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Vesa in nasm

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Join Date: Jan 2007
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tojas tojas is offline Offline
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Vesa in nasm

 
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  #1
Jan 17th, 2007
Hello!

3 weeks ago I started to search the secrets of vesa programming... and now I can forwrd with this problem.. I know I learning very slow, but... I think the important is that I want to learn :mrgreen: So here is my code:
Assembly Syntax (Toggle Plain Text) 
  1. section .code
  2.  
  3.  
  4. start:
  5.   mov	ax,data
  6.   mov	ds,ax
  7.   mov	es,ax
  8.   mov	ax,stack
  9.   mov	ss,ax
  10.   mov	sp,stacktop
  11.   jmp	main
  12.  
  13.  
  14. PutPixel:
  15.   push eax
  16.   push es
  17.   push ecx
  18.   push edx
  19.   push ebx
  20.   lea eax,[edx+4*edx]
  21.   lea eax,[eax+4*eax]
  22.   xor edx,edx
  23.   mov ebx,65536
  24.   shl eax,5
  25.   add eax,ecx  
  26.   div ebx
  27.   mov ecx,edx
  28.   cmp eax,CurBank
  29.   je Lbl
  30.   mov [CurBank],eax
  31.   mov dx,ax
  32.   mov ax,4f05h   ;SetBank
  33.   xor ebx,ebx
  34.   int 10h
  35.   Lbl:
  36.      pop ebx
  37.      mov ax,0A000h
  38.      mov es,ax
  39.      mov [es:ecx],bl 
  40.      pop edx 
  41.      pop ecx
  42.      pop es
  43.      pop eax
  44. ret
  45.  
  46.  
  47. main:
  48.   mov	ax,0x4f02
  49.   mov	bx,0x103
  50.   int	0x10
  51.  
  52. ;-----------------------------------------
  53.       mov bl,1            ;color
  54.       xor edx,edx
  55.       LoopY:
  56.          xor ecx,ecx
  57.          LoopX:
  58.             call PutPixel
  59.             inc ecx
  60.             cmp ecx,800
  61.             jne LoopX
  62.          inc edx
  63.          inc bl
  64.          cmp edx,256
  65.          jne LoopY
  66. ;-----------------------------------------
  67.   xor  ah,ah
  68.   int  16h
  69.  
  70.   xor	ah,ah
  71.   mov	al,0x3
  72.   int	0x10
  73.  
  74.   mov	ax,0x4c00
  75.   int	0x21
  76.  
  77.  
  78. section  .data
  79.   s		resb	256
  80.   CurBank  dd 	0
  81. section .stack stack
  82.  resb 2048
  83. stacktop:

I wrote this code in nasm. And then used tlink. The problem is that this is very very slow for filling the screen... I know that I have to use the video memory.. but I can't.. I read many tutorials but I still can't use.. Tutorials didn't write an example
Please if somebody can help me to do a faster code or something... Thanks in forward
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lewiscowles lewiscowles is offline Offline
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Re: Vesa in nasm

 
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  #2
Apr 8th, 2009
hi you should change the code
Assembly Syntax (Toggle Plain Text) 
  1. mov ax,4f05h   ;SetBank
to read
Assembly Syntax (Toggle Plain Text) 
  1. mov ax,4f02h   ;SetBank
I think the problem is your bios support for vesain mode 4f05h
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