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added cx16 txt.scroll_down

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Irmen de Jong 2020-09-21 22:06:48 +02:00
parent 2dbf849c82
commit 8a99e75299
2 changed files with 55 additions and 19 deletions
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63
compiler/res/prog8lib/cx16/textio.p8
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@ -162,7 +162,7 @@ asmsub scroll_right (ubyte dummy @ Pc) clobbers(A) {
; Carry flag is a dummy on the cx16
}
asmsub scroll_up (ubyte dummy @ Pc) clobbers(A) {
asmsub scroll_up (ubyte dummy @ Pc) clobbers(A, Y) {
; ---- scroll the whole screen 1 character up
; contents of the bottom row are unchanged, you should refill/clear this yourself
; Carry flag is a dummy on the cx16
@ -172,6 +172,7 @@ asmsub scroll_up (ubyte dummy @ Pc) clobbers(A) {
txa
lsr a
lsr a
dea
sta P8ZP_SCRATCH_REG ; number of columns / 4 due to loop unroll
dey
sty P8ZP_SCRATCH_B1 ; number of lines to scroll up
@ -180,7 +181,20 @@ asmsub scroll_up (ubyte dummy @ Pc) clobbers(A) {
lda #1
sta cx16.VERA_ADDR_M ; start at (0, 1)
_scrolline ldy #0
- jsr _copy_line_to_buffer
; now copy the linebuffer back to the line above this one
dec cx16.VERA_ADDR_M
jsr _copy_buffer_to_line
; next line to copy
inc cx16.VERA_ADDR_M
inc cx16.VERA_ADDR_M
dec P8ZP_SCRATCH_B1
bne -
plx
rts
_copy_line_to_buffer:
ldy #0
stz cx16.VERA_ADDR_L
ldx P8ZP_SCRATCH_REG
- lda cx16.VERA_DATA0
@ -209,10 +223,11 @@ _scrolline ldy #0
iny
dex
bpl -
; now copy the linebuffer back to the line above this one
stz cx16.VERA_ADDR_L
dec cx16.VERA_ADDR_M
rts
_copy_buffer_to_line
ldy #0
stz cx16.VERA_ADDR_L
ldx P8ZP_SCRATCH_REG
- lda _scrollbuffer,y
sta cx16.VERA_DATA0
@ -240,23 +255,43 @@ _scrolline ldy #0
iny
dex
bpl -
inc cx16.VERA_ADDR_M
inc cx16.VERA_ADDR_M ; next line to copy
dec P8ZP_SCRATCH_B1
bne _scrolline
plx
rts
rts
_scrollbuffer .fill 160, 0
}}
}
asmsub scroll_down (ubyte dummy @ Pc) clobbers(A) {
asmsub scroll_down (ubyte dummy @ Pc) clobbers(A, Y) {
; ---- scroll the whole screen 1 character down
; contents of the top row are unchanged, you should refill/clear this yourself
; Carry flag is a dummy on the cx16
%asm {{
phx
jsr c64.SCREEN
txa
lsr a
lsr a
dea
sta P8ZP_SCRATCH_REG ; number of columns / 4 due to loop unroll
dey
sty P8ZP_SCRATCH_B1 ; number of lines to scroll up
dey
sty cx16.VERA_ADDR_M ; start at line before bottom line
lda #%00010000
sta cx16.VERA_ADDR_H ; enable auto increment by 1, bank 0.
- jsr scroll_up._copy_line_to_buffer
; now copy the linebuffer back to the line below this one
inc cx16.VERA_ADDR_M
jsr scroll_up._copy_buffer_to_line
; next line to copy
dec cx16.VERA_ADDR_M
dec cx16.VERA_ADDR_M
dec P8ZP_SCRATCH_B1
bne -
plx
rts
}}
}
romsub $FFD2 = chrout(ubyte char @ A) ; for consistency. You can also use c64.CHROUT directly ofcourse.

11
examples/test.p8
View File

@ -10,13 +10,14 @@ main {
ubyte x
ubyte y
for y in 0 to txt.DEFAULT_HEIGHT-1 {
for x in 0 to txt.DEFAULT_WIDTH-1 {
txt.setchr(x,y,x+y)
}
}
; for y in 0 to txt.DEFAULT_HEIGHT-1 {
; for x in 0 to txt.DEFAULT_WIDTH-1 {
; txt.setchr(x,y,x+y)
; }
; }
repeat 60 {
txt.setcc(rnd() % 80, 59, 81, 5)
txt.scroll_up(true)
repeat 5000 {