Add mipmapping support in the OpenGL rendering #2680
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MIP maps (also known as mipmaps), are bitmaps grouped together and associated with a texture to increase runtime rendering quality and performance. Each bitmap image in the MIP map is a version of the main bitmap image, but at a reduced level of detail from the main image. (taken from the Actionscript developer guide)
This PR generates Mipmaps from a texture, plus sets a specific lod bias specified in the
SamplerState