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sa: start a HGR infrastructure

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HGR is a pain
This commit is contained in:
Vince Weaver 2018-05-24 19:42:22 -04:00
parent cb010ddcb1
commit 85d338a45f
4 changed files with 114 additions and 112 deletions
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5
asm_routines/hgr_offsets.s Normal file
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@ -0,0 +1,5 @@
hgr_offsets:
.word $2000,$2080,$2100,$2180,$2200,$2280,$2300,$2380
.word $2028,$20a8,$2128,$21a8,$2228,$23a8,$2328,$23a8
.word $2050,$20d0,$2150,$21d0,$2250,$22d0,$2350,$23d0

84
asm_routines/hgr_putsprite.s Normal file
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;FIXME -- this doesn't actuall work yet
;=============================================
; hgr_put_sprite
;=============================================
; Sprite to display in INH,INL
; Location is XPOS,YPOS
hgr_put_sprite:
ldy #0 ; byte 0 is xsize ; 2
lda (INL),Y ; 5
sta CH ; xsize is in CH ; 3
iny ; 2
lda (INL),Y ; byte 1 is ysize ; 5
sta CV ; ysize is in CV ; 3
iny ; 2
lda YPOS ; make a copy of ypos ; 3
sta TEMPY ; as we modify it ; 3
;===========
; 28
hgr_put_sprite_loop:
sty TEMP ; save sprite pointer ; 3
lda TEMPY ; load tempy
lsr
lsr ; divide by 8 to get proper row
; but mul by 4 because array is 2byte addr
tay ; put in Y
lda TEMPY
and #$7 ; bottom 3 bits
asl
asl
sta SPRITETEMP
lda hgr_offsets,Y ; lookup hi-res row address ; 5
clc
adc XPOS ; add in XPOS (FIXME: which is div by 7)
sta OUTL ; store out low byte of addy ; 3
lda hgr_offsets+1,Y ; look up high byte ; 5
adc SPRITETEMP
adc DRAW_PAGE ; ; 3
sta OUTH ; and store it out ; 3
ldy TEMP ; restore sprite pointer ; 3
; OUTH:OUTL now points at right place
ldx CH ; load xsize into x ; 3
hgr_put_sprite_pixel:
lda (INL),Y ; get sprite colors ; 5
iny ; increment sprite pointer ; 2
sty TEMP ; save sprite pointer ; 3
ldy #$0 ; 2
sta (OUTL),Y
hgr_put_sprite_done_draw:
ldy TEMP ; restore sprite pointer ; 3
inc OUTL ; increment output pointer ; 5
dex ; decrement x counter ; 2
bne hgr_put_sprite_pixel ; if not done, keep looping ; 2nt/3
inc TEMPY ; 5
dec CV ; decemenet total y count ; 5
bne hgr_put_sprite_loop ; loop if not done ; 2nt/3
rts ; return ; 6

22
asm_routines/hgr_slowclear.s Normal file
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;==========================
; hgr clear
;==========================
hgr_clear:
lda #$00
sta OUTL
lda #$20
sta OUTH
hgr_clear_loop:
lda #$0
sta (OUTL),Y
iny
bne hgr_clear_loop
inc OUTH
lda OUTH
cmp #$40
bne hgr_clear_loop
rts

115
still_alive/ending.s
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@ -31,124 +31,15 @@ infinite_loop:
jmp infinite_loop
;=============================================
; hgr_put_sprite
;=============================================
; Sprite to display in INH,INL
; Location is XPOS,YPOS
hgr_put_sprite:
ldy #0 ; byte 0 is xsize ; 2
lda (INL),Y ; 5
sta CH ; xsize is in CH ; 3
iny ; 2
lda (INL),Y ; byte 1 is ysize ; 5
sta CV ; ysize is in CV ; 3
iny ; 2
lda YPOS ; make a copy of ypos ; 3
sta TEMPY ; as we modify it ; 3
;===========
; 28
hgr_put_sprite_loop:
sty TEMP ; save sprite pointer ; 3
lda TEMPY ; load tempy
lsr
lsr ; divide by 8 to get proper row
; but mul by 4 because array is 2byte addr
tay ; put in Y
lda TEMPY
and #$7 ; bottom 3 bits
asl
asl
sta SPRITETEMP
lda hgr_offsets,Y ; lookup hi-res row address ; 5
clc
adc XPOS ; add in XPOS (FIXME: which is div by 7)
sta OUTL ; store out low byte of addy ; 3
lda hgr_offsets+1,Y ; look up high byte ; 5
adc SPRITETEMP
adc DRAW_PAGE ; ; 3
sta OUTH ; and store it out ; 3
ldy TEMP ; restore sprite pointer ; 3
; OUTH:OUTL now points at right place
ldx CH ; load xsize into x ; 3
hgr_put_sprite_pixel:
lda (INL),Y ; get sprite colors ; 5
iny ; increment sprite pointer ; 2
sty TEMP ; save sprite pointer ; 3
ldy #$0 ; 2
sta (OUTL),Y
hgr_put_sprite_done_draw:
ldy TEMP ; restore sprite pointer ; 3
inc OUTL ; increment output pointer ; 5
dex ; decrement x counter ; 2
bne hgr_put_sprite_pixel ; if not done, keep looping ; 2nt/3
inc TEMPY ; 5
dec CV ; decemenet total y count ; 5
bne hgr_put_sprite_loop ; loop if not done ; 2nt/3
rts ; return ; 6
;==========================
; hgr clear
;==========================
hgr_clear:
lda #$00
sta OUTL
lda #$20
sta OUTH
hgr_clear_loop:
lda #$0
sta (OUTL),Y
iny
bne hgr_clear_loop
inc OUTH
lda OUTH
cmp #$40
bne hgr_clear_loop
rts
sprite:
.byte 1,5
.byte $82,$88,$a0,$88,$82
;===========================
; Set Co-ordinate
;===========================
hgr_offsets:
.word $2000,$2080,$2100,$2180,$2200,$2280,$2300,$2380
.word $2028,$20a8,$2128,$21a8,$2228,226a8,$2328,$23a8
.word $2050,$20d0,$2150,$21d0,$2250,$22d0,$2350,$23d0
.include "../asm_routines/hgr_offsets.s"
.include "../asm_routines/hgr_putsprite.s"
.include "../asm_routines/hgr_slowclear.s"