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kfest: we have rasterbar

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This commit is contained in:
Vince Weaver 2018-07-20 14:45:04 -04:00
parent d5d3319631
commit 0f13336ea8
1 changed files with 35 additions and 22 deletions
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57
kfest2018/raster2.s
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@ -1,7 +1,8 @@
; Kansasfest HackFest Entry
; Zero Page
FRAMEBUFFER = $00 ; $00 - $10
FRAMEBUFFER = $00 ; $00 - $0F
YPOS = $10
DRAW_PAGE = $EE
CURRENT_OFFSET = $EF
OFFSET_GOVERNOR = $F0
@ -32,6 +33,7 @@ WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
sta DRAW_PAGE
sta CURRENT_OFFSET
sta OFFSET_GOVERNOR
sta YPOS
; Clear Page0
lda #$00
@ -248,21 +250,21 @@ page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; delay 1738 (4550 +1 from falltrough, -2 for loadup, -2661 scroll -3)
; - 147
; delay 1711 (4550 +1 from falltrough, -2 for loadup, -2661 scroll -3)
; - 147 - 27
; Try X=9 Y=34 cycles=1735 R3
; Try X=33 Y=10 cycles=1711
; waste 2 cycles
lda DRAW_PAGE ; 3
; lda DRAW_PAGE ; 3
;lda DRAW_PAGE ; 3
; nop ; 2
ldy #34 ; 2
ldy #10 ; 2
loop5:
ldx #9 ; 2
ldx #33 ; 2
loop6:
dex ; 2
bne loop6 ; 2nt/3
@ -287,6 +289,17 @@ clear_fb_loop:
;==================
; Set Rasterbar
;==================
; 27 cycles
ldx YPOS ; 3
lda #$b1 ; 2
sta FRAMEBUFFER,X ; 4
lda #$f3 ; 2
sta FRAMEBUFFER+1,X ; 4
lda #$1b ; 2
sta FRAMEBUFFER+2,X ; 4
lda #$03 ; 2
sta FRAMEBUFFER+3,X ; 4
;==================
@ -301,34 +314,34 @@ clear_fb_loop:
raster_loop2:
lda FRAMEBUFFER ; 3
sta $600,X ; 5
lda FRAMEBUFFER+1 ; 3
sta $680,X ; 5
lda FRAMEBUFFER+2 ; 3
sta $700,X ; 5
lda FRAMEBUFFER+3 ; 3
sta $780,X ; 5
sta $680,X ; 5
lda FRAMEBUFFER+4 ; 3
sta $428,X ; 5
sta $700,X ; 5
lda FRAMEBUFFER+5 ; 3
sta $780,X ; 5
lda FRAMEBUFFER+8 ; 3
sta $428,X ; 5
lda FRAMEBUFFER+10 ; 3
sta $4a8,X ; 5
lda FRAMEBUFFER+6 ; 3
lda FRAMEBUFFER+12 ; 3
sta $528,X ; 5
lda FRAMEBUFFER+7 ; 3
lda FRAMEBUFFER+14 ; 3
sta $5a8,X ; 5
lda FRAMEBUFFER+8
lda FRAMEBUFFER+1
sta $A00,X
lda FRAMEBUFFER+9
lda FRAMEBUFFER+3
sta $A80,X
lda FRAMEBUFFER+10
lda FRAMEBUFFER+5
sta $B00,X
lda FRAMEBUFFER+11
lda FRAMEBUFFER+7
sta $B80,X
lda FRAMEBUFFER+12
lda FRAMEBUFFER+9
sta $828,X
lda FRAMEBUFFER+13
lda FRAMEBUFFER+11
sta $8a8,X
lda FRAMEBUFFER+14
lda FRAMEBUFFER+13
sta $928,X
lda FRAMEBUFFER+15
sta $9a8,X