vifade.c
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/*====================================================================
* vifade.c
*
* Copyright 1995, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
* Inc.; the contents of this file may not be disclosed to third
* parties, copied or duplicated in any form, in whole or in part,
* without the prior written permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to
* restrictions as set forth in subdivision (c)(1)(ii) of the Rights
* in Technical Data and Computer Software clause at DFARS
* 252.227-7013, and/or in similar or successor clauses in the FAR,
* DOD or NASA FAR Supplement. Unpublished - rights reserved under the
* Copyright Laws of the United States.
*====================================================================*/
/**************************************************************************
*
* $Revision: 1.1.1.2 $
* $Date: 2002/10/29 08:06:43 $
* $Source: /root/leakn64/depot/rf/sw/bbplayer/libultra/monegi/vi/vifade.c,v $
*
**************************************************************************/
#include "osint.h"
#include "rcp.h"
#include "viint.h"
#include "assert.h"
/*
* Name: osViFade
*
* Description:
* Based on the 10-bit fractional interpolation factor, fades between the
* first 2 scan lines in frame buffer.
*
* Globals Referenced:
* __osViNext
*/
void
osViFade(u8 active, u16 factor)
{
register u32 saveMask;
saveMask = __osDisableInt();
if (active) {
__osViNext->y.offset = (u16)(factor & 0x03FF); /* 10-bit fraction */
__osViNext->state |= VI_STATE_FADE;
}
else
__osViNext->state &= ~VI_STATE_FADE;
__osRestoreInt(saveMask);
} /* osViFade */