defdgr.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

 /* <usermanual>
@keyword DEFDGR
 
@english
 
This command allows you to customize a single character from those used in graphical
mode. The character is defined by means of an 8 pixel by 8 pixel monochrome matrix. 
The ''char'' parameter must be intended as the "screen code" of the character to replace.
The screen code is the character representation mechanism of the target chipset, and is 
different from the ASCII system. Each video chipset can have its own specific set of screen 
codes and, therefore, it is necessary to retrieve the corresponding character code to 
be redefined.
 
If the system font has fewer pixels along one or both directions, the character 
will be aligned to the top left and the extra pixels will be ignored. The 
customization of the character occurs at runtime.
 
If you want to customize the characters used in text mode, or during compilation, 
you must use the ''LOAD FONT'' command.
 
 
@italian
 
Questo comando consente di personalizzare un singolo carattere tra quelli 
utilizzati in modalità grafica. Il carattere è definito tramite una matrice 
monocromatica di 8 pixel per 8 pixel. Il parametro ''char'' deve essere 
inteso come "codice schermo" del carattere da sostituire.
Il codice schermo è il meccanismo di rappresentazione dei caratteri del 
chipset di destinazione, ed è diverso dal sistema ASCII. Ogni chipset video 
può avere il suo set specifico di codici schermo e, pertanto, è necessario 
recuperare il codice carattere corrispondente da ridefinire.
 
Se il font di sistema ha meno pixel lungo una o entrambe le direzioni, il 
carattere verrà allineato in alto a sinistra e i pixel in più verranno 
ignorati. La personalizzazione del carattere avviene in fase di esecuzione.
 
Se si desidera personalizzare i caratteri utilizzati in modalità testo o 
durante la compilazione, è necessario utilizzare il comando ''LOAD FONT''.
 
@syntax DEFDGR[$](char) = b0, b1, ... , b7
 
@example DEFDGR(0) = $ff, $ff, $ff, $ff, $00, $00, $00, $00
@example DEFDGR$(1) = $ff, $ff, $ff, $ff, $00, $00, $00, $00
 
@usedInExample font_example_02.bas
 
</usermanual> */
void defdgr_vars( Environment * _environment, char * _character, char * _b0, char * _b1, char * _b2, char * _b3, char * _b4, char * _b5, char * _b6, char * _b7 ) {
 
    Variable * address = variable_temporary( _environment, VT_ADDRESS, "(address)");
 
    Variable * offset = variable_retrieve_or_define( _environment, _character, VT_WORD, 0 );
    Variable * newOffset = variable_sl_const( _environment, offset->name, 3 );
    Variable * b0 = variable_retrieve_or_define( _environment, _b0, VT_BYTE, 0 );
    Variable * b1 = variable_retrieve_or_define( _environment, _b1, VT_BYTE, 0 );
    Variable * b2 = variable_retrieve_or_define( _environment, _b2, VT_BYTE, 0 );
    Variable * b3 = variable_retrieve_or_define( _environment, _b3, VT_BYTE, 0 );
    Variable * b4 = variable_retrieve_or_define( _environment, _b4, VT_BYTE, 0 );
    Variable * b5 = variable_retrieve_or_define( _environment, _b5, VT_BYTE, 0 );
    Variable * b6 = variable_retrieve_or_define( _environment, _b6, VT_BYTE, 0 );
    Variable * b7 = variable_retrieve_or_define( _environment, _b7, VT_BYTE, 0 );
 
    cpu_addressof_16bit( _environment, "UDCCHAR", address->realName );
    cpu_math_add_16bit( _environment, address->realName, newOffset->realName, address->realName );
    cpu_move_8bit_indirect_with_offset( _environment, b0->realName, address->realName, 0 );    
    cpu_move_8bit_indirect_with_offset( _environment, b1->realName, address->realName, 1 );    
    cpu_move_8bit_indirect_with_offset( _environment, b2->realName, address->realName, 2 );    
    cpu_move_8bit_indirect_with_offset( _environment, b3->realName, address->realName, 3 );    
    cpu_move_8bit_indirect_with_offset( _environment, b4->realName, address->realName, 4);    
    cpu_move_8bit_indirect_with_offset( _environment, b5->realName, address->realName, 5 );    
    cpu_move_8bit_indirect_with_offset( _environment, b6->realName, address->realName, 6);    
    cpu_move_8bit_indirect_with_offset( _environment, b7->realName, address->realName, 7 );    
 
}