1 files changed, 91 insertions, 0 deletions
diff --git a/src/libs/engine/Buffer.h b/src/libs/engine/Buffer.h
new file mode 100644
index 00000000..13d62727
--- /dev/null
+++ b/src/libs/engine/Buffer.h
@@ -0,0 +1,91 @@
+/* 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 BUFFER_H
+#define BUFFER_H
+
+#include <cstddef>
+#include <cassert>
+#include "util/types.h"
+
+namespace Om {
+
+	
+template <typename T>
+class Buffer
+{
+public:
+	Buffer(size_t size);
+
+	void clear();
+	void set(T val, size_t start_sample);
+	void set(T val, size_t start_sample, size_t end_sample);
+	void scale(T val, size_t start_sample, size_t end_sample);
+	void copy(const Buffer<T>* src, size_t start_sample, size_t end_sample);
+	void accumulate(const Buffer<T>* src, size_t start_sample, size_t end_sample);
+	
+	void join(Buffer* buf);
+	void unjoin();
+	
+	inline T& value_at(size_t offset) { assert(offset < m_size); return m_data[offset]; }
+	
+	void prepare(samplecount nframes);
+	
+	void     filled_size(size_t size) { m_filled_size = size; }
+	size_t   filled_size() const { return m_filled_size; }
+	bool     is_joined()   const { return m_is_joined; }
+	size_t   size()        const { return m_size; }
+	T*       data()        const { return m_data; }
+
+protected:
+	enum BufferState { OK, HALF_SET_CYCLE_1, HALF_SET_CYCLE_2 };
+
+	void allocate();
+	void deallocate();
+
+	size_t      m_size;          ///< Allocated buffer size
+	size_t      m_filled_size;   ///< Usable buffer size (for MIDI ports etc)
+	bool        m_is_joined;     ///< Whether or not @ref m_data is shares with another Buffer
+	BufferState m_state;         ///< State of buffer for setting values next cycle
+	T           m_set_value;     ///< Value set by @ref set (may need to be set next cycle)
+
+	T* m_data; ///< Buffer to be returned by data() (not equal to m_local_data if joined)
+	T* m_local_data; ///< Locally allocated buffer
+};
+
+
+/** Less robust Buffer for Driver's use.
+ *
+ * Does not allocate an array by default, and allows direct setting of
+ * data pointer for zero-copy processing.
+ */
+template <typename T>
+class DriverBuffer : public Buffer<T>
+{
+public:
+	DriverBuffer(size_t size);
+	
+	void set_data(T* data);
+	
+private:
+	using Buffer<T>::m_data;
+	using Buffer<T>::m_is_joined;
+};
+
+
+} // namespace Om
+
+#endif // BUFFER_H