When textures.xml specifies format="alpha", the input is expected to be
an
8-bit greyscale PNG, and the output will be an 8-bit uncompressed
alpha-only DDS.
Add format override to CTextureProperties, to select between e.g.
GL_ALPHA
and GL_LUMINANCE for 8-bit textures.
This is needed so fonts can use the new texture system.
This was SVN commit r14015.
Replace almost all texture uses with calls to the new system.
Add some anistropic filtering to terrain textures.
Let Atlas load terrain texture previews partly-asynchronously by
polling.
Fix inefficient texture colour determination for minimap.
Remove unused global g_TerrainModified.
Change GUI texcoord computation to be less efficient but to cope with
dynamic texture changes.
Fix GUI renderer effects leaving bogus colour state.
This was SVN commit r8099.
