/* Direct3D Viewport
 * Copyright (c) 1998 Lionel ULMER
 * Copyright (c) 2006-2007 Stefan DÖSINGER
 *
 * This file contains the implementation of Direct3DViewport2.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"
#include "wine/port.h"

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

#define COBJMACROS
#define NONAMELESSUNION

#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wingdi.h"
#include "wine/exception.h"

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

#include "ddraw_private.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(d3d7);

/*****************************************************************************
 * Helper functions
 *****************************************************************************/

/*****************************************************************************
 * viewport_activate
 *
 * activates the viewport using IDirect3DDevice7::SetViewport
 *
 *****************************************************************************/
void viewport_activate(IDirect3DViewportImpl* This, BOOL ignore_lights) {
    IDirect3DLightImpl* light;
    D3DVIEWPORT7 vp;

    if (!ignore_lights) {
        /* Activate all the lights associated with this context */
        light = This->lights;

        while (light != NULL) {
            light->activate(light);
            light = light->next;
        }
    }

    /* And copy the values in the structure used by the device */
    if (This->use_vp2) {
        vp.dwX = This->viewports.vp2.dwX;
	vp.dwY = This->viewports.vp2.dwY;
	vp.dwHeight = This->viewports.vp2.dwHeight;
	vp.dwWidth = This->viewports.vp2.dwWidth;
	vp.dvMinZ = This->viewports.vp2.dvMinZ;
	vp.dvMaxZ = This->viewports.vp2.dvMaxZ;
    } else {
        vp.dwX = This->viewports.vp1.dwX;
	vp.dwY = This->viewports.vp1.dwY;
	vp.dwHeight = This->viewports.vp1.dwHeight;
	vp.dwWidth = This->viewports.vp1.dwWidth;
	vp.dvMinZ = This->viewports.vp1.dvMinZ;
	vp.dvMaxZ = This->viewports.vp1.dvMaxZ;
    }
    
    /* And also set the viewport */
    IDirect3DDevice7_SetViewport((IDirect3DDevice7 *)This->active_device, &vp);
}

/*****************************************************************************
 * _dump_D3DVIEWPORT, _dump_D3DVIEWPORT2
 *
 * Writes viewport information to TRACE
 *
 *****************************************************************************/
static void _dump_D3DVIEWPORT(const D3DVIEWPORT *lpvp)
{
    TRACE("    - dwSize = %d   dwX = %d   dwY = %d\n",
	  lpvp->dwSize, lpvp->dwX, lpvp->dwY);
    TRACE("    - dwWidth = %d   dwHeight = %d\n",
	  lpvp->dwWidth, lpvp->dwHeight);
    TRACE("    - dvScaleX = %f   dvScaleY = %f\n",
	  lpvp->dvScaleX, lpvp->dvScaleY);
    TRACE("    - dvMaxX = %f   dvMaxY = %f\n",
	  lpvp->dvMaxX, lpvp->dvMaxY);
    TRACE("    - dvMinZ = %f   dvMaxZ = %f\n",
	  lpvp->dvMinZ, lpvp->dvMaxZ);
}

static void _dump_D3DVIEWPORT2(const D3DVIEWPORT2 *lpvp)
{
    TRACE("    - dwSize = %d   dwX = %d   dwY = %d\n",
	  lpvp->dwSize, lpvp->dwX, lpvp->dwY);
    TRACE("    - dwWidth = %d   dwHeight = %d\n",
	  lpvp->dwWidth, lpvp->dwHeight);
    TRACE("    - dvClipX = %f   dvClipY = %f\n",
	  lpvp->dvClipX, lpvp->dvClipY);
    TRACE("    - dvClipWidth = %f   dvClipHeight = %f\n",
	  lpvp->dvClipWidth, lpvp->dvClipHeight);
    TRACE("    - dvMinZ = %f   dvMaxZ = %f\n",
	  lpvp->dvMinZ, lpvp->dvMaxZ);
}

/*****************************************************************************
 * IUnknown Methods.
 *****************************************************************************/

/*****************************************************************************
 * IDirect3DViewport3::QueryInterface
 *
 * A normal QueryInterface. Can query all interface versions and the
 * IUnknown interface. The VTables of the different versions
 * are equal
 *
 * Params:
 *  refiid: Interface id queried for
 *  obj: Address to write the interface pointer to
 *
 * Returns:
 *  S_OK on success.
 *  E_NOINTERFACE if the requested interface wasn't found
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_QueryInterface(IDirect3DViewport3 *iface,
                                     REFIID riid,
                                     void **obp)
{
    TRACE("(%p)->(%s,%p)\n", iface, debugstr_guid(riid), obp);

    *obp = NULL;

    if ( IsEqualGUID(&IID_IUnknown,  riid) ||
	 IsEqualGUID(&IID_IDirect3DViewport, riid) ||
	 IsEqualGUID(&IID_IDirect3DViewport2, riid) ||
	 IsEqualGUID(&IID_IDirect3DViewport3, riid) ) {
        IDirect3DViewport3_AddRef(iface);
        *obp = iface;
	TRACE("  Creating IDirect3DViewport1/2/3 interface %p\n", *obp);
	return S_OK;
    }
    FIXME("(%p): interface for IID %s NOT found!\n", iface, debugstr_guid(riid));
    return E_NOINTERFACE;
}

/*****************************************************************************
 * IDirect3DViewport3::AddRef
 *
 * Increases the refcount.
 *
 * Returns:
 *  The new refcount
 *
 *****************************************************************************/
static ULONG WINAPI
IDirect3DViewportImpl_AddRef(IDirect3DViewport3 *iface)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    ULONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p)->() incrementing from %u.\n", This, ref - 1);

    return ref;
}

/*****************************************************************************
 * IDirect3DViewport3::Release
 *
 * Reduces the refcount. If it falls to 0, the interface is released
 *
 * Returns:
 *  The new refcount
 *
 *****************************************************************************/
static ULONG WINAPI
IDirect3DViewportImpl_Release(IDirect3DViewport3 *iface)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    ULONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p)->() decrementing from %u.\n", This, ref + 1);

    if (!ref) {
        HeapFree(GetProcessHeap(), 0, This);
	return 0;
    }
    return ref;
}

/*****************************************************************************
 * IDirect3DViewport Methods.
 *****************************************************************************/

/*****************************************************************************
 * IDirect3DViewport3::Initialize
 *
 * No-op initialization.
 *
 * Params:
 *  Direct3D: The direct3D device this viewport is assigned to
 *
 * Returns:
 *  DDERR_ALREADYINITIALIZED
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_Initialize(IDirect3DViewport3 *iface,
                                 IDirect3D *Direct3D)
{
    TRACE("(%p)->(%p) no-op...\n", iface, Direct3D);
    return DDERR_ALREADYINITIALIZED;
}

/*****************************************************************************
 * IDirect3DViewport3::GetViewport
 *
 * Returns the viewport data assigned to this viewport interface
 *
 * Params:
 *  Data: Address to store the data
 *
 * Returns:
 *  D3D_OK on success
 *  DDERR_INVALIDPARAMS if Data is NULL
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_GetViewport(IDirect3DViewport3 *iface,
                                  D3DVIEWPORT *lpData)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    DWORD dwSize;
    TRACE("(%p/%p)->(%p)\n", This, iface, lpData);

    EnterCriticalSection(&ddraw_cs);
    if (This->use_vp2 != 0) {
        ERR("  Requesting to get a D3DVIEWPORT struct where a D3DVIEWPORT2 was set !\n");
        LeaveCriticalSection(&ddraw_cs);
        return DDERR_INVALIDPARAMS;
    }
    dwSize = lpData->dwSize;
    memset(lpData, 0, dwSize);
    memcpy(lpData, &(This->viewports.vp1), dwSize);

    if (TRACE_ON(d3d7)) {
        TRACE("  returning D3DVIEWPORT :\n");
	_dump_D3DVIEWPORT(lpData);
    }
    LeaveCriticalSection(&ddraw_cs);

    return DD_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::SetViewport
 *
 * Sets the viewport information for this interface
 *
 * Params:
 *  lpData: Viewport to set
 *
 * Returns:
 *  D3D_OK on success
 *  DDERR_INVALIDPARAMS if Data is NULL
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_SetViewport(IDirect3DViewport3 *iface,
                                  D3DVIEWPORT *lpData)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    LPDIRECT3DVIEWPORT3 current_viewport;
    TRACE("(%p/%p)->(%p)\n", This, iface, lpData);

    if (TRACE_ON(d3d7)) {
        TRACE("  getting D3DVIEWPORT :\n");
	_dump_D3DVIEWPORT(lpData);
    }

    EnterCriticalSection(&ddraw_cs);
    This->use_vp2 = 0;
    memset(&(This->viewports.vp1), 0, sizeof(This->viewports.vp1));
    memcpy(&(This->viewports.vp1), lpData, lpData->dwSize);

    /* Tests on two games show that these values are never used properly so override
       them with proper ones :-)
    */
    This->viewports.vp1.dvMinZ = 0.0;
    This->viewports.vp1.dvMaxZ = 1.0;

    if (This->active_device) {
        IDirect3DDevice3 *d3d_device3 = (IDirect3DDevice3 *)&This->active_device->IDirect3DDevice3_vtbl;
        IDirect3DDevice3_GetCurrentViewport(d3d_device3, &current_viewport);
        if (current_viewport) {
            if ((IDirect3DViewportImpl *)current_viewport == This) This->activate(This, FALSE);
            IDirect3DViewport3_Release(current_viewport);
        }
    }
    LeaveCriticalSection(&ddraw_cs);

    return DD_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::TransformVertices
 *
 * Transforms vertices by the transformation matrix.
 *
 * This function is pretty similar to IDirect3DVertexBuffer7::ProcessVertices,
 * so it's tempting to forward it to there. However, there are some
 * tiny differences. First, the lpOffscreen flag that is reported back,
 * then there is the homogeneous vertex that is generated. Also there's a lack
 * of FVFs, but still a custom stride. Last, the d3d1 - d3d3 viewport has some
 * settings (scale) that d3d7 and wined3d do not have. All in all wrapping to
 * ProcessVertices doesn't pay of in terms of wrapper code needed and code
 * reused.
 *
 * Params:
 *  dwVertexCount: The number of vertices to be transformed
 *  lpData: Pointer to the vertex data
 *  dwFlags: D3DTRANSFORM_CLIPPED or D3DTRANSFORM_UNCLIPPED
 *  lpOffScreen: Set to the clipping plane clipping the vertex, if only one
 *               vertex is transformed and clipping is on. 0 otherwise
 *
 * Returns:
 *  D3D_OK on success
 *  D3DERR_VIEWPORTHASNODEVICE if the viewport is not assigned to a device
 *  DDERR_INVALIDPARAMS if no clipping flag is specified
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_TransformVertices(IDirect3DViewport3 *iface,
                                        DWORD dwVertexCount,
                                        D3DTRANSFORMDATA *lpData,
                                        DWORD dwFlags,
                                        DWORD *lpOffScreen)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    D3DMATRIX view_mat, world_mat, proj_mat, mat;
    float *in;
    float *out;
    float x, y, z, w;
    unsigned int i;
    D3DVIEWPORT vp = This->viewports.vp1;
    D3DHVERTEX *outH;
    TRACE("(%p)->(%08x,%p,%08x,%p)\n", This, dwVertexCount, lpData, dwFlags, lpOffScreen);

    /* Tests on windows show that Windows crashes when this occurs,
     * so don't return the (intuitive) return value
    if(!This->active_device)
    {
        WARN("No device active, returning D3DERR_VIEWPORTHASNODEVICE\n");
        return D3DERR_VIEWPORTHASNODEVICE;
    }
     */

    if(!(dwFlags & (D3DTRANSFORM_UNCLIPPED | D3DTRANSFORM_CLIPPED)))
    {
        WARN("No clipping flag passed, returning DDERR_INVALIDPARAMS\n");
        return DDERR_INVALIDPARAMS;
    }


    EnterCriticalSection(&ddraw_cs);
    IWineD3DDevice_GetTransform(This->active_device->wineD3DDevice,
                                D3DTRANSFORMSTATE_VIEW,
                                (WINED3DMATRIX*) &view_mat);

    IWineD3DDevice_GetTransform(This->active_device->wineD3DDevice,
                                D3DTRANSFORMSTATE_PROJECTION,
                                (WINED3DMATRIX*) &proj_mat);

    IWineD3DDevice_GetTransform(This->active_device->wineD3DDevice,
                                WINED3DTS_WORLDMATRIX(0),
                                (WINED3DMATRIX*) &world_mat);
    multiply_matrix(&mat,&view_mat,&world_mat);
    multiply_matrix(&mat,&proj_mat,&mat);

    in = lpData->lpIn;
    out = lpData->lpOut;
    outH = lpData->lpHOut;
    for(i = 0; i < dwVertexCount; i++)
    {
        x = (in[0] * mat._11) + (in[1] * mat._21) + (in[2] * mat._31) + (1.0 * mat._41);
        y = (in[0] * mat._12) + (in[1] * mat._22) + (in[2] * mat._32) + (1.0 * mat._42);
        z = (in[0] * mat._13) + (in[1] * mat._23) + (in[2] * mat._33) + (1.0 * mat._43);
        w = (in[0] * mat._14) + (in[1] * mat._24) + (in[2] * mat._34) + (1.0 * mat._44);

        if(dwFlags & D3DTRANSFORM_CLIPPED)
        {
            /* If clipping is enabled, Windows assumes that outH is
             * a valid pointer
             */
            outH[i].u1.hx = x; outH[i].u2.hy = y; outH[i].u3.hz = z;

            outH[i].dwFlags = 0;
            if(x * vp.dvScaleX > ((float) vp.dwWidth * 0.5))
                outH[i].dwFlags |= D3DCLIP_RIGHT;
            if(x * vp.dvScaleX <= -((float) vp.dwWidth) * 0.5)
                outH[i].dwFlags |= D3DCLIP_LEFT;
            if(y * vp.dvScaleY > ((float) vp.dwHeight * 0.5))
                outH[i].dwFlags |= D3DCLIP_TOP;
            if(y * vp.dvScaleY <= -((float) vp.dwHeight) * 0.5)
                outH[i].dwFlags |= D3DCLIP_BOTTOM;
            if(z < 0.0)
                outH[i].dwFlags |= D3DCLIP_FRONT;
            if(z > 1.0)
                outH[i].dwFlags |= D3DCLIP_BACK;

            if(outH[i].dwFlags)
            {
                /* Looks like native just drops the vertex, leaves whatever data
                 * it has in the output buffer and goes on with the next vertex.
                 * The exact scheme hasn't been figured out yet, but windows
                 * definitely writes something there.
                 */
                out[0] = x;
                out[1] = y;
                out[2] = z;
                out[3] = w;
                in = (float *) ((char *) in + lpData->dwInSize);
                out = (float *) ((char *) out + lpData->dwOutSize);
                continue;
            }
        }

        w = 1 / w;
        x *= w; y *= w; z *= w;

        out[0] = vp.dwWidth / 2 + vp.dwX + x * vp.dvScaleX;
        out[1] = vp.dwHeight / 2 + vp.dwY - y * vp.dvScaleY;
        out[2] = z;
        out[3] = w;
        in = (float *) ((char *) in + lpData->dwInSize);
        out = (float *) ((char *) out + lpData->dwOutSize);
    }

    /* According to the d3d test, the offscreen flag is set only
     * if exactly one vertex is transformed. Its not documented,
     * but the test shows that the lpOffscreen flag is set to the
     * flag combination of clipping planes that clips the vertex.
     *
     * If clipping is requested, Windows assumes that the offscreen
     * param is a valid pointer.
     */
    if(dwVertexCount == 1 && dwFlags & D3DTRANSFORM_CLIPPED)
    {
        *lpOffScreen = outH[0].dwFlags;
    }
    else if(*lpOffScreen)
    {
        *lpOffScreen = 0;
    }
    LeaveCriticalSection(&ddraw_cs);

    TRACE("All done\n");
    return DD_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::LightElements
 *
 * The DirectX 5.0 sdk says that it's not implemented
 *
 * Params:
 *  ?
 *
 * Returns:
 *  DDERR_UNSUPPORTED
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_LightElements(IDirect3DViewport3 *iface,
                                    DWORD dwElementCount,
                                    LPD3DLIGHTDATA lpData)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    TRACE("(%p)->(%08x,%p): Unimplemented!\n", This, dwElementCount, lpData);
    return DDERR_UNSUPPORTED;
}

/*****************************************************************************
 * IDirect3DViewport3::SetBackground
 *
 * Sets tje background material
 *
 * Params:
 *  hMat: Handle from a IDirect3DMaterial interface
 *
 * Returns:
 *  D3D_OK on success
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_SetBackground(IDirect3DViewport3 *iface,
                                    D3DMATERIALHANDLE hMat)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    TRACE("(%p)->(%d)\n", This, hMat);

    EnterCriticalSection(&ddraw_cs);
    if(hMat && hMat > This->ddraw->d3ddevice->numHandles)
    {
        WARN("Specified Handle %d out of range\n", hMat);
        LeaveCriticalSection(&ddraw_cs);
        return DDERR_INVALIDPARAMS;
    }
    else if(hMat && This->ddraw->d3ddevice->Handles[hMat - 1].type != DDrawHandle_Material)
    {
        WARN("Handle %d is not a material handle\n", hMat);
        LeaveCriticalSection(&ddraw_cs);
        return DDERR_INVALIDPARAMS;
    }

    if(hMat)
    {
        This->background = This->ddraw->d3ddevice->Handles[hMat - 1].ptr;
        TRACE(" setting background color : %f %f %f %f\n",
              This->background->mat.u.diffuse.u1.r,
              This->background->mat.u.diffuse.u2.g,
              This->background->mat.u.diffuse.u3.b,
              This->background->mat.u.diffuse.u4.a);
    }
    else
    {
        This->background = NULL;
        TRACE("Setting background to NULL\n");
    }

    LeaveCriticalSection(&ddraw_cs);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::GetBackground
 *
 * Returns the material handle assigned to the background of the viewport
 *
 * Params:
 *  lphMat: Address to store the handle
 *  lpValid: is set to FALSE if no background is set, TRUE if one is set
 *
 * Returns:
 *  D3D_OK
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_GetBackground(IDirect3DViewport3 *iface,
                                    D3DMATERIALHANDLE *lphMat,
                                    BOOL *lpValid)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    TRACE("(%p)->(%p,%p)\n", This, lphMat, lpValid);

    EnterCriticalSection(&ddraw_cs);
    if(lpValid)
    {
        *lpValid = This->background != NULL;
    }
    if(lphMat)
    {
        if(This->background)
        {
            *lphMat = This->background->Handle;
        }
        else
        {
            *lphMat = 0;
        }
    }
    LeaveCriticalSection(&ddraw_cs);

    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::SetBackgroundDepth
 *
 * Sets a surface that represents the background depth. It's contents are
 * used to set the depth buffer in IDirect3DViewport3::Clear
 *
 * Params:
 *  lpDDSurface: Surface to set
 *
 * Returns: D3D_OK, because it's a stub
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_SetBackgroundDepth(IDirect3DViewport3 *iface,
                                         IDirectDrawSurface *lpDDSurface)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    FIXME("(%p)->(%p): stub!\n", This, lpDDSurface);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::GetBackgroundDepth
 *
 * Returns the surface that represents the depth field
 *
 * Params:
 *  lplpDDSurface: Address to store the interface pointer
 *  lpValid: Set to TRUE if a depth is assigned, FALSE otherwise
 *
 * Returns:
 *  D3D_OK, because it's a stub
 *  (DDERR_INVALIDPARAMS if DDSurface of Valid is NULL)
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_GetBackgroundDepth(IDirect3DViewport3 *iface,
                                         IDirectDrawSurface **lplpDDSurface,
                                         LPBOOL lpValid)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    FIXME("(%p)->(%p,%p): stub!\n", This, lplpDDSurface, lpValid);
    return DD_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::Clear
 *
 * Clears the render target and / or the z buffer
 *
 * Params:
 *  dwCount: The amount of rectangles to clear. If 0, the whole buffer is
 *           cleared
 *  lpRects: Pointer to the array of rectangles. If NULL, Count must be 0
 *  dwFlags: D3DCLEAR_ZBUFFER and / or D3DCLEAR_TARGET
 *
 * Returns:
 *  D3D_OK on success
 *  D3DERR_VIEWPORTHASNODEVICE if there's no active device
 *  The return value of IDirect3DDevice7::Clear
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_Clear(IDirect3DViewport3 *iface,
                            DWORD dwCount, 
                            D3DRECT *lpRects,
                            DWORD dwFlags)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    DWORD color = 0x00000000;
    HRESULT hr;
    LPDIRECT3DVIEWPORT3 current_viewport;
    IDirect3DDevice3 *d3d_device3;

    TRACE("(%p/%p)->(%08x,%p,%08x)\n", This, iface, dwCount, lpRects, dwFlags);
    if (This->active_device == NULL) {
        ERR(" Trying to clear a viewport not attached to a device !\n");
	return D3DERR_VIEWPORTHASNODEVICE;
    }
    d3d_device3 = (IDirect3DDevice3 *)&This->active_device->IDirect3DDevice3_vtbl;

    EnterCriticalSection(&ddraw_cs);
    if (dwFlags & D3DCLEAR_TARGET) {
        if (This->background == NULL) {
	    ERR(" Trying to clear the color buffer without background material !\n");
	} else {
	    color = 
	      ((int) ((This->background->mat.u.diffuse.u1.r) * 255) << 16) |
	      ((int) ((This->background->mat.u.diffuse.u2.g) * 255) <<  8) |
	      ((int) ((This->background->mat.u.diffuse.u3.b) * 255) <<  0) |
	      ((int) ((This->background->mat.u.diffuse.u4.a) * 255) << 24);
	}
    }

    /* Need to temporarily activate viewport to clear it. Previously active one will be restored
        afterwards. */
    This->activate(This, TRUE);

    hr = IDirect3DDevice7_Clear((IDirect3DDevice7 *)This->active_device, dwCount, lpRects,
            dwFlags & (D3DCLEAR_ZBUFFER | D3DCLEAR_TARGET), color, 1.0, 0x00000000);

    IDirect3DDevice3_GetCurrentViewport(d3d_device3, &current_viewport);
    if(current_viewport) {
        IDirect3DViewportImpl *vp = (IDirect3DViewportImpl *)current_viewport;
        vp->activate(vp, TRUE);
        IDirect3DViewport3_Release(current_viewport);
    }

    LeaveCriticalSection(&ddraw_cs);
    return hr;
}

/*****************************************************************************
 * IDirect3DViewport3::AddLight
 *
 * Adds an light to the viewport
 *
 * Params:
 *  lpDirect3DLight: Interface of the light to add
 *
 * Returns:
 *  D3D_OK on success
 *  DDERR_INVALIDPARAMS if Direct3DLight is NULL
 *  DDERR_INVALIDPARAMS if there are 8 lights or more
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_AddLight(IDirect3DViewport3 *iface,
                               IDirect3DLight *lpDirect3DLight)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    IDirect3DLightImpl *lpDirect3DLightImpl = (IDirect3DLightImpl *)lpDirect3DLight;
    DWORD i = 0;
    DWORD map = This->map_lights;
    
    TRACE("(%p)->(%p)\n", This, lpDirect3DLight);

    EnterCriticalSection(&ddraw_cs);
    if (This->num_lights >= 8)
    {
        LeaveCriticalSection(&ddraw_cs);
        return DDERR_INVALIDPARAMS;
    }

    /* Find a light number and update both light and viewports objects accordingly */
    while(map&1) {
        map>>=1;
	i++;
    }
    lpDirect3DLightImpl->dwLightIndex = i;
    This->num_lights++;
    This->map_lights |= 1<<i;

    /* Add the light in the 'linked' chain */
    lpDirect3DLightImpl->next = This->lights;
    This->lights = lpDirect3DLightImpl;
    IDirect3DLight_AddRef(lpDirect3DLight);

    /* Attach the light to the viewport */
    lpDirect3DLightImpl->active_viewport = This;
    
    /* If active, activate the light */
    if (This->active_device != NULL) {
        lpDirect3DLightImpl->activate(lpDirect3DLightImpl);
    }

    LeaveCriticalSection(&ddraw_cs);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::DeleteLight
 *
 * Deletes a light from the viewports' light list
 *
 * Params:
 *  lpDirect3DLight: Light to delete
 *
 * Returns:
 *  D3D_OK on success
 *  DDERR_INVALIDPARAMS if the light wasn't found
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_DeleteLight(IDirect3DViewport3 *iface,
                                  IDirect3DLight *lpDirect3DLight)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    IDirect3DLightImpl *lpDirect3DLightImpl = (IDirect3DLightImpl *)lpDirect3DLight;
    IDirect3DLightImpl *cur_light, *prev_light = NULL;
    
    TRACE("(%p)->(%p)\n", This, lpDirect3DLight);

    EnterCriticalSection(&ddraw_cs);
    cur_light = This->lights;
    while (cur_light != NULL) {
        if (cur_light == lpDirect3DLightImpl) {
	    lpDirect3DLightImpl->desactivate(lpDirect3DLightImpl);
	    if (prev_light == NULL) This->lights = cur_light->next;
	    else prev_light->next = cur_light->next;
	    /* Detach the light to the viewport */
	    cur_light->active_viewport = NULL;
	    IDirect3DLight_Release( (IDirect3DLight *)cur_light );
	    This->num_lights--;
	    This->map_lights &= ~(1<<lpDirect3DLightImpl->dwLightIndex);
            LeaveCriticalSection(&ddraw_cs);
            return D3D_OK;
	}
	prev_light = cur_light;
	cur_light = cur_light->next;
    }
    LeaveCriticalSection(&ddraw_cs);

    return DDERR_INVALIDPARAMS;
}

/*****************************************************************************
 * IDirect3DViewport::NextLight
 *
 * Enumerates the lights associated with the viewport
 *
 * Params:
 *  lpDirect3DLight: Light to start with
 *  lplpDirect3DLight: Address to store the successor to
 *
 * Returns:
 *  D3D_OK, because it's a stub
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_NextLight(IDirect3DViewport3 *iface,
                                IDirect3DLight *lpDirect3DLight,
                                IDirect3DLight **lplpDirect3DLight,
                                DWORD dwFlags)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    IDirect3DLightImpl *cur_light, *prev_light = NULL;

    TRACE("(%p)->(%p,%p,%08x)\n", This, lpDirect3DLight, lplpDirect3DLight, dwFlags);

    if (!lplpDirect3DLight)
        return DDERR_INVALIDPARAMS;

    *lplpDirect3DLight = NULL;

    EnterCriticalSection(&ddraw_cs);

    cur_light = This->lights;

    switch (dwFlags) {
        case D3DNEXT_NEXT:
            if (!lpDirect3DLight) {
                LeaveCriticalSection(&ddraw_cs);
                return DDERR_INVALIDPARAMS;
            }
            while (cur_light != NULL) {
                if (cur_light == (IDirect3DLightImpl *)lpDirect3DLight) {
                    *lplpDirect3DLight = (IDirect3DLight*)cur_light->next;
                    break;
                }
                cur_light = cur_light->next;
            }
            break;
        case D3DNEXT_HEAD:
            *lplpDirect3DLight = (IDirect3DLight*)This->lights;
            break;
        case D3DNEXT_TAIL:
            while (cur_light != NULL) {
                prev_light = cur_light;
                cur_light = cur_light->next;
            }
            *lplpDirect3DLight = (IDirect3DLight*)prev_light;
            break;
        default:
            ERR("Unknown flag %d\n", dwFlags);
            break;
    }

    if (*lplpDirect3DLight)
        IDirect3DLight_AddRef(*lplpDirect3DLight);

    LeaveCriticalSection(&ddraw_cs);

    return *lplpDirect3DLight ? D3D_OK : DDERR_INVALIDPARAMS;
}

/*****************************************************************************
 * IDirect3DViewport2 Methods.
 *****************************************************************************/

/*****************************************************************************
 * IDirect3DViewport3::GetViewport2
 *
 * Returns the currently set viewport in a D3DVIEWPORT2 structure.
 * Similar to IDirect3DViewport3::GetViewport
 *
 * Params:
 *  lpData: Pointer to the structure to fill
 *
 * Returns:
 *  D3D_OK on success
 *  DDERR_INVALIDPARAMS if the viewport was set with
 *                      IDirect3DViewport3::SetViewport
 *  DDERR_INVALIDPARAMS if Data is NULL
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_GetViewport2(IDirect3DViewport3 *iface,
                                   D3DVIEWPORT2 *lpData)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    DWORD dwSize;
    TRACE("(%p)->(%p)\n", This, lpData);

    EnterCriticalSection(&ddraw_cs);
    if (This->use_vp2 != 1) {
        ERR("  Requesting to get a D3DVIEWPORT2 struct where a D3DVIEWPORT was set !\n");
        LeaveCriticalSection(&ddraw_cs);
        return DDERR_INVALIDPARAMS;
    }
    dwSize = lpData->dwSize;
    memset(lpData, 0, dwSize);
    memcpy(lpData, &(This->viewports.vp2), dwSize);

    if (TRACE_ON(d3d7)) {
        TRACE("  returning D3DVIEWPORT2 :\n");
	_dump_D3DVIEWPORT2(lpData);
    }

    LeaveCriticalSection(&ddraw_cs);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::SetViewport2
 *
 * Sets the viewport from a D3DVIEWPORT2 structure
 *
 * Params:
 *  lpData: Viewport to set
 *
 * Returns:
 *  D3D_OK on success
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_SetViewport2(IDirect3DViewport3 *iface,
                                   D3DVIEWPORT2 *lpData)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    LPDIRECT3DVIEWPORT3 current_viewport;
    TRACE("(%p/%p)->(%p)\n", This, iface, lpData);

    if (TRACE_ON(d3d7)) {
        TRACE("  getting D3DVIEWPORT2 :\n");
	_dump_D3DVIEWPORT2(lpData);
    }

    EnterCriticalSection(&ddraw_cs);
    This->use_vp2 = 1;
    memset(&(This->viewports.vp2), 0, sizeof(This->viewports.vp2));
    memcpy(&(This->viewports.vp2), lpData, lpData->dwSize);

    if (This->active_device) {
        IDirect3DDevice3 *d3d_device3 = (IDirect3DDevice3 *)&This->active_device->IDirect3DDevice3_vtbl;
        IDirect3DDevice3_GetCurrentViewport(d3d_device3, &current_viewport);
        if (current_viewport) {
            if ((IDirect3DViewportImpl *)current_viewport == This) This->activate(This, FALSE);
            IDirect3DViewport3_Release(current_viewport);
        }
    }
    LeaveCriticalSection(&ddraw_cs);

    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3 Methods.
 *****************************************************************************/

/*****************************************************************************
 * IDirect3DViewport3::SetBackgroundDepth2
 *
 * Sets a IDirectDrawSurface4 surface as the background depth surface
 *
 * Params:
 *  lpDDS: Surface to set
 *
 * Returns:
 *  D3D_OK, because it's stub
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_SetBackgroundDepth2(IDirect3DViewport3 *iface,
                                          IDirectDrawSurface4 *lpDDS)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    FIXME("(%p)->(%p): stub!\n", This, lpDDS);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::GetBackgroundDepth2
 *
 * Returns the IDirect3DSurface4 interface to the background depth surface
 *
 * Params:
 *  lplpDDS: Address to store the interface pointer at
 *  lpValid: Set to true if a surface is assigned
 *
 * Returns:
 *  D3D_OK because it's a stub
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_GetBackgroundDepth2(IDirect3DViewport3 *iface,
                                          IDirectDrawSurface4 **lplpDDS,
                                          BOOL *lpValid)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    FIXME("(%p/%p)->(%p,%p): stub!\n", This, iface, lplpDDS, lpValid);
    return D3D_OK;
}

/*****************************************************************************
 * IDirect3DViewport3::Clear2
 *
 * Another clearing method
 *
 * Params:
 *  Count: Number of rectangles to clear
 *  Rects: Rectangle array to clear
 *  Flags: Some flags :)
 *  Color: Color to fill the render target with
 *  Z: Value to fill the depth buffer with
 *  Stencil: Value to fill the stencil bits with
 *
 * Returns:
 *
 *****************************************************************************/
static HRESULT WINAPI
IDirect3DViewportImpl_Clear2(IDirect3DViewport3 *iface,
                             DWORD dwCount,
                             LPD3DRECT lpRects,
                             DWORD dwFlags,
                             DWORD dwColor,
                             D3DVALUE dvZ,
                             DWORD dwStencil)
{
    IDirect3DViewportImpl *This = (IDirect3DViewportImpl *)iface;
    HRESULT hr;
    LPDIRECT3DVIEWPORT3 current_viewport;
    IDirect3DDevice3 *d3d_device3;
    TRACE("(%p)->(%08x,%p,%08x,%08x,%f,%08x)\n", This, dwCount, lpRects, dwFlags, dwColor, dvZ, dwStencil);

    EnterCriticalSection(&ddraw_cs);
    if (This->active_device == NULL) {
        ERR(" Trying to clear a viewport not attached to a device !\n");
        LeaveCriticalSection(&ddraw_cs);
        return D3DERR_VIEWPORTHASNODEVICE;
    }
    d3d_device3 = (IDirect3DDevice3 *)&This->active_device->IDirect3DDevice3_vtbl;
    /* Need to temporarily activate viewport to clear it. Previously active one will be restored
        afterwards. */
    This->activate(This, TRUE);

    hr = IDirect3DDevice7_Clear((IDirect3DDevice7 *)This->active_device,
            dwCount, lpRects, dwFlags, dwColor, dvZ, dwStencil);
    IDirect3DDevice3_GetCurrentViewport(d3d_device3, &current_viewport);
    if(current_viewport) {
        IDirect3DViewportImpl *vp = (IDirect3DViewportImpl *)current_viewport;
        vp->activate(vp, TRUE);
        IDirect3DViewport3_Release(current_viewport);
    }
    LeaveCriticalSection(&ddraw_cs);
    return hr;
}

/*****************************************************************************
 * The VTable
 *****************************************************************************/

const IDirect3DViewport3Vtbl IDirect3DViewport3_Vtbl =
{
    /*** IUnknown Methods ***/
    IDirect3DViewportImpl_QueryInterface,
    IDirect3DViewportImpl_AddRef,
    IDirect3DViewportImpl_Release,
    /*** IDirect3DViewport Methods */
    IDirect3DViewportImpl_Initialize,
    IDirect3DViewportImpl_GetViewport,
    IDirect3DViewportImpl_SetViewport,
    IDirect3DViewportImpl_TransformVertices,
    IDirect3DViewportImpl_LightElements,
    IDirect3DViewportImpl_SetBackground,
    IDirect3DViewportImpl_GetBackground,
    IDirect3DViewportImpl_SetBackgroundDepth,
    IDirect3DViewportImpl_GetBackgroundDepth,
    IDirect3DViewportImpl_Clear,
    IDirect3DViewportImpl_AddLight,
    IDirect3DViewportImpl_DeleteLight,
    IDirect3DViewportImpl_NextLight,
    /*** IDirect3DViewport2 Methods ***/
    IDirect3DViewportImpl_GetViewport2,
    IDirect3DViewportImpl_SetViewport2,
    /*** IDirect3DViewport3 Methods ***/
    IDirect3DViewportImpl_SetBackgroundDepth2,
    IDirect3DViewportImpl_GetBackgroundDepth2,
    IDirect3DViewportImpl_Clear2,
};