/*
 * vertex declaration implementation
 *
 * Copyright 2002-2005 Raphael Junqueira
 * Copyright 2004 Jason Edmeades
 * Copyright 2004 Christian Costa
 * Copyright 2005 Oliver Stieber
 *
 * 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 "wined3d_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(d3d_decl);

static void dump_wined3dvertexelement(const WINED3DVERTEXELEMENT *element) {
    TRACE("     Stream: %d\n", element->Stream);
    TRACE("     Offset: %d\n", element->Offset);
    TRACE("       Type: %s (%#x)\n", debug_d3ddecltype(element->Type), element->Type);
    TRACE("     Method: %s (%#x)\n", debug_d3ddeclmethod(element->Method), element->Method);
    TRACE("      Usage: %s (%#x)\n", debug_d3ddeclusage(element->Usage), element->Usage);
    TRACE("Usage index: %d\n", element->UsageIndex);
    TRACE("   Register: %d\n", element->Reg);
}

/* *******************************************
   IWineD3DVertexDeclaration IUnknown parts follow
   ******************************************* */
static HRESULT WINAPI IWineD3DVertexDeclarationImpl_QueryInterface(IWineD3DVertexDeclaration *iface, REFIID riid, LPVOID *ppobj)
{
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    TRACE("(%p)->(%s,%p)\n",This,debugstr_guid(riid),ppobj);
    if (IsEqualGUID(riid, &IID_IUnknown)
        || IsEqualGUID(riid, &IID_IWineD3DBase)
        || IsEqualGUID(riid, &IID_IWineD3DVertexDeclaration)){
        IUnknown_AddRef(iface);
        *ppobj = This;
        return S_OK;
    }
    *ppobj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI IWineD3DVertexDeclarationImpl_AddRef(IWineD3DVertexDeclaration *iface) {
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    TRACE("(%p) : AddRef increasing from %d\n", This, This->ref);
    return InterlockedIncrement(&This->ref);
}

static ULONG WINAPI IWineD3DVertexDeclarationImpl_Release(IWineD3DVertexDeclaration *iface) {
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    ULONG ref;
    TRACE("(%p) : Releasing from %d\n", This, This->ref);
    ref = InterlockedDecrement(&This->ref);
    if (ref == 0) {
        if(iface == This->wineD3DDevice->stateBlock->vertexDecl) {
            /* See comment in PixelShader::Release */
            IWineD3DDeviceImpl_MarkStateDirty(This->wineD3DDevice, STATE_VDECL);
        }

        HeapFree(GetProcessHeap(), 0, This->pDeclarationWine);
        HeapFree(GetProcessHeap(), 0, This);
    }
    return ref;
}

/* *******************************************
   IWineD3DVertexDeclaration parts follow
   ******************************************* */

static HRESULT WINAPI IWineD3DVertexDeclarationImpl_GetParent(IWineD3DVertexDeclaration *iface, IUnknown** parent){
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;

    *parent= This->parent;
    IUnknown_AddRef(*parent);
    TRACE("(%p) : returning %p\n", This, *parent);
    return WINED3D_OK;
}

static HRESULT WINAPI IWineD3DVertexDeclarationImpl_GetDevice(IWineD3DVertexDeclaration *iface, IWineD3DDevice** ppDevice) {
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    TRACE("(%p) : returning %p\n", This, This->wineD3DDevice);

    *ppDevice = (IWineD3DDevice *) This->wineD3DDevice;
    IWineD3DDevice_AddRef(*ppDevice);

    return WINED3D_OK;
}

static HRESULT WINAPI IWineD3DVertexDeclarationImpl_GetDeclaration(IWineD3DVertexDeclaration *iface,
        WINED3DVERTEXELEMENT *elements, size_t *element_count) {
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    HRESULT hr = WINED3D_OK;

    TRACE("(%p) : d3d version %d, elements %p, element_count %p\n",
            This, ((IWineD3DImpl *)This->wineD3DDevice->wineD3D)->dxVersion, elements, element_count);

    *element_count = This->declarationWNumElements;
    if (elements) {
        CopyMemory(elements, This->pDeclarationWine, This->declarationWNumElements * sizeof(WINED3DVERTEXELEMENT));
    }

    return hr;
}

static HRESULT WINAPI IWineD3DVertexDeclarationImpl_SetDeclaration(IWineD3DVertexDeclaration *iface,
        const WINED3DVERTEXELEMENT *elements, size_t element_count) {
    IWineD3DVertexDeclarationImpl *This = (IWineD3DVertexDeclarationImpl *)iface;
    HRESULT hr = WINED3D_OK;
    int i, j;
    char isPreLoaded[MAX_STREAMS];

    TRACE("(%p) : d3d version %d\n", This, ((IWineD3DImpl *)This->wineD3DDevice->wineD3D)->dxVersion);
    memset(isPreLoaded, 0, sizeof(isPreLoaded));

    if (TRACE_ON(d3d_decl)) {
        for (i = 0; i < element_count; ++i) {
            dump_wined3dvertexelement(elements+i);
        }
    }

    This->declarationWNumElements = element_count;
    This->pDeclarationWine = HeapAlloc(GetProcessHeap(), 0, sizeof(WINED3DVERTEXELEMENT) * element_count);
    if (!This->pDeclarationWine) {
        ERR("Memory allocation failed\n");
        return WINED3DERR_OUTOFVIDEOMEMORY;
    } else {
        CopyMemory(This->pDeclarationWine, elements, sizeof(WINED3DVERTEXELEMENT) * element_count);
    }

    /* Do some static analysis on the elements to make reading the declaration more comfortable
     * for the drawing code
     */
    This->num_streams = 0;
    This->position_transformed = FALSE;
    for (i = 0; i < element_count; ++i) {

        if(This->pDeclarationWine[i].Usage == WINED3DDECLUSAGE_POSITIONT) {
            This->position_transformed = TRUE;
        }

        /* Find the Streams used in the declaration. The vertex buffers have to be loaded
         * when drawing, but filter tesselation pseudo streams
         */
        if(This->pDeclarationWine[i].Stream >= MAX_STREAMS) continue;

        if(!isPreLoaded[This->pDeclarationWine[i].Stream]) {
            This->streams[This->num_streams] = This->pDeclarationWine[i].Stream;
            This->num_streams++;
            isPreLoaded[This->pDeclarationWine[i].Stream] = 1;
        }

        /* Create a sorted array containing the attribute declarations that are of type
         * D3DCOLOR. D3DCOLOR requires swizzling of the r and b component, and if the
         * declaration of one attribute changes the vertex shader needs recompilation.
         * Having a sorted array of the attributes allows efficient comparison of the
         * declaration against a shader
         */
        if(This->pDeclarationWine[i].Type == WINED3DDECLTYPE_D3DCOLOR) {
            for(j = 0; j < This->num_swizzled_attribs; j++) {
                if(This->swizzled_attribs[j].usage >  This->pDeclarationWine[i].Usage ||
                  (This->swizzled_attribs[j].usage == This->pDeclarationWine[i].Usage &&
                   This->swizzled_attribs[j].idx   >   This->pDeclarationWine[i].UsageIndex)) {
                    memmove(&This->swizzled_attribs[j + 1], &This->swizzled_attribs[j],
                             sizeof(This->swizzled_attribs) - (sizeof(This->swizzled_attribs[0]) * (j + 1)));
                    break;
                }
            }

            This->swizzled_attribs[j].usage = This->pDeclarationWine[i].Usage;
            This->swizzled_attribs[j].idx = This->pDeclarationWine[i].UsageIndex;
            This->num_swizzled_attribs++;
        }
    }

    TRACE("Swizzled attributes found:\n");
    for(i = 0; i < This->num_swizzled_attribs; i++) {
        TRACE("%u: %s%d\n", i,
              debug_d3ddeclusage(This->swizzled_attribs[i].usage), This->swizzled_attribs[i].idx);
    }
    TRACE("Returning\n");
    return hr;
}

const IWineD3DVertexDeclarationVtbl IWineD3DVertexDeclaration_Vtbl =
{
    /* IUnknown */
    IWineD3DVertexDeclarationImpl_QueryInterface,
    IWineD3DVertexDeclarationImpl_AddRef,
    IWineD3DVertexDeclarationImpl_Release,
    /* IWineD3DVertexDeclaration */
    IWineD3DVertexDeclarationImpl_GetParent,
    IWineD3DVertexDeclarationImpl_GetDevice,
    IWineD3DVertexDeclarationImpl_GetDeclaration,
    IWineD3DVertexDeclarationImpl_SetDeclaration
};