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在Ogre中直接使用D3D

使用Ogre时可以通过 RenderSystem_Direct3D9直接访问D3D

直接使用D3D需要安装D3D SDK，典型的为2010 June SDK

需指定包含路径：

C:/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Include

$(Ogre181)/include/OGRE

库路径：

$(Ogre181)/lib/Debug/opt/RenderSystem_Direct3D9_d.lib

C:/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Lib/x86/d3d9.lib

C:/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Lib/x86/d3dx9.lib

C:/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Lib/x86/DxErr.lib

C:/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Lib/x86/dxguid.lib

这些和RenderSystem_Direct3D9项目设置一样

实际代码需包含头文件：

#include <Ogre/RenderSystems/Direct3D9/OgreD3D9RenderWindow.h>

#include <Ogre/RenderSystems/Direct3D9/OgreD3D9RenderSystem.h>

获取D3D 设备：

IDirect3DDevice9* pDevice = Ogre::D3D9RenderSystem::getActiveD3D9Device();      mWindow->update(false); //这里不翻转，由获取到的Deviece9处理      pDevice->Present(NULL, NULL, NULL, NULL); //测试获取到的Device9是否工作

可以看到获取到的IDirect3DDevice9可以正常使用

再演示一下如何解决上一篇文章中提到的实际问题：获取Ogre或D3D的渲染结果的效率问题

该问题需要获取IDirect3DSurface9和创建离屏表面等

通过查看RenderSystem_Direct3D9源码，可以使用以下办法：

IDirect3DDevice9* pDevice = Ogre::D3D9RenderSystem::getActiveD3D9Device();      IDirect3DSurface9 *surface = NULL;     D3DLOCKED_RECT lrect; // Filled in by D3D     IDirect3DSurface9 *backSurface;      pDevice->CreateOffscreenPlainSurface(renderTarget->getWidth(), renderTarget->getHeight(), D3DFMT_X8R8G8B8,    D3DPOOL_SYSTEMMEM, &surface, 0);      //renderTarget可以为RenderWindow或者RenderTexture     renderTarget->getCustomAttribute("DDBACKBUFFER", &backSurface);      pDevice->GetRenderTargetData(backSurface, surface);      surface->LockRect(&lrect, NULL,  D3DLOCK_READONLY);     char* data = (char *)lrect.pBits; //需要获取的数据指针     surface->UnlockRect();