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specify VERA data port to use
This commit is contained in:
Irmen de Jong
parent
cf49cbd1f8
commit
d3f433c8cf
@ -30,6 +30,7 @@ asmsub fill_screen (ubyte char @ A, ubyte color @ Y) clobbers(A) {
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lsr a
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lsr a
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sta _lx+1
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stz cx16.VERA_CTRL
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lda #%00010000
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sta cx16.VERA_ADDR_H ; enable auto increment by 1, bank 0.
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stz cx16.VERA_ADDR_L ; start at (0,0)
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@ -70,6 +71,7 @@ asmsub clear_screenchars (ubyte char @ A) clobbers(Y) {
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lsr a
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lsr a
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sta _lx+1
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stz cx16.VERA_CTRL
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lda #%00100000
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sta cx16.VERA_ADDR_H ; enable auto increment by 2, bank 0.
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stz cx16.VERA_ADDR_L ; start at (0,0)
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@ -103,6 +105,7 @@ asmsub clear_screencolors (ubyte color @ A) clobbers(Y) {
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lsr a
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lsr a
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sta _lx+1
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stz cx16.VERA_CTRL
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lda #%00100000
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sta cx16.VERA_ADDR_H ; enable auto increment by 2, bank 0.
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lda #1
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@ -157,7 +160,35 @@ asmsub scroll_left (ubyte dummy @ Pc) clobbers(A, Y) {
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%asm {{
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phx
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jsr c64.SCREEN
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dex
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stx _nextrow+1 ; number of columns to scroll
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dey
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sty P8ZP_SCRATCH_B1 ; number of rows to scroll
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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_nextrow
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ldx #0 ; modified
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stz cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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- lda cx16.VERA_DATA0 ; char
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inc cx16.VERA_ADDR_L
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ldy cx16.VERA_DATA0 ; color
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dec cx16.VERA_ADDR_L
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dec cx16.VERA_ADDR_L
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dec cx16.VERA_ADDR_L
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sta cx16.VERA_DATA0
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inc cx16.VERA_ADDR_L
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sty cx16.VERA_DATA0
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inc cx16.VERA_ADDR_L
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inc cx16.VERA_ADDR_L
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inc cx16.VERA_ADDR_L
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dex
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bpl -
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dec P8ZP_SCRATCH_B1
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ldy P8ZP_SCRATCH_B1
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bpl _nextrow
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plx
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rts
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}}
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@ -173,7 +204,7 @@ asmsub scroll_up (ubyte dummy @ Pc) clobbers(A, Y) {
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; ---- scroll the whole screen 1 character up
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; contents of the bottom row are unchanged, you should refill/clear this yourself
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; Carry flag is a dummy on the cx16
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; TODO maybe a version without using intermediate buffer is faster? (avoid double store/read)
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; TODO use the VERA dual data port
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%asm {{
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phx
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jsr c64.SCREEN
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@ -184,6 +215,7 @@ asmsub scroll_up (ubyte dummy @ Pc) clobbers(A, Y) {
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sta P8ZP_SCRATCH_REG ; number of columns / 4 due to loop unroll
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dey
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sty P8ZP_SCRATCH_B1 ; number of lines to scroll up
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stz cx16.VERA_CTRL
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lda #%00010000
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sta cx16.VERA_ADDR_H ; enable auto increment by 1, bank 0.
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lda #1
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@ -273,7 +305,7 @@ asmsub scroll_down (ubyte dummy @ Pc) clobbers(A, Y) {
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; ---- scroll the whole screen 1 character down
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; contents of the top row are unchanged, you should refill/clear this yourself
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; Carry flag is a dummy on the cx16
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; TODO maybe a version without using intermediate buffer is faster? (avoid double store/read)
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; TODO use the VERA dual data port
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%asm {{
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phx
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jsr c64.SCREEN
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@ -285,6 +317,7 @@ asmsub scroll_down (ubyte dummy @ Pc) clobbers(A, Y) {
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dey
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sty P8ZP_SCRATCH_B1 ; number of lines to scroll up
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dey
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stz cx16.VERA_CTRL
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sty cx16.VERA_ADDR_M ; start at line before bottom line
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lda #%00010000
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sta cx16.VERA_ADDR_H ; enable auto increment by 1, bank 0.
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@ -534,6 +567,7 @@ asmsub setchr (ubyte col @X, ubyte row @Y, ubyte character @A) clobbers(A) {
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pha
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txa
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asl a
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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sta cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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@ -547,6 +581,7 @@ asmsub getchr (ubyte col @A, ubyte row @Y) -> ubyte @ A {
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; ---- get the character in the screen matrix at the given location
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%asm {{
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asl a
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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sta cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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@ -562,6 +597,7 @@ asmsub setclr (ubyte col @X, ubyte row @Y, ubyte color @A) clobbers(A) {
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txa
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asl a
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ina
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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sta cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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@ -576,6 +612,7 @@ asmsub getclr (ubyte col @A, ubyte row @Y) -> ubyte @ A {
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%asm {{
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asl a
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ina
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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sta cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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@ -595,6 +632,7 @@ sub setcc (ubyte column, ubyte row, ubyte char, ubyte charcolor) {
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lda charcolor
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and #$0f
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sta P8ZP_SCRATCH_B1
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stz cx16.VERA_CTRL
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stz cx16.VERA_ADDR_H
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stx cx16.VERA_ADDR_L
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sty cx16.VERA_ADDR_M
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@ -10,17 +10,17 @@ main {
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ubyte x
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ubyte y
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; for y in 0 to txt.DEFAULT_HEIGHT-1 {
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; for x in 0 to txt.DEFAULT_WIDTH-1 {
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; txt.setchr(x,y,x+y)
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; }
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; }
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for y in 0 to txt.DEFAULT_HEIGHT-1 {
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for x in 0 to txt.DEFAULT_WIDTH-1 {
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txt.setchr(x,y,x+y)
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}
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}
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repeat txt.DEFAULT_WIDTH {
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txt.setcc(txt.DEFAULT_WIDTH-1, rnd() % txt.DEFAULT_HEIGHT, 81, 2)
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txt.scroll_left(true)
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repeat 5000 {
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repeat 2000 {
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x++
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}
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}
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