Initial revision

1 files changed, 573 insertions, 0 deletions

diff --git a/src/nv_xaa.c b/src/nv_xaa.c
new file mode 100644
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--- /dev/null
+++ b/src/nv_xaa.c
@@ -0,0 +1,573 @@
+/* $XConsortium: nv_driver.c /main/3 1996/10/28 05:13:37 kaleb $ */
+ /***************************************************************************\
+|*                                                                           *|
+|*       Copyright 1993-1999 NVIDIA, Corporation.  All rights reserved.      *|
+|*                                                                           *|
+|*     NOTICE TO USER:   The source code  is copyrighted under  U.S. and     *|
+|*     international laws.  Users and possessors of this source code are     *|
+|*     hereby granted a nonexclusive,  royalty-free copyright license to     *|
+|*     use this code in individual and commercial software.                  *|
+|*                                                                           *|
+|*     Any use of this source code must include,  in the user documenta-     *|
+|*     tion and  internal comments to the code,  notices to the end user     *|
+|*     as follows:                                                           *|
+|*                                                                           *|
+|*       Copyright 1993-1999 NVIDIA, Corporation.  All rights reserved.      *|
+|*                                                                           *|
+|*     NVIDIA, CORPORATION MAKES NO REPRESENTATION ABOUT THE SUITABILITY     *|
+|*     OF  THIS SOURCE  CODE  FOR ANY PURPOSE.  IT IS  PROVIDED  "AS IS"     *|
+|*     WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND.  NVIDIA, CORPOR-     *|
+|*     ATION DISCLAIMS ALL WARRANTIES  WITH REGARD  TO THIS SOURCE CODE,     *|
+|*     INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGE-     *|
+|*     MENT,  AND FITNESS  FOR A PARTICULAR PURPOSE.   IN NO EVENT SHALL     *|
+|*     NVIDIA, CORPORATION  BE LIABLE FOR ANY SPECIAL,  INDIRECT,  INCI-     *|
+|*     DENTAL, OR CONSEQUENTIAL DAMAGES,  OR ANY DAMAGES  WHATSOEVER RE-     *|
+|*     SULTING FROM LOSS OF USE,  DATA OR PROFITS,  WHETHER IN AN ACTION     *|
+|*     OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,  ARISING OUT OF     *|
+|*     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOURCE CODE.     *|
+|*                                                                           *|
+|*     U.S. Government  End  Users.   This source code  is a "commercial     *|
+|*     item,"  as that  term is  defined at  48 C.F.R. 2.101 (OCT 1995),     *|
+|*     consisting  of "commercial  computer  software"  and  "commercial     *|
+|*     computer  software  documentation,"  as such  terms  are  used in     *|
+|*     48 C.F.R. 12.212 (SEPT 1995)  and is provided to the U.S. Govern-     *|
+|*     ment only as  a commercial end item.   Consistent with  48 C.F.R.     *|
+|*     12.212 and  48 C.F.R. 227.7202-1 through  227.7202-4 (JUNE 1995),     *|
+|*     all U.S. Government End Users  acquire the source code  with only     *|
+|*     those rights set forth herein.                                        *|
+|*                                                                           *|
+ \***************************************************************************/
+
+/* Hacked together from mga driver and 3.3.4 NVIDIA driver by
+   Jarno Paananen <jpaana@s2.org> */
+
+/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/nv/nv_xaa.c,v 1.29 2003/02/12 21:26:27 mvojkovi Exp $ */
+
+#include "nv_include.h"
+#include "xaalocal.h"
+#include "xaarop.h"
+
+#include "miline.h"
+
+static void
+NVSetClippingRectangle(ScrnInfoPtr pScrn, int x1, int y1, int x2, int y2)
+{
+    int height = y2-y1 + 1;
+    int width  = x2-x1 + 1;
+    NVPtr pNv = NVPTR(pScrn);
+
+    RIVA_FIFO_FREE(pNv->riva, Clip, 2);
+    pNv->riva.Clip->TopLeft     = (y1     << 16) | (x1 & 0xffff);
+    pNv->riva.Clip->WidthHeight = (height << 16) | width;
+}
+
+
+static void
+NVDisableClipping(ScrnInfoPtr pScrn)
+{
+    NVSetClippingRectangle(pScrn, 0, 0, 0x7fff, 0x7fff);
+}
+
+/*
+ * Set pattern. Internal routine. The upper bits of the colors
+ * are the ALPHA bits.  0 == transparency.
+ */
+static void
+NVSetPattern(NVPtr pNv, int clr0, int clr1, int pat0, int pat1)
+{
+    RIVA_FIFO_FREE(pNv->riva, Patt, 5);
+    pNv->riva.Patt->Shape         = 0; /* 0 = 8X8, 1 = 64X1, 2 = 1X64 */
+    pNv->riva.Patt->Color0        = clr0;
+    pNv->riva.Patt->Color1        = clr1;
+    pNv->riva.Patt->Monochrome[0] = pat0;
+    pNv->riva.Patt->Monochrome[1] = pat1;
+}
+
+/*
+ * Set ROP.  Translate X rop into ROP3.  Internal routine.
+ */
+static void
+NVSetRopSolid(NVPtr pNv, int rop)
+{    
+    if (pNv->currentRop != rop)
+    {
+        if (pNv->currentRop > 16)
+            NVSetPattern(pNv, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
+        pNv->currentRop = rop;
+        RIVA_FIFO_FREE(pNv->riva, Rop, 1);
+        pNv->riva.Rop->Rop3 = XAACopyROP[rop];
+    }
+}
+
+static void
+NVSetRopPattern(NVPtr pNv, int rop)
+{
+    if (pNv->currentRop != rop + 16)
+    {
+        pNv->currentRop = rop + 16; /* +16 is important */
+        RIVA_FIFO_FREE(pNv->riva, Rop, 1);
+        pNv->riva.Rop->Rop3 = XAAPatternROP[rop];
+    }
+}
+
+/*
+ * Fill solid rectangles.
+ */
+static
+void NVSetupForSolidFill(ScrnInfoPtr pScrn, int color, int rop,
+                         unsigned planemask)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    NVSetRopSolid(pNv, rop);
+    RIVA_FIFO_FREE(pNv->riva, Bitmap, 1);
+    pNv->riva.Bitmap->Color1A = color;
+}
+
+static void
+NVSubsequentSolidFillRect(ScrnInfoPtr pScrn, int x, int y, int w, int h)
+{
+    NVPtr pNv = NVPTR(pScrn);
+    
+    RIVA_FIFO_FREE(pNv->riva, Bitmap, 2);
+    pNv->riva.Bitmap->UnclippedRectangle[0].TopLeft     = (x << 16) | y; 
+    write_mem_barrier();
+    pNv->riva.Bitmap->UnclippedRectangle[0].WidthHeight = (w << 16) | h;
+    write_mem_barrier();
+}
+
+/*
+ * Screen to screen BLTs.
+ */
+static void
+NVSetupForScreenToScreenCopy(ScrnInfoPtr pScrn, int xdir, int ydir, int rop,
+                             unsigned planemask, int transparency_color)
+{
+    NVSetRopSolid(NVPTR(pScrn), rop);
+}
+
+static void
+NVSubsequentScreenToScreenCopy(ScrnInfoPtr pScrn, int x1, int y1,
+                               int x2, int y2, int w, int h)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    RIVA_FIFO_FREE(pNv->riva, Blt, 3);
+    pNv->riva.Blt->TopLeftSrc  = (y1 << 16) | x1;
+    pNv->riva.Blt->TopLeftDst  = (y2 << 16) | x2;
+    write_mem_barrier();
+    pNv->riva.Blt->WidthHeight = (h  << 16) | w;
+    write_mem_barrier();
+}
+
+
+/*
+ * Fill 8x8 monochrome pattern rectangles.  patternx and patterny are
+ * the overloaded pattern bits themselves. The pattern colors don't
+ * support 565, only 555. Hack around it.
+ */
+static void
+NVSetupForMono8x8PatternFill(ScrnInfoPtr pScrn, int patternx, int patterny,
+                             int fg, int bg, int rop, unsigned planemask)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    NVSetRopPattern(pNv, rop);
+    if (pScrn->depth == 16)
+    {
+        fg = ((fg & 0x0000F800) << 8)
+           | ((fg & 0x000007E0) << 5)
+           | ((fg & 0x0000001F) << 3)
+           |        0xFF000000;
+        if (bg != -1)
+            bg = ((bg & 0x0000F800) << 8)
+               | ((bg & 0x000007E0) << 5)
+               | ((bg & 0x0000001F) << 3)
+               |        0xFF000000;
+        else
+            bg = 0;
+    }
+    else
+    {
+	fg |= pNv->opaqueMonochrome;
+	bg  = (bg == -1) ? 0 : bg | pNv->opaqueMonochrome;
+    };
+    NVSetPattern(pNv, bg, fg, patternx, patterny);
+    RIVA_FIFO_FREE(pNv->riva, Bitmap, 1);
+    pNv->riva.Bitmap->Color1A = fg;
+}
+
+static void
+NVSubsequentMono8x8PatternFillRect(ScrnInfoPtr pScrn,
+                                   int patternx, int patterny,
+                                   int x, int y, int w, int h)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    RIVA_FIFO_FREE(pNv->riva, Bitmap, 2);
+    pNv->riva.Bitmap->UnclippedRectangle[0].TopLeft     = (x << 16) | y;
+    write_mem_barrier();
+    pNv->riva.Bitmap->UnclippedRectangle[0].WidthHeight = (w << 16) | h;
+    write_mem_barrier();
+}
+
+
+void
+NVResetGraphics(ScrnInfoPtr pScrn)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    if(pNv->NoAccel) return;
+
+    pNv->currentRop = -1;
+    NVSetRopPattern(pNv, GXcopy); 
+}
+
+
+
+/*
+ * Synchronise with graphics engine.  Make sure it is idle before returning.
+ * Should attempt to yield CPU if busy for awhile.
+ */
+void NVSync(ScrnInfoPtr pScrn)
+{
+    NVPtr pNv = NVPTR(pScrn);
+    RIVA_BUSY(pNv->riva);
+}
+
+/* Color expansion */
+static void
+NVSetupForScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn,
+                                             int fg, int bg, int rop, 
+                                             unsigned int planemask)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    NVSetRopSolid(pNv, rop);
+
+    if ( bg == -1 )
+    {
+        /* Transparent case */
+        bg = 0x80000000;
+        pNv->expandFifo = (unsigned char*)&pNv->riva.Bitmap->MonochromeData1C;
+    }
+    else
+    {
+        pNv->expandFifo = (unsigned char*)&pNv->riva.Bitmap->MonochromeData01E;
+        if (pScrn->depth == 16)
+        {
+            bg = ((bg & 0x0000F800) << 8)
+               | ((bg & 0x000007E0) << 5)
+               | ((bg & 0x0000001F) << 3)
+               |        0xFF000000;
+        }
+        else
+        {
+            bg  |= pNv->opaqueMonochrome;
+        };
+    }
+    pNv->FgColor = fg;
+    pNv->BgColor = bg;
+}
+
+static void
+NVSubsequentColorExpandScanline(ScrnInfoPtr pScrn, int bufno)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    int t = pNv->expandWidth;
+    CARD32 *pbits = (CARD32*)pNv->expandBuffer;
+    CARD32 *d = (CARD32*)pNv->expandFifo;
+    
+    while(t >= 16) 
+    {
+	RIVA_FIFO_FREE(pNv->riva, Bitmap, 16);
+	d[0]  = pbits[0];
+	d[1]  = pbits[1];
+	d[2]  = pbits[2];
+	d[3]  = pbits[3];
+	d[4]  = pbits[4];
+	d[5]  = pbits[5];
+	d[6]  = pbits[6];
+	d[7]  = pbits[7];
+	d[8]  = pbits[8];
+	d[9]  = pbits[9];
+	d[10] = pbits[10];
+	d[11] = pbits[11];
+	d[12] = pbits[12];
+	d[13] = pbits[13];
+	d[14] = pbits[14];
+	d[15] = pbits[15];
+	t -= 16; pbits += 16;
+    }
+    if(t) {
+	RIVA_FIFO_FREE(pNv->riva, Bitmap, t);
+	while(t >= 4) 
+	{
+	    d[0]  = pbits[0];
+	    d[1]  = pbits[1];
+	    d[2]  = pbits[2];
+	    d[3]  = pbits[3];
+	    t -= 4; pbits += 4;
+	}
+	while(t--) 
+	    *(d++) = *(pbits++); 
+    }
+
+    if (!(--pNv->expandRows)) { /* hardware bug workaround */
+       RIVA_FIFO_FREE(pNv->riva, Blt, 1);
+       write_mem_barrier();
+       pNv->riva.Blt->TopLeftSrc = 0;
+    }
+    write_mem_barrier();
+}
+
+static void
+NVSubsequentColorExpandScanlineFifo(ScrnInfoPtr pScrn, int bufno)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    if ( --pNv->expandRows ) {
+       RIVA_FIFO_FREE(pNv->riva, Bitmap, pNv->expandWidth);
+    } else { /* hardware bug workaround */
+       RIVA_FIFO_FREE(pNv->riva, Blt, 1);
+       write_mem_barrier();
+       pNv->riva.Blt->TopLeftSrc = 0;
+    }
+    write_mem_barrier();
+}
+
+static void
+NVSubsequentScanlineCPUToScreenColorExpandFill(ScrnInfoPtr pScrn, int x,
+                                               int y, int w, int h,
+                                               int skipleft)
+{
+    int bw;
+    NVPtr pNv = NVPTR(pScrn);
+    
+    bw = (w + 31) & ~31;
+    pNv->expandWidth = bw >> 5;
+
+    if ( pNv->BgColor == 0x80000000 )
+    {
+        /* Use faster transparent method */
+        RIVA_FIFO_FREE(pNv->riva, Bitmap, 5);
+        pNv->riva.Bitmap->ClipC.TopLeft     = (y << 16) | ((x+skipleft)
+                                                           & 0xFFFF);
+        pNv->riva.Bitmap->ClipC.BottomRight = ((y+h) << 16) | ((x+w)&0xffff);
+        pNv->riva.Bitmap->Color1C           = pNv->FgColor;
+        pNv->riva.Bitmap->WidthHeightC      = (h << 16) | bw;
+        write_mem_barrier();
+        pNv->riva.Bitmap->PointC            = (y << 16) | (x & 0xFFFF);
+        write_mem_barrier();
+    }
+    else
+    {
+        /* Opaque */
+        RIVA_FIFO_FREE(pNv->riva, Bitmap, 7);
+        pNv->riva.Bitmap->ClipE.TopLeft     = (y << 16) | ((x+skipleft)
+                                                           & 0xFFFF);
+        pNv->riva.Bitmap->ClipE.BottomRight = ((y+h) << 16) | ((x+w)&0xffff);
+        pNv->riva.Bitmap->Color0E           = pNv->BgColor;
+        pNv->riva.Bitmap->Color1E           = pNv->FgColor;
+        pNv->riva.Bitmap->WidthHeightInE  = (h << 16) | bw;
+        pNv->riva.Bitmap->WidthHeightOutE = (h << 16) | bw;
+        write_mem_barrier();
+        pNv->riva.Bitmap->PointE          = (y << 16) | (x & 0xFFFF);
+        write_mem_barrier();
+    }
+
+    pNv->expandRows = h;
+
+    if(pNv->expandWidth > (pNv->riva.FifoEmptyCount >> 2)) {
+	pNv->AccelInfoRec->ScanlineColorExpandBuffers = &pNv->expandBuffer;
+	pNv->AccelInfoRec->SubsequentColorExpandScanline = 
+				NVSubsequentColorExpandScanline;
+    } else {
+	pNv->AccelInfoRec->ScanlineColorExpandBuffers = &pNv->expandFifo;
+	pNv->AccelInfoRec->SubsequentColorExpandScanline = 
+				NVSubsequentColorExpandScanlineFifo;
+	RIVA_FIFO_FREE(pNv->riva, Bitmap, pNv->expandWidth);
+    }
+}
+
+static void
+NVSetupForSolidLine(ScrnInfoPtr pScrn, int color, int rop, unsigned planemask)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    NVSetRopSolid(pNv, rop);
+    pNv->FgColor = color;
+}
+
+static void 
+NVSubsequentSolidHorVertLine(ScrnInfoPtr pScrn, int x, int y, int len, int dir)
+{
+    NVPtr pNv = NVPTR(pScrn);
+
+    RIVA_FIFO_FREE(pNv->riva, Line, 3);
+    pNv->riva.Line->Color = pNv->FgColor;
+    pNv->riva.Line->Lin[0].point0 = ((y << 16) | ( x & 0xffff));
+    write_mem_barrier();
+    if ( dir ==DEGREES_0 )
+        pNv->riva.Line->Lin[0].point1 = ((y << 16) | (( x + len ) & 0xffff));
+    else
+        pNv->riva.Line->Lin[0].point1 = (((y + len) << 16) | ( x & 0xffff));
+    write_mem_barrier();
+}
+
+static void 
+NVSubsequentSolidTwoPointLine(ScrnInfoPtr pScrn, int x1, int y1,
+                              int x2, int y2, int flags)
+{
+    NVPtr pNv = NVPTR(pScrn);
+    Bool  lastPoint = !(flags & OMIT_LAST);
+
+    RIVA_FIFO_FREE(pNv->riva, Line, lastPoint ? 5 : 3);
+    pNv->riva.Line->Color = pNv->FgColor;
+    pNv->riva.Line->Lin[0].point0 = ((y1 << 16) | (x1 & 0xffff));
+    write_mem_barrier();
+    pNv->riva.Line->Lin[0].point1 = ((y2 << 16) | (x2 & 0xffff));
+    write_mem_barrier();
+    if (lastPoint)
+    {
+        pNv->riva.Line->Lin[1].point0 = ((y2 << 16) | (x2 & 0xffff));
+        write_mem_barrier();
+        pNv->riva.Line->Lin[1].point1 = (((y2 + 1) << 16) | (x2 & 0xffff));
+        write_mem_barrier();
+    }
+}
+
+static void
+NVValidatePolyArc(
+   GCPtr        pGC,
+   unsigned long changes,
+   DrawablePtr pDraw
+){
+   if(pGC->planemask != ~0) return;
+
+   if(!pGC->lineWidth && 
+	((pGC->alu != GXcopy) || (pGC->lineStyle != LineSolid)))
+   {
+        pGC->ops->PolyArc = miZeroPolyArc;
+   }
+}
+
+static void
+NVValidatePolyPoint(
+   GCPtr        pGC,
+   unsigned long changes,
+   DrawablePtr pDraw
+){
+   pGC->ops->PolyPoint = XAAFallbackOps.PolyPoint;
+
+   if(pGC->planemask != ~0) return;
+
+   if(pGC->alu != GXcopy)
+        pGC->ops->PolyPoint = miPolyPoint;
+}
+
+/* Initialize XAA acceleration info */
+Bool
+NVAccelInit(ScreenPtr pScreen) 
+{
+    XAAInfoRecPtr infoPtr;
+    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
+    NVPtr pNv = NVPTR(pScrn);
+    Bool lowClocks;
+
+    /* The hardware POSTs with clocks too low to support some acceleration
+       on NV20 and higher and we don't know enough about timing particulars
+       to raise them */
+
+    lowClocks = ((pNv->Chipset & 0x0ff0) >= 0x0200);
+    
+    pNv->AccelInfoRec = infoPtr = XAACreateInfoRec();
+    if(!infoPtr) return FALSE;
+
+    /* fill out infoPtr here */
+    infoPtr->Flags = LINEAR_FRAMEBUFFER | PIXMAP_CACHE | OFFSCREEN_PIXMAPS;
+
+    /* sync */
+    infoPtr->Sync = NVSync;
+
+    /* solid fills */
+    infoPtr->SolidFillFlags = NO_PLANEMASK;
+    infoPtr->SetupForSolidFill = NVSetupForSolidFill;
+    infoPtr->SubsequentSolidFillRect = NVSubsequentSolidFillRect;
+
+    if(lowClocks)
+       infoPtr->SolidFillFlags |= GXCOPY_ONLY;
+
+    /* screen to screen copy */
+    infoPtr->ScreenToScreenCopyFlags = NO_TRANSPARENCY | NO_PLANEMASK;
+    infoPtr->SetupForScreenToScreenCopy = NVSetupForScreenToScreenCopy;
+    infoPtr->SubsequentScreenToScreenCopy = NVSubsequentScreenToScreenCopy;
+
+    /* 8x8 mono patterns */
+    /*
+     * Set pattern opaque bits based on pixel format.
+     */
+    pNv->opaqueMonochrome = ~((1 << pScrn->depth) - 1);
+
+    pNv->currentRop = -1;
+
+    infoPtr->Mono8x8PatternFillFlags = HARDWARE_PATTERN_SCREEN_ORIGIN |
+				       HARDWARE_PATTERN_PROGRAMMED_BITS |
+				       NO_PLANEMASK;
+    infoPtr->SetupForMono8x8PatternFill = NVSetupForMono8x8PatternFill;
+    infoPtr->SubsequentMono8x8PatternFillRect =
+        NVSubsequentMono8x8PatternFillRect;
+
+    /* Color expansion */
+    infoPtr->ScanlineCPUToScreenColorExpandFillFlags =
+#if X_BYTE_ORDER == X_BIG_ENDIAN
+				BIT_ORDER_IN_BYTE_MSBFIRST | 
+#else
+				BIT_ORDER_IN_BYTE_LSBFIRST | 
+#endif
+				NO_PLANEMASK | 
+				CPU_TRANSFER_PAD_DWORD |
+				LEFT_EDGE_CLIPPING | 		
+				LEFT_EDGE_CLIPPING_NEGATIVE_X;
+
+    infoPtr->NumScanlineColorExpandBuffers = 1;
+
+    if(!lowClocks) {
+       infoPtr->SetupForScanlineCPUToScreenColorExpandFill =
+           NVSetupForScanlineCPUToScreenColorExpandFill;
+       infoPtr->SubsequentScanlineCPUToScreenColorExpandFill = 
+           NVSubsequentScanlineCPUToScreenColorExpandFill;
+    }
+
+    pNv->expandFifo = (unsigned char*)&pNv->riva.Bitmap->MonochromeData01E;
+    
+    /* Allocate buffer for color expansion and also image writes in the
+       future */
+    pNv->expandBuffer = xnfalloc(((pScrn->virtualX*pScrn->bitsPerPixel)/8) + 8);
+
+
+    infoPtr->ScanlineColorExpandBuffers = &pNv->expandBuffer;
+    infoPtr->SubsequentColorExpandScanline = NVSubsequentColorExpandScanline;
+
+    infoPtr->SolidLineFlags = infoPtr->SolidFillFlags;
+    infoPtr->SetupForSolidLine = NVSetupForSolidLine;
+    infoPtr->SubsequentSolidHorVertLine =
+		NVSubsequentSolidHorVertLine;
+    infoPtr->SubsequentSolidTwoPointLine = 
+		NVSubsequentSolidTwoPointLine;
+    infoPtr->SetClippingRectangle = NVSetClippingRectangle;
+    infoPtr->DisableClipping = NVDisableClipping;
+    infoPtr->ClippingFlags = HARDWARE_CLIP_SOLID_LINE;
+    miSetZeroLineBias(pScreen, OCTANT1 | OCTANT3 | OCTANT4 | OCTANT6);
+
+    infoPtr->ValidatePolyArc = NVValidatePolyArc;
+    infoPtr->PolyArcMask = GCFunction | GCLineWidth | GCPlaneMask;
+    infoPtr->ValidatePolyPoint = NVValidatePolyPoint;
+    infoPtr->PolyPointMask = GCFunction | GCPlaneMask;
+   
+    NVDisableClipping(pScrn);
+
+    return(XAAInit(pScreen, infoPtr));
+}
+