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Added support for Stereo framebuffers and AUX buffers (which are currently only accessible via direct OpenGL calls or shaders).
Added a creation parameter for doublebuffering.
Cleaned up the framebuffer clean methods in OpenGL.

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Change from dimension2d<s32> to dimension2d<u32> where practical.  IImage and ITexture now have unsigned dimensions, as does screen size.  This has had a significant knock-on through the code base, but it is more technically correct - the BEST KIND of correct.

GUI elements and draw2DImage methods still have and take signed dimensions, but we can look into this in future. Regression tested with the test suite and the example apps.  Note that createDevice() now takes dimension2d<u32>!

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Avoid the XVisual method when using OpenGL, because it selects improper visuals. Better signal a fail in order for the user to try other properties.

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Merged revisions 2072:2087 from 1.5 branch. Some missing inits fixed, OpenGL FBO fails better recognizeable, docs updated.

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Change IVideoDriver::writeImageToFile() to always use the IWriteFile filename rather than taking a separate extension.

Test updated.

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Add IFileSystem::createMemoryWriteFile() to allow writing to memory.
Replace CMemoryReadFile with CMemoryFile that also implement IWriteFile.
Add an IVideoDriver::writeImageToFile() overload that takes an IWriteFile.
This allows writing (e.g.) screenshots to memory, rather than directly to file.

New unit test added to test the new functionality.  Tested on Windows with VS2005 and C::B. I'll do Linux ASAP.

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Remove unused member from FPS cam.

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Merged from 1.5 branch to trunk, all changes from 2042 to 2071. cursor setVisible fix, OSX FPS cam fix, ALPHA_CHANNEL_REF fix, new method draw2dRectOutline, setOverrideFont fixes, getCollisisonPoint distance bug fix.

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Add example 20 to C::B and VC7/VC9 projects.  Fix some build issues with the light manager and example.

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Adding an optional light manager that allows hardware lights to be turned on and off before each scene node is rendered. This can be used to produce "zoned" lighting.

If a light manager is not registered, the existing behaviour (activate the closest lights to the camera) will be retained unchanged.  New example project added to demonstrate the usage, and regression tests and existing samples run.  No regression test for the light manager yet, since I am more interested in not regressing the default behaviour.

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Have all public ISceneCollisionManager.h methods take 'const type &' rather than 'type' where appropriate.

Conversely, have CSceneManager::getPickedNodeBB() take a non-const 'core::line3df& ray', so that child nodes can truncate the master ray when they get a collision.

This is an API change, so goes to the trunk only.

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Last fix to CSceneCollisionManager::getPickedNodeBB(). ;)  Efficiency improvements to reduce the number of checks, since we can only hit one face of each box, and we needn't consider boxes that are further away than the closest hit.

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Another fix to CSceneCollisionManager::getPickedNodeBB(). Ensure that the collision point with the plane of a box is actually on the box surface rather than outside it.  Retested with regression test and example 07.

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Change ray/bounding box selection so that the nearest node is determined by the actual collision point with the bounding box (or the distance to the box centre if the ray starts inside the box).  Since this is a functional change from the old behaviour, I'm only committing to the trunk.  This will be slightly slower than the old method, but should return the correct node; I consider accuracy to take priority over efficiency for collision.

tests/sceneCollisionManager.cpp has been updated, as has examples/07.Collision/main.cpp.

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