More juggling

git-svn-id: http://svn.drobilla.net/lad/grauph@15 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 105 insertions, 0 deletions

diff --git a/src/libs/engine/ConnectionBase.h b/src/libs/engine/ConnectionBase.h
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+++ b/src/libs/engine/ConnectionBase.h
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+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om 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 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Om 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef CONNECTIONBASE_H
+#define CONNECTIONBASE_H
+
+#include "util/types.h"
+#include "OutputPort.h"
+#include "Connection.h"
+
+namespace Om {
+
+class MidiMessage;
+class Port;
+template <typename T> class InputPort;
+
+
+/** A Connection with a type.
+ *
+ * \ingroup engine
+ */
+template <typename T>
+class ConnectionBase : public Connection
+{
+public:
+	ConnectionBase(OutputPort<T>* const src_port, InputPort<T>* const dst_port);
+	virtual ~ConnectionBase();
+
+	void prepare_buffers();
+
+	inline OutputPort<T>* src_port() const { return (OutputPort<T>*)m_src_port; }
+	inline InputPort<T>*  dst_port() const { return (InputPort<T>*)m_dst_port; }
+
+	/** Used by some (recursive) events to prevent double disconnections */
+	bool pending_disconnection()       { return m_pending_disconnection; }
+	void pending_disconnection(bool b) { m_pending_disconnection = b; }
+	
+	/** Get the buffer for a particular voice.
+	 * A ConnectionBase is smart - it knows the destination port respondering the
+	 * buffer, and will return accordingly (ie the same buffer for every voice
+	 * in a mono->poly connection).
+	 */
+	inline Buffer<T>* buffer(size_t voice) const;
+	
+private:
+	// Disallow copies (undefined)
+	ConnectionBase(const ConnectionBase& copy);
+	ConnectionBase& operator=(const ConnectionBase&);
+
+	Buffer<T>* m_local_buffer;  ///< Only used for poly->mono connections
+	bool       m_is_poly_to_mono;
+	size_t     m_buffer_size;
+	bool       m_pending_disconnection;
+};
+
+
+template <>
+inline Buffer<sample>* 
+ConnectionBase<sample>::buffer(size_t voice) const
+{
+	PortBase<sample>* const src_port = (PortBase<sample>*)m_src_port;
+	
+	if (m_is_poly_to_mono) {
+		return m_local_buffer;
+	} else {
+		if (src_port->poly() == 1)
+			return src_port->buffer(0);
+		else
+			return src_port->buffer(voice);
+	}
+}
+
+
+template <>
+inline Buffer<MidiMessage>*
+ConnectionBase<MidiMessage>::buffer(size_t voice) const
+{
+	// No such thing as polyphonic MIDI ports
+	assert(m_src_port->poly() == 1);
+	assert(m_dst_port->poly() == 1);
+
+	PortBase<MidiMessage>* const src_port = (PortBase<MidiMessage>*)m_src_port;
+	return src_port->buffer(0);
+}
+
+
+template class ConnectionBase<sample>;
+template class ConnectionBase<MidiMessage>;
+
+} // namespace Om
+
+#endif // CONNECTIONBASE_H