From 47adc0e3e96b7845f71fc1ce029833908fe8d8dc Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 8 Feb 2021 18:42:44 +0100
Subject: WIP: PoC on stereo map feature.

---
 src/drumgizmo.cc | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'src/drumgizmo.cc')

diff --git a/src/drumgizmo.cc b/src/drumgizmo.cc
index ca91c12..a67dace 100644
--- a/src/drumgizmo.cc
+++ b/src/drumgizmo.cc
@@ -185,6 +185,63 @@ bool DrumGizmo::run(size_t pos, sample_t *samples, size_t nsamples)
 	//
 	// Write audio
 	//
+	if(settings.enable_stereo_mode)
+	{
+		static sample_t left[4096];
+		static sample_t right[4096];
+		std::memset(left, 0, sizeof(left));
+		std::memset(right, 0, sizeof(right));
+		for(size_t c = 0; c < kit.channels.size(); ++c)
+		{
+			const auto& channel = kit.channels[c];
+			(void)channel;
+			const auto pan = channel.stereo_panning * 0.5 + 0.5; // -> [0; 1]
+			const auto scale = channel.stereo_volume;
+			static sample_t buf[4096];
+			std::memset(buf, 0, sizeof(buf));
+			getSamples(c, pos, buf, nsamples);
+			for(auto i = 0u; i < nsamples; ++i)
+			{
+				left[i] += buf[i] * pan * scale;
+				right[i] += buf[i] * (1 - pan) * scale;
+			}
+		}
+
+		for(size_t c = 0; c < kit.channels.size(); ++c)
+		{
+			sample_t *buf = samples;
+			bool internal = false;
+			if(oe.getBuffer(c))
+			{
+				buf = oe.getBuffer(c);
+				internal = true;
+			}
+
+			if(buf)
+			{
+				if(c == 0) // left channel
+				{
+					memcpy(buf, left, nsamples * sizeof(sample_t));
+				}
+				else if(c == 1) // right channel
+				{
+					memcpy(buf, right, nsamples * sizeof(sample_t));
+				}
+				else
+				{
+					std::memset(buf, 0, nsamples * sizeof(sample_t));
+				}
+
+				if(!internal)
+				{
+					oe.run(c, samples, nsamples);
+				}
+			}
+		}
+
+	}
+	else
+	{
 	if(!enable_resampling || ratio == 1.0)
 	{
 		// No resampling needed
@@ -250,6 +307,7 @@ bool DrumGizmo::run(size_t pos, sample_t *samples, size_t nsamples)
 			}
 		}
 	}
+	}
 
 	ie.post();
 	oe.post(nsamples);
-- 
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