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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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Merged from branch 1.7, revisions 3607-3725. Fix some compilation errors, fix soname in Linux Makefile, calculation fix in vector2d class, CGUIScrollBar event handling fix.

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Fix png loader warning, also reordered transform calls such that only one test requires a late place after the read_update call. Added a test case which tests paletted png file loading and rendering.

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Change type for stored and passed lights array. In most situations, only the ISceneNode was used, and the type is not necessarily ILightSceneNode anyway. So generalize this interface and the storage arrays internally.

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Add proper compile time define for enabling usage of direct input joystick support (enabled by default)

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Add triangle selector methods to get back single selectors from meta triangle selector. Submitted by LexManos

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The code needs to be cleaned up a little more. But it seems to work properly and is the preferred solution according to MSDN. Both solutions will be kept in the code, the choice define will be moved to IrrCompileConfig later.

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Added scaling draw2dimage method to burnings video. This fix is based on code submission from Auria.

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