mirror of
https://github.com/italicsjenga/vello.git
synced 2025-01-10 04:31:30 +11:00
ff59839737
* Move the vello crate to the root of the crate * Add warning that README is work in progress * Add newline in warning * Move the unlicense into the shader folder * Fixup wgsl-analyzer include paths
57 lines
1.5 KiB
WebGPU Shading Language
57 lines
1.5 KiB
WebGPU Shading Language
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
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struct TagMonoid {
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trans_ix: u32,
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// TODO: I don't think pathseg_ix is used.
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pathseg_ix: u32,
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pathseg_offset: u32,
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#ifdef full
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linewidth_ix: u32,
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path_ix: u32,
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#endif
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}
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let PATH_TAG_SEG_TYPE = 3u;
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let PATH_TAG_LINETO = 1u;
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let PATH_TAG_QUADTO = 2u;
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let PATH_TAG_CUBICTO = 3u;
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let PATH_TAG_F32 = 8u;
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let PATH_TAG_TRANSFORM = 0x20u;
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#ifdef full
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let PATH_TAG_PATH = 0x10u;
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let PATH_TAG_LINEWIDTH = 0x40u;
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#endif
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fn tag_monoid_identity() -> TagMonoid {
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return TagMonoid();
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}
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fn combine_tag_monoid(a: TagMonoid, b: TagMonoid) -> TagMonoid {
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var c: TagMonoid;
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c.trans_ix = a.trans_ix + b.trans_ix;
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c.pathseg_ix = a.pathseg_ix + b.pathseg_ix;
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c.pathseg_offset = a.pathseg_offset + b.pathseg_offset;
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#ifdef full
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c.linewidth_ix = a.linewidth_ix + b.linewidth_ix;
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c.path_ix = a.path_ix + b.path_ix;
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#endif
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return c;
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}
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fn reduce_tag(tag_word: u32) -> TagMonoid {
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var c: TagMonoid;
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let point_count = tag_word & 0x3030303u;
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c.pathseg_ix = countOneBits((point_count * 7u) & 0x4040404u);
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c.trans_ix = countOneBits(tag_word & (PATH_TAG_TRANSFORM * 0x1010101u));
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let n_points = point_count + ((tag_word >> 2u) & 0x1010101u);
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var a = n_points + (n_points & (((tag_word >> 3u) & 0x1010101u) * 15u));
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a += a >> 8u;
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a += a >> 16u;
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c.pathseg_offset = a & 0xffu;
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#ifdef full
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c.path_ix = countOneBits(tag_word & (PATH_TAG_PATH * 0x1010101u));
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c.linewidth_ix = countOneBits(tag_word & (PATH_TAG_LINEWIDTH * 0x1010101u));
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#endif
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return c;
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}
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