pmode.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 PMODE
 
@target d32
</usermanual> */
void pmode( Environment * _environment, int _mode, int _start_page ) {
 
    int m = 0;
 
    switch( _mode ) {
        // 0    128x96      BITMAP_MODE_RESOLUTION2
        case 0:
            m = BITMAP_MODE_RESOLUTION2;
            break;
        // 1    128x96      BITMAP_MODE_COLOR3
        case 1:
            m = BITMAP_MODE_COLOR3;
            break;
        // 2    192x128     BITMAP_MODE_RESOLUTION3
        case 2:
            m = BITMAP_MODE_RESOLUTION3;
            break;
        // 3    192x128     BITMAP_MODE_COLOR6
        case 3:
            m = BITMAP_MODE_COLOR6;
            break;
        // 4    256x192     BITMAP_MODE_RESOLUTION6        
        case 4:
            m = BITMAP_MODE_RESOLUTION6;
            break;
        default:
            WARNING_SCREEN_MODE( _mode );
            break;
    }
 
    if ( m ) {
 
        ScreenMode * mode = find_screen_mode_by_id( _environment, m );
 
        if ( mode ) {
            
            c6847_screen_mode_enable( _environment, mode );    
 
            _environment->currentMode = mode->id;
            _environment->currentTileMode = mode->bitmap ? 0 : 1;
 
            cpu_store_8bit( _environment, "CURRENTMODE", _environment->currentMode );
            cpu_store_8bit( _environment, "CURRENTTILEMODE", _environment->currentTileMode );
 
        } else {
            WARNING_SCREEN_MODE( _mode );
        }
 
    }
 
}