CEGUI 对RTT纹理的支持------Gamebryo实现渲染到CEGUI窗口

  最近在纠结新版CEGUI的特性研究和拓展。验证并实现几个CEGUI的特性：

1、CEGUI对Shader的支持拓展。

2、CEGUI用Shader实现灰化，多纹理图片叠层。

3、Gamebryo渲染到CEGUI窗口纹理（装备预览）。

 

以下完整解释下第三点的实现，Gamebryo是在Frame System帧系统实现的：

1、构建一个NiRenderClick其作为渲染主角，其渲染结果作为输出，渲染到CEGUI窗口：

RTTHandleClick.hclass RTTHandleClick : public NiRenderClick{public:RTTHandleClick();~RTTHandleClick(){};// Functions for reporting statistics about the most recent frame.virtual unsigned int GetNumObjectsDrawn() const;virtual float GetCullTime() const;virtual float GetRenderTime() const;protected:virtual void PerformRendering(unsigned int uiFrameID);WorldManager*m_pkWorldManager;// Rendering statistics.float m_fRenderTime;};RTTHandleClick.cppvoid RTTHandleClick::PerformRendering(unsigned int uiFrameID){NiDX9Renderer* pkD3DRenderer = NiDX9Renderer::GetRenderer();NiRenderer* pkRenderer = NiRenderer::GetRenderer();//.........................//中间省略大堆渲染状态处理m_pkWorldManager->BeginCamera();m_pkWorldManager->DrawRTT();//实际渲染角色方法，自己要渲染什么写里面m_pkWorldManager->EndCamera();//.........................//中间省略大堆渲染状态处理}

 

2、同样构建一个CEGUIHandleClick作为CEGUI的渲染。

 

class CEGUIHandleClick : public NiRenderClick{public:CEGUIHandleClick();~CEGUIHandleClick(){};// Functions for reporting statistics about the most recent frame.virtual unsigned int GetNumObjectsDrawn() const;virtual float GetCullTime() const;virtual float GetRenderTime() const;protected:virtual void PerformRendering(unsigned int uiFrameID);// Rendering statistics.float m_fRenderTime;};

 

3、构建一个RunHandleStep，继承于NiDefaultClickRenderStep。

然后把上面两个Click加入此Step:

 m_pkRTTClick = NiNew RTTHandleClick;
 m_pkCEGUIClick = NiNew CEGUIHandleClick;
 AppendRenderClick(m_pkRTTClick);
 AppendRenderClick(m_pkCEGUIClick);

 

同时注册两个方法，一个Step前后回调函数：
 SetPreProcessingCallbackFunc(CopyRTGBufferToTexture,this);
 SetPostProcessingCallbackFunc(SetUITexture,this);

 

4、让RTTHandleClick渲染到纹理：

NiTexture::FormatPrefs kPrefs;kPrefs.m_ePixelLayout = NiTexture::FormatPrefs::TRUE_COLOR_32;kPrefs.m_eAlphaFmt = NiTexture::FormatPrefs::SMOOTH;NiDX9Renderer* pkD3DRenderer = NiDX9Renderer::GetRenderer();//构建一张可渲染纹理m_spRenderTexture =NiRenderedTexture::Create(width, height, NiRenderer::GetRenderer(), kPrefs);//后面详细构建RenderGroup过程m_spRenderGroup = m_pRenderManger->CreateRenderTargetGroupFromTexture(m_spRenderTexture);

 

注意 m_spRenderGroup =   NiRenderTargetGroup::Create(

m_spRenderTexture->GetBuffer(), pkD3DRenderer, true, true);

m_spRenderGroup =  m_pRenderManger->CreateRenderTargetGroupFromTexture(m_spRenderTexture);

 

NiRenderTargetGroup的构建有两种方法，我们不能取其默认的第一种，因为Usage为D3DUSAGE_RENDERTARGET的Texture不能进行反锯齿, 而且Pool必须为D3DPOOL_DEFAULT. 如果想利用RenderTarget做为纹理又想反锯齿, 可以先把场景渲染到一个CreateRenderTarget创建的Surface(或BackBuffer)上, 再用IDirect3DDevice9::StretchRect拷贝到纹理上。

 

我详细列出CreateRenderTargetGroupFromTexture的代码细节：

 

NiRenderTargetGroupPtr AFRendererManager::CreateRenderTargetGroupFromTexture(NiRenderedTexture* pRenderedTexture){NIASSERT(pRenderedTexture);NiRenderer* pkRenderer = 0;pkRenderer = NiRenderer::GetRenderer();LPDIRECT3DSURFACE9 pkRenderSurface = CreateMSAARenderTargetSurface(pRenderedTexture);NIASSERT(pkRenderSurface);Ni2DBuffer* pkColorBuffer = NULL;NiDX92DBufferData* pkColorBufferData = NiDX9Direct3DBufferData::Create(pkRenderSurface,pkColorBuffer);NI_UNUSED_ARG(pkColorBufferData);NIASSERT(pkColorBufferData && pkColorBuffer);// pkColorBufferData now has a reference to the surface, so we can// release the original reference.pkRenderSurface->Release();// Create NiRenderTargetGroup using default depth/stencil buffer// We know that the size and MS levels of the new render target // surface are identical to the default back buffer, so we know the // default depth/stencil buffer is compatible.NiRenderTargetGroupPtr spPostEffectTargetGroup = NiRenderTargetGroup::Create(pkColorBuffer, pkRenderer, true);return spPostEffectTargetGroup;}LPDIRECT3DSURFACE9 AFRendererManager::CreateMSAARenderTargetSurface(NiRenderedTexture* pkRenderedTexture){NIASSERT(pkRenderedTexture);NiRenderer* pkRenderer = 0;pkRenderer = NiRenderer::GetRenderer();NIASSERT(pkRenderer);NiDX9Renderer* pkDX9Renderer = NiDynamicCast(NiDX9Renderer, pkRenderer);NIASSERT(pkDX9Renderer);// Get MultiSamplers parametersD3DPRESENT_PARAMETERS* pkD3DPresentParams = pkDX9Renderer->GetPresentParams();D3DMULTISAMPLE_TYPE kMultiSampleType = pkD3DPresentParams->MultiSampleType;unsigned int kMultiSampleQuality = (unsigned int)pkD3DPresentParams->MultiSampleQuality;// Get pixel format information from rendered textureD3DFORMAT eFormat = NiDX9PixelFormat::DetermineD3DFormat(*pkRenderedTexture->GetPixelFormat());// Create render target surfaceLPDIRECT3DDEVICE9 pkDevice = pkDX9Renderer->GetD3DDevice();LPDIRECT3DSURFACE9 pkRenderSurface = NULL;HRESULT hr = E_FAIL;hr = pkDevice->CreateRenderTarget(pkRenderedTexture->GetWidth(),pkRenderedTexture->GetHeight(), eFormat, kMultiSampleType, kMultiSampleQuality, FALSE, &pkRenderSurface, NULL);NIASSERT(SUCCEEDED(hr) && pkRenderSurface);return pkRenderSurface;}

 

创建一个RenderTargetSurface，然后把Surface拷到NiDX92DBufferData，然后通过NiDX92DBufferData构建NiRenderTargetGroup。

 

5、在RenderStep执行后的回调SetUITexture中。（前面SetPostProcessingCallbackFunc(SetUITexture,this)，已经注册）

注意SetUITexture代码细节：

bool RunHandleStep::SetUITexture(NiRenderStep* pkCurrentRenderClick, void* pvCallbackData){RunHandleStep* pkThis = (RunHandleStep*) pvCallbackData;NiDX9TextureData* pkData = (NiDX9TextureData*)pkThis->m_spRenderTexture->GetRendererData();LPDIRECT3DTEXTURE9 rttTexture= (LPDIRECT3DTEXTURE9)pkData->GetD3DTexture();//m_pSample->SetRttTexture(rttTexture);GameGUISystem::Create()->SetRttTexture(rttTexture);//D3DXSaveTextureToFile(("F://TEST_A.tga"),D3DXIFF_TGA,rttTexture,NULL);return true;}bool GameGUISystem::SetRttTexture(LPDIRECT3DTEXTURE9 pTextureData){WindowManager& winMgr = WindowManager::getSingleton();CEGUI::Direct3D9Renderer* pRender = static_cast<CEGUI::Direct3D9Renderer*>(CEGUI::System::getSingleton().getRenderer());Window* background = winMgr.getWindow("Demo7/Window3/RTT");if (!m_pImageset){Texture& tex = pRender->createTexture(pTextureData);m_pImageset = &(ImagesetManager::getSingleton().create("RTTImage", tex));m_pImageset->defineImage("RttImage", Point(0.0f, 0.0f),tex.getSize(), CEGUI::Point(0.0f,0.0f));}Texture* texture = m_pImageset->getTexture();((Direct3D9Texture*)texture)->setDirect3D9Texture(pTextureData);background->setProperty("Image", "set:RTTImage image:RttImage");return true;}

 

就如此简单。哈哈。大家实现了没。。