Fix array stride calculation for small mip levels #6
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The next mipmap level of a 16x4 texture does not take up 1/4 the number of bytes when using block compression. It takes up half the number of bytes, because 8x2 textures are stored as two blocks (total dimensions of 8x4 where half of those stored pixels are ignored). This is more than the "min mipmap size" so the calculation would give an incorrect result previously. Fixes SiegeEngine#5.
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This works for me, as far as I can tell. However I feel a bit uneasy about the fact that the
public fn get_array_stride()never takes the linear_size into account now, while it did so previously throughself.get_main_texture_size(). Maybe that's alright though? I don't have a lot of different dds files to see if it breaks anything and don't really know the details of the format well enough, and there are no unit or integration tests as far as I can tell.The next mipmap level of a 16x4 texture does not take up 1/4 the number
of bytes when using block compression. It takes up half the number of
bytes, because 8x2 textures are stored as two blocks (total dimensions
of 8x4 where half of those stored pixels are ignored). This is more than
the "min mipmap size" so the calculation would give an incorrect result
previously.
Fixes #5.