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keen: more work on mars map

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This commit is contained in:
Vince Weaver 2024-03-12 00:58:15 -04:00
parent e002d2e982
commit d34a2131a9
1 changed files with 115 additions and 9 deletions
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124
games/keen/keen_mars.s
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@ -193,12 +193,12 @@ draw_keen:
lda KEEN_Y lda KEEN_Y
and #1 and #1
bne draw_keen_odd beq draw_keen_even
draw_keen_odd: draw_keen_odd:
; calculate address of KEEN_Y/2
draw_keen_even:
lda KEEN_Y lda KEEN_Y
and #$FE and #$FE
tay tay
@ -210,9 +210,68 @@ draw_keen_even:
sta OUTH sta OUTH
ldy KEEN_X ldy KEEN_X
lda (OUTL),Y
and #$0f
ora #$D0
sta (OUTL),Y
lda KEEN_Y
clc
adc #2
and #$FE
tay
lda gr_offsets,Y
sta OUTL
lda gr_offsets+1,Y
clc
adc DRAW_PAGE
sta OUTH
ldy KEEN_X
lda #$23
sta (OUTL),Y
rts
draw_keen_even:
lda KEEN_Y
; and #$FE ; no need to mask, know bottom bit is 0
tay
lda gr_offsets,Y
sta OUTL
lda gr_offsets+1,Y
clc
adc DRAW_PAGE
sta OUTH
ldy KEEN_X ; adjust with Xpos
lda #$3D lda #$3D
sta (OUTL),Y sta (OUTL),Y
lda KEEN_Y
clc
adc #2
; and #$FE ; no need to mask
tay
lda gr_offsets,Y
sta OUTL
lda gr_offsets+1,Y
clc
adc DRAW_PAGE
sta OUTH
ldy KEEN_X ; adjust with Xpos
lda (OUTL),Y
and #$F0
ora #$02
sta (OUTL),Y
rts rts
@ -328,12 +387,11 @@ check_left:
bne check_right bne check_right
left_pressed: left_pressed:
; lda KEEN_DIRECTION ldy KEEN_X
; cmp #$ff ; check if facing left dey
; bne face_left ldx KEEN_Y
jsr check_valid_feet
; lda #1 bcc done_left_pressed
; sta KEEN_WALKING
dec KEEN_X dec KEEN_X
done_left_pressed: done_left_pressed:
jmp done_keypress jmp done_keypress
@ -345,6 +403,11 @@ check_right:
bne check_up bne check_up
right_pressed: right_pressed:
ldy KEEN_X
iny
ldx KEEN_Y
jsr check_valid_feet
bcc done_right_pressed
inc KEEN_X inc KEEN_X
done_right_pressed: done_right_pressed:
jmp done_keypress jmp done_keypress
@ -356,6 +419,11 @@ check_up:
bne check_down bne check_down
up_pressed: up_pressed:
ldy KEEN_X
ldx KEEN_Y
dex
jsr check_valid_feet
bcc done_up_pressed
dec KEEN_Y dec KEEN_Y
done_up_pressed: done_up_pressed:
jmp done_keypress jmp done_keypress
@ -366,7 +434,11 @@ check_down:
cmp #$0A cmp #$0A
bne check_space bne check_space
down_pressed: down_pressed:
ldy KEEN_X
ldx KEEN_Y
inx
jsr check_valid_feet
bcc done_up_pressed
inc KEEN_Y inc KEEN_Y
done_down_pressed: done_down_pressed:
jmp done_keypress jmp done_keypress
@ -408,3 +480,37 @@ done_keypress:
no_keypress: no_keypress:
bit KEYRESET bit KEYRESET
rts rts
; essentially if SCRN(Y,X+2)=9
check_valid_feet:
txa
clc
adc #2
and #$FE
tax
lda gr_offsets,X
sta OUTL
lda gr_offsets+1,X
clc
adc #$8 ; into $C00 page (bg lives here)
sta OUTH
lda (OUTL),Y
and #$F0
cmp #$90
beq feet_valid
bne feet_invalid
feet_valid:
sec
rts
feet_invalid:
clc
rts