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fish: speed up background copy

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This commit is contained in:
Vince Weaver 2024-06-12 20:28:00 -04:00
parent 1c290ed271
commit 01bf61e944
1 changed files with 44 additions and 14 deletions
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58
games/sb/fish/fish.s
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@ -20,7 +20,9 @@
; NOTES
; hgr page1= $2000-$3fff
; hgr page2= $4000-$5fff
; code = $4000-$bfff
; code = $4000-$9fff (24k) code
; saved bg = $a000-$bfff
; note we have to be done with the code in page2 before
; we over-write it by playing the game
@ -190,16 +192,16 @@ load_background:
lda #>bg_data
sta ZX0_src+1
lda #$20
lda #$a0 ; background copy at $a000
jsr full_decomp
lda #<bg_data
sta ZX0_src
lda #>bg_data
sta ZX0_src+1
; lda #<bg_data
; sta ZX0_src
; lda #>bg_data
; sta ZX0_src+1
lda #$40
; lda #$40
;===================
; set up variables
@ -247,20 +249,48 @@ main_loop:
;========================
;========================
;==================================
; copy over (erase) old background
lda #<bg_data
sta ZX0_src
lda #>bg_data
sta ZX0_src+1
; this isn't fast, but much faster than decompressing
; we could be faster if we unrolled, or only
; did part of the screen
lda #$a0
sta INH
clc
lda DRAW_PAGE
adc #$20
sta OUTH
jsr full_decomp
lda #$0
sta INL
sta OUTL
ldy #0
bg_copy_loop:
lda (INL),Y
sta (OUTL),Y
dey
bne bg_copy_loop
inc INH
inc OUTH
lda INH
cmp #$C0
bne bg_copy_loop
; lda #<bg_data
; sta ZX0_src
; lda #>bg_data
; sta ZX0_src+1
; clc
; lda DRAW_PAGE
; adc #$20
; jsr full_decomp
inc FRAME
@ -268,7 +298,7 @@ main_loop:
; draw boat
lda FRAME
; lsr
lsr
; lsr
and #$3
tax