blit_define.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 
 ****************************************************************************/
 
extern char DATATYPE_AS_STRING[][16];
 
static void blit_define_bltu( Environment * _environment, int _op, char * _a, char * _c ) {
 
    if ( _op == ( 1 << _environment->currentModeBW ) + 3 ) {
 
        MAKE_LABEL
        outline0("; bltu C = (2^bpp-1) if A > 0 (threshold)");
        switch( _environment->currentModeBW ) {
            case 1:
                outline1("LDA %s", _a );
                outline1("STA %s", _c );
                break;
            case 2:
                outline0("LDA #$0" );
                outline1("STA %s", _c );
                outline1("LDA %s", _a );
                outline0("AND #$03" );
                outline1("BEQ %sthreshold1", label );
                outline0("LDA #$03" );
                outline1("STA %s", _c );
                outhead1("%sthreshold1:", label );
                outline1("LDA %s", _a );
                outline0("AND #$0C" );
                outline1("BEQ %sthreshold2", label );
                outline0("LDA #$0C" );
                outline1("ORA %s", _c );
                outline1("STA %s", _c );
                outhead1("%sthreshold2:", label );
                outline1("LDA %s", _a );
                outline0("AND #$30" );
                outline1("BEQ %sthreshold3", label );
                outline1("LDA %s", _c );
                outline0("ORA #$30" );
                outline1("STA %s", _c );
                outhead1("%sthreshold3:", label );
                outline1("LDA %s", _a );
                outline0("AND #$C0" );
                outline1("BEQ %sthreshold4", label );
                outline1("LDA %s", _c );
                outline0("ORA #$c0" );
                outline1("STA %s", _c );
                outhead1("%sthreshold4:", label );
                break;
        }
    } else if ( _op == ( 1 << _environment->currentModeBW ) + 2 ) {
        outline0("; bltu C = 0 (ignore)");
        outline0("LDA #$0" );
        outline1("STA %s", _c );
    } else if ( _op == ( 1 << _environment->currentModeBW ) + 1 ) {
        outline0("; bltu C = !A (not)");
        outline1("LDA %s", _a );
        outline0("EOR #$ff");
        outline1("STA %s", _c );
    } else if ( _op == ( 1 << _environment->currentModeBW ) ) {
        outline0("; bltu C = A (copy)");
        outline1("LDA %s", _a );
        outline1("STA %s", _c );
    } else if ( _op < ( 1 << _environment->currentModeBW ) ) {
        unsigned char value = 0;
        switch( _environment->currentModeBW ) {
            case 1:
                if ( _op ) {
                    value = 0xff;
                } else {
                    value = 0x00;
                }
                break;
            case 2:
                value = ( ( _op & 0x1 ) );
                value |= ( ( ( _op & 0x2 ) ) << 1 );
                value = value | ( value << 2 ) | ( value << 4 ) | ( value << 6 );
                break;
        }        
        outline0("; bltu C = value");
        outline1("LDA #$%2.2x", value );
        outline1("STA %s", _c );
    }
 
}
 
static void blit_define_bltb( Environment * _environment, int _op, char * _a, char * _b, char * _d ) {
 
    if ( _op == 0 ) {
        outline0("; bltb C = A and B");
        outline1("LDA %s", _a );
        outline1("AND %s", _b );
        outline1("STA %s", _d );
    } else if ( _op == 1 ) {
        outline0("; bltb C = A or B");
        outline1("LDA %s", _a );
        outline1("ORA %s", _b );
        outline1("STA %s", _d );
    } else if ( _op == 2 ) {
        outline0("; bltb C = A xor B");
        outline1("LDA %s", _a );
        outline1("EOR %s", _b );
        outline1("STA %s", _d );
    } else if ( _op == 3 ) {
        outline0("; bltb C = A");
        outline1("LDA %s", _a );
        outline1("STA %s", _d );
    } else if ( _op == 4 ) {
        outline0("; bltb C = B");
        outline1("LDA %s", _b );
        outline1("STA %s", _d );
    } else if ( _op == 5 ) {
        outline0("; bltb C = A if B>0, 0 if B=0");
        MAKE_LABEL
        switch( _environment->currentModeBW ) {
            case 1:
                outline1("LDA %s", _a );
                outline1("AND %s", _b );
                outline1("STA %s", _d );
                break;
            case 2:
                outline1("LDA %s", _a );
                outline1("STA %s", _d );
                outline1("LDA %s", _b );
                outline0("AND #$03" );
                outline1("BNE %smask1", label );
                outline1("LDA %s", _d );
                outline0("AND #$fc" );
                outline1("STA %s", _d );
                outhead1("%smask1:", label );
                outline1("LDA %s", _b );
                outline0("AND #$0c" );
                outline1("BNE %smask2", label );
                outline1("LDA %s", _d );
                outline0("AND #$f3" );
                outline1("STA %s", _d );
                outhead1("%smask2:", label );
                outline1("LDA %s", _b );
                outline0("AND #$30" );
                outline1("BNE %smask3", label );
                outline1("LDA %s", _d );
                outline0("AND #$cf" );
                outline1("STA %s", _d );
                outhead1("%smask3:", label );
                outline1("LDA %s", _b );
                outline0("AND #$c0" );
                outline1("BNE %smask4", label );
                outline1("LDA %s", _d );
                outline0("AND #$3f" );
                outline1("STA %s", _d );
                outhead1("%smask4:", label );
                break;
        }
    }
 
}

 
void blit_define( Environment * _environment, char * _name, int _sop, int _mop, int _smop, int _iop, int _dop, int _idop, int _top ) {
 
    char blitLabel[MAX_TEMPORARY_STORAGE]; sprintf( blitLabel, "_%sblit", _name );
    char skipLabel[MAX_TEMPORARY_STORAGE]; sprintf( skipLabel, "_%sskip", _name );
 
    cpu_jump( _environment, skipLabel );
    cpu_label( _environment, blitLabel );
 
    // B = s(x,y)
    // IYL = d(x, y)
    // IYH = m(x, y)
 
    // BLITSU
    blit_define_bltu( _environment, _sop, "BLITS1", "BLITR0" );
 
    // BLITMU
    blit_define_bltu( _environment, _mop, "BLITS2", "BLITR1" );
 
    // BLITSM
    blit_define_bltb( _environment, _smop, "BLITR0", "BLITR1", "BLITR2" );
 
    // BLITSMU
    blit_define_bltu( _environment, _iop, "BLITR2", "BLITR0" );
 
    // BLITDU
    blit_define_bltu( _environment, _dop, "BLITS3", "BLITR1" );
 
    // BLITT
    blit_define_bltb( _environment, _idop, "BLITR0", "BLITR1", "BLITR2" );
 
    // BLITTU
    blit_define_bltu( _environment, _top, "BLITR2", "BLITR3" );
 
    outline0("LDA BLITR3");
 
    cpu_return( _environment );
    cpu_label( _environment, skipLabel );
 
}
 
static const char BLIT_SOURCES_REGISTER[][10] = {
    "BLITS0",  // destination
    "BLITS1",    // source 1
    "BLITS2",  // source 2
};
 
void blit_define_begin_compound( Environment * _environment, char * _name ) {
 
    char blitLabel[MAX_TEMPORARY_STORAGE]; sprintf( blitLabel, "_%sblit", _name );
    char skipLabel[MAX_TEMPORARY_STORAGE]; sprintf( skipLabel, "_%sskip", _name );
 
    if ( variable_exists( _environment, _name ) ) {
        CRITICAL_BLIT_ALREADY_DEFINED( _name );   
    }
    Variable * var = variable_define( _environment, _name, VT_BLIT, 0 );
    
    memset( &_environment->blit, 0, sizeof( Blit ) );
 
    _environment->blit.name = strdup( _name );
    _environment->blit.realName = strdup( var->realName );
 
    cpu_jump( _environment, skipLabel );
    cpu_label( _environment, blitLabel );
 
    cpu_blit_initialize( _environment );
 
}
 
void blit_define_compound_operand_to_register( Environment * _environment, int _register, int _source ) {
 
    char * reg = cpu_blit_register_name( _environment, _register ) ;
 
    outline1( "LDA %s", &BLIT_SOURCES_REGISTER[_source][0] );
    outline1( "STA %s", reg );
 
}
 
void blit_define_compound_unary( Environment * _environment, int _operation, int _operand, int _result ) {
 
    blit_define_bltu( _environment, _operation, cpu_blit_register_name( _environment, _operand ), cpu_blit_register_name( _environment, _result ) );
 
}
 
void blit_define_compound_binary( Environment * _environment, int _operation, int _operand1, int _operand2, int _result ) {
 
    blit_define_bltb( _environment, _operation, cpu_blit_register_name( _environment, _operand1 ), cpu_blit_register_name( _environment, _operand2 ), cpu_blit_register_name( _environment, _result ) );
 
}
 
void blit_define_end_compound( Environment * _environment, int _result ) {
    
    char skipLabel[MAX_TEMPORARY_STORAGE]; sprintf( skipLabel, "_%sskip", _environment->blit.name );
    char blitStageAreaName[MAX_TEMPORARY_STORAGE]; sprintf( blitStageAreaName, "%sbs", _environment->blit.name );
 
    Variable * blitStageArea = variable_define( _environment, blitStageAreaName, VT_BUFFER, 0 );
    variable_resize_buffer( _environment, blitStageArea->name, _environment->blit.usedMemory );
 
    char * reg = cpu_blit_register_name( _environment, _result ) ;
 
    outline1( "LDA %s", reg );
 
    cpu_blit_finalize( _environment );
 
    cpu_return( _environment );
    cpu_label( _environment, skipLabel );
 
}