add: if (si->ps.secondary_head) { switch (si->dm.flags & DUALHEAD_BITS) { case DUALHEAD_ON: case DUALHEAD_SWITCH: if ((si->overlay.ow.h_start + (si->overlay.ow.width / 2)) < (si->dm.h_display_start + si->dm.timing.h_display)) nv_bes_to_crtc(si->crtc_switch_mode); else nv_bes_to_crtc(!si->crtc_switch_mode); break; default: nv_bes_to_crtc(si->crtc_switch_mode); break; } }
context: void nv_bes_move_overlay(){	/* calculated BES register values */	uint32 	hcoordv, vcoordv, hsrcstv, a1orgv, v1srcstv;	/* misc used variables */	uint16 temp1, temp2;	/* visible screen window in virtual workspaces */	uint16 crtc_hstart, crtc_vstart, crtc_hend, crtc_vend;	/* abort if overlay is not active */	if (!si->overlay.active) return;	/* the BES does not respect virtual_workspaces, but adheres to CRTC	 * constraints only */	crtc_hstart = si->dm.h_display_start;	/* make dualhead stretch and switch mode work while we're at it.. */	if (si->overlay.crtc)	{		crtc_hstart += si->dm.timing.h_display;	}	/* horizontal end is the first position beyond the displayed range on the CRTC */	crtc_hend = crtc_hstart + si->dm.timing.h_display;	crtc_vstart = si->dm.v_display_start;	/* vertical end is the first position beyond the displayed range on the CRTC */	crtc_vend = crtc_vstart + si->dm.timing.v_display;	/****************************************	 *** setup all edges of output window ***	 ****************************************/	/* setup left and right edges of output window */	hcoordv = 0;	/* left edge coordinate of output window, must be inside desktop */	/* clipping on the left side */	if (si->overlay.ow.h_start < crtc_hstart)	{		temp1 = 0;	}	else	{		/* clipping on the right side */		if (si->overlay.ow.h_start >= (crtc_hend - 1))		{			/* width < 2 is not allowed */			temp1 = (crtc_hend - crtc_hstart - 2) & 0x7ff;		} 		else		/* no clipping here */		{			temp1 = (si->overlay.ow.h_start - crtc_hstart) & 0x7ff;		}	} 	hcoordv |= temp1 << 16;	/* right edge coordinate of output window, must be inside desktop */	/* width < 2 is not allowed */	if (si->overlay.ow.width < 2) 	{		temp2 = (temp1 + 1) & 0x7ff;	}	else 	{		/* clipping on the right side */		if ((si->overlay.ow.h_start + si->overlay.ow.width - 1) > (crtc_hend - 1))		{			temp2 = (crtc_hend - crtc_hstart - 1) & 0x7ff;		}		else		{			/* clipping on the left side */			if ((si->overlay.ow.h_start + si->overlay.ow.width - 1) < (crtc_hstart + 1))			{				/* width < 2 is not allowed */				temp2 = 1;			}			else			/* no clipping here */			{				temp2 = ((uint16)(si->overlay.ow.h_start + si->overlay.ow.width - crtc_hstart - 1)) & 0x7ff;			}		}	}	hcoordv |= temp2 << 0;	LOG(4,("Overlay: CRTC left-edge output %d, right-edge output %d\n",temp1, temp2));	/* setup top and bottom edges of output window */	vcoordv = 0;	/* top edge coordinate of output window, must be inside desktop */	/* clipping on the top side */	if (si->overlay.ow.v_start < crtc_vstart)	{		temp1 = 0;	}	else	{		/* clipping on the bottom side */		if (si->overlay.ow.v_start >= (crtc_vend - 1))		{			/* height < 2 is not allowed */			temp1 = (crtc_vend - crtc_vstart - 2) & 0x7ff;		} 		else		/* no clipping here */		{			temp1 = (si->overlay.ow.v_start - crtc_vstart) & 0x7ff;		}	} 	vcoordv |= temp1 << 16;	/* bottom edge coordinate of output window, must be inside desktop */	/* height < 2 is not allowed */	if (si->overlay.ow.height < 2) 	{		temp2 = (temp1 + 1) & 0x7ff;	}	else 	{		/* clipping on the bottom side */		if ((si->overlay.ow.v_start + si->overlay.ow.height - 1) > (crtc_vend - 1))		{			temp2 = (crtc_vend - crtc_vstart - 1) & 0x7ff;		}		else		{			/* clipping on the top side */			if ((si->overlay.ow.v_start + si->overlay.ow.height - 1) < (crtc_vstart + 1))			{				/* height < 2 is not allowed */				temp2 = 1;			}			else			/* no clipping here */			{				temp2 = ((uint16)(si->overlay.ow.v_start + si->overlay.ow.height - crtc_vstart - 1)) & 0x7ff;			}		}	}	vcoordv |= temp2 << 0;	LOG(4,("Overlay: CRTC top-edge output %d, bottom-edge output %d\n",temp1, temp2));	/*********************************	 *** setup horizontal clipping ***	 *********************************/	/* Setup horizontal source start: first (sub)pixel contributing to output picture */	/* Note:	 * The method is to calculate, based on 1:1 scaling, based on the output window.	 * After this is done, include the scaling factor so you get a value based on the input bitmap.	 * Then add the left starting position of the bitmap's view (zoom function) to get the final value needed.	 * Note: The input bitmaps slopspace is automatically excluded from the calculations this way! */	/* Note also:	 * Even if the scaling factor is clamping we instruct the BES to use the correct source start pos.! */	hsrcstv = 0;	/* check for destination horizontal clipping at left side */	if (si->overlay.ow.h_start < crtc_hstart)	{		/* check if entire destination picture is clipping left:		 * (2 pixels will be clamped onscreen at least) */		if ((si->overlay.ow.h_start + si->overlay.ow.width - 1) < (crtc_hstart + 1))		{			/* increase 'first contributing pixel' with 'fixed value': (total dest. width - 2) */			hsrcstv += (si->overlay.ow.width - 2);		}		else		{			/* increase 'first contributing pixel' with actual number of dest. clipping pixels */			hsrcstv += (crtc_hstart - si->overlay.ow.h_start);		}		LOG(4,("Overlay: clipping left...\n"));		/* The calculated value is based on scaling = 1x. So we now compensate for scaling.		 * Note that this also already takes care of aligning the value to the BES register! */		hsrcstv *= si->overlay.h_ifactor;	}	/* take zoom into account */	hsrcstv += ((uint32)si->overlay.my_ov.h_start) << 16;	/* AND below required by hardware */	hsrcstv &= 0x03fffffc;	LOG(4,("Overlay: first hor. (sub)pixel of input bitmap contributing %f\n", hsrcstv / (float)65536));	/*******************************	 *** setup vertical clipping ***	 *******************************/	/* calculate inputbitmap origin adress */	a1orgv = (uint32)((vuint32 *)si->overlay.ob.buffer);	a1orgv -= (uint32)((vuint32 *)si->framebuffer);	/* Setup vertical source start: first (sub)pixel contributing to output picture. */	/* Note:	 * The method is to calculate, based on 1:1 scaling, based on the output window.	 * 'After' this is done, include the scaling factor so you get a value based on the input bitmap. 	 * Then add the top starting position of the bitmap's view (zoom function) to get the final value needed. */	/* Note also:	 * Even if the scaling factor is clamping we instruct the BES to use the correct source start pos.! */	v1srcstv = 0;	/* check for destination vertical clipping at top side */	if (si->overlay.ow.v_start < crtc_vstart)	{		/* check if entire destination picture is clipping at top:		 * (2 pixels will be clamped onscreen at least) */		if ((si->overlay.ow.v_start + si->overlay.ow.height - 1) < (crtc_vstart + 1))		{			/* increase 'number of clipping pixels' with 'fixed value':			 * 'total height - 2' of dest. picture in pixels * inverse scaling factor */			v1srcstv = (si->overlay.ow.height - 2) * si->overlay.v_ifactor;			/* on pre-NV10 we need to do clipping in the source			 * bitmap because no seperate clipping registers exist... */			if (si->ps.card_arch < NV10A)				a1orgv += ((v1srcstv >> 16) * si->overlay.ob.bytes_per_row);		}		else		{			/* increase 'first contributing pixel' with:			 * number of destination picture clipping pixels * inverse scaling factor */			v1srcstv = (crtc_vstart - si->overlay.ow.v_start) * si->overlay.v_ifactor;			/* on pre-NV10 we need to do clipping in the source			 * bitmap because no seperate clipping registers exist... */			if (si->ps.card_arch < NV10A)				a1orgv += ((v1srcstv >> 16) * si->overlay.ob.bytes_per_row);		}		LOG(4,("Overlay: clipping at top...\n"));	}	/* take zoom into account */	v1srcstv += (((uint32)si->overlay.my_ov.v_start) << 16);	if (si->ps.card_arch < NV10A)	{		a1orgv += (si->overlay.my_ov.v_start * si->overlay.ob.bytes_per_row);		LOG(4,("Overlay: 'contributing part of buffer' origin is (cardRAM offset) $%08x\n", a1orgv));	}	LOG(4,("Overlay: first vert. (sub)pixel of input bitmap contributing %f\n", v1srcstv / (float)65536));	/* AND below is probably required by hardware. */	/* Buffer A topleft corner of field 1 (origin)(field 1 contains our full frames) */	a1orgv &= 0xfffffff0;	LOG(4,("Overlay: topleft corner of input bitmap (cardRAM offset) $%08x\n",a1orgv));	/*************************************	 *** sync to BES (Back End Scaler) ***	 *************************************/	/* Done in card hardware:	 * double buffered registers + trigger if programming complete feature. */	/**************************************	 *** actually program the registers ***	 **************************************/	if (si->ps.card_arch < NV10A)	{		/* unknown, but needed (otherwise high-res distortions and only half the frames */		BESW(NV04_OE_STATE, 0x00000000);		/* select buffer 0 as active (b16) */		BESW(NV04_SU_STATE, 0x00000000);		/* unknown (no effect?) */		BESW(NV04_RM_STATE, 0x00000000);		/* setup clipped(!) buffer startadress in RAM */		/* RIVA128 - TNT bes doesn't have clipping registers, so no subpixelprecise clipping		 * either. We do pixelprecise vertical and 'two pixel' precise horizontal clipping here. */		/* (program both buffers to prevent sync distortions) */		/* first include 'pixel precise' left clipping... (top clipping was already included) */		a1orgv += ((hsrcstv >> 16) * 2);		/* we need to step in 4-byte (2 pixel) granularity due to the nature of yuy2 */		BESW(NV04_0BUFADR, (a1orgv & ~0x03));		BESW(NV04_1BUFADR, (a1orgv & ~0x03));		/* setup buffer source pitch including slopspace (in bytes).		 * Note:		 * source pitch granularity = 16 pixels on the RIVA128 - TNT (so pre-NV10) bes */		/* (program both buffers to prevent sync distortions) *///		BESW(NV04_0SRCPTCH, (ob->width * 2));//		BESW(NV04_1SRCPTCH, (ob->width * 2));		/* setup output window position */		BESW(NV04_DSTREF, ((vcoordv & 0xffff0000) | ((hcoordv & 0xffff0000) >> 16)));		/* setup output window size */		BESW(NV04_DSTSIZE, (			(((vcoordv & 0x0000ffff) - ((vcoordv & 0xffff0000) >> 16) + 1) << 16) |			((hcoordv & 0x0000ffff) - ((hcoordv & 0xffff0000) >> 16) + 1)			));		/* enable BES (b0), enable colorkeying (b4), format yuy2 (b8: 0 = ccir) *///		BESW(NV04_GENCTRL, 0x00000111);		/* select buffer 1 as active (b16) */		BESW(NV04_SU_STATE, 0x00010000);	}	else	{		/* >= NV10A */			/* setup buffer origin: GeForce uses subpixel precise clipping on left and top! (12.4 values) */		BESW(NV10_0SRCREF, ((v1srcstv << 4) & 0xffff0000) | ((hsrcstv >> 12) & 0x0000ffff));		/* setup buffersize */		//fixme if needed: width must be even officially...//		BESW(NV10_0SRCSIZE, ((ob->height << 16) | ob->width));		/* setup source pitch including slopspace (in bytes),		 * b16: select YUY2 (0 = YV12), b20: use colorkey, b24: no iturbt_709 (do iturbt_601) */		/* Note:		 * source pitch granularity = 32 pixels on GeForce cards!! *///		BESW(NV10_0SRCPTCH, (((ob->width * 2) & 0x0000ffff) | (1 << 16) | (1 << 20) | (0 << 24)));		/* setup output window position */		BESW(NV10_0DSTREF, ((vcoordv & 0xffff0000) | ((hcoordv & 0xffff0000) >> 16)));		/* setup output window size */		BESW(NV10_0DSTSIZE, (			(((vcoordv & 0x0000ffff) - ((vcoordv & 0xffff0000) >> 16) + 1) << 16) |			((hcoordv & 0x0000ffff) - ((hcoordv & 0xffff0000) >> 16) + 1)			));		/* setup (unclipped!) buffer startadress in RAM *///		BESW(NV10_0BUFADR, a1orgv);		/* enable BES (b0 = 0) *///		BESW(NV10_GENCTRL, 0x00000000);		/* We only use buffer buffer 0: select it. (0x01 = buffer 0, 0x10 = buffer 1) */		/* This also triggers activation of programmed values (double buffered registers feature) */		BESW(NV10_BUFSEL, 0x00000001);	}}