keen: more work on story

This commit is contained in:
Vince Weaver 2024-05-09 09:09:42 -04:00
parent ce36d74251
commit 3c19cd57f5
1 changed files with 157 additions and 55 deletions

View File

@ -57,89 +57,172 @@ load_background:
bit SET_TEXT
bit PAGE1
lda #<story_data
sta START_LINE_L
lda #>story_data
sta START_LINE_H
;===========================
; main loop
;===========================
; 16 + 16 * (16 + 40*(39) +7) + 17 + 17*40
; 16 + 16*(1583) + 17 + 680
; 16 + 25328 + 17 + 680
; 26041 = 400 lines :( we're on 16*8=128
redraw_text:
ldx #0
ldx #0 ; 2
lda START_LINE_L
sta INL
lda START_LINE_H
sta INH
lda START_LINE_L ; 3
sta input_smc+1 ; 4
lda START_LINE_H ; 3
sta input_smc+2 ; 4
;===========
; 16
outer_text_loop:
lda gr_offsets_low,X
sta OUTL
lda gr_offsets_high,X
sta OUTH
lda gr_offsets_low,X ; 4+
sta OUTL ; 3
lda gr_offsets_high,X ; 4+
sta OUTH ; 3
ldy #0 ; 2
;============
; 16
ldy #39
inner_text_loop:
lda (INL),Y
sta (OUTL),Y
dey
bpl inner_text_loop
clc
lda INL
adc #40
sta INL
lda INH
adc #0
sta INH
input_smc:
lda story_bg ; 4
sta (OUTL),Y ; 6
inx
cpx #17
bne outer_text_loop
clc ; 2
lda input_smc+1 ; 4
adc #1 ; 2
sta input_smc+1 ; 4
lda input_smc+2 ; 4
adc #0 ; 2
sta input_smc+2 ; 4
iny ; 2
cpy #40 ; 2
bne inner_text_loop ; 2/3
;============
; 39
; -1
inx ; 2
cpx #16 ; 2
bne outer_text_loop ; 2/3
;============
; 7
; -1
;==================
; draw message
;==================
ldx #18
lda gr_offsets_low,X
sta OUTL
lda gr_offsets_high,X
sta OUTH
ldx #17 ; 2
lda gr_offsets_low,X ; 4+
sta OUTL ; 3
lda gr_offsets_high,X ; 4+
sta OUTH ; 3
ldy #39 ; 2
;==================
; 17
ldy #39
message_text_loop:
lda message,Y
and #$3f
sta (OUTL),Y
dey
bpl message_text_loop
lda message,Y ; 4+
and #$3f ; 2
sta (OUTL),Y ; 6
dey ; 2
bpl message_text_loop ; 2/3
;==================
; 17*40
jsr wait_until_keypress
; -1
and #$7f ; clear high bit
and #$df ; change lower to upper
;===================================
; can we do this constant time?
;===================================
cmp #13
beq done_with_story
cmp #27
beq done_with_story
check_keypress:
lda KEYPRESS ; 4
bpl done_key7 ; 2/3
; 6
bit KEYRESET ; 4
cmp #'W'
beq do_up
cmp #$0B
beq do_up
and #$7f ; clear high bit ; 2
and #$df ; change lower to upper ; 2
; 14
cmp #13 ; 2
beq done_with_story ; 2/3
; 18
cmp #27 ; 2
beq done_with_story ; 2/3
; 22
cmp #'W' ; 2
beq do_up ; 2/3
; 26
cmp #$0B ; 2
beq do_up ; 2/3
; 30
cmp #'S' ; 2
beq do_down ; 2/3
; 34
cmp #$0A ; 2
beq do_down ; 2/3
; 38
bne done_key41 ; bra ; 3
cmp #'S'
beq do_down
cmp #$0A
beq do_down
done_key7:
; need to waste 34 cycles
inc $00 ; 5
inc $00 ; 5
inc $00 ; 5
inc $00 ; 5
inc $00 ; 5
inc $00 ; 5
nop
nop
done_key41:
inc $00
nop
; 18*8*65= 9360
; want to delay 9360 - 41 - 7 - 4 = 9308 - 20 = 9288/9 = 1032
; 1032/256= 4 r 8
;
lda #4 ; 2
ldy #8 ; 2
jsr delay_loop
; want to delay 6*8*65 = 3120+4550 = 7670
; want to delay 7670 - 15 - 12 = 7643 - 20 = 7623/9 = 847
; 905/256=3 r 79
inc $00 ; nop5
inc $00 ; nop5
nop ; nop2
bit SET_GR ; 4
lda #3 ; 2
ldy #79 ; 2
jsr delay_loop
bit SET_TEXT ; 4
done_key:
jmp redraw_text
jmp check_keypress ; 3
do_up:
lda START_LINE_H
@ -171,7 +254,6 @@ do_down:
beq done_key
down_ok:
clc
lda START_LINE_L
adc #40
@ -181,7 +263,6 @@ down_ok:
sta START_LINE_H
jmp redraw_text
done_with_story:
@ -199,7 +280,7 @@ done_with_story:
.include "gr_copy.s"
; .include "wait_a_bit.s"
.include "gr_offsets.s"
.include "gr_offsets_split.s"
.include "zx02_optim.s"
.include "gr_fast_clear.s"
@ -222,6 +303,27 @@ wait_until_keypress:
bit KEYRESET
rts
.align $100
message:
.byte " ESC TO EXIT / ARROWS TO READ ",0
.include "gr_offsets_split.s"
;=====================================
; short delay by Bruce Clark
; any delay between 8 to 589832 with res of 9
;=====================================
; 9*(256*A+Y)+8 + 12 for jsr/rts
; A and Y both $FF at the end
size_delay:
delay_loop:
cpy #1
dey
sbc #0
bcs delay_loop
delay_12:
rts