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all formats or just those without restrictions/limitations should be returned.
We want all when validating the internalFormat parameter to
glCompressedTexImage2D but only want unrestricted formats when handling the
GL_COMPRESSED_TEXTURE_FORMATS query.
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Added _mesa_compressed_texture_size_glenum() for validating the imageSize
parameter to glCompressedTex[Sub]Image1/2/3() which does _not_ call
ctx->Driver.CompressedTextureSize() - since that could return a padded size.
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Pass the MESA_FORMAT_* token to the _mesa_compressed_row_stride(),
_mesa_compressed_texture_size() and _mesa_compressed_image_address()
functions since we want to use the driver-chosen format, not the user's
internalFormat hint.
Consolidate code related to choosing the texture format in texstoree.c
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Moved all code related to specific texture compression modes into
new texcompress_s3tc.c and texcompress_fxt1.c files (but not implemented).
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