Ogre Scene Renderer - 如何将一个可渲染对象加进渲染队列

1. 判断对象是否半透明实体  

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1.   //-----------------------------------------------------------------------  
2.   bool Pass::isTransparent(void) const  
3.   {  
4. // Transparent if any of the destination colour is taken into account  
5. if (mDestBlendFactor == SBF_ZERO &&  
6.     mSourceBlendFactor != SBF_DEST_COLOUR &&  
7.     mSourceBlendFactor != SBF_ONE_MINUS_DEST_COLOUR &&  
8.     mSourceBlendFactor != SBF_DEST_ALPHA &&  
9.     mSourceBlendFactor != SBF_ONE_MINUS_DEST_ALPHA)  
10. {  
11.     return false;  
12. }  
13.    else  
14. {  
15.     return true;  
16. }  
17.   }  

 

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1. //-----------------------------------------------------------------------  
2. void RenderPriorityGroup::addRenderable(Renderable* rend, Technique* pTech)  
3. {  
4.     // Transparent and depth/colour settings mean depth sorting is required?  
5.     // Note: colour write disabled with depth check/write enabled means  
6.     //       setup depth buffer for other passes use.  

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1.      // <strong>这个很长的if决定对象是否半透明实体</strong>  
2.      if (pTech->isTransparentSortingForced() ||   
3. (pTech->isTransparent() &&   
4.          (!pTech->isDepthWriteEnabled() ||  
5.           !pTech->isDepthCheckEnabled() ||  
6.           pTech->hasColourWriteDisabled())))  
7.      {  
8. if (pTech->isTransparentSortingEnabled())  
9.     addTransparentRenderable(pTech, rend);  
10. else  
11.     addUnsortedTransparentRenderable(pTech, rend);  
12.      }  
13.      else  
14.      {  
15.          if (mSplitNoShadowPasses &&  
16.              mParent->getShadowsEnabled() &&  
17.     (!pTech->getParent()->getReceiveShadows() ||  
18.     rend->getCastsShadows() && mShadowCastersNotReceivers))  
19.          {  
20.              // Add solid renderable and add passes to no-shadow group  
21.              addSolidRenderable(pTech, rend, true);  
22.          }  
23.          else  
24.          {  
25.              if (mSplitPassesByLightingType && mParent->getShadowsEnabled())  
26.              {  
27.                  addSolidRenderableSplitByLightType(pTech, rend);  
28.              }  
29.              else  
30.              {  
31.                  addSolidRenderable(pTech, rend, false);  
32.              }  
33.          }  
34.      }  
35.   
36.  }  

 

 

 

每一个RenderPriorityGroup由6个队列组成
+  mSolidsBasic {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection
+  mSolidsDiffuseSpecular {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection
+  mSolidsDecal {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection
+  mSolidsNoShadowReceive {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection
+  mTransparentsUnsorted {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection
+  mTransparents {msRadixSorter1={...} msRadixSorter2={...} mOrganisationMode='' ...} Ogre::QueuedRenderableCollection