- Update libpng to 1.6.23 (from 1.6.21)


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Vendors and 1.8 branch updated.


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 - Tests on Unix now have a short pause between switching drivers to avoid certain X11 errors.
 - Fix CEnumAttribute::getInt() which could crash  (thx @ luthyr for reporting)
 - No longer try to run tests for drivers not supported on a platform


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Several fixes for SceneNodeAnimatorCollisionResponse, based on http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=33098&p=290746
Thanks to all people who reported and to JLouisB and kinkreet for the patches:
- Gravity is now fps independent
- Values of gravity now like documented (wasn't 1 unit = 1m before, had been 1m = current frames per second, so maybe 100 units = 1m). 
  Note that jump-values for fps-camera must also change when adapting gravity!
  Several examples got adapted for new ranges
- Pausing timer now pauses animator. Also doesn't reset values anymore with pauses.
- Clones no longer have 1000 times the gravity of original animator.


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I used another patch which complicates the code somewhat, but old solution was too slow for my taste.
This should now speedup CTriangleSelector for animated meshes which call updateFromMesh regularly.
Also a fix: CTriangleSelector no longer resets it's boundingbox to 0,0,0 (that caused too large meshbuffers when a meshbuffer was not around 0), so basically also just a speedup.


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 - Deprecate CMatrix4::transformBox
 - Fix CSceneCollisionManager::getPickedNodeBB which could sometimes miss collisions.
 - Get lights and renderTargetTexture tests working again on Windows 10


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Fix: Collada reader/writer now uses wrap_p for third texture wrap value instead of invalid wrap_r (thx @Yoran for bugreport).
Seems that Irrlicht uses u,v,w, OpenGL uses s,t,r and Collada uses s,t,p
Files written by older Irrlicht can still be read (aka reader still supports wrap_r)

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- Add -U__STRICT_ANSI__ option to c::b project files to allow compiling with -std=c++11 and add an error when trying to compile with Irrlicht with __STRICT_ANSI__


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- Fixed positioning of 2D elements in OpenGL. Test drawRectOutline passed. Thanks CuteAlien for report this issue.

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- Enabled cubemaps feature in D3D9.

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- Removed test for lock->modify->unlock mipmaps (this feature is no longer supported in the engine).
- Added test for lock->modify->unlock cubemap.

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(Scene serialization had been extended in the past)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5273 dfc29bdd-3216-0410-991c-e03cc46cb475

(still can't control those cameras without cursor certainly).


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Thanks @AlexAzazel for report and test-model.


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- Fixed render targets handling in ITexture::lock for OpenGL driver (floating point, depth and stencil formats not supported).

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 * ECF_A1R5G5B5
 * ECF_R5G6B5
 * ECF_R8G8B8
 * ECF_A8R8G8B8

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- Fixed issue with cube maps filtering in OpenGL.

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- Added cube maps support to PVR file loader.
- Added support for load cube maps directly via IVideoDriver::getTexture call.

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- Get rid of some "misleading-indentation" warnings in gcc6
- Fix some compile warnings in aes which got handled as errors by some c++11 compilers.


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- Resetting Randomizer with 0 or no longer breaks it (will be set to 1). Same for other numbers for which it wasn't defined.
- Randomizer now returns range 0..randMax as documented and no longer 1..randMax as it did before. randMax got reduced by 1.
- Using now same random numbers as std::minstd_rand0. Not sure if the others were wrong, but documentation mentioned they are for mixed linear congruential generator from L'Ecuyer and as far as I can see we don't use that (that one mixes 2 calculations). We seem to use just a linear congruential generator. (I'm no expert on all this, just what it looks like from net articles).


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Probably something which will happen now a lot, would be nice if someone would update the ogre loader.


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