vertexbuffer.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

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static void     WINAPI IWineD3DVertexBufferImpl_PreLoad(IWineD3DVertexBuffer *iface) {
    IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *) iface;
    IWineD3DDeviceImpl *device = This->resource.wineD3DDevice;
    BYTE *data;
    UINT start = 0, end = 0, stride = 0;
    BOOL declChanged = FALSE;
    TRACE("(%p)->()\n", This);

    if(This->Flags & VBFLAG_LOAD) {
        return; /* Already doing that stuff */
    }

    if(!This->vbo) {
        /* TODO: Make converting independent from VBOs */
        return; /* Not doing any conversion */
    }

    /* Reading the declaration makes only sense if the stateblock is finalized and the buffer bound to a stream */
    if(device->isInDraw && This->bindCount > 0) {
        declChanged = IWineD3DVertexBufferImpl_FindDecl(This);
    } else if(This->Flags & VBFLAG_HASDESC) {
        /* Reuse the declaration stored in the buffer. It will most likely not change, and if it does
         * the stream source state handler will call PreLoad again and the change will be cought
         */
    } else {
        /* Cannot get a declaration, and no declaration is stored in the buffer. It is pointless to preload
         * now. When the buffer is used, PreLoad will be called by the stream source state handler and a valid
         * declaration for the buffer can be found
         */
        return;
    }

    /* If applications change the declaration over and over, reconverting all the time is a huge
     * performance hit. So count the declaration changes and release the VBO if there are too much
     * of them(and thus stop converting)
     */
    if(declChanged) {
        This->declChanges++;
        This->draws = 0;

        if(This->declChanges > VB_MAXDECLCHANGES) {
            FIXME("Too much declaration changes, stopping converting\n");
            ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
            ENTER_GL();
            GL_EXTCALL(glDeleteBuffersARB(1, &This->vbo));
            checkGLcall("glDeleteBuffersARB");
            LEAVE_GL();
            This->vbo = 0;

            /* The stream source state handler might have read the memory of the vertex buffer already
             * and got the memory in the vbo which is not valid any longer. Dirtify the stream source
             * to force a reload. This happens only once per changed vertexbuffer and should occur rather
             * rarely
             */
            IWineD3DDeviceImpl_MarkStateDirty(device, STATE_STREAMSRC);

            return;
        }
    } else {
        /* However, it is perfectly fine to change the declaration every now and then. We don't want a game that
         * changes it every minute drop the VBO after VB_MAX_DECL_CHANGES minutes. So count draws without
         * decl changes and reset the decl change count after a specific number of them
         */
        This->draws++;
        if(This->draws > VB_RESETDECLCHANGE) This->declChanges = 0;
    }

    if(declChanged) {
        /* The declaration changed, reload the whole buffer */
        WARN("Reloading buffer because of decl change\n");
        start = 0;
        end = This->resource.size;
    } else if(This->Flags & VBFLAG_DIRTY) {
        /* No decl change, but dirty data, reload the changed stuff */
        start = This->dirtystart;
        end = This->dirtyend;
    } else {
        /* Desc not changed, buffer not dirty, nothing to do :-) */
        return;
    }

    /* Mark the buffer clean */
    This->Flags &= ~VBFLAG_DIRTY;
    This->dirtystart = 0;
    This->dirtyend = 0;

    if     (This->strided.u.s.position.dwStride) stride = This->strided.u.s.position.dwStride;
    else if(This->strided.u.s.specular.dwStride) stride = This->strided.u.s.specular.dwStride;
    else if(This->strided.u.s.diffuse.dwStride)  stride = This->strided.u.s.diffuse.dwStride;
    else {
        /* That means that there is nothing to fixup. Just upload from This->resource.allocatedMemory
         * directly into the vbo. Do not free the system memory copy because drawPrimitive may need it if
         * the stride is 0, for instancing emulation, vertex blending emulation or shader emulation.
         */
        TRACE("No conversion needed, locking directly into the VBO in future\n");

        if(!device->isInDraw) {
            ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
        }
        ENTER_GL();
        GL_EXTCALL(glBindBufferARB(GL_ARRAY_BUFFER_ARB, This->vbo));
        checkGLcall("glBindBufferARB");
        GL_EXTCALL(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, start, end-start, This->resource.allocatedMemory + start));
        checkGLcall("glBufferSubDataARB");
        LEAVE_GL();
        return;
    }

    /* OK, we have the original data from the app, the description of the buffer and the dirty area.
     * so convert the stuff
     */
    data = HeapAlloc(GetProcessHeap(), 0, end-start);
    if(!data) {
        ERR("Out of memory\n");
        return;
    }
    memcpy(data, This->resource.allocatedMemory + start, end - start);

    fixup_vertices(data, data, stride, ( end - start) / stride,
                   /* Position */
                   (int)This->strided.u.s.position.lpData, /* Data location */
                   This->strided.u.s.position_transformed, /* Do convert? */
                   /* Diffuse color */
                   (int)This->strided.u.s.diffuse.lpData, /* Location */
                   This->strided.u.s.diffuse.dwType == WINED3DDECLTYPE_SHORT4 || This->strided.u.s.diffuse.dwType == WINED3DDECLTYPE_D3DCOLOR, /* Convert? */
                   /* specular color */
                   (int)This->strided.u.s.specular.lpData, /* location */
                   This->strided.u.s.specular.dwType == WINED3DDECLTYPE_SHORT4 || This->strided.u.s.specular.dwType == WINED3DDECLTYPE_D3DCOLOR);

    if(!device->isInDraw) {
        ActivateContext(device, device->lastActiveRenderTarget, CTXUSAGE_RESOURCELOAD);
    }
    ENTER_GL();
    GL_EXTCALL(glBindBufferARB(GL_ARRAY_BUFFER_ARB, This->vbo));
    checkGLcall("glBindBufferARB");
    GL_EXTCALL(glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, start, end - start, data));
    checkGLcall("glBufferSubDataARB");
    LEAVE_GL();

    HeapFree(GetProcessHeap(), 0, data);
}

static WINED3DRESOURCETYPE WINAPI IWineD3DVertexBufferImpl_GetType(IWineD3DVertexBuffer *iface) {
    return IWineD3DResourceImpl_GetType((IWineD3DResource *)iface);
}

static HRESULT WINAPI IWineD3DVertexBufferImpl_GetParent(IWineD3DVertexBuffer *iface, IUnknown **pParent) {
    return IWineD3DResourceImpl_GetParent((IWineD3DResource *)iface, pParent);
}

/* ******************************************************
   IWineD3DVertexBuffer IWineD3DVertexBuffer parts follow
   ****************************************************** */
static HRESULT  WINAPI IWineD3DVertexBufferImpl_Lock(IWineD3DVertexBuffer *iface, UINT OffsetToLock, UINT SizeToLock, BYTE** ppbData, DWORD Flags) {
    IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;
    BYTE *data;
    TRACE("(%p)->%d, %d, %p, %08x\n", This, OffsetToLock, SizeToLock, ppbData, Flags);

    InterlockedIncrement(&This->lockcount);

    if(This->Flags & VBFLAG_DIRTY) {
        if(This->dirtystart > OffsetToLock) This->dirtystart = OffsetToLock;
        if(SizeToLock) {
            if(This->dirtyend < OffsetToLock + SizeToLock) This->dirtyend = OffsetToLock + SizeToLock;
        } else {
            This->dirtyend = This->resource.size;
        }
    } else {
        This->dirtystart = OffsetToLock;
        if(SizeToLock)
            This->dirtyend = OffsetToLock + SizeToLock;
        else
            This->dirtyend = This->resource.size;
    }

    data = This->resource.allocatedMemory;
    This->Flags |= VBFLAG_DIRTY;
    *ppbData = data + OffsetToLock;

    TRACE("(%p) : returning memory of %p (base:%p,offset:%u)\n", This, data + OffsetToLock, data, OffsetToLock);
    /* TODO: check Flags compatibility with This->currentDesc.Usage (see MSDN) */
    return WINED3D_OK;
}
HRESULT  WINAPI IWineD3DVertexBufferImpl_Unlock(IWineD3DVertexBuffer *iface) {
    IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *) iface;
    LONG lockcount;
    TRACE("(%p)\n", This);

    lockcount = InterlockedDecrement(&This->lockcount);
    if(lockcount > 0) {
        /* Delay loading the buffer until everything is unlocked */
        TRACE("Ignoring the unlock\n");
        return WINED3D_OK;
    }

    if(This->Flags & VBFLAG_HASDESC) {
        IWineD3DVertexBufferImpl_PreLoad(iface);
    }
    return WINED3D_OK;
}
static HRESULT  WINAPI IWineD3DVertexBufferImpl_GetDesc(IWineD3DVertexBuffer *iface, WINED3DVERTEXBUFFER_DESC *pDesc) {
    IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;

    TRACE("(%p)\n", This);
    pDesc->Format = This->resource.format;
    pDesc->Type   = This->resource.resourceType;
    pDesc->Usage  = This->resource.usage;
    pDesc->Pool   = This->resource.pool;
    pDesc->Size   = This->resource.size;
    pDesc->FVF    = This->fvf;
    return WINED3D_OK;
}

const IWineD3DVertexBufferVtbl IWineD3DVertexBuffer_Vtbl =
{
    /* IUnknown */
    IWineD3DVertexBufferImpl_QueryInterface,
    IWineD3DVertexBufferImpl_AddRef,
    IWineD3DVertexBufferImpl_Release,
    /* IWineD3DResource */
    IWineD3DVertexBufferImpl_GetParent,
    IWineD3DVertexBufferImpl_GetDevice,
    IWineD3DVertexBufferImpl_SetPrivateData,
    IWineD3DVertexBufferImpl_GetPrivateData,
    IWineD3DVertexBufferImpl_FreePrivateData,
    IWineD3DVertexBufferImpl_SetPriority,
    IWineD3DVertexBufferImpl_GetPriority,
    IWineD3DVertexBufferImpl_PreLoad,
    IWineD3DVertexBufferImpl_GetType,
    /* IWineD3DVertexBuffer */
    IWineD3DVertexBufferImpl_Lock,
    IWineD3DVertexBufferImpl_Unlock,
    IWineD3DVertexBufferImpl_GetDesc
};

BYTE* WINAPI IWineD3DVertexBufferImpl_GetMemory(IWineD3DVertexBuffer* iface, DWORD iOffset, GLint *vbo) {
    IWineD3DVertexBufferImpl *This = (IWineD3DVertexBufferImpl *)iface;

    *vbo = This->vbo;
    if(This->vbo == 0) {
        return This->resource.allocatedMemory + iOffset;
    } else {
        return (BYTE *) iOffset;
    }
}

HRESULT WINAPI IWineD3DVertexBufferImpl_ReleaseMemory(IWineD3DVertexBuffer* iface) {
  return WINED3D_OK;
}