gearmulator

commit 83b07d2ad8f4821e38c84cc8cb9d5b827dcd790d
parent ccaca06686ae6a30b7d148907865fa24e23d4d19
Author: dsp56300 <dsp56300@users.noreply.github.com>
Date:   Sun, 29 Sep 2024 01:09:25 +0200

create func to interpolate two wavetables, needed in the future for dsp preview and maybe vor visualization

Diffstat:
M
source/xtLib/xtState.cpp
 | 
21
+++++++++++++++++++++
M
source/xtLib/xtState.h
 | 
1
+

2 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/source/xtLib/xtState.cpp b/source/xtLib/xtState.cpp
@@ -760,6 +760,27 @@ namespace xt
 		return sysex;
 	}
 
+	WaveData State::createinterpolatedTable(const WaveData& _a, const WaveData& _b, uint16_t _indexA, uint16_t _indexB, uint16_t _indexTarget)
+	{
+		assert(_indexB > _indexA);
+		assert(_indexTarget >= _indexA && _indexTarget <= _indexB);
+
+		xt::WaveData result;
+
+		const auto indexDelta = _indexB - _indexA;
+		const auto targetDelta = _indexTarget - _indexA;
+
+		for(size_t i=0; i<_a.size(); ++i)
+		{
+			auto d = _b[i] - _a[i];
+			d *= targetDelta;
+			d /= indexDelta;
+			d += _a[i];
+			result[i] = static_cast<int8_t>(d);
+		}
+		return result;
+	}
+
 	void State::parseTableData(TableData& _table, const SysEx& _sysex)
 	{
 		constexpr uint32_t off = 7;
diff --git a/source/xtLib/xtState.h b/source/xtLib/xtState.h
@@ -86,6 +86,7 @@ namespace xt
 
 		static void parseWaveData(WaveData& _wave, const SysEx& _sysex);
 		static SysEx createWaveData(const WaveData& _wave, uint16_t _waveIndex, bool _preview);
+		static WaveData createinterpolatedTable(const WaveData& _a, const WaveData& _b, uint16_t _indexA, uint16_t _indexB, uint16_t _indexTarget);
 
 		static void parseTableData(TableData& _table, const SysEx& _sysex);
 		static SysEx createTableData(const TableData& _table, uint32_t _tableIndex, bool _preview);