Added IGUITabControl::insertTab, IGUITabControl::removeTab, IGUITabControl::clear and IGUITabControl::getTabAt


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Fix mipmap overwriting after manually changing automatically generated mipmaps due to changing the base texture and triggering an auto update of the mipmaps. The auto update cannot be re-enabled afterwards for now, though.

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Added 32bit support to some more of the mesh manipulator methods. Unfortunately, the cloning methods (createXXX) will require huge code duplication, so I left them unchanged so far.

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Add also a lock and write test for level 0, in order to check mipmap updates problems reported on the forum. Works all as expected.

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Fix issues with mipmap locking under OpenGL. For some reason, the texture was wrongly flipped, though correctly rendered. Test cases added and fixed for OpenGL driver, all others were correctly working.

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Sorry, outcommented GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB now as it crashes when set to true on 32-bit Linux and crashes when set to false on 64-bit Linux.
The error is always: "No doublebuffering available." followed by "Fatal error, could not get visual."


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Change GUI-focus on TAB now after the active element got the TAB-key, so the element has a chance to prevent focus-changes.


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glxChooseFBConfig needs pair parameters, I think GLX_FRAMEBUFFER_SRGB initialization was probably meant to be as in this change (crashs otherwise).


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Return 0 screenshot where targets are unsupported. D3D now supports automatic conversion to all basic color formats.

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Fix segfaults in case the image is not created. Add test which simply checks which formats are supported for screenshots.

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Change screenshot function to allow reading from other render targets as well. This is not yet fully implemented, just an API preparation for further features. Most drivers don't support the extra targets anyway. But it will be also possible to ask for different color formats, which should be possible on all drivers. Passing ECF_UNKNOWN will choose an optimal color format without the need of pixel value adaptions.

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Allow changing zbuffer enable and write in 2d override material.
Introduce NO_CLIP hints to d3d9 and opengl driver for 2d mode. Since we clip all 2d operations manually, it should be safe to tell the driver to disable clipping here. Might help on slower machines and is generally suggested by the hw vendors. We might introduce a mesh flag for this as well in the future, in order to disable clipping for larger geometry as well.

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Remove 2d render settings cache completely, as it didn't seem to speed up things, but only introduced complexity and failures. Speed up text rendering under dx again, just as before in OpenGL by skipping too many render state resets. Unified all three setRenderStates2DMode methods.

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Disable the linearize flag if no SRGB handling. It's probably not necessary then, only in very special cases. But I'm not really sure about this...

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Add flag to enable sRGB correct color calculations (e.g. blend and lighting). This allows for much better color calculations, but requires to change the explicitly defined colors in the code to be converted to linear color space.
Changed many init routines to use SIrrlichtCreationParameters struct instead of many single parameters.

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-Fixed bugs in new 'blend operation' code, the 'if' checks on EBO_NONE could never return true, so everything was set to blend

-Fixed performance bug in CTerrainSceneNode, noticed that preRenderLODCalculations() is ran every render, instead of just when LOD data is recalculated.
  This increases the frame-rate on 'Terrain Rendering Example 12' from 410fps to 1300fps on my machine.




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