daniel
65f6070348
Hold keeps its picker. Also: one home for the %-fold, duration-ordered Hold travel, and a corrupt tail degrades to absent rather than fabricating one.
26 lines
1.2 KiB
C++
26 lines
1.2 KiB
C++
// trigger_seam — the shared Trigger play-span formula: how a %-length becomes the source-frame
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// span the voice plays, the overlay draws over, and the bake's window holds. One home so those
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// cannot disagree about where a Trigger note ends.
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//
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// playLengthFrames = round(clamp01(lengthFraction) * (frameCount - startFrame))
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#pragma once
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#include <cstdint>
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namespace reasampler::instrument::map {
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// `startFrame` is the effective start point (0 when absent), `lengthFraction` the EFFECTIVE one
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// — fold it through effectiveLengthFraction (play_params.h) first, or a stored-but-inert %-knob
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// shortens the span. Returns 0 for an empty post-start span and for any fraction that is not
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// above zero, NaN included; the fraction is clamped to 1.0 and the result to the span, so a
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// corrupt stored value cannot reach past the source.
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//
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// Voice::start evaluates this same clamped formula inline rather than calling it: the engine
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// does not depend on `map/`, in either direction.
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std::int64_t triggerPlayLength(double lengthFraction,
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std::int64_t frameCount,
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std::int64_t startFrame);
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} // namespace reasampler::instrument::map
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