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Rev 49 Rev 112
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;
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; Call of videomode driver's functions
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; Call of videomode driver's functions
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;
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;
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; (Add in System function 21 (and/or 26) as a subfunction 13)
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; (Add in System function 21 (and/or 26) as a subfunction 13)
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;
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;
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; Author: Trans
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; Author: Trans
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; Date:  19.07.2003
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; Date:  19.07.2003
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;
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;
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; Include in MeOS kernel and compile with FASM
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; Include in MeOS kernel and compile with FASM
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;
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;
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uglobal
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uglobal
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  old_screen_width  dd ?
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  old_screen_width  dd ?
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  old_screen_height dd ?
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  old_screen_height dd ?
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endg
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endg
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     cmp  eax,13                 ; CALL VIDEOMODE DRIVER FUNCTIONS
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     cmp  eax,13                 ; CALL VIDEOMODE DRIVER FUNCTIONS
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     jne  .no_vmode_drv_access
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     jne  .no_vmode_drv_access
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	pushd	[0x0000fe00] [0x0000fe04]
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	pushd	[0x0000fe00] [0x0000fe04]
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	popd	[old_screen_height] [old_screen_width]
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	popd	[old_screen_height] [old_screen_width]
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     or   eax,-1                 ; If driver is absent then eax does not change
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     or   eax,-1                 ; If driver is absent then eax does not change
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     call 0x760100               ; Entry point of video driver
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     call 0x760100               ; Entry point of video driver
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     mov  [esp+36],eax
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     mov  [esp+36],eax
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     mov  [esp+24],ebx
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     mov  [esp+24],ebx
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     mov  [esp+32],ecx
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     mov  [esp+32],ecx
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;    mov  [esp+28],edx
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;    mov  [esp+28],edx
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	mov	eax,[old_screen_width]
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	mov	eax,[old_screen_width]
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	mov	ebx,[old_screen_height]
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	mov	ebx,[old_screen_height]
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	sub	eax,[0x0000fe00]
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	sub	eax,[0x0000fe00]
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	jnz	@f
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	jnz	@f
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	sub	ebx,[0x0000fe04]
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	sub	ebx,[0x0000fe04]
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	jz	.resolution_wasnt_changed
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	jz	.resolution_wasnt_changed
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	jmp	.lp1
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	jmp	.lp1
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    @@: sub	ebx,[0x0000fe04]
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    @@: sub	ebx,[0x0000fe04]
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  .lp1: sub	[screen_workarea.right],eax
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  .lp1: sub	[screen_workarea.right],eax
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	sub	[screen_workarea.bottom],ebx
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	sub	[screen_workarea.bottom],ebx
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	call	repos_windows
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	call	repos_windows
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        mov     eax, 0
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        mov     ebx, 0
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        mov     ecx, [0xfe00]
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        mov     edx, [0xfe04]
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	call	calculatescreen
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	call	calculatescreen
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  .resolution_wasnt_changed:
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  .resolution_wasnt_changed:
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     ret
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     ret
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   .no_vmode_drv_access:
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   .no_vmode_drv_access: