projects
/
vtuts
/ commitdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
| commitdiff |
tree
raw
|
patch
|
inline
| side by side (parent:
e410cee
)
bummed some more
author
John Tsiombikas
<nuclear@member.fsf.org>
Thu, 27 Feb 2020 02:31:26 +0000
(
04:31
+0200)
committer
John Tsiombikas
<nuclear@member.fsf.org>
Thu, 27 Feb 2020 02:31:26 +0000
(
04:31
+0200)
dos1/c.asm
patch
|
blob
|
history
diff --git
a/dos1/c.asm
b/dos1/c.asm
index
d7a228f
..
fb0214f
100644
(file)
--- a/
dos1/c.asm
+++ b/
dos1/c.asm
@@
-1,4
+1,4
@@
-; Lowest yet: 277
+; Lowest yet: 270
bits 16
%ifdef BOOTSECT
bits 16
%ifdef BOOTSECT
@@
-41,12
+41,6
@@
start:
add ax, 1000h
mov es, ax
add ax, 1000h
mov es, ax
- ; setup palette for the effect
- ; - bg color (0)
- ; - shadow color (1)
- ; - fractal color (2)
-
-
mainloop:
call animate
mainloop:
call animate
@@
-144,16
+138,21
@@
sierp_vel:
dw 1, 1
dw -1, 1
dw -1, -1
dw 1, 1
dw -1, 1
dw -1, -1
+bounds dw 200 - SHADOW_OFFS
+ dw 320 - SHADOW_OFFS
+
animate:
mov cx, 3
mov di, sierp_verts
mov si, sierp_vel
.loop:
animate:
mov cx, 3
mov di, sierp_verts
mov si, sierp_vel
.loop:
+ mov ebx, 2
+.xyloop:
mov ax, [di] ; grab vertex X
add ax, [si] ; add velocity X
jl .xout
mov ax, [di] ; grab vertex X
add ax, [si] ; add velocity X
jl .xout
- cmp ax, 320-SHADOW_OFFS
+ cmp ax, [ebx * 2 + bounds - 2]
jge .xout
jmp .skip_xflip
.xout:
jge .xout
jmp .skip_xflip
.xout:
@@
-165,20
+164,9
@@
animate:
; to do the same for Y increment edi and esi by 2
add di, 2
add si, 2
; to do the same for Y increment edi and esi by 2
add di, 2
add si, 2
- mov ax, [di] ; grab vertex Y
- add ax, [si] ; add velocity Y
- jl .yout
- cmp ax, 200-SHADOW_OFFS
- jge .yout
- jmp .skip_yflip
-.yout:
- sub ax, [si] ; revert to previous Y
- neg word [si] ; negate velocity Y
-.skip_yflip:
- mov [di], ax ; update vertex Y
+ dec bx
+ jnz .xyloop
- add di, 2
- add si, 2
dec cx
jnz .loop
ret
dec cx
jnz .loop
ret