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optimized cx16 txt screen functions to use VERA autoincrement

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This commit is contained in:
Irmen de Jong 2020-09-21 19:23:21 +02:00
parent ca9588380a
commit ba3dce0b4c
3 changed files with 76 additions and 62 deletions
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7
compiler/res/prog8lib/c64/textio.p8
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@ -16,11 +16,8 @@ const ubyte DEFAULT_WIDTH = 40
const ubyte DEFAULT_HEIGHT = 25
asmsub clear_screen() {
%asm {{
lda #' '
jmp clear_screenchars
}}
sub clear_screen() {
clear_screenchars(' ')
}
asmsub fill_screen (ubyte char @ A, ubyte charcolor @ Y) clobbers(A) {

118
compiler/res/prog8lib/cx16/textio.p8
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@ -16,74 +16,78 @@ const ubyte DEFAULT_HEIGHT = 60
sub clear_screen() {
c64.CHROUT(147) ; clear screen (spaces)
clear_screenchars(' ')
}
asmsub fill_screen (ubyte char @ A, ubyte txtcolor @ Y) clobbers(A) {
; ---- fill the character screen with the given fill character and character color.
; TODO this can be done more efficiently with the VERA auto increment mode?
%asm {{
sta P8ZP_SCRATCH_W1 ; fillchar
sty P8ZP_SCRATCH_W1+1 ; textcolor
sty _ly+1
phx
pha
jsr c64.SCREEN ; get dimensions in X/Y
dex
dey
txa
asl a
adc #1
sta P8ZP_SCRATCH_B1
- ldx P8ZP_SCRATCH_B1
- stz cx16.VERA_ADDR_H
stx cx16.VERA_ADDR_L
sty cx16.VERA_ADDR_M
lda cx16.VERA_DATA0
and #$f0
ora P8ZP_SCRATCH_W1+1
lsr a
lsr a
sta _lx+1
lda #%00010000
sta cx16.VERA_ADDR_H ; enable auto increment by 1, bank 0.
stz cx16.VERA_ADDR_L ; start at (0,0)
stz cx16.VERA_ADDR_M
pla
_lx ldx #0 ; modified
phy
_ly ldy #1 ; modified
- sta cx16.VERA_DATA0
sty cx16.VERA_DATA0
sta cx16.VERA_DATA0
dex
stz cx16.VERA_ADDR_H
stx cx16.VERA_ADDR_L
sty cx16.VERA_ADDR_M
lda P8ZP_SCRATCH_W1
sty cx16.VERA_DATA0
sta cx16.VERA_DATA0
sty cx16.VERA_DATA0
sta cx16.VERA_DATA0
sty cx16.VERA_DATA0
dex
cpx #255
bne -
ply
dey
bpl --
plx
beq +
stz cx16.VERA_ADDR_L
inc cx16.VERA_ADDR_M ; next line
bra _lx
+ plx
rts
}}
}}
}
asmsub clear_screenchars (ubyte char @ A) clobbers(Y) {
; ---- clear the character screen with the given fill character (leaves colors)
; (assumes screen matrix is at the default address)
; TODO this can be done more efficiently with the VERA auto increment mode?
%asm {{
phx
pha
jsr c64.SCREEN ; get dimensions in X/Y
dex
dey
txa
asl a
sta _mod+1
lsr a
lsr a
sta _lx+1
lda #%00100000
sta cx16.VERA_ADDR_H ; enable auto increment by 2, bank 0.
stz cx16.VERA_ADDR_L ; start at (0,0)
stz cx16.VERA_ADDR_M
pla
_mod ldx #0 ; modified
- stz cx16.VERA_ADDR_H
stx cx16.VERA_ADDR_L
sty cx16.VERA_ADDR_M
_lx ldx #0 ; modified
- sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
dex
dex
cpx #-2
bne -
dey
bpl _mod
plx
beq +
stz cx16.VERA_ADDR_L
inc cx16.VERA_ADDR_M ; next line
bra _lx
+ plx
rts
}}
}
@ -91,30 +95,34 @@ _mod ldx #0 ; modified
asmsub clear_screencolors (ubyte scrcolor @ A) clobbers(Y) {
; ---- clear the character screen colors with the given color (leaves characters).
; (assumes color matrix is at the default address)
; TODO this can be done more efficiently with the VERA auto increment mode?
%asm {{
phx
pha
sta _la+1
jsr c64.SCREEN ; get dimensions in X/Y
dex
dey
txa
asl a
ina
sta _mod+1
pla
_mod ldx #0 ; modified
- stz cx16.VERA_ADDR_H
stx cx16.VERA_ADDR_L
sty cx16.VERA_ADDR_M
lsr a
lsr a
sta _lx+1
lda #%00100000
sta cx16.VERA_ADDR_H ; enable auto increment by 2, bank 0.
lda #1
sta cx16.VERA_ADDR_L ; start at (1,0)
stz cx16.VERA_ADDR_M
_lx ldx #0 ; modified
_la lda #0 ; modified
- sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
sta cx16.VERA_DATA0
dex
dex
cpx #-1
bne -
dey
bpl _mod
plx
beq +
lda #1
sta cx16.VERA_ADDR_L
inc cx16.VERA_ADDR_M ; next line
bra _lx
+ plx
rts
}}
}

13
examples/test.p8
View File

@ -1,7 +1,6 @@
%import syslib
; %import graphics
%import textio
%import floats
%zeropage basicsafe
@ -9,7 +8,17 @@ main {
sub start() {
txt.clear_screenchars('*')
; 40 x 25
; 80 x 60
txt.fill_screen('*', 8)
txt.clear_screen()
txt.print_ub(txt.width())
txt.chrout('\n')
txt.print_ub(txt.height())
txt.chrout('\n')
ubyte i
repeat {
txt.clear_screencolors(i)