/*
 * Copyright 2000-2001 VA Linux Systems, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Keith Whitwell <keith@tungstengraphics.com>
 */
/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgabuffers.c,v 1.13 2002/11/05 17:46:08 tsi Exp $ */

#include <stdio.h>
#include "mgacontext.h"
#include "mgabuffers.h"
#include "mgastate.h"
#include "mgaioctl.h"
#include "mgatris.h"

static void mgaXMesaSetFrontClipRects( mgaContextPtr mmesa )
{
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;

/*   fprintf( stderr, "%s\n", __FUNCTION__ );*/

   if (driDrawable->numClipRects == 0) {
       static XF86DRIClipRectRec zeroareacliprect = {0,0,0,0};
       mmesa->numClipRects = 1;
       mmesa->pClipRects = &zeroareacliprect;
   } else {
       mmesa->numClipRects = driDrawable->numClipRects;
       mmesa->pClipRects = driDrawable->pClipRects;
   }
   mmesa->drawX = driDrawable->x;
   mmesa->drawY = driDrawable->y;

   mmesa->setup.dstorg = mmesa->drawOffset;
   mmesa->dirty |= MGA_UPLOAD_CONTEXT | MGA_UPLOAD_CLIPRECTS;
}


static void mgaXMesaSetBackClipRects( mgaContextPtr mmesa )
{
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;

/*   fprintf( stderr, "%s\n", __FUNCTION__ );*/

   if (driDrawable->numBackClipRects == 0)
   {
      if (driDrawable->numClipRects == 0) {
	  static XF86DRIClipRectRec zeroareacliprect = {0,0,0,0};
	  mmesa->numClipRects = 1;
	  mmesa->pClipRects = &zeroareacliprect;
      } else {
	  mmesa->numClipRects = driDrawable->numClipRects;
	  mmesa->pClipRects = driDrawable->pClipRects;
      }
      mmesa->drawX = driDrawable->x;
      mmesa->drawY = driDrawable->y;
   } else {
      mmesa->numClipRects = driDrawable->numBackClipRects;
      mmesa->pClipRects = driDrawable->pBackClipRects;
      mmesa->drawX = driDrawable->backX;
      mmesa->drawY = driDrawable->backY;
   }

   mmesa->setup.dstorg = mmesa->drawOffset;
   mmesa->dirty |= MGA_UPLOAD_CONTEXT | MGA_UPLOAD_CLIPRECTS;
}



#if 0
static void mgaUpdateRectsFromSarea( mgaContextPtr mmesa )
{
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;
   __DRIscreenPrivate *driScreen = mmesa->driScreen;
   MGASAREAPrivPtr sarea = mmesa->sarea;
   int i = 0, top = 0;


   if (sarea->exported_buffers & MGA_BACK) {

      driDrawable->numBackClipRects = sarea->exported_nback;
      driDrawable->pBackClipRects = mmesa->tmp_boxes[0];

      top = sarea->exported_nback;
      for (i = 0 ; i < top ; i++)
	 driDrawable->pBackClipRects[i] =
	    *(XF86DRIClipRectPtr)&(sarea->exported_boxes[i]);
   }


   if (sarea->exported_buffers & MGA_FRONT)
   {
      int start = top;

      driDrawable->numClipRects = sarea->exported_nfront;
      driDrawable->pClipRects = mmesa->tmp_boxes[1];

      top += sarea->exported_nfront;
      for ( ; i < top ; i++)
	 driDrawable->pClipRects[i-start] =
	    *(XF86DRIClipRectPtr)&(sarea->exported_boxes[i]);

   }



   driDrawable->index = sarea->exported_index;
   driDrawable->lastStamp = sarea->exported_stamp;
   driDrawable->x = sarea->exported_front_x;
   driDrawable->y = sarea->exported_front_y;
   driDrawable->backX = sarea->exported_back_x;
   driDrawable->backY = sarea->exported_back_y;
   driDrawable->w = sarea->exported_w;
   driDrawable->h = sarea->exported_h;
   driDrawable->pStamp =
      &(driScreen->pSAREA->drawableTable[driDrawable->index].stamp);

   mmesa->dirty_cliprects = (MGA_FRONT|MGA_BACK) & ~(sarea->exported_buffers);
}
#endif

#if 0
static void printSareaRects( mgaContextPtr mmesa )
{
   __DRIscreenPrivate *driScreen = mmesa->driScreen;
   MGASAREAPrivPtr sarea = mmesa->sarea;
   int i;

   fprintf(stderr, "sarea->exported: %d\n", sarea->exported_drawable);
   fprintf(stderr, "sarea->exported_index: %d\n", sarea->exported_index);
   fprintf(stderr, "sarea->exported_stamp: %d\n", sarea->exported_stamp);
   fprintf(stderr, "sarea->exported_front_x: %d\n", sarea->exported_front_x);
   fprintf(stderr, "sarea->exported_front_y: %d\n", sarea->exported_front_y);
   fprintf(stderr, "sarea->exported_back_x: %d\n", sarea->exported_back_x);
   fprintf(stderr, "sarea->exported_back_y: %d\n", sarea->exported_back_y);
   fprintf(stderr, "sarea->exported_w: %d\n", sarea->exported_w);
   fprintf(stderr, "sarea->exported_h: %d\n", sarea->exported_h);
   fprintf(stderr, "sarea->exported_buffers: %d\n", sarea->exported_buffers);
   fprintf(stderr, "sarea->exported_nfront: %d\n", sarea->exported_nfront);
   fprintf(stderr, "sarea->exported_nback: %d\n", sarea->exported_nback);

   i = 0;
   if (sarea->exported_buffers & MGA_BACK)
      for ( ; i < sarea->exported_nback ; i++)
	 fprintf(stderr, "back %d: %d,%d-%d,%d\n", i,
		 sarea->exported_boxes[i].x1, sarea->exported_boxes[i].y1,
		 sarea->exported_boxes[i].x2, sarea->exported_boxes[i].y2);

   if (sarea->exported_buffers & MGA_FRONT) {
      int start = i;
      int top = i + sarea->exported_nfront;
      for ( ; i < top ; i++)
	 fprintf(stderr, "front %d: %d,%d-%d,%d\n",
		 i - start,
		 sarea->exported_boxes[i].x1, sarea->exported_boxes[i].y1,
		 sarea->exported_boxes[i].x2, sarea->exported_boxes[i].y2);
   }

   fprintf(stderr, "drawableTable[%d].stamp: %d\n",
	   sarea->exported_index,
	   driScreen->pSAREA->drawableTable[sarea->exported_index].stamp);
}

static void printMmesaRects( mgaContextPtr mmesa )
{
   __DRIscreenPrivate *driScreen = mmesa->driScreen;
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;
   int nr = mmesa->numClipRects;
   int i;

   fprintf(stderr, "driDrawable->draw: %ld\n", driDrawable->draw);
   fprintf(stderr, "driDrawable->index: %d\n", driDrawable->index);
   fprintf(stderr, "driDrawable->lastStamp: %d\n", driDrawable->lastStamp);
   fprintf(stderr, "mmesa->drawX: %d\n", mmesa->drawX);
   fprintf(stderr, "mmesa->drawY: %d\n", mmesa->drawY);
   fprintf(stderr, "driDrawable->w: %d\n", driDrawable->w);
   fprintf(stderr, "driDrawable->h: %d\n", driDrawable->h);

   for (i = 0 ; i < nr ; i++)
      fprintf(stderr, "box %d: %d,%d-%d,%d\n", i,
	      mmesa->pClipRects[i].x1, mmesa->pClipRects[i].y1,
	      mmesa->pClipRects[i].x2, mmesa->pClipRects[i].y2);

   fprintf(stderr, "mmesa->draw_buffer: %d\n", mmesa->draw_buffer);
   fprintf(stderr, "drawableTable[%d].stamp: %d\n",
	   driDrawable->index,
	   driScreen->pSAREA->drawableTable[driDrawable->index].stamp);
}
#endif



void mgaUpdateRects( mgaContextPtr mmesa, GLuint buffers )
{
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;
   MGASAREAPrivPtr sarea = mmesa->sarea;

/*   fprintf(stderr, "%s\n", __FUNCTION__);*/

   DRI_VALIDATE_DRAWABLE_INFO(driScreen, driDrawable); 
   mmesa->dirty_cliprects = 0;	

   if (mmesa->draw_buffer == MGA_FRONT)
      mgaXMesaSetFrontClipRects( mmesa );
   else
      mgaXMesaSetBackClipRects( mmesa );

#if 0
   printMmesaRects(mmesa); 
#endif

   sarea->req_draw_buffer = mmesa->draw_buffer;

   mgaUpdateClipping( mmesa->glCtx );
   mgaCalcViewport( mmesa->glCtx );

   mmesa->dirty |= MGA_UPLOAD_CLIPRECTS;
}


void mgaDDSetReadBuffer(GLcontext *ctx, GLenum mode )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   if (mode == GL_FRONT_LEFT) 
   {
      mmesa->readOffset = mmesa->mgaScreen->frontOffset;
      mmesa->read_buffer = MGA_FRONT;
   } 
   else 
   {
      mmesa->readOffset = mmesa->mgaScreen->backOffset;
      mmesa->read_buffer = MGA_BACK;
   }
}

void mgaDDSetDrawBuffer(GLcontext *ctx, GLenum mode )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   FLUSH_BATCH( MGA_CONTEXT(ctx) );

/*   fprintf( stderr, "%s %d\n", __FUNCTION__, mode);*/

   /*
    * _DrawDestMask is easier to cope with than <mode>.
    */
   switch ( ctx->Color._DrawDestMask ) {
     case FRONT_LEFT_BIT:
       mmesa->drawOffset = mmesa->mgaScreen->frontOffset;
       mmesa->readOffset = mmesa->mgaScreen->frontOffset;
       mmesa->setup.dstorg = mmesa->mgaScreen->frontOffset;
       mmesa->dirty |= MGA_UPLOAD_CONTEXT;
       mmesa->draw_buffer = MGA_FRONT;
       mgaXMesaSetFrontClipRects( mmesa );
       FALLBACK( ctx, MGA_FALLBACK_DRAW_BUFFER, GL_FALSE );
       break;
     case BACK_LEFT_BIT:
       mmesa->drawOffset = mmesa->mgaScreen->backOffset;
       mmesa->readOffset = mmesa->mgaScreen->backOffset;
       mmesa->setup.dstorg = mmesa->mgaScreen->backOffset;
       mmesa->draw_buffer = MGA_BACK;
       mmesa->dirty |= MGA_UPLOAD_CONTEXT;
       mgaXMesaSetBackClipRects( mmesa );
       FALLBACK( ctx, MGA_FALLBACK_DRAW_BUFFER, GL_FALSE );
       break;
     default:
       FALLBACK( ctx, MGA_FALLBACK_DRAW_BUFFER, GL_TRUE );
       break;
   }
}