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Remove debug output, add ifdefs for OpenGL versions not supporting ARB_occlusion_query. Add support for NV_occlusion query.

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I've finally took on Nadro's code from the forum and adapted it to overcome some restrictions of the original code. Moreover, there are some additional tweaks to make it simpler to use. A few minor things might still change in the future, but for now it looks like a proper implementation with many useful use cases. I'll come back on this in the next time when I provide an example for efficient usage of occlusion queries.

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occlusion query extension API necessary for OpenGL extension added. Not usable from Irrlicht API so far.

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Add support for vertex_array_bgra extension in OpenGL driver. This will speed up OpenGL rendering quite a lot as it skips the silly color conversion thing we have to do otherwise. Still a little clumsy implementation, but the speed gain is worth this.

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Replace raw xml char implementation with template struct in order to decouple the type from POD types. May also help for 64bit problems or changes needed there.

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Add parameter to line2d::intersectWith to allow getting intersections outside the segments (thx Yoran).


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Added some test cases for getRotationDegrees submitted by fabietto, also fixed the method to clamp values for asin to [-1,1].

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Merged revisions 3199-3217 from 1.7 branch. Fix collision problem in aabbox3d and some compile problems due to API changes. Fixed some minor mem leaks.

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Properly clean up shaders, which were not completely removed before.

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Merged revisions 3172:3197 from 1.7 branch. Some more bug fixes and doc updates from the 1.7 beta phase.

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