自学教程：C++ CreateRenderTarget函数代码示例

//--------------------------------------------------------------------------------------// Name: Downsample4x4Texture()// Desc: Scale down pSrcTexture by 1/4 x 1/4 and place the result in pDstTexture//--------------------------------------------------------------------------------------VOID PostProcess::Downsample4x4Texture( LPDIRECT3DTEXTURE9 pSrcTexture,                                        LPDIRECT3DTEXTURE9 pDstTexture ){    // Make sure that the required shaders and objects exist    assert( m_pDownScale4x4PS );    assert( pSrcTexture && pDstTexture );    XGTEXTURE_DESC SrcDesc;    XGGetTextureDesc( pSrcTexture, 0, &SrcDesc );    // Create and set a render target    PushRenderTarget( 0L, CreateRenderTarget( pDstTexture ) );    // Get the sample offsets used within the pixel shader    XMVECTOR avSampleOffsets[MAX_SAMPLES];    GetSampleOffsets_DownScale4x4( SrcDesc.Width, SrcDesc.Height, avSampleOffsets );    g_pd3dDevice->SetPixelShaderConstantF( PSCONST_avSampleOffsets, ( FLOAT* )avSampleOffsets, MAX_SAMPLES );    g_pd3dDevice->SetPixelShader( m_pDownScale4x4PS );    g_pd3dDevice->SetTexture( 0, pSrcTexture );    g_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_POINT );    g_pd3dDevice->SetSamplerState( 0, D3DSAMP_ADDRESSU, D3DTADDRESS_CLAMP );    g_pd3dDevice->SetSamplerState( 0, D3DSAMP_ADDRESSV, D3DTADDRESS_CLAMP );    // Draw a fullscreen quad    DrawFullScreenQuad();    g_pd3dDevice->Resolve( D3DRESOLVE_RENDERTARGET0, NULL, pDstTexture, NULL,                           0, 0, NULL, 1.0f, 0L, NULL );    // Cleanup and return    PopRenderTarget( 0L )->Release();    g_pd3dDevice->SetPixelShader( NULL );}

HRESULT CreateDeviceD3D(HWND hWnd){    // Setup swap chain    DXGI_SWAP_CHAIN_DESC sd;    ZeroMemory(&sd, sizeof(sd));    sd.BufferCount = 2;    sd.BufferDesc.Width = 0;    sd.BufferDesc.Height = 0;    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;    sd.BufferDesc.RefreshRate.Numerator = 60;    sd.BufferDesc.RefreshRate.Denominator = 1;    sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;    sd.OutputWindow = hWnd;    sd.SampleDesc.Count = 1;    sd.SampleDesc.Quality = 0;    sd.Windowed = TRUE;    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;    UINT createDeviceFlags = 0;    //createDeviceFlags |= D3D10_CREATE_DEVICE_DEBUG;    if (D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice) != S_OK)        return E_FAIL;    CreateRenderTarget();    return S_OK;}

//--------------------------------------------------------------------------------------// Create any D3D10 resources that depend on the back buffer//--------------------------------------------------------------------------------------HRESULT CALLBACK OnD3D10SwapChainResized( ID3D10Device* pd3dDevice, IDXGISwapChain* pSwapChain,                                          const DXGI_SURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext ){    HRESULT hr = S_OK;    V_RETURN( g_DialogResourceManager.OnD3D10ResizedSwapChain( pd3dDevice, pBackBufferSurfaceDesc ) );    V_RETURN( g_D3DSettingsDlg.OnD3D10ResizedSwapChain( pd3dDevice, pBackBufferSurfaceDesc ) );    // Setup the camera's projection parameters    float fAspectRatio = pBackBufferSurfaceDesc->Width / ( FLOAT )pBackBufferSurfaceDesc->Height;    g_Camera.SetProjParams( 60.0f * ( D3DX_PI / 180.0f ), fAspectRatio, 0.1f, 100.0f );    g_Camera.SetWindow( pBackBufferSurfaceDesc->Width, pBackBufferSurfaceDesc->Height );    g_Camera.SetButtonMasks( MOUSE_LEFT_BUTTON, MOUSE_WHEEL, MOUSE_MIDDLE_BUTTON );    g_HUD.SetLocation( pBackBufferSurfaceDesc->Width - 170, 0 );    g_HUD.SetSize( 170, 170 );    g_SampleUI.SetLocation( pBackBufferSurfaceDesc->Width - 170, pBackBufferSurfaceDesc->Height - 300 );    g_SampleUI.SetSize( 170, 300 );    // Update the sample count    UpdateMSAASampleCounts( pd3dDevice, pBackBufferSurfaceDesc->Format );    // Create a render target    g_BackBufferWidth = pBackBufferSurfaceDesc->Width;    g_BackBufferHeight = pBackBufferSurfaceDesc->Height;    V_RETURN( CreateRenderTarget( pd3dDevice, g_BackBufferWidth, g_BackBufferHeight, g_MSAASampleCount, 0 ) );    return hr;}

bool GSDevice10::CopyOffscreen(Texture& src, const GSVector4& sr, Texture& dst, int w, int h, int format){	dst = Texture();	if(format == 0)	{		format = DXGI_FORMAT_R8G8B8A8_UNORM;	}	if(format != DXGI_FORMAT_R8G8B8A8_UNORM && format != DXGI_FORMAT_R16_UINT)	{		ASSERT(0);		return false;	}	Texture rt;	if(CreateRenderTarget(rt, w, h, format))	{		GSVector4 dr(0, 0, w, h);		StretchRect(src, sr, rt, dr, m_convert.ps[format == DXGI_FORMAT_R16_UINT ? 1 : 0], NULL);		if(CreateOffscreen(dst, w, h, format))		{			m_dev->CopyResource(dst, rt);		}	}	Recycle(rt);	return !!dst;}

LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam){    if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam))        return true;    switch (msg)    {    case WM_SIZE:        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)        {            ImGui_ImplDX10_InvalidateDeviceObjects();            CleanupRenderTarget();            g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);            CreateRenderTarget();            ImGui_ImplDX10_CreateDeviceObjects();        }        return 0;    case WM_SYSCOMMAND:        if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu            return 0;        break;    case WM_DESTROY:        PostQuitMessage(0);        return 0;    }    return DefWindowProc(hWnd, msg, wParam, lParam);}

	//------------------------------------------------------------------------------------------	bool CGraphicDevice::Reset(int i_nWidth, int i_nHeight )	{		HRESULT hr;		// サ
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