/*
 * Copyright �2006 Intel Corporation
 *
 * 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
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Eric Anholt <[email protected]>
 *
 */

#ifdef HAVE_CONFIG_H
#include <xorg-config.h>
#endif

#include <string.h>

#include "exa_priv.h"

#include "xf86str.h"
#include "xf86.h"

typedef struct _ExaXorgScreenPrivRec {
    CloseScreenProcPtr 		 SavedCloseScreen;
    EnableDisableFBAccessProcPtr SavedEnableDisableFBAccess;
    OptionInfoPtr		 options;
} ExaXorgScreenPrivRec, *ExaXorgScreenPrivPtr;

static int exaXorgServerGeneration;
static int exaXorgScreenPrivateIndex;

typedef enum {
    EXAOPT_MIGRATION_HEURISTIC,
    EXAOPT_NO_COMPOSITE,
    EXAOPT_NO_UTS,
    EXAOPT_NO_DFS,
} EXAOpts;

static const OptionInfoRec EXAOptions[] = {
    { EXAOPT_MIGRATION_HEURISTIC,	"MigrationHeuristic",
				OPTV_ANYSTR,	{0}, FALSE },
    { EXAOPT_NO_COMPOSITE,		"EXANoComposite",
				OPTV_BOOLEAN,	{0}, FALSE },
    { EXAOPT_NO_UTS,			"EXANoUploadToScreen",
				OPTV_BOOLEAN,	{0}, FALSE },
    { EXAOPT_NO_DFS,			"EXANoDownloadFromScreen",
				OPTV_BOOLEAN,	{0}, FALSE },
    { -1,				NULL,
				OPTV_NONE,	{0}, FALSE }
};

static Bool
exaXorgCloseScreen (int i, ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = XF86SCRNINFO(pScreen);
    ExaXorgScreenPrivPtr pScreenPriv =
	pScreen->devPrivates[exaXorgScreenPrivateIndex].ptr;

    pScreen->CloseScreen = pScreenPriv->SavedCloseScreen;

    pScrn->EnableDisableFBAccess = pScreenPriv->SavedEnableDisableFBAccess;

    xfree (pScreenPriv->options);
    xfree (pScreenPriv);

    return pScreen->CloseScreen (i, pScreen);
}

static void
exaXorgEnableDisableFBAccess (int index, Bool enable)
{
    ScreenPtr pScreen = screenInfo.screens[index];
    ExaXorgScreenPrivPtr pScreenPriv =
	pScreen->devPrivates[exaXorgScreenPrivateIndex].ptr;

    if (!enable)
	exaEnableDisableFBAccess (index, enable);

    if (pScreenPriv->SavedEnableDisableFBAccess)
       pScreenPriv->SavedEnableDisableFBAccess (index, enable);

    if (enable)
	exaEnableDisableFBAccess (index, enable);
}

/**
 * This will be called during exaDriverInit, giving us the chance to set options
 * and hook in our EnableDisableFBAccess.
 */
void
exaDDXDriverInit(ScreenPtr pScreen)
{
    ExaScreenPriv(pScreen);
    /* Do NOT use XF86SCRNINFO macro here!! */
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    ExaXorgScreenPrivPtr pScreenPriv;

    if (exaXorgServerGeneration != serverGeneration) {
	exaXorgScreenPrivateIndex = AllocateScreenPrivateIndex();
	exaXorgServerGeneration = serverGeneration;
    }

    pScreenPriv = xcalloc (1, sizeof(ExaXorgScreenPrivRec));
    if (pScreenPriv == NULL)
	return;

    pScreenPriv->options = xnfalloc (sizeof(EXAOptions));
    memcpy(pScreenPriv->options, EXAOptions, sizeof(EXAOptions));
    xf86ProcessOptions (pScrn->scrnIndex, pScrn->options, pScreenPriv->options);

    if ((pExaScr->info->flags & EXA_OFFSCREEN_PIXMAPS) &&
  	pExaScr->info->offScreenBase < pExaScr->info->memorySize)
    {
	char *heuristicName;

	heuristicName = xf86GetOptValString (pScreenPriv->options,
					     EXAOPT_MIGRATION_HEURISTIC);
	if (heuristicName != NULL) {
	    if (strcmp(heuristicName, "greedy") == 0)
		pExaScr->migration = ExaMigrationGreedy;
	    else if (strcmp(heuristicName, "always") == 0)
		pExaScr->migration = ExaMigrationAlways;
	    else if (strcmp(heuristicName, "smart") == 0)
		pExaScr->migration = ExaMigrationSmart;
	    else {
		xf86DrvMsg (pScreen->myNum, X_WARNING, 
			    "EXA: unknown migration heuristic %s\n",
			    heuristicName);
	    }
	}
    }

    if (xf86IsOptionSet(pScreenPriv->options, EXAOPT_NO_COMPOSITE)) {
	xf86DrvMsg(pScreen->myNum, X_INFO,
		   "EXA: Disabling Composite operation "
		   "(RENDER acceleration)\n");
	pExaScr->info->CheckComposite = NULL;
	pExaScr->info->PrepareComposite = NULL;
    }

    if (xf86IsOptionSet(pScreenPriv->options, EXAOPT_NO_UTS)) {
	xf86DrvMsg(pScreen->myNum, X_INFO,
		   "EXA: Disabling UploadToScreen\n");
	pExaScr->info->UploadToScreen = NULL;
    }

    if (xf86IsOptionSet(pScreenPriv->options, EXAOPT_NO_DFS)) {
	xf86DrvMsg(pScreen->myNum, X_INFO,
		   "EXA: Disabling DownloadFromScreen\n");
	pExaScr->info->DownloadFromScreen = NULL;
    }

    pScreen->devPrivates[exaXorgScreenPrivateIndex].ptr = pScreenPriv;

    pScreenPriv->SavedEnableDisableFBAccess = pScrn->EnableDisableFBAccess;
    pScrn->EnableDisableFBAccess = exaXorgEnableDisableFBAccess;
    
    pScreenPriv->SavedCloseScreen = pScreen->CloseScreen;
    pScreen->CloseScreen = exaXorgCloseScreen;
    
}

static MODULESETUPPROTO(exaSetup);

/*ARGSUSED*/
static const OptionInfoRec *
EXAAvailableOptions(void *unused)
{
    return (EXAOptions);
}

static XF86ModuleVersionInfo exaVersRec =
{
	"exa",
	MODULEVENDORSTRING,
	MODINFOSTRING1,
	MODINFOSTRING2,
	XORG_VERSION_CURRENT,
	EXA_VERSION_MAJOR, EXA_VERSION_MINOR, EXA_VERSION_RELEASE,
	ABI_CLASS_VIDEODRV,		/* requires the video driver ABI */
	ABI_VIDEODRV_VERSION,
	MOD_CLASS_NONE,
	{0,0,0,0}
};

_X_EXPORT XF86ModuleData exaModuleData = { &exaVersRec, exaSetup, NULL };

static ModuleInfoRec EXA = {
    1,
    "EXA",
    NULL,
    0,
    EXAAvailableOptions,
};

/*ARGSUSED*/
static pointer
exaSetup(pointer Module, pointer Options, int *ErrorMajor, int *ErrorMinor)
{
    static Bool Initialised = FALSE;

    if (!Initialised) {
	Initialised = TRUE;
	xf86AddModuleInfo(&EXA, Module);
    }

    return (pointer)TRUE;
}