Creating a Depth Buffer (Direct3D 9)
A depth buffer is a property of the device. To create a depth buffer that is managed by Direct3D, set the appropriate members of the D3DPRESENT_PARAMETERS structure as shown in the following code example.
D3DPRESENT_PARAMETERS d3dpp; ZeroMemory( &d3dpp, sizeof(d3dpp) ); d3dpp.Windowed = TRUE; d3dpp.SwapEffect = D3DSWAPEFFECT_COPY; d3dpp.EnableAutoDepthStencil = TRUE; d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
By setting the EnableAutoDepthStencil member to TRUE, you instruct Direct3D to manage depth buffers for the application. Note that AutoDepthStencilFormat must be set to a valid depth buffer format. The D3DFMT_D16 flag specifies a 16-bit depth buffer, if one is available.
The following call to the IDirect3D9::CreateDevice method creates a device that then creates a depth buffer.
if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &d3dDevice ) ) ) return E_FAIL;
The depth buffer is automatically set as the render target of the device. When the device is reset, the depth buffer is automatically destroyed and re-created in the new size.
To create a new depth buffer surface, use the IDirect3DDevice9::CreateDepthStencilSurface method.
To set a new depth-buffer surface for the device, use the IDirect3DDevice9::SetDepthStencilSurface method.
To use the depth buffer in your application, you need to enable the depth buffer. For details, see Enabling Depth Buffering (Direct3D 9).