environment, VT_BYTE, "(pattern)" );
    Variable * blocks = variable_temporary( _environment, VT_BYTE, "(blocks)" );
 
    variable_store( _environment, blocks->name, 3 );
 
    outline1("LD A, (%s)", background->realName );
    outline0("RL A" );
    outline0("RL A" );
    outline0("RL A" );
    outline0("LD B, A" );
    outline1("LD A, (%s)", foreground->realName );
    outline0("AND $07" );
    outline0("OR B" );
    outline1("LD (%s), A", pattern->realName );
 
   cpu_fill_blocks( _environment, colormapAddress->realName, blocks->realName, pattern->realName );
 
}

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