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iris: fix layer calculation for TEXTURE_3D ReadPixels() on mip-level>0

Yevhenii Kharchenko requested to merge fix/iris-3d-texture-layers-num-2 into master

Fixes assert when ReadPixels() called to read from FBO to GL_PIXEL_PACK_BUFFER, on mip-level > 0, since num_layers wasn't properly calculated with mip-level.

The logic of fix is similar to one in 'update_image_surface' function of i965 driver, which is introduced in commit f9fd0cf4, and called in similar circumstances.

Closes: Fixes:

Signed-off-by: Yevhenii Kharchenko yevhenii.kharchenko@globallogic.com

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