Cycles: memory usage report

This commit adds memory usage information while rendering.

It reports memory used by device, meaning:

- For CPU it'll report real memory consumption
- For GPU rendering it'll report GPU memory consumption, but it'll
  also mean the same memory is used from host side.

This information displays information about memory requested by Cycles,
not memory really allocated on a device. Real memory usage might be
higher because of memory fragmentation or optimistic memory allocator.

There's really nothing we can do against this.

Also in contrast with blender internal's render cycles memory usage
does not include memory used by scene, only memory needed by cycles
itself will be displayed. So don't freak out if memory usage reported
by cycles would be much lower than blender internal's.

This commit also adds RenderEngine.update_memory_stats callback which
is used to tell memory consumption from external engine to blender.
This information is used to generate information line after rendering
is finished.

1 files changed, 53 insertions, 0 deletions

diff --git a/intern/cycles/util/util_stats.h b/intern/cycles/util/util_stats.h
new file mode 100644
index 00000000000..405c81a1e1f
--- /dev/null
+++ b/intern/cycles/util/util_stats.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2012, Blender Foundation.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UTIL_STATS_H__
+#define __UTIL_STATS_H__
+
+#include "util_thread.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Stats {
+public:
+	Stats() : lock(), mem_used(0), mem_peak(0) {}
+
+	void mem_alloc(size_t size) {
+		lock.lock();
+
+		mem_used += size;
+		if(mem_used > mem_peak)
+			mem_peak = mem_used;
+
+		lock.unlock();
+	}
+
+	void mem_free(size_t size) {
+		lock.lock();
+		mem_used -= size;
+		lock.unlock();
+	}
+
+	spin_lock lock;
+	size_t mem_used;
+	size_t mem_peak;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __UTIL_STATS_H__ */