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soft80_cpeekc.s
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soft80_cpeekc.s
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//
// 2017-12-28, Groepaz
//
// char cpeekc (void)//
//
#import "soft80.inc"
soft80_cpeekc:
jsr soft80_cpeekchar
// 0-1F -> A0-BF
// 20-7F -> 20-7F
cmp #$20
bcs !sk+
//clc
adc #$a0
!sk:
ldx #0
rts
soft80_cpeekchar:
sei
lda #$34
sta $01
lda CURS_X
and #$01
beq !+
jmp !l1a+ // jne
!:
// test non-inverted character (left side)
ldx #0
l2aa:
ldy #0
/* .repeat 8,line
lda (SCREEN_PTR),y
and #$f0
cmp soft80_hi_charset+(line*$80),x
bne l2b
.if (line < 7)
iny
.endif
.endrepeat
*/
.for (var line = 0; line < 8; line++) {
lda (SCREEN_PTR),y
and #$f0
cmp soft80_hi_charset+(line*$80),x
bne l2b
.if (line < 7) {
iny
}
}
backok:
lda #$36
sta $01
cli
txa // return char in A
ldx #$00 // revers flag
rts
l2b:
inx
cpx #$80
bne l2aa // jne
// test inverted character (left side)
ldx #0
l2aa2:
ldy #0
/* .repeat 8,line
lda (SCREEN_PTR),y
and #$f0
eor #$f0
cmp soft80_hi_charset+(line*$80),x
bne l2b2
.if (line < 7)
iny
.endif
.endrepeat
*/
.for (var line = 0; line < 8; line++) {
and #$f0
eor #$f0
cmp soft80_hi_charset+(line*$80),x
bne l2b2
.if (line < 7) {
iny
}
}
backokrevers:
lda #$36
sta $01
cli
txa // return char in A
ldx #$01 // revers flag
rts
l2b2:
inx
cpx #$80
bne l2aa2 // XXX jne
backerr:
lda #$36
sta $01
cli
ldx #0
txa
rts
// test non-inverted character (right side)
!l1a:
ldx #0
l1aa:
ldy #0
/* .repeat 8,line
lda (SCREEN_PTR),y
and #$0f
eor soft80_lo_charset+(line*$80),x
bne l2bb
.if line < 7
iny
.endif
.endrepeat
*/
.for (var line = 0; line < 8; line++) {
lda (SCREEN_PTR),y
and #$0f
eor soft80_lo_charset+(line*$80),x
bne l2bb
.if (line < 7) {
iny
}
}
jmp backok
l2bb:
inx
cpx #$80
bne l1aa
// test inverted character (right side)
ldx #0
l1aa2:
ldy #0
/* .repeat 8,line
lda (SCREEN_PTR),y
and #$0f
eor #$0f
eor soft80_lo_charset+(line*$80),x
bne l2bb2
.if line < 7
iny
.endif
.endrepeat
*/
.for (var line = 0; line < 8; line++) {
lda (SCREEN_PTR),y
and #$0f
eor #$0f
eor soft80_lo_charset+(line*$80),x
bne l2bb2
.if (line < 7) {
iny
}
}
jmp backokrevers
l2bb2:
inx
cpx #$80
bne l1aa2
jmp backerr