setRenderTarget（）用法总结

最新推荐文章于 2025-10-27 11:56:49 发布

原创最新推荐文章于 2025-10-27 11:56:49 发布 · 2k 阅读

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本文详细介绍了如何使用RTT（Render To Texture）技术和ShadowMap来实现阴影效果。通过创建纹理和深度模板，设置渲染目标，以及在每帧中进行渲染场景到纹理的过程，展示了完整的实现步骤。

网上查了很多，很多是rtt，，setRenderTarget（）的不多，借鉴shadowmap例子，

初始化

    //创建shadowmap纹理
   hr = pd3dDevice->CreateTexture( m_TextureSize, m_TextureSize, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &m_pRTTTexture, NULL);
   //创建深度模板
   hr = pd3dDevice->CreateDepthStencilSurface(m_TextureSize, m_TextureSize, D3DFMT_D24X8, D3DMULTISAMPLE_NONE, 0, TRUE, &m_pRTTSurface, NULL);

每帧（这里写在了一个beginscene()和endScene()之间，以提高灵活性，很多都是写了两个beginScene()

V(pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 45, 50, 170), 1.0f, 0));
pd3dDevice->BeginScene();

   LPDIRECT3DSURFACE9 backgroundSurface = NULL;
   pd3dDevice->GetRenderTarget(0, &backgroundSurface);
   LPDIRECT3DSURFACE9 pOldDS = NULL;
   pd3dDevice->GetDepthStencilSurface(&pOldDS);
   LPDIRECT3DSURFACE9 RTTSurface = NULL;
   g_OccluderObject.ReturnTexture()->GetSurfaceLevel(0, &RTTSurface);

   pd3dDevice->SetRenderTarget(0, RTTSurface);
   pd3dDevice->SetDepthStencilSurface(g_OccluderObject.getRTTSurface());
   V(pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 45, 50, 170), 1.0f, 0));
   pd3dDevice->BeginScene();
   g_OccluderObject.RenderToTexture(pd3dDevice, &g_matView, &g_matProject,&g_matViewRTT, &g_matProjectRTT);
   pd3dDevice->EndScene();
   //恢复以前的背景页面
   pd3dDevice->SetRenderTarget(0, backgroundSurface);
   pd3dDevice->SetDepthStencilSurface(pOldDS);
   //渲染物体
   g_OccluderObject.renderObjectVector(pd3dDevice);
   g_TextureDebug.OnFrameRender(pd3dDevice, g_OccluderObject.ReturnTexture(), 0);
   pd3dDevice->EndScene();

   backgroundSurface->Release();
   backgroundSurface = NULL;
   RTTSurface->Release();
   RTTSurface = NULL;
   pOldDS->Release();
   pOldDS = NULL;