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need help generating graphic

 
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  #1
Nov 11th, 2008
I'm having trouble with drawing squares on the x86 assembler using the XGA 8-bit linear frame buffer. I'm suppose to draw a large square containing a grid of smaller 12x12 squares using my own functions and this is what I have so far:

Assembly Syntax (Toggle Plain Text) 
  1. [SECTION .text]
  2. ;----------------------------------------------------------------------------
  3.  
  4. ; code belongs in this section starting here
  5.  
  6. mystart:
  7.          mov  ah, 0fh             ; BIOS function - get current video mode
  8.          int  10h                 ; call BIOS video interrupt
  9.          mov  [vidmode], al       ; save the current video mode
  10.  
  11.          mov  eax, 4f02h          ; SVGA function - set SVGA video mode
  12.          mov  ebx, XGAMODE        ; select XGA video mode
  13.          int  10h                 ; call BIOS video interrupt
  14.  
  15.  
  16.           mov ecx, 12	
  17.           mov eax, xPos
  18.  
  19. sqrver:         
  20.          push ecx
  21.  
  22.          mov ebx, yPos
  23.          mov ecx, width
  24.  
  25.          mov edx, eax
  26.  
  27.          push eax
  28.          mov eax, ebx
  29.          mov ebx, XGAXRES
  30.          mul ebx
  31.          pop ebx
  32.          add eax, ebx
  33.  
  34. vloop:
  35.          mov byte [fs:eax], 15
  36.          add dword eax, 800
  37.          dec ecx
  38.  
  39.          jnz vloop            
  40.  
  41.          add dword eax, 5
  42.          pop ecx
  43.          loop sqrver
  44.  
  45.          mov ecx, 12
  46.          mov ebx, yPos
  47.  
  48. sqrhori:         
  49.          push ecx
  50.  
  51.          mov eax, xPos
  52.          mov ecx, width
  53.  
  54.          mov edx, ebx
  55.  
  56.          push eax
  57.          mov eax, ebx
  58.          mov ebx, XGAXRES
  59.          mul ebx
  60.          pop ebx
  61.          add eax, ebx
  62.  
  63. hloop:
  64.          mov byte [fs:eax], 15
  65.          inc eax
  66.          dec ecx
  67.  
  68.          jnz hloop            
  69.  
  70.          add dword ebx, 5
  71.          pop ecx
  72.          loop sqrver
  73.  
  74.  
  75.          mov  ah, 1               ; select DOS function - input character
  76.          int  0f1h                ; call OS function to wait for key press
  77.  
  78.          mov  ah, 00h             ; BIOS function - set video mode
  79.          mov  al, [vidmode]       ; restore the old video mode
  80.          int  10h                 ; call BIOS video interrupt
  81.  
  82.          ret
  83.  
  84. ;----------------------------------------------------------------------------
  85. [SECTION .data]
  86. ;----------------------------------------------------------------------------
  87.  
  88. ; all initialized data variables and constant definitions go here
  89.  
  90. XGAMODE  equ  4103h               ; XGA video mode code (w/ linear addr bit)
  91. XGAXRES  equ  800                ; horizontal resolution of XGA screen
  92. XGAYRES  equ  600                 ; vertical resolution of XGA screen
  93.  
  94. xPos     db  300
  95. yPos     db  50
  96. width    equ  400
  97.  
  98. ;----------------------------------------------------------------------------
  99. [SECTION .bss]
  100. ;----------------------------------------------------------------------------
  101.  
  102. ; all uninitialized data elements go here
  103.  
  104. vidmode  resb 1                   ; the old video mode

When I try to run it, only a few lines appear on the screen and the program lags for a bit before exiting...

Any help would be appreciated.
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