Rooba
/
ReC98
mirror of https://github.com/nmlgc/ReC98.git
1
1
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[Decompilation] [th05] Line sets: Copying lines up by 1 element 

Which can't be a class method, but only because CX and DX would be
swapped then… yup.

Part of P0110, funded by [Anonymous] and Blue Bolt.
This commit is contained in:
nmlgc 2020-08-19 15:14:48 +02:00
parent 2ef3db3052
commit 9e06c45656
2 changed files with 15 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
th05/main/boss/render.cpp
View File

@ -60,3 +60,13 @@ void pascal near grcg_lineset_line_put(lineset_t near &set, int i)
grcg_line(x1, y1, x2, y2);
}
// Copies lines [0; 17] to lines [1..18].
void pascal near lineset_forward_copy(lineset_t near &set)
{
for(int i = (LINESET_LINE_COUNT - 2); i > 0; i--) {
set.center[i] = set.center[i - 1];
set.angle[i] = set.angle[i - 1];
set.radius[i].v = set.radius[i - 1].v;
}
}

61
th05_main.asm
View File

@ -4029,60 +4029,12 @@ sub_D3C6 endp
GRCG_LINESET_LINE_PUT procdesc pascal near \
set:near ptr, i:word
LINESET_FORWARD_COPY procdesc pascal near \
set:near ptr
main__TEXT ends
main_0_TEXT segment word public 'CODE' use16
; =============== S U B R O U T I N E =======================================
; Attributes: bp-based frame
sub_D598 proc near
@@set = word ptr 4
push bp
mov bp, sp
mov cx, [bp+@@set]
mov dx, (LINESET_LINE_COUNT - 2)
jmp short loc_D5DA
; ---------------------------------------------------------------------------
loc_D5A3:
mov bx, dx
dec bx
shl bx, 2
add bx, cx
mov eax, dword ptr [bx+lineset_t.LS_center]
mov bx, dx
shl bx, 2
add bx, cx
mov dword ptr [bx+lineset_t.LS_center], eax
mov bx, cx
add bx, dx
mov al, [bx+(lineset_t.LS_angle - 1)]
mov bx, cx
add bx, dx
mov [bx+(lineset_t.LS_angle - 0)], al
mov bx, dx
dec bx
add bx, bx
add bx, cx
mov ax, [bx+lineset_t.LS_radius]
mov bx, dx
add bx, bx
add bx, cx
mov [bx+lineset_t.LS_radius], ax
dec dx
loc_D5DA:
or dx, dx
jg short loc_D5A3
pop bp
retn 2
sub_D598 endp
; =============== S U B R O U T I N E =======================================
; Attributes: bp-based frame
@ -4099,8 +4051,7 @@ sub_D5E2 proc near
; ---------------------------------------------------------------------------
loc_D5F1:
push si
call sub_D598
call lineset_forward_copy pascal, si
add [si+lineset_t.LS_radius], (4 shl 4)
push si
push ((192 shl 4) shl 16) or (184 shl 4)
@ -4285,8 +4236,7 @@ var_2 = word ptr -2
; ---------------------------------------------------------------------------
loc_D789:
push si
call sub_D598
call lineset_forward_copy pascal, si
mov ax, [si+lineset_t.LS_velocity_y]
add [si+lineset_t.LS_center.y], ax
cmp [si+lineset_t.LS_velocity_y], (-14 shl 4)
@ -4469,8 +4419,7 @@ var_2 = word ptr -2
; ---------------------------------------------------------------------------
loc_D8EE:
push si
call sub_D598
call lineset_forward_copy pascal, si
mov ax, [si+lineset_t.LS_velocity_y]
add [si+lineset_t.LS_center.y], ax
cmp [si+lineset_t.LS_velocity_y], (14 shl 4)