Move Quantizer to Machina.

git-svn-id: http://svn.drobilla.net/lad/trunk/machina@4688 a436a847-0d15-0410-975c-d299462d15a1

2 files changed, 87 insertions, 0 deletions

diff --git a/src/engine/Quantizer.hpp b/src/engine/Quantizer.hpp
new file mode 100644
index 0000000..078f5e2
--- /dev/null
+++ b/src/engine/Quantizer.hpp
@@ -0,0 +1,47 @@
+/*
+  This file is part of Raul.
+  Copyright 2007-2012 David Robillard <http://drobilla.net>
+
+  Raul is free software: you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or any later version.
+
+  Raul is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Raul.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef RAUL_QUANTIZER_HPP
+#define RAUL_QUANTIZER_HPP
+
+#include <cmath>
+#include "raul/TimeStamp.hpp"
+
+namespace Raul {
+
+/** Quantizer.
+ * \ingroup raul
+ */
+class Quantizer {
+public:
+	inline static TimeStamp quantize(TimeStamp q, TimeStamp t) {
+		assert(q.unit() == t.unit());
+		// FIXME: Precision problem?  Should probably stay in discrete domain
+		const double qd = q.to_double();
+		const double td = t.to_double();
+		return TimeStamp(t.unit(), (qd > 0) ? lrint(td / qd) * qd : td);
+	}
+
+	inline static double quantize(double q, double t) {
+		return (q > 0)
+			? lrint(t / q) * q
+			: t;
+	}
+};
+
+} // namespace Raul
+
+#endif // RAUL_QUANTIZER_HPP
diff --git a/src/engine/quantize_test.cpp b/src/engine/quantize_test.cpp
new file mode 100644
index 0000000..9cc165d
--- /dev/null
+++ b/src/engine/quantize_test.cpp
@@ -0,0 +1,40 @@
+/*
+  This file is part of Raul.
+  Copyright 2007-2012 David Robillard <http://drobilla.net>
+
+  Raul is free software: you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or any later version.
+
+  Raul is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Raul.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "raul/Quantizer.hpp"
+#include <iostream>
+
+using namespace std;
+using namespace Raul;
+
+int
+main()
+{
+	TimeStamp q(TimeUnit(TimeUnit::BEATS, 19200), 0.25);
+
+	for (double in = 0.0; in < 32; in += 0.23) {
+		TimeStamp beats(TimeUnit(TimeUnit::BEATS, 19200), in);
+
+		/*cout << "Q(" << in << ", 1/4) = "
+			<< Quantizer::quantize(q, beats) << endl;*/
+
+		if (Quantizer::quantize(q, beats).subticks() % (19200/4) != 0)
+			return 1;
+	}
+
+	return 0;
+}
+