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firework: done converting launch code

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This commit is contained in:
Vince Weaver 2018-09-05 16:27:42 -04:00
parent ee81b1f97c
commit d8d4ad8f38
1 changed files with 59 additions and 33 deletions
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92
fireworks/fw.s
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@ -23,7 +23,7 @@ Y_OLD = $FB
Y_OLDER = $FC
X_OLD = $FD
X_OLDER = $FE
TEMPY = $FF
;signed char o,i;
@ -159,45 +159,71 @@ draw_rocket_loop:
sta YPOS_H ; adjust ypos
; /* adjust Y velocity, slow it down */
;// c=0;
;// a=y_velocity_l;
;// adc(0x20); // 0x20 = 0.125
;// y_velocity_l=a;
;// a=y_velocity_h;
;// adc(0);
;// y_velocity_h=a;
; sadd16(&y_velocity_h,&y_velocity_l,0x00,0x20);
; adjust Y velocity, slow it down
clc
lda Y_VELOCITY_L
adc #$20 ; $20 = 0.125
sta Y_VELOCITY_L
lda Y_VELOCITY_H
adc #0
sta Y_VELOCITY_H
; /* if we went higher, adjust peak */
; if (ypos_h<peak) peak=ypos_h;
; if we went higher, adjust peak
lda YPOS_H
cmp PEAK
bmi no_peak
sta PEAK
no_peak:
; /* check if out of bounds and stop moving */
; if (xpos_l<=margin) {
; cs=max_steps; // too far left
; }
;========================================
; Check if out of bounds and stop moving
;========================================
; if (xpos_l>=(xsize-margin)) {
; cs=max_steps; // too far right
; }
lda XPOS_L ; if (xpos_l<=margin) too far left
cmp #MARGIN
bcc done_moving
; if (ypos_h<=margin) {
; cs=max_steps; // too far up
; }
; Due to 256 wraparound, the above will catch this case???
; cmp #XSIZE-MARGIN ; if (xpos_l>=(xsize-margin)) too far right
; bcs done_moving
lda YPOS_H ; if (ypos_h<=margin) too far up
cmp #MARGIN
bcc done_moving
; // if falling downward
; if (y_velocity_h>0) {
; // if too close to ground, explode
; if (ypos_h>=ysize-margin) {
; cs=max_steps;
; }
; // if fallen a bit past peak, explode
; if (ypos_h>ysize-(ysize-peak)/2) {
; cs=max_steps;
; }
; }
;======================
; if falling downward
;======================
lda Y_VELOCITY_H
bmi going_up ; if (y_velocity_h>0)
; if too close to ground, explode
lda YPOS_H ; if (ypos_h>=ysize-margin)
cmp #(YSIZE-MARGIN)
bcs done_moving
; if fallen a bit past peak, explode
sec ; if (ypos_h>ysize-(ysize-peak)/2)
lda #YSIZE
sbc PEAK
asl
eor #$FF
clc
adc #1
clc
adc #YSIZE
cmp YPOS_H
bcs done_moving
going_up:
jmp done_bounds_checking
done_moving:
lda MAX_STEPS
sta CURRENT_STEP
done_bounds_checking:
;==========================
; if not done, draw rocket