#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"
#include "xf86_OSproc.h"
#include "dgaproc.h"

#include "tdfx.h"
#include "vgaHW.h"

static Bool TDFX_OpenFramebuffer(ScrnInfoPtr, char **, unsigned char **, 
				 int *, int *, int *);
static Bool TDFX_SetMode(ScrnInfoPtr, DGAModePtr);
static int  TDFX_GetViewport(ScrnInfoPtr);
static void TDFX_SetViewport(ScrnInfoPtr, int, int, int);
#ifdef HAVE_XAA_H
static void TDFX_FillRect(ScrnInfoPtr, int, int, int, int, unsigned long);
static void TDFX_BlitRect(ScrnInfoPtr, int, int, int, int, int, int);
static void TDFX_BlitTransRect(ScrnInfoPtr, int, int, int, int, int, int, 
			       unsigned long);
#endif


static
DGAFunctionRec TDFX_DGAFuncs = {
  TDFX_OpenFramebuffer,
  0,
  TDFX_SetMode,
  TDFX_SetViewport,
  TDFX_GetViewport,
  TDFXSync,
#ifdef HAVE_XAA_H
  TDFX_FillRect,
  TDFX_BlitRect,
  TDFX_BlitTransRect
#else
  NULL, NULL, NULL
#endif
};


Bool
TDFXDGAInit(ScreenPtr pScreen)
{
  ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
  TDFXPtr pTDFX;
  DisplayModePtr pMode, firstMode;
  DGAModePtr modes=0, newmodes=0, currentMode;
  int num=0;

  pTDFX = TDFXPTR(pScrn);
  pMode = firstMode = pScrn->modes;

  while (pMode) {
    newmodes = realloc(modes, (num+1)*sizeof(DGAModeRec));

    if (!newmodes) {
      free(modes);
      return FALSE;
    }
    modes = newmodes;

    currentMode = modes+num;
    num++;
    currentMode->mode = pMode;
    currentMode->flags = DGA_CONCURRENT_ACCESS | DGA_PIXMAP_AVAILABLE;
#ifdef HAVE_XAA_H
    if (!pTDFX->NoAccel)
      currentMode->flags |= DGA_FILL_RECT | DGA_BLIT_RECT;
#endif
    if (pMode->Flags & V_DBLSCAN)
      currentMode->flags |= DGA_DOUBLESCAN;
    if (pMode->Flags & V_INTERLACE)
      currentMode->flags |= DGA_INTERLACED;
    currentMode->byteOrder = pScrn->imageByteOrder;
    currentMode->depth = pScrn->depth;
    currentMode->bitsPerPixel = pScrn->bitsPerPixel;
    currentMode->red_mask = pScrn->mask.red;
    currentMode->green_mask = pScrn->mask.green;
    currentMode->blue_mask = pScrn->mask.blue;
    currentMode->visualClass = pScrn->defaultVisual;
    currentMode->viewportWidth = pMode->HDisplay;
    currentMode->viewportHeight = pMode->VDisplay;
    currentMode->xViewportStep = 1;
    currentMode->yViewportStep = 1;
    currentMode->viewportFlags = DGA_FLIP_RETRACE;
    currentMode->offset = 0;
    currentMode->address = pTDFX->FbBase;
    currentMode->bytesPerScanline = ((pScrn->displayWidth*pTDFX->cpp)+3) & ~3L;
    currentMode->imageWidth = pScrn->displayWidth;
    currentMode->imageHeight =  pTDFX->pixmapCacheLinesMax;
    currentMode->pixmapWidth = currentMode->imageWidth;
    currentMode->pixmapHeight = currentMode->imageHeight;
    currentMode->maxViewportX = currentMode->imageWidth - 
                                currentMode->viewportWidth;
    /* this might need to get clamped to some maximum */
    currentMode->maxViewportY = currentMode->imageHeight -
                                currentMode->viewportHeight;
    
    pMode = pMode->next;
    if (pMode == firstMode) break;
  }
  
  pTDFX->DGAModes = modes;
  
  return DGAInit(pScreen, &TDFX_DGAFuncs, modes, num);  
}

static Bool
TDFX_SetMode(ScrnInfoPtr pScrn, DGAModePtr pMode)
{
   static DisplayModePtr OldModes[MAXSCREENS];
   int index = pScrn->pScreen->myNum;

   TDFXPtr pTDFX = TDFXPTR(pScrn);

   if (!pMode) { /* restore the original mode */
     /* put the ScreenParameters back */
     if(pTDFX->DGAactive) {
	TDFXSwitchMode(SWITCH_MODE_ARGS(pScrn, OldModes[index]));
	TDFXAdjustFrame(ADJUST_FRAME_ARGS(pScrn, 0, 0));
	pTDFX->DGAactive = FALSE;
     }
   } else {
     if (!pTDFX->DGAactive) {  /* save the old parameters */
        OldModes[index] = pScrn->currentMode;
        pTDFX->DGAactive = TRUE;
     }

     TDFXSwitchMode(SWITCH_MODE_ARGS(pScrn, pMode->mode));
   }
   
   return TRUE;
}

static int  
TDFX_GetViewport(ScrnInfoPtr pScrn)
{
    TDFXPtr pTDFX = TDFXPTR(pScrn);

    return pTDFX->DGAViewportStatus;
}

static void 
TDFX_SetViewport(ScrnInfoPtr pScrn, int x, int y, int flags)
{
   TDFXPtr pTDFX = TDFXPTR(pScrn);
   vgaHWPtr hwp = VGAHWPTR(pScrn);

   TDFXAdjustFrame(ADJUST_FRAME_ARGS(pScrn, x, y));

   /* fixme */
   while(hwp->readST01(hwp) & 0x08);
   while(!(hwp->readST01(hwp) & 0x08));

   pTDFX->DGAViewportStatus = 0;  
}

#ifdef HAVE_XAA_H
static void 
TDFX_FillRect(ScrnInfoPtr pScrn, int x, int y, int w, int h, 
	      unsigned long color)
{
  TDFXPtr pTDFX = TDFXPTR(pScrn);

  if (pTDFX->AccelInfoRec) {
    (*pTDFX->AccelInfoRec->SetupForSolidFill)(pScrn, color, GXcopy, ~0);
    (*pTDFX->AccelInfoRec->SubsequentSolidFillRect)(pScrn, x, y, w, h);
  }
}

static void 
TDFX_BlitRect(ScrnInfoPtr pScrn, int srcx, int srcy, int w, int h, 
	      int dstx, int dsty)
{
  TDFXPtr pTDFX = TDFXPTR(pScrn);

  if (pTDFX->AccelInfoRec) {
    int xdir = ((srcx < dstx) && (srcy == dsty)) ? -1 : 1;
    int ydir = (srcy < dsty) ? -1 : 1;

    (*pTDFX->AccelInfoRec->SetupForScreenToScreenCopy)(pScrn, xdir, ydir, GXcopy, ~0, -1);
    (*pTDFX->AccelInfoRec->SubsequentScreenToScreenCopy)(pScrn, srcx, srcy, dstx, dsty, w, h);
  }
}


static void 
TDFX_BlitTransRect(
   ScrnInfoPtr pScrn, 
   int srcx, int srcy, 
   int w, int h, 
   int dstx, int dsty,
   unsigned long color
){
  /* this one should be separate since the XAA function would
     prohibit usage of ~0 as the key */
}
#endif


static Bool 
TDFX_OpenFramebuffer(
   ScrnInfoPtr pScrn, 
   char **name,
   unsigned char **mem,
   int *size,
   int *offset,
   int *flags
){
    TDFXPtr pTDFX = TDFXPTR(pScrn);

    *name = NULL; 		/* no special device */
    *mem = (unsigned char*)pTDFX->LinearAddr[0] + pTDFX->fbOffset;
    *size = pTDFX->FbMapSize;
    *offset = /* pTDFX->fbOffset */ 0 ;  /* DGA is broken */
    *flags = DGA_NEED_ROOT;

    return TRUE;
}