在ＤＸ９中用什么函数可以查看显存？ 急 急 急．．

xwq

在ＤＸ９中用什么函数可以查看显存？可以随时查看使用过的显存量和没有被使用的显存大小？

ReallyBigBug

dx9无。
但ddraw有。你可以在创建d3d设备的时候，同时建个ddraw设备，然后查询显存情况。别无它法。

DirectDraw 7.0
IDirectDraw7::GetAvailableVidMem
The IDirectDraw7::GetAvailableVidMem method retrieves the total amount of display memory available and the amount of display memory currently free for a given type of surface.

HRESULT GetAvailableVidMem(
  LPDDSCAPS2 lpDDSCaps2,  
  LPDWORD    lpdwTotal,   
  LPDWORD    lpdwFree     
);

Parameters
lpDDSCaps2
Address of a DDSCAPS2 structure that indicates the hardware capabilities of the proposed surface.
lpdwTotal
Address of a variable to be filled with the total amount of display memory available, in bytes. The value retrieved reflects the total video memory, minus the video memory required for the primary surface and any private caches that the display driver reserves.
lpdwFree
Address of a variable to be filled with the amount of display memory currently free that can be allocated for a surface that matches the capabilities specified by the structure at lpDDSCaps2.
Return Values
If the method succeeds, the return value is DD_OK.

If it fails, the method can return one of the following error values:

DDERR_INVALIDCAPS  
DDERR_INVALIDOBJECT  
DDERR_INVALIDPARAMS  
DDERR_NODIRECTDRAWHW  


If NULL is passed to either lpdwTotal or lpdwFree, the value for that parameter is not returned.

Remarks
The following C++ example demonstrates how to use IDirectDraw7::GetAvailableVidMem to determine both the total and free display memory available for texture-map surfaces:

// For this example, the lpDD variable is a valid
// pointer to an IDirectDraw interface.
LPDIRECTDRAW7 lpDD;
DDSCAPS2      ddsCaps2;
DWORD         dwTotal;
DWORD         dwFree;
HRESULT       hr;

hr = lpDD->QueryInterface(IID_IDirectDraw7, &lpDD);
if (FAILED(hr))
    return hr;

// Initialize the structure.
ZeroMemory(&ddsCaps2, sizeof(ddsCaps2));

ddsCaps2.dwCaps = DDSCAPS_TEXTURE;
hr = lpDD->GetAvailableVidMem(&ddsCaps2, &dwTotal, &dwFree);
if (FAILED(hr))
    return hr;

If the surface has the DDSCAPS_VIDEOMEMORY flag set, this method will return different amounts of video memory depending on whether or not the surface can be used as a 3-D texture. If the surface can be used for 3-D textures, the GetAvailableVidMem method will return the sum of the local video memory and the non-local video memory on AGP systems.

This method provides only a snapshot of the current display-memory state. The amount of free display memory is subject to change as surfaces are created and released. Therefore, you should use the free memory value only as an approximation. In addition, a particular display adapter card might make no distinction between two different memory types. For example, the adapter might use the same portion of display memory to store z-buffers and textures. So, allocating one type of surface (for example, a z-buffer) can affect the amount of display memory available for another type of surface (textures). Therefore, it is best to first allocate an application's fixed resources (such as front and back buffers and z-buffers) before determining how much memory is available for dynamic use (such as texture mapping).

This method was not implemented in the IDirectDraw interface.

xwq

非常感谢楼上的，我现在遇到一个很郁闷的问题，愿楼上的给点意见，我在一个游戏的时候，通过任务管理器，发现在某个时刻我的电脑的虚拟内存（ＰＦ）急速上升４００－５００Ｍ，但进程的内存使用和虚拟内存的使用却没有什么变化，内存使用甚至会变的很小．我通过程序查看，在d3d设备释放的时候ＰＦ会突然下降几百Ｍ，我用的是ＡＴＩ的显卡．

ZombieMKII

NVPerfHub

xwq

NVPerfHub 是什么？可否说的详细点

ReallyBigBug

dx 底层会占用大量内存，特别是你创建资源时使用managed风格。如果你d3d资源未及时释放，可能会使你的进程占用大量内存。
你可以下载RivaTuner进行realtime检测。

NVPerfHud，nvidia的性能调试软件，一般需要源代码（会crack除外 ），只能在nvdia的卡上跑。

xwq

我是使用了很多managed风格的资源，但是我可以保证我所创建的资源绝对没有ＰＦ所显示的大，比如我只创建了３００Ｍ左右的资源，但ＰＦ所显示的却有８００Ｍ，只要退游戏，ＰＦ马上恢复正常

xwq

ReallyBigBug
可以加ＱＱ聊不，我的ＱＱ是３２４００９２５

PVicky

关注中，因为发现有的游戏一启动时就把显存给占光。也想知道如果获取当前显存的使用状况

ReallyBigBug

IDirectDraw        DDraw;
IDirectDraw4>        DDraw4;
DirectDrawCreate(NULL, DDraw, NULL);
DDraw->QueryInterface(IID_IDirectDraw4, DDraw4);
//
DWORD dwTotal=0;
DWORD dwFree=0;
DDSCAPS2 caps;
ZeroMemory(&caps, sizeof(caps));
FLOAT DeltaVRam=0.0f;
caps.dwCaps = DDSCAPS_VIDEOMEMORY | DDSCAPS_LOCALVIDMEM;
if(DD_OK==DDraw4->GetAvailableVidMem(&caps, &dwTotal, &dwFree))
{
FLOAT LastUsed=gUsedLocalVRam;
gTotalLocalVRam=(FLOAT)dwTotal/1048576.0f;
gUsedLocalVRam=(FLOAT)(dwTotal - dwFree)/1048576.0f;

}
//
ZeroMemory(&caps, sizeof(caps));
caps.dwCaps = DDSCAPS_VIDEOMEMORY | DDSCAPS_NONLOCALVIDMEM;
dwTotal=0;dwFree=0;
if(DD_OK==DDraw4->GetAvailableVidMem(&caps, &dwTotal, &dwFree))
{
FLOAT LastUsed=gUsedAGPRam;
gTotalAGPRam = (FLOAT)dwTotal/1048576.0f;
gUsedAGPRam  = (FLOAT)(dwTotal - dwFree) / 1048576.0f;               
}

//这是我现在工程用的部分代码，基本函数就这几个，对local显存，agp内存进行查询。