Ludovic Marie
95db0fce9d
Horizon averaged each mip level's alpha plainly, so a cutout texture's transparent edges grew past the alpha test with every level: the cactus side's transparent border columns opened see-through slits along its corners from about 40 blocks, more than vanilla shows. The sprite array's mips now come from a port of MipmapGenerator.generateMipLevels: the texture's .mcmeta mipmap_strategy (auto: cutout when a pixel is fully transparent) and alpha_cutoff_bias, solidify or the dark fill on the base, meanLinear or darkenedAlphaBlend, and scaleAlphaToCoverage keeping every cutout level's alpha-test coverage at the base level's. tools/test_mipmap_parity.py runs vanilla's MipmapGenerator and the port on every static 16x16 block texture and a sample of item textures. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
#!/usr/bin/env python3
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"""Sprite mip levels against the pinned client's MipmapGenerator.
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Every static square block texture and a sample of item textures, with their
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.mcmeta `texture` settings (mipmap_strategy, alpha_cutoff_bias):
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VanillaMipmapOracle runs MipmapGenerator.generateMipLevels (solidify or the
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dark fill, meanLinear or darkenedAlphaBlend, scaleAlphaToCoverage for cutout
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sprites) and the `mipmap_probe` example loads the same sprites through
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`sprites::Sprites` and runs `mipmap::generate`; every level's pixels must be
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identical."""
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import json
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import struct
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try:
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from . import oracle_harness as oh
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except ImportError:
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import oracle_harness as oh
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NAME = 'mipmap-parity'
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def size(png):
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with open(png, 'rb') as f:
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head = f.read(24)
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return struct.unpack('>II', head[16:24])
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def make_input(build):
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root = oh.lab.LOCAL / 'horizon-client' / '26.3'
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textures = root / 'assets/minecraft/textures'
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names = []
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for folder, every in (('block', 1), ('item', 7)):
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for i, png in enumerate(sorted((textures / folder).glob('*.png'))):
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if i % every:
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continue
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meta = png.with_name(png.name + '.mcmeta')
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if meta.is_file() and 'animation' in json.loads(meta.read_text(encoding='utf-8')):
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continue
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w, h = size(png)
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if w != h or w & (w - 1) or w != 16:
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continue
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names.append(f'minecraft:{folder}/{png.stem}')
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path = build / 'sprites.txt'
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path.write_text('\n'.join([str(root)] + names) + '\n', encoding='utf-8')
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return path, len(names)
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if __name__ == '__main__':
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oh.differential(NAME, 'VanillaMipmapOracle', 'mipmap_probe', make_input,
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'MipmapGenerator.generateMipLevels (solidify, fillEmptyAreasWithDarkColor, meanLinear, '
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'darkenedAlphaBlend, alphaTestCoverage, scaleAlphaToCoverage) on static 16x16 block and item sprites '
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'with their .mcmeta texture settings',
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sources=[oh.lab.ROOT / 'crates/horizon-client/src/mipmap.rs',
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oh.lab.ROOT / 'crates/horizon-client/src/sprites.rs'])
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