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38 lines
885 B
GLSL
38 lines
885 B
GLSL
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
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// Common data structures and functions for the draw tag stream.
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struct DrawMonoid {
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uint path_ix;
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uint clip_ix;
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};
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DrawMonoid tag_monoid_identity() {
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return DrawMonoid(0, 0);
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}
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DrawMonoid combine_tag_monoid(DrawMonoid a, DrawMonoid b) {
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DrawMonoid c;
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c.path_ix = a.path_ix + b.path_ix;
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c.clip_ix = a.clip_ix + b.clip_ix;
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return c;
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}
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#ifdef Element_size
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DrawMonoid map_tag(uint tag_word) {
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switch (tag_word) {
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case Element_FillColor:
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case Element_FillLinGradient:
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case Element_FillImage:
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return DrawMonoid(1, 0);
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case Element_BeginClip:
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// TODO: endclip should be (0, 1), ie not generate a path. But for now
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// we generate a dummy path.
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case Element_EndClip:
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return DrawMonoid(1, 1);
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default:
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return DrawMonoid(0, 0);
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}
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}
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#endif
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