double_buffer.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 DOUBLE BUFFER
@target pc128op
</usermanual> */
void double_buffer( Environment * _environment, int _enabled ) {
 
    if ( !_environment->vestigialConfig.doubleBufferSelected || _environment->vestigialConfig.doubleBuffer ) {
 
        if ( banks_any_used( _environment ) && _environment->currentMode == BITMAP_MODE_BITMAP_16 ) {
            CRITICAL_CANNOT_DOUBLE_BUFFER_AFTER_LOADING_RESOURCES( );
        }
 
        deploy_preferred( clsGraphic, src_hw_ef936x_cls_asm );
        deploy( doubleBuffer, src_hw_ef936x_double_buffer_asm );
 
        if ( _environment->doubleBufferEnabled != _enabled ) {
 
            _environment->doubleBufferEnabled = _enabled;
 
            if ( _enabled ) {
 
                int allowed[] = { 6, 5, 4 };
 
                banks_init_extended( _environment, allowed, sizeof( allowed ) / sizeof( int ), BANK_SIZE );
 
                if ( _environment->deployed.scroll ) {
                    cpu_set_callback( _environment, "SCREENSCROLLEMBED", "SCREENSCROLLVOID" );
                    cpu_set_callback( _environment, "ONSWITCHTILEMAP", "SCREENSCROLL" );
                }
                outline0("JSR DOUBLEBUFFERINIT")
            } else {
                if ( _environment->deployed.scroll ) {
                    cpu_set_callback( _environment, "SCREENSCROLLEMBED", "SCREENSCROLL" );
                    cpu_set_callback( _environment, "ONSWITCHTILEMAP", "SCREENSCROLLVOID" );
                }
                outline0("JSR DOUBLEBUFFERCLEANUP")
            }
 
        };
 
    }
 
}