Direct3D9 BackBuffer to PixelArray

Question

我在试着玩DirectX游戏。我成功地加载了我的钩子，并且能够使用以下方法将映像/后台缓冲区保存到磁盘上：

HRESULT Capture(IDirect3DDevice9* Device, const char* FilePath)
{
    IDirect3DSurface9* RenderTarget = nullptr;
    HRESULT result = Device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &RenderTarget);
    //for some reason result is never S_OK but this still works.
    result = D3DXSaveSurfaceToFile(FilePath, D3DXIFF_PNG, RenderTarget, nullptr, nullptr);
    SafeRelease(RenderTarget);
    return result;
}

它成功地拯救了我们，我很高兴。但是，我希望保存到像素数组，而不是磁盘。我试着用：

#include <memory>

std::unique_ptr<std::uint8_t[]> mem(new std::uint8_t[100 * 100 * 4]);

HRESULT Direct3DDevice9Proxy::EndScene()
{
    IDirect3DSurface9* RenderTarget = nullptr;
    HRESULT result = ptr_Direct3DDevice9->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &RenderTarget);

    D3DLOCKED_RECT LR;
    RenderTarget->LockRect(&LR, nullptr, D3DLOCK_NOSYSLOCK | D3DLOCK_READONLY);
    memcpy(mem.get(), LR.pBits, LR.Pitch - 1);
    RenderTarget->UnlockRect();

    SafeRelease(RenderTarget);
    return ptr_Direct3DDevice9->EndScene();
}

但是，它从不锁定，如果我尝试访问LR.pBits，它会引发访问冲突。我不知道为什么锁不上。还有另一种方法可以将像素从后台缓冲区抓取到字节数组中吗？游戏的最大视口是1366x768。

编辑:我试过：

void dump_buffer(LPDIRECT3DDEVICE9 Device, std::unique_ptr<std::uint8_t[]> &bits)
{
    IDirect3DSurface9* RenderTarget = nullptr;
    IDirect3DSurface9* DestTarget = nullptr;
    D3DSURFACE_DESC rtDesc = {};

    Device->GetRenderTarget(0, &RenderTarget);
    RenderTarget->GetDesc(&rtDesc);

    Device->CreateOffscreenPlainSurface(rtDesc.Width, rtDesc.Height, rtDesc.Format, D3DPOOL_DEFAULT, &DestTarget, nullptr);
    Device->GetRenderTargetData(RenderTarget, DestTarget);

    if(DestTarget != nullptr)
    {
        D3DLOCKED_RECT rect;
        DestTarget->LockRect(&rect, 0, D3DLOCK_READONLY);    
        memcpy(bits.get(), rect.pBits, rtDesc.Width * rtDesc.Height * 4);

        std::uint8_t* ptr = &bits[0];
        CG::Image(ptr, rtDesc.Width, rtDesc.Height).Save("Foo.bmp");

        DestTarget->UnlockRect();
        DestTarget->Release();
    }

    RenderTarget->Release();
}

HRESULT Direct3DDevice9Proxy::EndScene()
{
    dump_buffer(ptr_Direct3DDevice9, mem);
    return ptr_Direct3DDevice9->EndScene();
}

但我的形象是黑色的。有什么想法吗？

Answer 1

请注意，EndScene排队等待呈现的场景--不能保证在此之前(甚至是之后)已经呈现了任何内容。

IDirect3DDevice9:GetFrontBufferData可能对你更有用。它“生成设备前端缓冲区的副本，并将该副本放置在应用程序提供的系统内存缓冲区中。

您要做的是调用CreateOffscreenPlainSurface在系统内存中创建pSurface，然后调用GetFrontBufferData(0，pSurface)。

Answer 2

有点晚了。但希望这对某人有帮助。

创建

        if (SUCCEEDED(hr = _device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &backBuf)))
        {
            D3DSURFACE_DESC sd;
            backBuf->GetDesc(&sd);

            if (SUCCEEDED(hr = _device->CreateOffscreenPlainSurface(sd.Width, sd.Height, sd.Format, D3DPOOL_SYSTEMMEM, &_surface, NULL)))

俘获

    if (SUCCEEDED(hr = _device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &backBuf)))
    {
        if (SUCCEEDED(hr = _device->GetRenderTargetData(backBuf, _surface)))
        {
            if (SUCCEEDED(hr = D3DXSaveSurfaceToFileInMemory(&buf, D3DXIFF_DIB, _surface, NULL, NULL)))
            {
                LPVOID imgBuf = buf->GetBufferPointer();
                DWORD length = buf->GetBufferSize();

在buf中，您将获得原始图像数据。别忘了释放一切。