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WiESi



Joined: 15 May 2006
Posts: 14
Location: Austria
WiESi
Hello!

I'm currently trying to write a little game in fasm. The game is running in mode 13h but the point I'm painting to the screen is blinking and I don't want that. How do I prevent the point (or all the stuff on the screen) from blinking?

Here's the code so far:
Code:
org 100h

start:
  mov al, 13h
  int 10h

jmp main

x dw 160
y dw 190

main:
  mov ax, 0a000h
  mov es, ax

  mov cx, 16000
  xor di, di
  xor ax, ax
  cld
  rep stosd

  mov ax, 320
  mul [y]
  add ax, [x]

  mov [es:eax], byte 15

  key_loop:
    pause
    in al, 60h
    cmp al, 0
    je key_loop
  cmp al, 1
  je quit
  cmp al, 4bh
  je key_left
  cmp al, 4dh
  je key_right
  cmp al, 48h
  je key_up
  cmp al, 50h
  je key_down
  jmp main

quit:
  mov ax, 4C00h
  int 21h

key_left:
  cmp [x], 0
  jle key_left2
  dec [x]
  jmp main
  key_left2:
    mov [x], 319
    jmp main

key_right:
  cmp [x], 319
  jae key_right2
  inc [x]
  jmp main
  key_right2:
    mov [x], 0
    jmp main

key_up:
  cmp [y], 0
  jle key_up2
  dec [y]
  jmp main
  key_up2:
    mov [y], 199
    jmp main

key_down:
  cmp [y], 199
  jae key_down2
  inc [y]
  jmp main
  key_down2:
    mov [y], 0
    jmp main    


Regards,
WiESi

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JavaAmp
Post 21 May 2006, 17:24
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donkey7



Joined: 31 Jan 2005
Posts: 127
Location: Poland, Malopolska
donkey7
1. use backbuffer
2. write this:
Code:
wait_vr:
        mov     edx, 03dah
wvr_1:
        in      al, dx
        test    al, 8
        jz      wvr_1
wvr_2:
        in      al, dx
        test    al, 8
        jnz     wvr_2
        ret
    

before copying backbuffer to vga buffer.

or

1. move this piece of code:
Code:
  mov ax, 0a000h 
  mov es, ax 

  mov cx, 16000 
  xor di, di 
  xor ax, ax 
  cld 
  rep stosd
    

before main
2. replace this:
Code:
  mov [es:eax], byte 15 

  key_loop: 
    pause 
    in al, 60h 
    cmp al, 0 
    je key_loop
    

with:
Code:
  mov [es:eax], byte 15 
  push eax
  key_loop: 
    pause 
    in al, 60h 
    cmp al, 0 
    je key_loop
  pop eax
  mov [es:eax], byte 0 
    
Post 21 May 2006, 17:52
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