检索另一个渲染过程的渲染的depthBuffer。 （D3DX9）

Question

我正在渲染场景到纹理，然后在后续渲染中使用该纹理及其depthBuffer来应用一些效果（景深，绽放等......）。

问题在于：我设法将DepthStencilBuffer设置为自定义曲面并将场景渲染为纹理。场景渲染完美，没有深度问题。这就是说，当使用纹理（自定义曲面绑定到的）时，所有深度值都正好是1.0

我怀疑对设备的调用 - >清除以影响错误的表面，但即使禁用它们，它也无法解决任何问题。

以下是实际代码：

HRESULT hr = S_FALSE;

VCND3D* renderer = static_cast<VCND3D*>( VCNRenderCore::GetInstance() );
LPDIRECT3DDEVICE9 device = renderer->GetD3DDevice();

//device->EndScene();

VCNDXShaderCore* shaderCore = static_cast<VCNDXShaderCore*>( VCNDXShaderCore::GetInstance() );

VCNNode* rootNode = VCNNodeCore::GetInstance()->GetRootNode();

LPDIRECT3DSURFACE9 currentSurface;
device->GetRenderTarget(0, &currentSurface);

LPDIRECT3DSURFACE9 currentDepthBuffer;
device->GetDepthStencilSurface( &currentDepthBuffer );

///// INITIAL HDR RENDER : //////////////////////////////////////

hr = device->SetRenderTarget( 0, mInitialHDRSurface );
VCN_ASSERT( SUCCEEDED(hr) );

hr = device->SetDepthStencilSurface( mDepthSurface );
VCN_ASSERT( SUCCEEDED(hr) );

device->Clear(  0,
                NULL,
                D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
                D3DCOLOR_XRGB(100,100,100),
                1.0f,
                0 );

//device->BeginScene();
rootNode->Render();
//device->EndScene();

//hr = device->UpdateSurface( currentDepthBuffer, NULL, mDepthSurface, NULL );
//VCN_ASSERT( SUCCEEDED(hr) );

//////////// DOF EFFECT : /////////////////////////////////////////////////

hr = device->SetRenderTarget( 0, currentSurface );
VCN_ASSERT( SUCCEEDED(hr) );

device->SetRenderState(D3DRS_COLORWRITEENABLE, 
D3DCOLORWRITEENABLE_ALPHA | D3DCOLORWRITEENABLE_RED | D3DCOLORWRITEENABLE_GREEN | D3DCOLORWRITEENABLE_BLUE);

device->Clear(  0,
                NULL,
                D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
                D3DCOLOR_XRGB(100,100,100),
                1.0f,
                0 );

//device->BeginScene();

// Set DOF shader
VCNDXShader* dofShader = shaderCore->GetShader( sidDof );

// Field of view to cover full screen :
hr = device->SetFVF(D3DFVF_SCREEN);
VCN_ASSERT( SUCCEEDED(hr) );

// select the vertex buffer to display
hr = device->SetStreamSource(0, mScreenVertexBuffer, 0, sizeof(SCREENVERTEX));
VCN_ASSERT( SUCCEEDED(hr) );

// Draw the Dof result
hr = dofShader->GetEffect()->SetTechnique( "BaseTechnique" );
VCN_ASSERT( SUCCEEDED(hr) );
hr = dofShader->GetEffect()->SetTexture( "gInputImageTexture", mInitialHDRTexture );
VCN_ASSERT( SUCCEEDED(hr) );
hr = dofShader->GetEffect()->SetTexture( "gDepthTexture", mDepthTexture );
VCN_ASSERT( SUCCEEDED(hr) );
hr = dofShader->GetEffect()->SetFloat( "gMinDepth", 3.0f );
VCN_ASSERT( SUCCEEDED(hr) );
hr = dofShader->GetEffect()->SetFloat( "gMaxDepth", 7.0f );
VCN_ASSERT( SUCCEEDED(hr) );

dofShader->RenderPrimitive( 2, D3DPT_TRIANGLESTRIP );

hr = device->SetDepthStencilSurface( currentDepthBuffer );
VCN_ASSERT( SUCCEEDED(hr) );

这里是纹理和曲面的初始化，因为错误可能在那里：

// Texture for the initial HDR Render (Before effects)
hr = device->CreateTexture(res.x, res.y, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A32B32G32R32F, D3DPOOL_DEFAULT, &mInitialHDRTexture, 0);
VCN_ASSERT_MSG( SUCCEEDED(hr), _T("Unable to create initial HDR Render Texture") );

// Extract the associated surface for rendering
hr = mInitialHDRTexture->GetSurfaceLevel(0, &mInitialHDRSurface);
VCN_ASSERT( SUCCEEDED(hr) );

// Texture with depth of the scene
hr = device->CreateTexture(res.x, res.y, 1, D3DUSAGE_DEPTHSTENCIL, D3DFMT_D32F_LOCKABLE, D3DPOOL_DEFAULT, &mDepthTexture, 0);
VCN_ASSERT_MSG( SUCCEEDED(hr), _T("Unable to create depth texture") );

// Extract the associated surface for rendering
hr = mDepthTexture->GetSurfaceLevel(0, &mDepthSurface);
VCN_ASSERT( SUCCEEDED(hr) );

请注意，没有ASSERT被触发（这正是让我感到沮丧，我想要一些错误作为指示在哪里看）

尼克

Answer 1

如果我正确阅读了您的代码，请清除mDepthSurface两次：首先在INITIAL HDR RENDER部分，然后在DOF EFFECT。您需要在第二次清除之前执行SetDepthStencilSurface，或者不在该呼叫中设置D3DCLEAR_ZBUFFER。否则，第二次清除会丢弃rootNode->Render()所呈现的任何内容，并且在效果开始时，您将拥有所有清晰的z缓冲区。