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  1. ;
  2. ; Call of videomode driver's functions
  3. ;
  4. ; (Add in System function 21 (and/or 26) as a subfunction 13)
  5. ;
  6. ; Author: Trans
  7. ; Date:  19.07.2003
  8. ;
  9. ; Include in MeOS kernel and compile with FASM
  10. ;
  11.  
  12. uglobal
  13.   old_screen_width  dd ?
  14.   old_screen_height dd ?
  15. endg
  16.  
  17.      cmp  eax,13                 ; CALL VIDEOMODE DRIVER FUNCTIONS
  18.      jne  .no_vmode_drv_access
  19.         pushd   [0x0000fe00] [0x0000fe04]
  20.         popd    [old_screen_height] [old_screen_width]
  21.      or   eax,-1                 ; If driver is absent then eax does not change
  22.      call 0x760100               ; Entry point of video driver
  23.      mov  [esp+36],eax
  24.      mov  [esp+24],ebx
  25.      mov  [esp+32],ecx
  26. ;    mov  [esp+28],edx
  27.         mov     eax,[old_screen_width]
  28.         mov     ebx,[old_screen_height]
  29.         sub     eax,[0x0000fe00]
  30.         jnz     @f
  31.         sub     ebx,[0x0000fe04]
  32.         jz      .resolution_wasnt_changed
  33.         jmp     .lp1
  34.     @@: sub     ebx,[0x0000fe04]
  35.   .lp1: sub     [screen_workarea.right],eax
  36.         sub     [screen_workarea.bottom],ebx
  37.  
  38.         call    repos_windows
  39.         call    calculatescreen
  40.  
  41.   .resolution_wasnt_changed:
  42.      ret
  43.    .no_vmode_drv_access:
  44.