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This helper function is used during mipmap generation to prepare space
for the destination mipmap levels.
This improves/fixes two things:
1. If the texture object was created with glTexStorage2D, calling
_mesa_TexImage2D() to allocate the new image would generate
INVALID_OPERATION since the texture is marked as immutable.
2. _mesa_TexImage2D() always frees any existing texture image memory
before allocating new memory. That's inefficient if the existing
image is the right size already.
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
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It was only used by the old tdfx driver, IIRC.
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Now that we can zero-copy generate the mipmaps into brand new
glTexImage()-generated storage using MapTextureImage(), we no longer
need to allocate image->Data in mipmap generate. This requires
deleting the drivers' old overrides of the miptree tracking after
calling _mesa_generate_mipmap at the same time, or the drivers
promptly lose our newly-generated data.
Reviewed-by: Eric Anholt <[email protected]>
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Was used by no other code.
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(cherry picked from commit c22d9152e33792ea58426c53bc9b96bf552b0b44)
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(cherry picked from commit c3395f4473c8fdf75d04c0dd72e687bc8d8127a7)
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mipmap.c file.
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