Add BCn encoders/decoders with RDO support - #1167

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walcht wants to merge 122 commits into

KhronosGroup:mainfrom

walcht:add-BCn-decoder

Commits on May 5, 2026

Add initial BC1 decoder
walcht
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306b578

Commits on May 6, 2026

Add BC1, BC3, BC4, BC5, and BC7 decoding support to ktx extract command
walcht
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12ab662

Commits on May 7, 2026

Add BC1, BC3, BC4, BC5 and BC7 encoders and add encoder/decode tests
walcht
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d3fdab2
Merge branch 'main' into add-BCn-decoder
walcht
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67facb3

Commits on May 8, 2026

Commits on May 10, 2026

Commits on May 14, 2026

Commits on May 15, 2026

Add BC4 RDO support
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39c868c
Add BCn encoder multithreading (no RDO MT yet).
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109f301

Commits on May 18, 2026

Add RDO multithreading; remove stack-allocated struct poitners from worklaods
walcht
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c258c17

Commits on May 20, 2026

Add initial BC6HU deconding and encoding support.
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be98a77
Fix error message for BC6HU encoder format.
walcht
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f45f48c
Cleanup and refactor code; fix docstrings; add ktxBC1UnpackParams
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b5f5900

Commits on May 23, 2026

Commits on May 25, 2026

Commits on May 26, 2026

Add proper BCn arguments handling/docs for ktx create/encode
walcht
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fc7ce9c

Commits on May 27, 2026

Add RDO ultrasmooth block handling; add BC2 decoder to ktx extract
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0a7be33

Commits on Jun 3, 2026

Fix BC1 encoder; Fix encoding of non-multiple-of-4 textures; Refactor code
walcht
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192a4cf

Commits on Jun 8, 2026

Add HDR cleanup for BC6HU encoder
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a526369
Update CTS tests
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8a95806
Revert CTS tests submodule commit
walcht
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b1b862f
Merge branch 'main' into add-BCn-decoder
walcht
authored
f66cd21

Commits on Jun 9, 2026

Replace inconsistent use of size_t with uint32_t
walcht
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d5bc0d9

Commits on Jun 10, 2026

Fix Windows-related build issues
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f7b3853
Revert erroneous int to uint32_t conversion
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bc7495a
Fix BC1 RDO
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31c5147
Update CTS submodule commit pointer
walcht
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5cd60a5

Commits on Jun 11, 2026

Fix warning C4201 on Windows platforms
walcht
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5224758

Commits on Jun 12, 2026

Revert "Fix warning C4201 on Windows platforms"
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a23c016
Suppress warning C4201 on Windows platforms
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4124521
Remove xcpretty installation from MacOS CI
walcht
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9f74a0c

Commits on Jun 13, 2026

Merge branch 'KhronosGroup:main' into add-BCn-decoder
walcht
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a6799e9
Remove xcpretty and use "xcodebuild --quiet" instead
walcht
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2ed1708
Merge branch 'KhronosGroup:main' into add-BCn-decoder
walcht
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b231714
Suppress deprecated warnings on Windows platforms
walcht
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7e22b39
Add explicit uint64_t to uint32_t casts
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71d7efb
Update CTS submodule commit pointer
walcht
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5f58b7a
Fix types and update docstrings/cli docs
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0903730
Update CTS submodule commit pointer
walcht
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18f8451

Commits on Jun 14, 2026

Update CTS submodule commit pointer
walcht
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57073f2
Fix erroneous array access in RDO ultrasmooth blocks handling
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f05f76f

Commits on Jun 16, 2026

Disable strict aliasing for bc7enc_rdo dependency
walcht
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93a7f34
Merge branch 'KhronosGroup:main' into add-BCn-decoder
walcht
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ec4344c
Add CI step to upload CTS output files if CTS fails
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8b18835
Record BCn options in ktx encode
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4e0d183
Address strict aliasing violations that cause UBs
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905b224
Fix BC3 RDO decoder; Disable strict aliasing
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fd08dcd
Add BCn create RDO tests
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1e600f7
Fix ktx encode BCn threadcount option
walcht
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a5b8e8f
Increase tolerance for BCn encode-then-decode tests
walcht
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2a7a7bf

Commits on Jun 17, 2026

Fix BC1 texturetests
walcht
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29537d8

Commits on Jun 18, 2026

Commits on Jun 19, 2026

Commits on Jun 20, 2026

Clarify insert/extract block diagrams
walcht
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0e15009

Commits on Jun 21, 2026

Fix upload CTS files on failure build steps
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db54360
Handle pending data load in BCn decoder
walcht
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4e93ee3

Commits on Jun 22, 2026

Commits on Jun 23, 2026

Commits on Jul 4, 2026

Address misc review comments
walcht
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c563c84
Fix syntax error in texturetests and update CTS
walcht
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2476fb6
Merge branch 'main' into add-BCn-decoder
walcht
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41ea660
Update CTS submodule commit
walcht
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3cb6540
Add missing <algorithm> include
walcht
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a4035f2
Fix texturetests issues on Windows
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2b41ff9

Commits on Jul 16, 2026

Merge remote-tracking branch 'origin/main' into add-BCn-decoder
walcht
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d4bd76d

Commits on Jul 20, 2026

Commits on Jul 29, 2026

add BC2 decoding tests and fix documentation
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a6becea
remove BC2 SRGB testcase
walcht
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8d4c3ca
Merge branch 'main' into add-BCn-decoder
walcht
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a6d0bda
revert handle_command_output removal
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d151e45

Commits on Jul 30, 2026

add tests for RDO on UNORM BC4 and BC5 inputs
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b429b30

Commits on Aug 3, 2026

add BCn to PSNR/SSIM error messages
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9aef6a3
docs: add BCn Usage Overview section
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2dbec10

Commits on Aug 7, 2026

Merge branch 'main' into add-BCn-decoder
walcht
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cf217ca

Commits on Aug 20, 2026

address review comments
walcht
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4171dbc
Merge branch 'main' into add-BCn-decoder
walcht
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7294128
Update CTS submodule commit pointer
walcht
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cd4c591
feat: use cxxopts for ktxdiff CLI
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e2b8ed4
fix: add missing cxxopts to tests CMakeLists
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3e7dc51

Commits on Aug 21, 2026

fix: ktxdiff SFLOAT16 diff issues with small values
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cdd008b
fix: erroneously computed expectedDstByteLength
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eae29b6

Commits on Aug 24, 2026

feat: add --ignore-signed option to ktxdiff
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3109d47
fix docs; add RGBA16 input for BC6HU; fix typos
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5c37393

Commits on Aug 25, 2026

add BC6HU RGBA16 cleanup preprocessing step
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33710e7
attempt to address nan/inf issues for FLOAT16 in ktxdiff
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a4fc3e9

Commits on Aug 28, 2026

update docs
walcht
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e9f32f1
address review comments
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108aa7f

Commits on Aug 29, 2026

address review comments
walcht
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cf0b1d9