55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
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// nisps/modes/voice_space.hpp — Voice-space binding helpers.
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//
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// In this codebase the *voice-space code* (the lambda that maps NN outputs
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// to engine state fields) lives INSIDE each engine — see e.g.
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// `PAFSynthEngine::apply_quad_detune` etc. Engines expose a
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// `set_voice_space(EngineT::VoiceSpace)` method to switch which mapping is
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// active; the next `set_params(span<float>)` call routes through the
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// selected voice space.
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//
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// The mode layer therefore only needs to:
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// 1. Tell the engine which voice space is active.
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// 2. Surface the voice-space NAMES (for UI dropdowns / schema parity).
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//
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// `VoiceSpaceEntry` is a thin value used by `ParamSchema::voice_spaces` and
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// for static introspection (e.g. matching schema names against
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// `EngineT::kVoiceSpaceNames`). We keep it constexpr-friendly.
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#pragma once
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#include <array>
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#include <cstddef>
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#include <span>
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#include <string_view>
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namespace nisps {
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struct VoiceSpaceEntry {
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std::string_view name;
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std::size_t index;
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};
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// Build a constexpr list of {name, index} from the engine's static name table.
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template <typename EngineT>
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constexpr auto make_voice_space_entries() noexcept {
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constexpr std::size_t N = EngineT::kVoiceSpaceCount;
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std::array<VoiceSpaceEntry, N> entries{};
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for (std::size_t i = 0u; i < N; ++i) {
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entries[i] = VoiceSpaceEntry{EngineT::kVoiceSpaceNames[i], i};
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}
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return entries;
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}
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// Look up a voice-space index by name on an engine. Returns SIZE_MAX if not
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// found. Modes use this to translate schema voice-space strings to the
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// engine's enum index when loading a default.
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template <typename EngineT>
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constexpr std::size_t find_voice_space(std::string_view name) noexcept {
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for (std::size_t i = 0u; i < EngineT::kVoiceSpaceCount; ++i) {
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if (EngineT::kVoiceSpaceNames[i] == name) return i;
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}
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return static_cast<std::size_t>(-1);
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}
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} // namespace nisps
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