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| Question about glDrawRangeElements() function ? http://horde3d.org/forums/viewtopic.php?f=1&t=1015 |
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| Author: | davylew [ 25.11.2009, 16:55 ] |
| Post subject: | Question about glDrawRangeElements() function ? |
I've been reading the code of Horde3d for a few days. I've noticed that the glDrawRangeElements() in drawModels(), glDrawRangeElements( GL_TRIANGLES, meshNode->getVertRStart(), meshNode->getVertREnd(), meshNode->getBatchCount(), curGeoRes->_16BitIndices ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (char *)0 + meshNode->getBatchStart() * (curGeoRes->_16BitIndices ? sizeof( short ) : sizeof( int )) ); How dose "(char *)0 + meshNode->getBatchStart() *(curGeoRes->_16BitIndices ? sizeof( short ) : sizeof( int ))" mean ? Is this code get a pointer to Triangle Indices? Thx |
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| Author: | swiftcoder [ 25.11.2009, 17:04 ] |
| Post subject: | Re: Question about glDrawRangeElements() function ? |
It is an offset into the vertex buffer object containing the indices. If one were to use vertex arrays instead, one would pass a pointer to the start of the indices, but since we use vertex buffer objects, it has to be an offset from the start of the buffer. |
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