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(patented) S3TC/DXTC algorithms, but adds an option to dlopen a library module
providing functions to do so. Because it uses dlopen, it is only enabled if
USE_EXTERNAL_DXTN_LIB=1 is defined (which is only in linux-dri config, so far).
It adds support for S3TC to several DRI drivers, and adds a DRI config option to
force enabling S3TC even if the software compression/decompression is
unavailable. This may allow people to use apps that require S3TC even though
they don't have a license to implement the patented material themselves, if
those apps use precompressed textures.
Ideally we would get permission from the current holder of the patents to
implement the algorithm in Mesa, at which point the dlopen mess could go away.
Until then, this allows some to run applications they couldn't otherwise, and
hopefully will provide us with more push to get the final step of getting that
permission done.
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formats. Fix potential bug with tex env combine mode GL_DOT3_RGB/GL_DOT3_RGB_EXT and ALPHA_SCALE
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specification instead of extension specification (undefined behaviour instead of disabled blending if not enabled texture units are referenced). Fix minor signedness bug.
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principles as the refactored code already present in the R200 driver
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ARB_texture_env_combine state.
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array, texObj->Image[face][level].
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