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BHRE Release 1.0

Wed, 02 Aug 2006 13:05:00 GMT

摘要: BHRE是由北京航空航天大学计算机学院虚拟现实与可视化研�I�所自主研发的新一代图形绘制引擎�?

BHRE使用OpenGL作�ؓ底层囑�ŞAPI�Q�采用CG作�ؓShader开发语�a��Q�在场景�l�织和状态管理的基本数据�l�构基础上，研发了包括一�p�d��面向三维游戏、仿真模拟、�O游展�C�等实时三维囑�Ş应用的功能�?

* Features
o 基本3DS模型载入
o 视点�q�动
o 对象�q�动
o 裁减��法
o 天空�?
o 大规模地�?
o 三维声音
o ��撞��?
o 雾效�?
o 多光源效�?
o ��Z��GPU的水波特�?
o Video�U�理
o LOD 阅读全文

苦行�?/a> 2006-08-02 21:05 发表评论

又好几天没更��C��

Fri, 19 May 2006 08:09:00 GMT

�l�于把基于CgFx的引擎调出来了，�q�周要重新规划一下了�Q�又要考虑好多东西�Q�还没有形成思�\�Q�就雉��散散的记录一些吧�?br />
1�Q�FragmentProgram不处理的东西�Q�如fog,depth会自动流到处理他们的环节�?br />2, VertexProgram替代掉的��只是Tranform和Lighting�Q�FragmentProgram替代掉的时Fragment的Color和纹理插值出来的Color按照�U�理的颜色模式进行�؜合的部分�?br />3�Q�openGL的高�U�版本中有，光照中glLightMode()中可以指定将Specular的部分带到光栅化以后起作用，��是说即便VertexProgram只是输出一个Color��|��最后即侉K��用GL_REPLACE的方式也可以体现出Specular来。我惌��一部分FS是不能控制的�?br />

看到一个网址�Q�http://tony3d.cnblogs.com/archive/2006/05/02/390753.html
本来我写�q�个是想保存一点资料，转蝲一�Ҏ��章（现在也不转了�Q�有时候涉及版权的问题�Q�，记录一点心得，没想到这家伙居然把我的blog也列�q�去了，真是丢�h现眼�Q�呵呵，�q�是扑ֆ�真正高手的blog吧，比如http://www.humus.ca/�?br />

苦行�?/a> 2006-05-19 16:09 发表评论

Tue, 25 Apr 2006 15:41:00 GMT

��水帐，随手��C��Q?br />

直到现在我才明白�Q?/span>CG�?/span>CG�Q?/span>CGFX�?/span>CGFX�Q?/span>CG是一�U�语�a��Q?/span>CGFX是一套编�E�模型，而我们要做的是封�?/span>cgFX�Q�有�?/span>CGFX��有更强的一�U�表达，可以对不同的Profile指定配置�Q�可以设�?/span>openGL state�?/span>

对于D3D的绘制方式而言�Q�是�Ҏ��名字得到Technique的句柄，然后每次�l�制Mesh前设定生效的Technique�Q�在遍历�?/span>Technique下的所�?/span>Pass�Q�逐一�q�行�l�制�Q?/span>
那么对于OpenGL来说�Q�我们只知道�?/span>CreateProgram的时候指定一个入口函敎ͼ�那对于具有多�?/span>Technique的情冉|��们还不知道怎么�q�行切换�Q�是用两�?/span>Program表示呢，�q�是调用什么参数可以切换？
但是不管怎么表示�Q�从概念上是应该允许�?/span>D3D那样指定的，卛_��某一�?/span>Mesh�l�制前指定用某一�?/span>Effect的某一�?/span>Technique�Q�甚�?/span>Pass�?/span>
后来查到在cg1.2发布的cg_tookit里边提供了CgFx的很好的支持�Q�能够想D3D Effect格式那样ICgFxEffect->setTechnique()�Q�有pass->begin(),pass->end()�q�种�Ҏ��Q�但是不知道��Z��么到cg1.4把这些东西去掉了。在cgReleaseNote里边写到�Q?/span>

Complete rewrite of CgFX, including an API integrated with the Cg runtime API, support for extensible, cross-platform graphics state management, and support for unsized arrays and interfaces.

��是说重写了�Q�跟以前不一样儿了，后边�l�了对于使用CgFx库的说明�Q?br />

Applications and effects that used previous versions of CgFX will require modification.Applications that use CgFX will have to be modified to use the new CgFX API. If the supplied OpenGL state manager for CgFX is used, the effect files themselves must be modified. The effects must be changed to use OpenGL state assignments, rather than the D3D state assignments supported in prior versions of CgFX. A subsequent release of Cg will provide D3D and cross-platform state managers for CgFX.
CgFX has been redesigned and re-implemented. As noted above, existing applications that use CgFX must be modified if the new API is to be used. In addition, if you wish to use the supplied “native�?OpenGL state manager, which assumes that OpenGL-style state names and vales are used in effects, existing effects must be modified to use OpenGL-style states. See the “Introduction to CgFX�?chapter in the Cg Users Manual for more details. If you have questions or problems related to porting existing CgFX applications, please contact NVIDIA developer relations.
太恶心了�Q�就是说原来如果你用了很好实现的CgFx�Q�现在对不�v�Q�不能用了�?/span>所以我看到的早期的使用cg1.2�?/span>nebula2都封装了CGFX�Q�但是到�?/span>1.4不知道�ؓ什么，发布�?/span>CG_tookit里边却去掉了�q�个CGFX的运行库�?/span>nebula2新的版本也去掉了CGFX�Q�只剩下D3DShader的支持�?/span>
上边�q�段话最�?span style="font-family: SimSun;" lang="ZH-CN">说如果有问题�Q�联�p�Nvidia developer relations。我想一想也没有办法了，去问wj大牛都不知道怎么回事儿，那只好去问一下了�Q�结果到了nvidia developer�|�站上也差不到可以直接问谁，�q�填了一张表注册了一个用��P��现在�q�没有被批下来。最后实在等不及了，去论坛上问吧。下面几个地址�Q�没准儿有熟知cg的�h可以�{�复一�?
http://www.gamedev.net/community/forums/topic.asp?topic_id=389475

http://www.smth.org/bbscon.php?bid=50&id=43518

http://www.smth.org/bbscon.php?bid=197&id=50169

http://forums.nvidia.com/index.php?showtopic=13875

再看看Nvidia到底怎么说的�Q?br />

Cg1.1里边关于cgFX��_��

CgFX beta support for DirectX 8, DirectX 9, and OpenGL

Cg1.2里边关于cgFX��_��

Cg Effects Explained document

CgFX beta support for DirectX 8, DirectX 9, and OpenGL

Cg1.4.1里边关于cgFX��_��

Complete rewrite of CgFX, including an API integrated with the Cg runtime API, support for extensible, cross-platform graphics state management, and support for unsized arrays and interfaces.

Cg1.5beta里边关于cgFX��_��

Cg 1.3 and 1.4 style Effects files supported

又考察�?/span>openGL2.0�?/span>GLSL�Q�发现对于绘制的描述感觉�?/span>CG1.4�?/span>FX的运行库也差不多�Q�又因�ؓ不熟悉，�q�是回头�?/span>cgFX吧�?/span>
装了cg1.2看原来的文档�Q�学习笔记如下：

cgFX主要提供了三点好处：

不同��g得以配置(technique,profile)
多遍�l�制的描�q?/span>(pass)
表达了环境信�?/span>(state)

cgFX�?/span>microsoft FX2.0�?/span>DirectX9.0�?/span>Effect格式�怼�
cgFX既可以在openGL又可以在D3D上运行，便于以后扩展
主要�Ҏ��接口�Q?/span>

CgFXCreateEffect�Q�CgFXCreateEffectFromFileA�Q�CgFXCreateEffectCompiler�Q�CgFXCreateEffectCompilerFromFileA
CgFXSetDevice�Q�CgFXFreeDevice
CGFXHANDLE GetTechnique(UINT index);CGFXHANDLE GetTechniqueByName(LPCSTR name);
CGFXHANDLE GetPass(CGFXHANDLE technique, UINT index);CGFXHANDLE GetPassByName(CGFXHANDLE technique, LPCSTR name);
CGFXHANDLE GetParameter(CGFXHANDLE parent, UINT index);

CGFXHANDLE GetParameterByName(CGFXHANDLE parent, LPCSTR name);
CGFXHANDLE GetParameterBySemantic(CGFXHANDLE parent, LPCSTR name);
CGFXHANDLE GetParameterElement(CGFXHANDLE parent, UINT element);

HRESULT FindNextValidTechnique(CGFXHANDLE hTechnique,CGFXHANDLE *pTechnique);
HRESULT SetTechnique(CGFXHANDLE pTechnique);CGFXHANDLE GetCurrentTechnique();
HRESULT Begin(UINT* pPasses, DWORD Flags);HRESULT Pass(UINT passNum);HRESULT End();
HRESULT CloneEffect(ICgFXEffect** ppNewEffect);

HRESULT GetDevice(LPVOID* ppDevice);
HRESULT OnLostDevice();
HRESULT OnResetDevice();

主要接口�Q?/span>

ICgFXBaseEffect
ICgFXEffect
ICgFXEffectCompiler

苦行�?/a> 2006-04-25 23:41 发表评论

shader学习�W�记�Q?�Q�－cg openGL runtime library

Fri, 21 Apr 2006 22:37:00 GMT

shade 学习�W�记�Q?/span> 3 �Q�－ cg openGL runtime library

�?/span> uniform 参数讄��?/span> openGL 以后是保存在 CG openGL runtime 里边或�?/span> cg core runtime 里边�Q��?/span> d 3d 是直接保存到 GPU �?/span> constant memory 里边�?/span>
openGL 在��?/span> CG 的时候必��首先��用wglCreateContext() or glXCreateContext()来创�?/span> openGL Context �?/span>
讄�� Uniform参数�Q?/li>

cgGLSetParameter�Q�两�U�类�?/span> float (f),double(d).
cgGLSetMatrixParameterfr , cgGLSetMatrixParameter dc, 四种�Q?/span> c 表示列向量�ؓ主， r 表示 row 向量��Z��?/span>
cgGLSetStateMatrixParameter()可以用来讄��状态矩阵，包括 ModelView 矩阵�Q?/span> Projection 矩阵�Q�纹理矩��c�?/span>
cgGLSetParameterArray�Q�）用来讄�� Uniform 的数�l�参敎ͼ�cgGLSetMatrixParameterArrayfr用来讄��矩阵数组

讄��变量参数�Q?br />

因�ؓFP的变量参数是按照光栅化插值后的结果来讄��的，所以只�?/span>VS�E�序有变量参数�?/span>
讄��变量参数两步�Q?/span>

cgGLSetParameterPointer()�Q�设�|�变量数�l�，我理解就是顶�Ҏ��l?/li>
void cgGLEnableClientState(CGparameter parameter);和void cgGLDisableClientState(CGparameter parameter);使得该参数有效�?/li>

注意�Q�cgGLSetParameter也可以用来设�|�变量参敎ͼ��q�时采用的是openGL立即模式�Q�也��q��当于glVertex,glNormal�Q?/span>glColor�q�样的做法吧�Q�但是我惌��昄��是一�U�效率不高的做法。且cgGLGetParameter不能用来取变量参数�?/span>

讄��Sampler参数�Q?/span>Sampler和纹理是一一对应的，所以实际就是对一�D�顶点绘制指定一个纹理�?/span>

cgGLSetTextureParameter(CGparameter parameter,GLuint textureName);来指定一个纹理给CGParameter�?/span>
void cgGLEnableTextureParameter(CGparameter parameter);来�ɾU�理生效。void cgGLDisableTextureParameter(CGparameter parameter);使其失效�Q�相当于glBindTexture命��o�?/span>

void cgGLSetOptimalOptions(CGprofile profile);来��用最优的Profile。而CGbool cgGLIsProfileSupported(CGprofile profile);可以用来判断��g是否支持�?/span>Profile�?br />
�l�过�q�几天的学习�Q�终于大概明白了shader是怎么work的了�Q�但是对于用programmable pipeline替换掉fixed function�q�是一头雾水�?br />

苦行�?/a> 2006-04-22 06:37 发表评论

shader学习�W�记�Q?�Q? Using Cg Runtime Library整理

Thu, 20 Apr 2006 17:29:00 GMT

摘要: 阅读全文

苦行�?/a> 2006-04-21 01:29 发表评论

shader学习�W�记�Q?�Q�－basic cg in openGL

Wed, 19 Apr 2006 17:43:00 GMT

摘要: 阅读全文

苦行�?/a> 2006-04-20 01:43 发表评论