No error reported for a buffer->image copy op which exceeds target mip's extents

[DominikWitczakAMD]

Consider a copy op which:

• targets a BC1-compressed image mip of size 5x3x1
• uses start offset of 0x0x0
• has extents of 8x4x1

No error is reported by the layers in this scenario, even though for this specific use case where start offset is located at zero and the app intends to fill the whole mip with data, it should specify a copy region of size 5x3x1.

Extents of 8x4x1, despite being aligned to the compressed block size, exceeds available mip space which is an error, as per language found in section 18.4 of the spec.

[tobine]

Seems like this is VALIDATION_ERROR_18e00158 which DB claims a check for but may be incomplete.

[mark-lunarg]

@daveh-lunarg, Images! Extents! Offsets! MipLevels! Just sayin'.

[daveh-lunarg]

@mark-lunarg, Ugh. I wish there was a more expressive emoticon available.