DRW: Add instance data memory manager.

This is a special memory manager that keeps memory blocks ready to send as vbo data.
Since we loose which memory block was used each DRWShadingGroup we need to redistribute them in the same order/size to avoid to realloc each frame.
This is why DRWInstanceDatas are sorted in a list for each different data size.

1 files changed, 41 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_instance_data.h b/source/blender/draw/intern/draw_instance_data.h
new file mode 100644
index 00000000000..637c0e3cc24
--- /dev/null
+++ b/source/blender/draw/intern/draw_instance_data.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2016, 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.
+ *
+ * Contributor(s): Blender Institute
+ *
+ */
+
+/** \file draw_instance_data.h
+ *  \ingroup draw
+ */
+
+#ifndef __DRAW_INSTANCE_DATA_H__
+#define __DRAW_INSTANCE_DATA_H__
+
+typedef struct DRWInstanceData DRWInstanceData;
+typedef struct DRWInstanceDataList DRWInstanceDataList;
+
+void *DRW_instance_data_next(DRWInstanceData *idata);
+void *DRW_instance_data_get(DRWInstanceData *idata);
+DRWInstanceData *DRW_instance_data_request(
+        DRWInstanceDataList *idatalist, unsigned int attrib_size, unsigned int instance_group);
+
+void DRW_instance_data_list_reset(DRWInstanceDataList *idatalist);
+void DRW_instance_data_list_free_unused(DRWInstanceDataList *idatalist);
+void DRW_instance_data_list_resize(DRWInstanceDataList *idatalist);
+
+#endif /* __DRAW_INSTANCE_DATA_H__ */