dlls/wined3d/vertexbuffer.c

   1 /*
   2  * IWineD3DVertexBuffer Implementation
   3  *
   4  * Copyright 2002-2005 Jason Edmeades
   5  *                     Raphael Junqueira
   6  * Copyright 2004 Christian Costa
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wined3d_private.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(d3d);
  27 #define GLINFO_LOCATION This->resource.wineD3DDevice->adapter->gl_info
  28
  29 #define VB_MAXDECLCHANGES     100     /* After that number we stop converting */
  30 #define VB_RESETDECLCHANGE    1000    /* Reset the changecount after that number of draws */
  31
  32 /* *******************************************
  33    IWineD3DVertexBuffer IUnknown parts follow
  34    ******************************************* */
  35 static HRESULT WINAPI IWineD3DVertexBufferImpl_QueryInterface(IWineD3DVertexBuffer *iface, REFIID riid, LPVOID *ppobj)
  36 {
  37     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
  38     TRACE("(%p)->(%s,%p)\n",This,debugstr_guid(riid),ppobj);
  39     if (IsEqualGUID(riid, &IID_IUnknown)
  40         || IsEqualGUID(riid, &IID_IWineD3DBase)
  41         || IsEqualGUID(riid, &IID_IWineD3DResource)
  42         || IsEqualGUID(riid, &IID_IWineD3DVertexBuffer)){
  43         IUnknown_AddRef(iface);
  44         *ppobj = This;
  45         return S_OK;
  46     }
  47     *ppobj = NULL;
  48     return E_NOINTERFACE;
  49 }
  50
  51 static ULONG WINAPI IWineD3DVertexBufferImpl_AddRef(IWineD3DVertexBuffer *iface) {
  52     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
  53     ULONG ref = InterlockedIncrement(&This->resource.ref);
  54     TRACE("(%p) : AddRef increasing from %d\n", This, ref - 1);
  55     return ref;
  56 }
  57
  58 static ULONG WINAPI IWineD3DVertexBufferImpl_Release(IWineD3DVertexBuffer *iface) {
  59     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
  60     ULONG ref = InterlockedDecrement(&This->resource.ref);
  61     TRACE("(%p) : Releasing from %d\n", This, ref + 1);
  62     if (ref == 0) {
  63
  64         if(This->vbo) {
  65             IWineD3DDeviceImpl *device = This->resource.wineD3DDevice;
  66
  67             ENTER_GL();
  68             ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
  69             GL_EXTCALL(glDeleteBuffersARB(1, &This->vbo));
  70             checkGLcall("glDeleteBuffersARB");
  71             LEAVE_GL();
  72         }
  73
  74         IWineD3DResourceImpl_CleanUp((IWineD3DResource *)iface);
  75         HeapFree(GetProcessHeap(), 0, This);
  76     }
  77     return ref;
  78 }
  79
  80 /* ****************************************************
  81    IWineD3DVertexBuffer IWineD3DResource parts follow
  82    **************************************************** */
  83 static HRESULT WINAPI IWineD3DVertexBufferImpl_GetDevice(IWineD3DVertexBuffer *iface, IWineD3DDevice** ppDevice) {
  84     return IWineD3DResourceImpl_GetDevice((IWineD3DResource *)iface, ppDevice);
  85 }
  86
  87 static HRESULT WINAPI IWineD3DVertexBufferImpl_SetPrivateData(IWineD3DVertexBuffer *iface, REFGUID refguid, CONST void* pData, DWORD SizeOfData, DWORD Flags) {
  88     return IWineD3DResourceImpl_SetPrivateData((IWineD3DResource *)iface, refguid, pData, SizeOfData, Flags);
  89 }
  90
  91 static HRESULT WINAPI IWineD3DVertexBufferImpl_GetPrivateData(IWineD3DVertexBuffer *iface, REFGUID refguid, void* pData, DWORD* pSizeOfData) {
  92     return IWineD3DResourceImpl_GetPrivateData((IWineD3DResource *)iface, refguid, pData, pSizeOfData);
  93 }
  94
  95 static HRESULT WINAPI IWineD3DVertexBufferImpl_FreePrivateData(IWineD3DVertexBuffer *iface, REFGUID refguid) {
  96     return IWineD3DResourceImpl_FreePrivateData((IWineD3DResource *)iface, refguid);
  97 }
  98
  99 static DWORD    WINAPI IWineD3DVertexBufferImpl_SetPriority(IWineD3DVertexBuffer *iface, DWORD PriorityNew) {
 100     return IWineD3DResourceImpl_SetPriority((IWineD3DResource *)iface, PriorityNew);
 101 }
 102
 103 static DWORD    WINAPI IWineD3DVertexBufferImpl_GetPriority(IWineD3DVertexBuffer *iface) {
 104     return IWineD3DResourceImpl_GetPriority((IWineD3DResource *)iface);
 105 }
 106
 107 static void fixup_vertices(BYTE *src, BYTE *dst, int stride, int num, BYTE *pos, BOOL haspos, BYTE *diffuse, BOOL hasdiffuse, BYTE *specular, BOOL hasspecular) {
 108     int i;
 109     float x, y, z, w;
 110
 111     for(i = num - 1; i >= 0; i--) {
 112         if(haspos) {
 113             float *p = (float *) (((int) src + (int) pos) + i * stride);
 114
 115             /* rhw conversion like in drawStridedSlow */
 116             if(p[3] == 1.0 || ((p[3] < eps) && (p[3] > -eps))) {
 117                 x = p[0];
 118                 y = p[1];
 119                 z = p[2];
 120                 w = 1.0;
 121             } else {
 122                 w = 1.0 / p[3];
 123                 x = p[0] * w;
 124                 y = p[1] * w;
 125                 z = p[2] * w;
 126             }
 127             p = (float *) ((int) dst + i * stride + (int) pos);
 128             p[0] = x;
 129             p[1] = y;
 130             p[2] = z;
 131             p[3] = w;
 132         }
 133         if(hasdiffuse) {
 134             DWORD srcColor, *dstColor = (DWORD *) (dst + i * stride + (int) diffuse);
 135             srcColor = * (DWORD *) ( ((int) src + (int) diffuse) + i * stride);
 136
 137             /* Color conversion like in drawStridedSlow. watch out for little endianity
 138             * If we want that stuff to work on big endian machines too we have to consider more things
 139             *
 140             * 0xff000000: Alpha mask
 141             * 0x00ff0000: Blue mask
 142             * 0x0000ff00: Green mask
 143             * 0x000000ff: Red mask
 144             */
 145
 146             *dstColor = 0;
 147             *dstColor |= (srcColor & 0xff00ff00)      ;   /* Alpha Green */
 148             *dstColor |= (srcColor & 0x00ff0000) >> 16;   /* Red */
 149             *dstColor |= (srcColor & 0x000000ff) << 16;   /* Blue */
 150         }
 151         if(hasspecular) {
 152             DWORD srcColor, *dstColor = (DWORD *) (dst + i * stride + (int) specular);
 153             srcColor = * (DWORD *) ( ((int) src + (int) specular) + i * stride);
 154
 155             /* Similar to diffuse
 156              * TODO: Write the alpha value out for fog coords
 157              */
 158             *dstColor = 0;
 159             *dstColor |= (srcColor & 0xff00ff00)      ;   /* Alpha Green */
 160             *dstColor |= (srcColor & 0x00ff0000) >> 16;   /* Red */
 161             *dstColor |= (srcColor & 0x000000ff) << 16;   /* Blue */
 162         }
 163     }
 164 }
 165
 166 inline BOOL WINAPI IWineD3DVertexBufferImpl_FindDecl(IWineD3DVertexBufferImpl *This)
 167 {
 168     WineDirect3DVertexStridedData strided;
 169     IWineD3DDeviceImpl *device = This->resource.wineD3DDevice;
 170
 171     /* In d3d7 the vertex buffer declaration NEVER changes because it is stored in the d3d7 vertex buffer.
 172      * Once we have our declaration there is no need to look it up again.
 173      */
 174     if(((IWineD3DImpl *)device->wineD3D)->dxVersion == 7 && This->Flags & VBFLAG_HASDESC) {
 175         return FALSE;
 176     }
 177
 178     /* There are certain vertex data types that need to be fixed up. The Vertex Buffers FVF doesn't
 179      * help finding them, only the vertex declaration or the device FVF can determine that at drawPrim
 180      * time. Rules are as follows:
 181      *
 182      * -> No modification when Vertex Shaders are used
 183      * -> Fix up position1 and position 2 if they are XYZRHW
 184      * -> Fix up diffuse color
 185      * -> Fix up specular color
 186      *
 187      * The Declaration is only known at drawing time, and it can change from draw to draw. If any converted values
 188      * are changed, the whole buffer has to be reconverted and reloaded. (Converting is SLOW, so if this happens too
 189      * often PreLoad stops converting entirely and falls back to drawStridedSlow).
 190      *
 191      * Reconvert if:
 192      * -> New semantics that have to be converted appear
 193      * -> The position of semantics that have to be converted changes
 194      * -> The stride of the vertex changed AND there is stuff that needs conversion
 195      * -> (If a vertex shader is bound and in use assume that nothing that needs conversion is there)
 196      *
 197      * Return values:
 198      *  TRUE: Reload is needed
 199      *  FALSE: otherwise
 200      */
 201
 202     if (use_vs(device)) {
 203         /* Assume no conversion */
 204         memset(&strided, 0, sizeof(strided));
 205     } else {
 206         /* we need a copy because we modify some params */
 207         memcpy(&strided, &device->strided_streams, sizeof(strided));
 208
 209         /* Filter out data that does not come from this VBO */
 210         if(strided.u.s.position.VBO != This->vbo)    memset(&strided.u.s.position, 0, sizeof(strided.u.s.position));
 211         if(strided.u.s.diffuse.VBO != This->vbo)     memset(&strided.u.s.diffuse, 0, sizeof(strided.u.s.diffuse));
 212         if(strided.u.s.specular.VBO != This->vbo)    memset(&strided.u.s.specular, 0, sizeof(strided.u.s.specular));
 213         if(strided.u.s.position2.VBO != This->vbo)   memset(&strided.u.s.position2, 0, sizeof(strided.u.s.position2));
 214     }
 215
 216     /* We have a declaration now in the buffer */
 217     This->Flags |= VBFLAG_HASDESC;
 218
 219     /* Find out if reload is needed
 220      * Position of the semantic in the vertex and the stride must be equal to the stored type. Don't mind if only unconverted stuff changed.
 221      *
 222      * If some stuff does not exist in the buffer, then lpData, dwStride and dwType are memsetted to 0. So if the semantic didn't exist before
 223      * and does not exist now all 3 values will be equal(=0).
 224      *
 225      * Checking the lpData field alone is not enough, because data may appear at offset 0 in the buffer. This is the same location as nonexistent
 226      * data uses, so we have to check the type and stride too. Colors can be at offset 0 too, because it is perfectly fine to render from 2 or more
 227      * buffers at the same time and get the position from one and the color from the other buffer.
 228      */
 229     if( /* Position transformed vs untransformed */
 230         ((This->strided.u.s.position_transformed || strided.u.s.position_transformed) &&
 231           This->strided.u.s.position.lpData != strided.u.s.position.lpData) ||
 232         /* Diffuse position and data type */
 233         This->strided.u.s.diffuse.lpData != strided.u.s.diffuse.lpData || This->strided.u.s.diffuse.dwStride != strided.u.s.diffuse.dwStride ||
 234          This->strided.u.s.diffuse.dwType != strided.u.s.diffuse.dwType ||
 235         /* Specular position and data type */
 236         This->strided.u.s.specular.lpData != strided.u.s.specular.lpData || This->strided.u.s.specular.dwStride != strided.u.s.specular.dwStride ||
 237          This->strided.u.s.specular.dwType != strided.u.s.specular.dwType) {
 238
 239         TRACE("Declaration changed, reloading buffer\n");
 240         /* Set the new description */
 241         memcpy(&This->strided, &strided, sizeof(strided));
 242         return TRUE;
 243     }
 244
 245     return FALSE;
 246 }
 247
 248 static void     WINAPI IWineD3DVertexBufferImpl_PreLoad(IWineD3DVertexBuffer *iface) {
 249     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *) iface;
 250     IWineD3DDeviceImpl *device = This->resource.wineD3DDevice;
 251     BYTE *data;
 252     UINT start = 0, end = 0, stride = 0;
 253     BOOL declChanged = FALSE;
 254     TRACE("(%p)->()\n", This);
 255
 256     if(This->Flags & VBFLAG_LOAD) {
 257         return; /* Already doing that stuff */
 258     }
 259
 260     if(!This->vbo) {
 261         /* TODO: Make converting independent from VBOs */
 262         return; /* Not doing any conversion */
 263     }
 264
 265     /* Reading the declaration makes only sense if the stateblock is finalized and the buffer bound to a stream */
 266     if(device->isInDraw && This->bindCount > 0) {
 267         declChanged = IWineD3DVertexBufferImpl_FindDecl(This);
 268     } else if(This->Flags & VBFLAG_HASDESC) {
 269         /* Reuse the declaration stored in the buffer. It will most likely not change, and if it does
 270          * the stream source state handler will call PreLoad again and the change will be cought
 271          */
 272     } else {
 273         /* Cannot get a declaration, and no declaration is stored in the buffer. It is pointless to preload
 274          * now. When the buffer is used, PreLoad will be called by the stream source state handler and a valid
 275          * declaration for the buffer can be found
 276          */
 277         return;
 278     }
 279
 280     /* If applications change the declaration over and over, reconverting all the time is a huge
 281      * performance hit. So count the declaration changes and release the VBO if there are too much
 282      * of them(and thus stop converting)
 283      */
 284     if(declChanged) {
 285         This->declChanges++;
 286         This->draws = 0;
 287
 288         if(This->declChanges > VB_MAXDECLCHANGES) {
 289             FIXME("Too much declaration changes, stopping converting\n");
 290             ENTER_GL();
 291             ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
 292             GL_EXTCALL(glDeleteBuffersARB(1, &This->vbo));
 293             checkGLcall("glDeleteBuffersARB");
 294             LEAVE_GL();
 295             This->vbo = 0;
 296
 297             /* The stream source state handler might have read the memory of the vertex buffer already
 298              * and got the memory in the vbo which is not valid any longer. Dirtify the stream source
 299              * to force a reload. This happens only once per changed vertexbuffer and should occur rather
 300              * rarely
 301              */
 302             IWineD3DDeviceImpl_MarkStateDirty(device, STATE_STREAMSRC);
 303
 304             return;
 305         }
 306     } else {
 307         /* However, it is perfectly fine to change the declaration every now and then. We don't want a game that
 308          * changes it every minute drop the VBO after VB_MAX_DECL_CHANGES minutes. So count draws without
 309          * decl changes and reset the decl change count after a specific number of them
 310          */
 311         This->draws++;
 312         if(This->draws > VB_RESETDECLCHANGE) This->declChanges = 0;
 313     }
 314
 315     if(declChanged) {
 316         /* The declaration changed, reload the whole buffer */
 317         WARN("Reloading buffer because of decl change\n");
 318         start = 0;
 319         end = This->resource.size;
 320     } else if(This->Flags & VBFLAG_DIRTY) {
 321         /* No decl change, but dirty data, reload the changed stuff */
 322         start = This->dirtystart;
 323         end = This->dirtyend;
 324     } else {
 325         /* Desc not changed, buffer not dirty, nothing to do :-) */
 326         return;
 327     }
 328
 329     /* Mark the buffer clean */
 330     This->Flags &= ~VBFLAG_DIRTY;
 331     This->dirtystart = 0;
 332     This->dirtyend = 0;
 333
 334     if     (This->strided.u.s.position.dwStride) stride = This->strided.u.s.position.dwStride;
 335     else if(This->strided.u.s.specular.dwStride) stride = This->strided.u.s.specular.dwStride;
 336     else if(This->strided.u.s.diffuse.dwStride)  stride = This->strided.u.s.diffuse.dwStride;
 337     else {
 338         /* That means that there is nothing to fixup. Just upload from This->resource.allocatedMemory
 339          * directly into the vbo. Do not free the system memory copy because drawPrimitive may need it if
 340          * the stride is 0, for instancing emulation, vertex blending emulation or shader emulation.
 341          */
 342         TRACE("No conversion needed, locking directly into the VBO in future\n");
 343
 344         ENTER_GL();
 345         if(!device->isInDraw) {
 346             ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
 347         }
 348         GL_EXTCALL(glBindBufferARB(GL_ARRAY_BUFFER_ARB, This->vbo));
 349         checkGLcall("glBindBufferARB");
 350         GL_EXTCALL(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, start, end-start, This->resource.allocatedMemory + start));
 351         checkGLcall("glBufferSubDataARB");
 352         LEAVE_GL();
 353         return;
 354     }
 355
 356     /* OK, we have the original data from the app, the description of the buffer and the dirty area.
 357      * so convert the stuff
 358      */
 359     data = HeapAlloc(GetProcessHeap(), 0, end-start);
 360     if(!data) {
 361         ERR("Out of memory\n");
 362         return;
 363     }
 364     memcpy(data, This->resource.allocatedMemory + start, end - start);
 365
 366     fixup_vertices(data, data, stride, ( end - start) / stride,
 367                    /* Position */
 368                    This->strided.u.s.position.lpData, /* Data location */
 369                    This->strided.u.s.position_transformed, /* Do convert? */
 370                    /* Diffuse color */
 371                    This->strided.u.s.diffuse.lpData, /* Location */
 372                    This->strided.u.s.diffuse.dwType == WINED3DDECLTYPE_SHORT4 || This->strided.u.s.diffuse.dwType == WINED3DDECLTYPE_D3DCOLOR, /* Convert? */
 373                    /* specular color */
 374                    This->strided.u.s.specular.lpData, /* location */
 375                    This->strided.u.s.specular.dwType == WINED3DDECLTYPE_SHORT4 || This->strided.u.s.specular.dwType == WINED3DDECLTYPE_D3DCOLOR);
 376
 377     ENTER_GL();
 378     if(!device->isInDraw) {
 379         ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
 380     }
 381     GL_EXTCALL(glBindBufferARB(GL_ARRAY_BUFFER_ARB, This->vbo));
 382     checkGLcall("glBindBufferARB");
 383     GL_EXTCALL(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, start, end - start, data));
 384     checkGLcall("glBufferSubDataARB");
 385     LEAVE_GL();
 386
 387     HeapFree(GetProcessHeap(), 0, data);
 388 }
 389
 390 static WINED3DRESOURCETYPE WINAPI IWineD3DVertexBufferImpl_GetType(IWineD3DVertexBuffer *iface) {
 391     return IWineD3DResourceImpl_GetType((IWineD3DResource *)iface);
 392 }
 393
 394 static HRESULT WINAPI IWineD3DVertexBufferImpl_GetParent(IWineD3DVertexBuffer *iface, IUnknown **pParent) {
 395     return IWineD3DResourceImpl_GetParent((IWineD3DResource *)iface, pParent);
 396 }
 397
 398 /* ******************************************************
 399    IWineD3DVertexBuffer IWineD3DVertexBuffer parts follow
 400    ****************************************************** */
 401 static HRESULT  WINAPI IWineD3DVertexBufferImpl_Lock(IWineD3DVertexBuffer *iface, UINT OffsetToLock, UINT SizeToLock, BYTE** ppbData, DWORD Flags) {
 402     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
 403     BYTE *data;
 404     TRACE("(%p)->%d, %d, %p, %08x\n", This, OffsetToLock, SizeToLock, ppbData, Flags);
 405
 406     InterlockedIncrement(&This->lockcount);
 407
 408     if(This->Flags & VBFLAG_DIRTY) {
 409         if(This->dirtystart > OffsetToLock) This->dirtystart = OffsetToLock;
 410         if(SizeToLock) {
 411             if(This->dirtyend < OffsetToLock + SizeToLock) This->dirtyend = OffsetToLock + SizeToLock;
 412         } else {
 413             This->dirtyend = This->resource.size;
 414         }
 415     } else {
 416         This->dirtystart = OffsetToLock;
 417         if(SizeToLock)
 418             This->dirtyend = OffsetToLock + SizeToLock;
 419         else
 420             This->dirtyend = This->resource.size;
 421     }
 422
 423     data = This->resource.allocatedMemory;
 424     This->Flags |= VBFLAG_DIRTY;
 425     *ppbData = data + OffsetToLock;
 426
 427     TRACE("(%p) : returning memory of %p (base:%p,offset:%u)\n", This, data + OffsetToLock, data, OffsetToLock);
 428     /* TODO: check Flags compatibility with This->currentDesc.Usage (see MSDN) */
 429     return WINED3D_OK;
 430 }
 431 HRESULT  WINAPI IWineD3DVertexBufferImpl_Unlock(IWineD3DVertexBuffer *iface) {
 432     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *) iface;
 433     LONG lockcount;
 434     TRACE("(%p)\n", This);
 435
 436     lockcount = InterlockedDecrement(&This->lockcount);
 437     if(lockcount > 0) {
 438         /* Delay loading the buffer until everything is unlocked */
 439         TRACE("Ignoring the unlock\n");
 440         return WINED3D_OK;
 441     }
 442
 443     if(This->Flags & VBFLAG_HASDESC) {
 444         IWineD3DVertexBufferImpl_PreLoad(iface);
 445     }
 446     return WINED3D_OK;
 447 }
 448 static HRESULT  WINAPI IWineD3DVertexBufferImpl_GetDesc(IWineD3DVertexBuffer *iface, WINED3DVERTEXBUFFER_DESC *pDesc) {
 449     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
 450
 451     TRACE("(%p)\n", This);
 452     pDesc->Format = This->resource.format;
 453     pDesc->Type   = This->resource.resourceType;
 454     pDesc->Usage  = This->resource.usage;
 455     pDesc->Pool   = This->resource.pool;
 456     pDesc->Size   = This->resource.size;
 457     pDesc->FVF    = This->fvf;
 458     return WINED3D_OK;
 459 }
 460
 461 const IWineD3DVertexBufferVtbl IWineD3DVertexBuffer_Vtbl =
 462 {
 463     /* IUnknown */
 464     IWineD3DVertexBufferImpl_QueryInterface,
 465     IWineD3DVertexBufferImpl_AddRef,
 466     IWineD3DVertexBufferImpl_Release,
 467     /* IWineD3DResource */
 468     IWineD3DVertexBufferImpl_GetParent,
 469     IWineD3DVertexBufferImpl_GetDevice,
 470     IWineD3DVertexBufferImpl_SetPrivateData,
 471     IWineD3DVertexBufferImpl_GetPrivateData,
 472     IWineD3DVertexBufferImpl_FreePrivateData,
 473     IWineD3DVertexBufferImpl_SetPriority,
 474     IWineD3DVertexBufferImpl_GetPriority,
 475     IWineD3DVertexBufferImpl_PreLoad,
 476     IWineD3DVertexBufferImpl_GetType,
 477     /* IWineD3DVertexBuffer */
 478     IWineD3DVertexBufferImpl_Lock,
 479     IWineD3DVertexBufferImpl_Unlock,
 480     IWineD3DVertexBufferImpl_GetDesc
 481 };
 482
 483 BYTE* WINAPI IWineD3DVertexBufferImpl_GetMemory(IWineD3DVertexBuffer* iface, DWORD iOffset, GLint *vbo) {
 484     IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
 485
 486     *vbo = This->vbo;
 487     if(This->vbo == 0) {
 488         return This->resource.allocatedMemory + iOffset;
 489     } else {
 490         return (BYTE *) iOffset;
 491     }
 492 }
 493
 494 HRESULT WINAPI IWineD3DVertexBufferImpl_ReleaseMemory(IWineD3DVertexBuffer* iface) {
 495   return WINED3D_OK;
 496 }