v0.4.0

Added

• C API: new ctt-c-api crate produces static/dynamic libraries plus a hand-curated ctt.h header. Signed, attested prebuilt archives are published for Windows, macOS, and Linux on x86_64 and aarch64.
• 3D (volume) texture support end-to-end: load/encode/store 3D textures via DDS and KTX2. New CLI --volume flag stacks input files as Z slices.
• AVX-512 sRGB load/store kernels (x86_64) and NEON sRGB load/store kernels (aarch64), selected at runtime.
• Bulk f16 ↔ f32 processing kernels.
• Per-encoder option flags: --astcenc-opts, --bc7e-opts, --intel-opts, --etcpak-opts, --amd-opts accept key=val[;key=val...] strings. --help-encoder <name> lists available keys with types and docs.
• Substantially expanded astcenc settings: usage modes (Color, NormalMap with Bc5Compat/AstcDefault swizzle, SingleChannel, TwoChannel, HdrRgb, HdrRgba, Rgbm), perceptual mode, alpha-weighted error, decode_unorm8 tuning, RGBM scale, custom preset override.
• CLI integration test suite covering color/alpha conversion, containers, cubemaps, cubemap arrays, mipmaps, volumes, swizzle, supercompression, passthrough, and error paths.

Changed

• API: TargetFormat::Compressed now carries a typed encoder: Encoder enum (with per-backend settings) instead of encoder_name: Option<String>. Use Encoder::Auto for "any encoder that supports this format".
• API: parse_format signature is now parse_format(&str) -> Result<TargetFormat> — the EncoderRegistry parameter is gone; compiled-in encoders are discovered statically.
• API: Image::is_cubemap: bool replaced with Image::kind: TextureKind (Texture2D / Cubemap / Texture3D).
• API: Surface gains depth and slice_stride fields for 3D surfaces (set depth = 1, slice_stride = 0 for 2D).
• CLI --help output wraps to the terminal width.
• ASTC encoder defaults tuned for better quality out of the box.
• Passthrough path widened — more input/output combinations skip re-encoding.

Fixed

• ctt-compressonator now builds on older GCC versions.

v0.3.0

Added

• New encoder backend: ARM astcenc for ASTC (ctt-astcenc crate, encoder-astcenc feature).
• New encoder backend: AMD Compressonator for BC1–BC7 (ctt-compressonator crate, encoder-amd feature).
• New encoder backend: etcpak for ETC/EAC and a subset of BCn (ctt-etcpak crate, encoder-etcpak feature).
• High-level library API: ctt::convert with ConvertSettings, plus crate-level documentation and examples covering the end-to-end pipeline.
• KTX and DDS input support: existing compressed textures can now be re-encoded or transcoded, not just raw PNG/JPEG/etc.
• KTX2 supercompression: optional zstd and zlib compression of the payload (--zstd / --zlib).
• Color space and alpha mode conversion: sRGB↔linear and straight↔premultiplied conversions are modeled in the pipeline and triggered automatically when source and target disagree.
• Mipmap generation.
• NPOT (non-power-of-two) textures are now handled correctly throughout the pipeline, including mipmap generation.
• Profiling scopes via the profiling crate across the pipeline.

Changed

• Core transformation pipeline rewritten around a conversion graph and typed transform nodes, unifying how format conversion, color space conversion, alpha handling, swizzling, mipmapping, and compression are scheduled.
• Mipmap downsampling now uses fast_image_resize; the default filter is box.
• sRGB encode/decode uses an approximate OETF/EOTF on the hot path, significantly speeding up loading and conversion of sRGB images.
• Output handling reworked: clearer container selection from extension, better diagnostics, and cleaner layering between the container writers and the pipeline.

Removed

• Dropped the Intel ISPC Texture Compressor's built-in ASTC path in favor of astcenc, which produces higher-quality output.

v0.2.0

What's Changed

• Update Cargo.lock by @renovate[bot] in #4
• Update GitHub Artifact Actions (major) by @renovate[bot] in #3
• Update actions/checkout action to v6 by @renovate[bot] in #2
• Update Cargo.lock by @renovate[bot] in #5
• Unify with repository procedures by @cwfitzgerald in #6
• Update Cargo.lock by @renovate[bot] in #7
• Update Cargo.lock by @renovate[bot] in #8
• Update Cargo.lock by @renovate[bot] in #15
• Prebuilt binaries by @cwfitzgerald in #16
• Attest binary builds by @cwfitzgerald in #17

New Contributors

• @renovate[bot] made their first contribution in #4
• @cwfitzgerald made their first contribution in #6

Full Changelog: v0.1.0...v0.2.0

v0.1.0

Initial release of ctt

Full Changelog: https://github.com/cwfitzgerald/ctt/commits/v0.1.0