恢复CEGUI渲染状态
刚刚接触CEGUI，在原D3D程序上画了一个小窗口后，发现渲染效果于以前的大相径庭，查看了源代码后发现，原来CEGUI在渲染后并没有恢复到默认的渲染状态，于是改之，再编译、运行、一切正常。。。
下面是恢复其渲染状态的代码，与初始化渲染状态函数initPerFrameStates()对应
1 
void DirectX9Renderer::UnitFrameStates()
2 
{
3 
// setup vertex stream
4
5 d_device -> SetFVF(NULL);
6
7 // set device states
8 d_device -> SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE);
9 d_device -> SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
10 d_device -> SetRenderState(D3DRS_ALPHATESTENABLE, FALSE);
11 d_device -> SetRenderState(D3DRS_ZWRITEENABLE, TRUE);
12 d_device -> SetRenderState(D3DRS_FOGENABLE, FALSE);
13 d_device -> SetRenderState(D3DRS_CULLMODE, D3DCULL_CCW);
14
15
16 // setup texture addressing settings/*
17 d_device -> SetSamplerState( 0 , D3DSAMP_ADDRESSU, D3DTADDRESS_WRAP);
18 d_device -> SetSamplerState( 0 , D3DSAMP_ADDRESSV, D3DTADDRESS_WRAP);
19
20 // setup colour calculations
21 d_device -> SetTextureStageState( 0 , D3DTSS_COLORARG1, D3DTA_TEXTURE);
22 d_device -> SetTextureStageState( 0 , D3DTSS_COLORARG2, D3DTA_CURRENT);
23 d_device -> SetTextureStageState( 0 , D3DTSS_COLOROP, D3DTOP_SELECTARG1);
24
25 // setup alpha calculations
26 d_device -> SetTextureStageState( 0 , D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
27 d_device -> SetTextureStageState( 0 , D3DTSS_ALPHAARG2, D3DTA_CURRENT);
28 d_device -> SetTextureStageState( 0 , D3DTSS_ALPHAOP, D3DTOP_SELECTARG1);
29
30 // setup filtering
31 d_device -> SetSamplerState( 0 , D3DSAMP_MINFILTER, D3DTEXF_POINT);
32 d_device -> SetSamplerState( 0 , D3DSAMP_MAGFILTER, D3DTEXF_POINT);
33
34 // disable texture stages we do not need.
35 d_device -> SetTextureStageState( 1 , D3DTSS_COLOROP, D3DTOP_DISABLE);
36
37 // setup scene alpha blending
38 d_device -> SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
39 d_device -> SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ONE);
40 d_device -> SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ZERO);
42 
}
另外CEGUI有2种渲染模式：立即渲染和缓冲渲染。所以在这2种渲染模式结束后都需要调用上面的代码以恢复渲染状态
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