/*		DirectDraw Base Functions
 *
 * Copyright 1997-1999 Marcus Meissner
 * Copyright 1998 Lionel Ulmer (most of Direct3D stuff)
 * Copyright 2000 TransGaming Technologies Inc.
 *
 * This file contains the (internal) driver registration functions,
 * driver enumeration APIs and DirectDraw creation functions.
 */

#include "config.h"

#include <assert.h>
#include <string.h>
#include <stdlib.h>

#include "winerror.h"
#include "debugtools.h"
#include "heap.h"

#include "ddraw.h"
#include "d3d.h"

/* This for all the enumeration and creation of D3D-related objects */
#include "ddraw_private.h"

#define MAX_DDRAW_DRIVERS 3
static const ddraw_driver* DDRAW_drivers[MAX_DDRAW_DRIVERS];
static int DDRAW_num_drivers; /* = 0 */
static int DDRAW_default_driver;

DEFAULT_DEBUG_CHANNEL(ddraw);

/**********************************************************************/

typedef struct {
    LPVOID lpCallback;
    LPVOID lpContext; 
} DirectDrawEnumerateProcData;

/***********************************************************************
 *		DirectDrawEnumerateExA (DDRAW.*)
 */
HRESULT WINAPI DirectDrawEnumerateExA(
    LPDDENUMCALLBACKEXA lpCallback, LPVOID lpContext, DWORD dwFlags)
{
    int i;
    TRACE("(%p,%p, %08lx)\n", lpCallback, lpContext, dwFlags);

    if (TRACE_ON(ddraw)) {
	DPRINTF("  Flags : ");
	if (dwFlags & DDENUM_ATTACHEDSECONDARYDEVICES)
	    DPRINTF("DDENUM_ATTACHEDSECONDARYDEVICES ");
	if (dwFlags & DDENUM_DETACHEDSECONDARYDEVICES)
	    DPRINTF("DDENUM_DETACHEDSECONDARYDEVICES ");
	if (dwFlags & DDENUM_NONDISPLAYDEVICES)
	    DPRINTF("DDENUM_NONDISPLAYDEVICES ");
	DPRINTF("\n");
    }

    for (i=0; i<DDRAW_num_drivers; i++)
    {
        TRACE("Enumerating %s/%s interface\n",
	      DDRAW_drivers[i]->info->szDriver,
	      DDRAW_drivers[i]->info->szDescription);

	/* We have to pass NULL from the primary display device.
	 * RoadRage chapter 6's enumeration routine expects it. */
	if (!lpCallback((DDRAW_default_driver == i) ? NULL
			:(LPGUID)&DDRAW_drivers[i]->info->guidDeviceIdentifier,
			(LPSTR)DDRAW_drivers[i]->info->szDescription,
			(LPSTR)DDRAW_drivers[i]->info->szDriver,
			lpContext, 0))
	    return DD_OK;
    }

    /* Unsupported flags */
    if (dwFlags & DDENUM_NONDISPLAYDEVICES) {
	FIXME("no non-display devices supported.\n");
    }
    if (dwFlags & DDENUM_DETACHEDSECONDARYDEVICES) {
	FIXME("no detached secondary devices supported.\n");
    }

    return DD_OK;
}

/***********************************************************************
 *		DirectDrawEnumerateExW (DDRAW.*)
 */

static BOOL CALLBACK DirectDrawEnumerateExProcW(
    GUID *lpGUID, LPSTR lpDriverDescription, LPSTR lpDriverName, 
    LPVOID lpContext, HMONITOR hm)
{
    DirectDrawEnumerateProcData *pEPD = (DirectDrawEnumerateProcData*)lpContext;
    LPWSTR lpDriverDescriptionW =
	HEAP_strdupAtoW(GetProcessHeap(), 0, lpDriverDescription);
    LPWSTR lpDriverNameW =
	HEAP_strdupAtoW(GetProcessHeap(), 0, lpDriverName);

    BOOL bResult = (*(LPDDENUMCALLBACKEXW *) pEPD->lpCallback)(
	lpGUID, lpDriverDescriptionW, lpDriverNameW, pEPD->lpContext, hm);

    HeapFree(GetProcessHeap(), 0, lpDriverDescriptionW);
    HeapFree(GetProcessHeap(), 0, lpDriverNameW);
    return bResult;
}

HRESULT WINAPI DirectDrawEnumerateExW(
  LPDDENUMCALLBACKEXW lpCallback, LPVOID lpContext, DWORD dwFlags)
{
    DirectDrawEnumerateProcData epd;
    epd.lpCallback = (LPVOID) lpCallback;
    epd.lpContext = lpContext;

    return DirectDrawEnumerateExA(DirectDrawEnumerateExProcW, (LPVOID) &epd, 0);
}

/***********************************************************************
 *		DirectDrawEnumerateA (DDRAW.*)
 */

static BOOL CALLBACK DirectDrawEnumerateProcA(
	GUID *lpGUID, LPSTR lpDriverDescription, LPSTR lpDriverName, 
	LPVOID lpContext, HMONITOR hm)
{
    DirectDrawEnumerateProcData *pEPD = (DirectDrawEnumerateProcData*)lpContext;

    return ((LPDDENUMCALLBACKA) pEPD->lpCallback)(
	lpGUID, lpDriverDescription, lpDriverName, pEPD->lpContext);
}

HRESULT WINAPI DirectDrawEnumerateA(
  LPDDENUMCALLBACKA lpCallback, LPVOID lpContext) 
{
    DirectDrawEnumerateProcData epd;  
    epd.lpCallback = (LPVOID) lpCallback;
    epd.lpContext = lpContext;

    return DirectDrawEnumerateExA(DirectDrawEnumerateProcA, (LPVOID) &epd, 0);
}

/***********************************************************************
 *		DirectDrawEnumerateW (DDRAW.*)
 */

static BOOL WINAPI DirectDrawEnumerateProcW(
  GUID *lpGUID, LPWSTR lpDriverDescription, LPWSTR lpDriverName, 
  LPVOID lpContext, HMONITOR hm)
{
    DirectDrawEnumerateProcData *pEPD = (DirectDrawEnumerateProcData*)lpContext;
  
    return ((LPDDENUMCALLBACKW) pEPD->lpCallback)(
	lpGUID, lpDriverDescription, lpDriverName, pEPD->lpContext);
}

HRESULT WINAPI DirectDrawEnumerateW(
  LPDDENUMCALLBACKW lpCallback, LPVOID lpContext) 
{
    DirectDrawEnumerateProcData epd;
    epd.lpCallback = (LPVOID) lpCallback;
    epd.lpContext = lpContext;

    return DirectDrawEnumerateExW(DirectDrawEnumerateProcW, (LPVOID) &epd, 0);
}

/***********************************************************************
 *		DirectDrawCreate
 */

const ddraw_driver* DDRAW_FindDriver(const GUID* pGUID)
{
    static const GUID zeroGUID; /* gets zero-inited */

    TRACE("(%s)\n", pGUID ? debugstr_guid(pGUID) : "(null)");

    if (DDRAW_num_drivers == 0) return NULL;

    if (pGUID == (LPGUID)DDCREATE_EMULATIONONLY
	|| pGUID == (LPGUID)DDCREATE_HARDWAREONLY)
	pGUID = NULL;

    if (pGUID == NULL || memcmp(pGUID, &zeroGUID, sizeof(GUID)) == 0)
    {
	/* Use the default driver. */
	return DDRAW_drivers[DDRAW_default_driver];
    }
    else
    {
	/* Look for a matching GUID. */

	int i;
	for (i=0; i < DDRAW_num_drivers; i++)
	{
	    if (IsEqualGUID(pGUID,
			    &DDRAW_drivers[i]->info->guidDeviceIdentifier))
		break;
	}

	if (i < DDRAW_num_drivers)
	{
	    return DDRAW_drivers[i];
	}
	else
	{
	    ERR("(%s): did not recognize requested GUID.\n",debugstr_guid(pGUID));
	    return NULL;
	}
    }
}

static HRESULT DDRAW_Create(
	LPGUID lpGUID, LPVOID *lplpDD, LPUNKNOWN pUnkOuter, REFIID iid, BOOL ex
) {
    const ddraw_driver* driver;
    LPDIRECTDRAW7 pDD;
    HRESULT hr;

    if (DDRAW_num_drivers == 0)
    {
	WARN("no DirectDraw drivers registered\n");
	return DDERR_INVALIDDIRECTDRAWGUID;
    }

    if (lpGUID == (LPGUID)DDCREATE_EMULATIONONLY
	|| lpGUID == (LPGUID)DDCREATE_HARDWAREONLY)
	lpGUID = NULL;

    TRACE("(%s,%p,%p)\n",debugstr_guid(lpGUID),lplpDD,pUnkOuter);

    if (pUnkOuter != NULL)
	return DDERR_INVALIDPARAMS; /* CLASS_E_NOAGGREGATION? */

    driver = DDRAW_FindDriver(lpGUID);
    if (driver == NULL) return DDERR_INVALIDDIRECTDRAWGUID;

    hr = driver->create(lpGUID, &pDD, pUnkOuter, ex);
    if (FAILED(hr)) return hr;

    hr = IDirectDraw7_QueryInterface(pDD, iid, lplpDD);
    IDirectDraw7_Release(pDD);
    return hr;
}

/***********************************************************************
 *		DirectDrawCreate
 *
 * Only creates legacy IDirectDraw interfaces.
 * Cannot create IDirectDraw7 interfaces.
 * In theory.
 */
HRESULT WINAPI DirectDrawCreate(
	LPGUID lpGUID, LPDIRECTDRAW* lplpDD, LPUNKNOWN pUnkOuter
) {
  return DDRAW_Create(lpGUID,(LPVOID*)lplpDD,pUnkOuter,&IID_IDirectDraw,FALSE);
}

/***********************************************************************
 *		DirectDrawCreateEx
 *
 * Only creates new IDirectDraw7 interfaces.
 * Supposed to fail if legacy interfaces are requested.
 * In theory.
 */
HRESULT WINAPI DirectDrawCreateEx(
	LPGUID lpGUID, LPVOID* lplpDD, REFIID iid, LPUNKNOWN pUnkOuter
) {
    if (!IsEqualGUID(iid, &IID_IDirectDraw7))
	return DDERR_INVALIDPARAMS;

  return DDRAW_Create(lpGUID, lplpDD, pUnkOuter, iid, TRUE);
}

extern HRESULT Uninit_DirectDraw_Create(const GUID*, LPDIRECTDRAW7*,
					LPUNKNOWN, BOOL);

/* This is for the class factory. */
static HRESULT DDRAW_CreateDirectDraw(IUnknown* pUnkOuter, REFIID iid,
				      LPVOID* ppObj)
{
    LPDIRECTDRAW7 pDD;
    HRESULT hr;

    hr = Uninit_DirectDraw_Create(NULL, &pDD, pUnkOuter, TRUE); /* ex? */
    if (FAILED(hr)) return hr;

    hr = IDirectDraw7_QueryInterface(pDD, iid, ppObj);
    IDirectDraw_Release(pDD);
    return hr;
}

/******************************************************************************
 * DirectDraw ClassFactory
 */
typedef struct {
    ICOM_VFIELD_MULTI(IClassFactory);

    DWORD ref;
    HRESULT (*pfnCreateInstance)(IUnknown *pUnkOuter, REFIID iid,
				 LPVOID *ppObj);
} IClassFactoryImpl;

struct object_creation_info
{
    const CLSID *clsid;
    HRESULT (*pfnCreateInstance)(IUnknown *pUnkOuter, REFIID riid,
				 LPVOID *ppObj);
};

/* There should be more, but these are the only ones listed in the header
 * file. */
extern HRESULT DDRAW_CreateDirectDrawClipper(IUnknown *pUnkOuter, REFIID riid,
					     LPVOID *ppObj);

static const struct object_creation_info object_creation[] =
{
    { &CLSID_DirectDraw,       	DDRAW_CreateDirectDraw },
    { &CLSID_DirectDraw7,	DDRAW_CreateDirectDraw },
    { &CLSID_DirectDrawClipper,	DDRAW_CreateDirectDrawClipper }
};

static HRESULT WINAPI 
DDCF_QueryInterface(LPCLASSFACTORY iface,REFIID riid,LPVOID *ppobj)
{
    ICOM_THIS(IClassFactoryImpl,iface);

    if (IsEqualGUID(riid, &IID_IUnknown)
	|| IsEqualGUID(riid, &IID_IClassFactory))
    {
	IClassFactory_AddRef(iface);
	*ppobj = This;
	return S_OK;
    }

    WARN("(%p)->(%s,%p),not found\n",This,debugstr_guid(riid),ppobj);
    return E_NOINTERFACE;
}

static ULONG WINAPI DDCF_AddRef(LPCLASSFACTORY iface) {
    ICOM_THIS(IClassFactoryImpl,iface);
    return ++(This->ref);
}

static ULONG WINAPI DDCF_Release(LPCLASSFACTORY iface) {
    ICOM_THIS(IClassFactoryImpl,iface);

    ULONG ref = --This->ref;

    if (ref == 0)
	HeapFree(GetProcessHeap(), 0, This);

    return ref;
}


static HRESULT WINAPI DDCF_CreateInstance(
	LPCLASSFACTORY iface,LPUNKNOWN pOuter,REFIID riid,LPVOID *ppobj
) {
    ICOM_THIS(IClassFactoryImpl,iface);

    TRACE("(%p)->(%p,%s,%p)\n",This,pOuter,debugstr_guid(riid),ppobj);

    return This->pfnCreateInstance(pOuter, riid, ppobj);
}

static HRESULT WINAPI DDCF_LockServer(LPCLASSFACTORY iface,BOOL dolock) {
    ICOM_THIS(IClassFactoryImpl,iface);
    FIXME("(%p)->(%d),stub!\n",This,dolock);
    return S_OK;
}

static ICOM_VTABLE(IClassFactory) DDCF_Vtbl = 
{
    ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
    DDCF_QueryInterface,
    DDCF_AddRef,
    DDCF_Release,
    DDCF_CreateInstance,
    DDCF_LockServer
};

/*******************************************************************************
 * DllGetClassObject [DDRAW.13]
 * Retrieves class object from a DLL object
 *
 * NOTES
 *    Docs say returns STDAPI
 *
 * PARAMS
 *    rclsid [I] CLSID for the class object
 *    riid   [I] Reference to identifier of interface for class object
 *    ppv    [O] Address of variable to receive interface pointer for riid
 *
 * RETURNS
 *    Success: S_OK
 *    Failure: CLASS_E_CLASSNOTAVAILABLE, E_OUTOFMEMORY, E_INVALIDARG,
 *             E_UNEXPECTED
 */
DWORD WINAPI DDRAW_DllGetClassObject(REFCLSID rclsid,REFIID riid,LPVOID *ppv)
{
    int i;
    IClassFactoryImpl *factory;

    TRACE("(%p,%p,%p)\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);

    if ( !IsEqualGUID( &IID_IClassFactory, riid )
	 && ! IsEqualGUID( &IID_IUnknown, riid) )
	return E_NOINTERFACE;

    for (i=0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++)
    {
	if (IsEqualGUID(object_creation[i].clsid, rclsid))
	    break;
    }

    if (i == sizeof(object_creation)/sizeof(object_creation[0]))
    {
	FIXME("%s: no class found.\n", debugstr_guid(rclsid));
	return CLASS_E_CLASSNOTAVAILABLE;
    }

    factory = HeapAlloc(GetProcessHeap(), 0, sizeof(*factory));
    if (factory == NULL) return E_OUTOFMEMORY;

    ICOM_INIT_INTERFACE(factory, IClassFactory, DDCF_Vtbl);
    factory->ref = 1;

    factory->pfnCreateInstance = object_creation[i].pfnCreateInstance;

    *ppv = ICOM_INTERFACE(factory, IClassFactory);
    return S_OK;
}


/*******************************************************************************
 * DllCanUnloadNow [DDRAW.12]  Determines whether the DLL is in use.
 *
 * RETURNS
 *    Success: S_OK
 *    Failure: S_FALSE
 */
DWORD WINAPI DDRAW_DllCanUnloadNow(void) {
    FIXME("(void): stub\n");
    return S_FALSE;
}

/******************************************************************************
 * Initialisation
 */

/* Choose which driver is considered the primary display driver. It will
 * be created when we get a NULL guid for the DirectDrawCreate(Ex). */
static int DDRAW_ChooseDefaultDriver(void)
{
    int i;
    int best = 0;
    int best_score = 0;

    assert(DDRAW_num_drivers > 0);

    /* This algorithm is really stupid. */
    for (i=0; i < DDRAW_num_drivers; i++)
    {
	if (DDRAW_drivers[i]->preference > best_score)
	{
	    best_score = DDRAW_drivers[i]->preference;
	    best = i;
	}
    }

    assert(best_score > 0);

    return best;
}

BOOL WINAPI DDRAW_DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
{
    /* If we were sufficiently cool, DDraw drivers would just be COM
     * objects, registered with a particular component category. */

    DDRAW_User_Init(hInstDLL, fdwReason, lpv);

#ifdef HAVE_LIBXXF86VM
    DDRAW_XVidMode_Init(hInstDLL, fdwReason, lpv);
#endif
#ifdef HAVE_LIBXXF86DGA2
    DDRAW_XF86DGA2_Init(hInstDLL, fdwReason, lpv);
#endif

    if (DDRAW_num_drivers > 0)
	DDRAW_default_driver = DDRAW_ChooseDefaultDriver();

    return TRUE;
}

/* Register a direct draw driver. This should be called from your init
 * function. (That's why there is no locking: your init func is called from
 * our DllInit, which is serialised.) */
void DDRAW_register_driver(const ddraw_driver *driver)
{
    int i;

    for (i = 0; i < DDRAW_num_drivers; i++)
    {
	if (DDRAW_drivers[i] == driver)
	{
	    ERR("Driver reregistering %p\n", driver);
	    return;
	}
    }

    if (DDRAW_num_drivers == sizeof(DDRAW_drivers)/sizeof(DDRAW_drivers[0]))
    {
	ERR("too many DDRAW drivers\n");
	return;
    }

    DDRAW_drivers[DDRAW_num_drivers++] = driver;
}

/* This totally doesn't belong here. */
LONG DDRAW_width_bpp_to_pitch(DWORD width, DWORD bpp)
{
    LONG pitch;

    assert(bpp != 0); /* keeps happening... */

    if (bpp == 15) bpp = 16;
    pitch = width * (bpp / 8);
    return pitch + (8 - (pitch % 8)) % 8;
}