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space_bars: foolishly adding scaling

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This commit is contained in:
Vince Weaver 2018-10-08 15:33:47 -04:00
parent a49f17d32c
commit 9959b3e2a9
1 changed files with 32 additions and 14 deletions
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46
space_bars/game.s
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@ -292,23 +292,24 @@ sbloopF:dex ; 2
; do_nothing should be 4550
; -3470 draw_framebuffer
; -497 setup framebuffer
; -793 setup framebuffer
; -21 frame count
; -34 keypress
; -1 adjust center mark back
; ===========
; 527
; 231
; Try X=104 Y=1 cycles=527
; Try X=8 Y=5 cycles=231
ldy #1 ; 2
sbloop1:ldx #104 ; 2
ldy #5 ; 2
sbloop1:ldx #8 ; 2
sbloop2:dex ; 2
bne sbloop2 ; 2nt/3
dey ; 2
bne sbloop1 ; 2nt/3
jsr setup_framebuffer ; 6+491
jsr setup_framebuffer ; 6+787
jsr draw_framebuffer ; 6+3464
@ -516,31 +517,48 @@ raster_texture:
.byte $1,$b,$f,$b,$1,$0,$0,$0 ; red
.byte $0,$0,$0,$0,$0,$0,$0,$0,$0
offset_lookup:
; .byte 0,1,2,3,4,5,6,7,8,9,10,11,12
; .byte 13,14,15,16,17,18,19,20,21,22,23,24
; 5 + 37*13 + 5 = 491
.byte 25,24
.byte 23,22,21,20,19,18,17,16,15,14,13,12
.byte 11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
.align $100
; 2 + 60*13 + 5 = 787
setup_framebuffer:
ldx #0 ; 2
ldy FRAMEH ; 3
setup_fb_loop:
tya ; 2
lda offset_lookup,X ; 4
clc ; 2
adc FRAMEH ; 3
and #$3f ; 2
tay ; 2
lda raster_texture,y ; 4
asl ; 2
asl ; 2
asl ; 2
asl ; 2
ora raster_texture+1,y ; 4
pha ; 3
;===========
; 28
lda offset_lookup+1,X ; 4
clc ; 2
adc FRAMEH ; 3
and #$3f ; 2
tay ; 2
pla ; 4
ora raster_texture,y ; 4
sta FRAMEBUFFER,x ; zp ; 4
dey ; 2
dey ; 2
inx ; 2
cpx #13 ; 2
bne setup_fb_loop ; 3
;===========
; 37
; 32
; -1
rts ; 6