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split: it works!

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This commit is contained in:
Vince Weaver 2018-07-06 01:22:32 -04:00
parent 403a612f94
commit 596b1dbcc7
2 changed files with 150 additions and 153 deletions
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2
split_screen/calc_freq.c
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@ -9,7 +9,7 @@ int main(int argc, char **argv) {
// desired=5196;
// desired=4547;
// desired=9685;
desired=827;
desired=429;
printf("You want %d cycles\n",desired);

301
split_screen/credits.s
View File

@ -242,17 +242,154 @@ loop1:
bit SET_GR ; 4
; want 4160-8 = 4152 cycles
; 1+y(6+5x)
; Try X=91 Y=9 cycles=4150, R2
;================
; Draw Big Tree
lda #>big_tree ; 2
sta INH ; 3
lda #<big_tree ; 2
sta INL ; 3
lda TREE2X ; 3
sta XPOS ; 3
lda #30 ; 2
sta YPOS ; 3
jsr put_sprite ; 6
;=========
; 27
; + 1410
;========
; 1437
lda FRAME ; 3
and #$1f ; 2
and #$10 ; 2
beq bird_walking
; 2
lda #>bird_rider_stand_right ; 2
sta INH ; 3
lda #<bird_rider_stand_right ; 2
sta INL ; 3
jmp draw_bird ; 3
bird_walking:
; 3
lda #>bird_rider_walk_right ; 2
sta INH ; 3
lda #<bird_rider_walk_right ; 2
sta INL ; 3
; must be 15
lda #0 ; 2
; Must add another 15 as sprite is different
inc XPOS ; 5
inc XPOS ; 5
inc XPOS ; 5
draw_bird:
; 15 + 7
lda #17 ; 2
sta XPOS ; 3
lda #30 ; 2
sta YPOS ; 3
jsr put_sprite ; 6
;=========
; 38
; + 2190
;========
; 2228
;==========================
; Update frame = 13 cycles
inc FRAME ; frame++ ; 5
lda FRAME ; 3
and #$3f ; roll over after 63 ; 2
sta FRAME ; 3
;===========
; 13
;===========================
; Update tree1 = 21 cycles
and #$3f ; if (frame%64==0) ; 2
beq dec_tree1
; 2
; need to do 19-5 cycles of nonsense
inc TREE1X ; 5
dec TREE1X ; 5
lda #0 ; 2
lda #0 ; 2
jmp done_tree1 ; 3
dec_tree1:
; 3
dec TREE1X ; tree1_x-- ; 5
lda TREE1X ; 3
bmi tree1_neg
; 2
ldx TREE1X ; 3
jmp done_tree1 ; 3
tree1_neg:
; incoming br 3
ldx #37 ; 2
stx TREE1X ; 3
done_tree1:
;===========================
; Update tree2 = 24 cycles
lda FRAME ; 3
and #$f ; if (frame%16==0) ; 2
beq dec_tree2
; 2
; need to do 19-5 cycles of nonsense
inc TREE2X ; 5
dec TREE2X ; 5
lda #0 ; 2
lda #0 ; 2
jmp done_tree2 ; 3
dec_tree2:
; 3
dec TREE2X ; tree2_x-- ; 5
lda TREE2X ; 3
bmi tree2_neg
; 2
ldx TREE2X ; 3
jmp done_tree2 ; 3
tree2_neg:
; incoming br 3
ldx #37 ; 2
stx TREE2X ; 3
done_tree2:
; want 4160
; Tree2 Sprite -1437
; Sprite -2228
; Frame Update -13
; Tree1 Update -21
; Tree2 Update -24
; hgr bits -8
; ====================== 429 cycles
; Try X=13 Y=6 cycles=427 R2
lda #0 ; 2
ldy #9 ; 2
ldy #6 ; 2
loop3:
ldx #91 ; 2
ldx #13 ; 2
loop4:
dex ; 2
bne loop4 ; 2nt/3
@ -295,166 +432,26 @@ loop6:
;=========================================================================
; DRAW SPRITES
; do this during blanking interval
; color_equals(4);
; for(i=28;i<48;i++) {
; basic_hlin(0,39,i);
; }
;================
; Draw Big Tree
lda #>big_tree ; 2
sta INH ; 3
lda #<big_tree ; 2
sta INL ; 3
lda TREE2X ; 3
sta XPOS ; 3
lda #30 ; 2
sta YPOS ; 3
jsr put_sprite ; 6
;=========
; 27
; + 1410
;========
; 1437
lda FRAME ; 3
and #$7 ; 2
and #4 ; 2
beq bird_walking
; 2
lda #>bird_rider_stand_right ; 2
sta INH ; 3
lda #<bird_rider_stand_right ; 2
sta INL ; 3
jmp draw_bird ; 3
bird_walking:
; 3
lda #>bird_rider_walk_right ; 2
sta INH ; 3
lda #<bird_rider_walk_right ; 2
sta INL ; 3
; must be 15
lda #0 ; 2
; Must add another 15 as sprite is different
inc XPOS ; 5
inc XPOS ; 5
inc XPOS ; 5
draw_bird:
; 15 + 7
lda #17 ; 2
sta XPOS ; 3
lda #30 ; 2
sta YPOS ; 3
jsr put_sprite ; 6
;=========
; 38
; + 2190
;========
; 2228
; Blanking time: 4550
; Tree2 Sprite -1437
; Sprite -2228
; Frame Update -13
; Tree1 Update -21
; Tree2 Update -21
; JMP at end -3
;========================4547 cycles
; 827 is new number
; Try X=164 Y=1 cycles=827
; Try X=13 Y=64 cycles=4545 R2
lda #0 ; 2
; lda #0 ; 2
; lda #0 ; 2
ldy #1 ; 2
ldy #64 ; 2
loop7:
ldx #164 ; 2
ldx #13 ; 2
loop8:
dex ; 2
bne loop8 ; 2nt/3
dey ; 2
bne loop7 ; 2nt/3
;==========================
; Update frame = 13 cycles
inc FRAME ; frame++ ; 5
lda FRAME ; 3
and #$1f ; roll over after 31 ; 2
sta FRAME ; 3
;===========
; 13
;===========================
; Update tree2 = 21 cycles
and #3 ; if (frame%4==0) ; 2
beq dec_tree2
; 2
; need to do 19-5 cycles of nonsense
inc TREE2X ; 5
dec TREE2X ; 5
lda #0 ; 2
lda #0 ; 2
jmp done_tree2 ; 3
dec_tree2:
; 3
dec TREE2X ; tree2_x-- ; 5
lda TREE2X ; 3
bmi tree2_neg
; 2
ldx TREE2X ; 3
jmp done_tree2 ; 3
tree2_neg:
; incoming br 3
ldx #37 ; 2
stx TREE2X ; 3
done_tree2:
;===========================
; Update tree1 = 21 cycles
and #$f ; if (frame%16==0) ; 2
beq dec_tree1
; 2
; need to do 19-5 cycles of nonsense
inc TREE1X ; 5
dec TREE1X ; 5
lda #0 ; 2
lda #0 ; 2
jmp done_tree1 ; 3
dec_tree1:
; 3
dec TREE1X ; tree1_x-- ; 5
lda TREE1X ; 3
bmi tree1_neg
; 2
ldx TREE1X ; 3
jmp done_tree1 ; 3
tree1_neg:
; incoming br 3
ldx #37 ; 2
stx TREE1X ; 3
done_tree1:
jmp display_loop ; 3