Work in progress commit on saving OpenEXR with all render-layers and

passes in single file. Code is currently disabled, commit is mainly to
have a nicer method of excluding OpenEXR dependency from render module.
This should compile with disabled WITH_OPENEXR too.

Reason why EXR is great to include by default in Blender is its feature
to store unlimited layers and channels, and write this tile based. I
need the feature for saving memory; while rendering tiles, all full-size
buffers for all layers and passes are kept in memory now, which can go
into 100s of MB easily.
The code I commit now doesn't allocate these buffers while rendering, but
saves the tiles to disk. In the end is it read back. Overhead for large
renders (like 300 meg buffers) is 10-15 seconds, not bad.

Two more interesting aspects:
- Blender can save such multi-layer files in the temp directory, storing
it with .blend file name and scene name. That way, on each restart of Blender,
or on switching scenes, these buffers can be read. So you always see what was
rendered last. Also great for compositing work.
- This can also become an output image type for rendering. There's plenty of
cases where you want specific layers or passes saved to disk for later use.

Anyhoo, finishing it is another days of work, and I got more urgent stuff
now!

1 files changed, 7 insertions, 19 deletions

diff --git a/source/blender/imbuf/intern/openexr/openexr_api.h b/source/blender/imbuf/intern/openexr/openexr_api.h
index a82713b6595..7572dbcb292 100644
--- a/source/blender/imbuf/intern/openexr/openexr_api.h
+++ b/source/blender/imbuf/intern/openexr/openexr_api.h
@@ -1,15 +1,12 @@
 /**
  * $Id$ 
  *
- * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ * ***** BEGIN GPL LICENSE BLOCK *****
  *
  * 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. The Blender
- * Foundation also sells licenses for use in proprietary software under
- * the Blender License.  See http://www.blender.org/BL/ for information
- * about this.
+ * 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
@@ -20,14 +17,14 @@
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  *
- * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * The Original Code is Copyright (C) 2005 Blender Foundation
  * All rights reserved.
  *
  * The Original Code is: all of this file.
  *
- * Contributor(s): Austin Benesh.
+ * Contributor(s): Austin Benesh. Ton Roosendaal.
  *
- * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ * ***** END GPL LICENSE BLOCK *****
  */
 
 #ifndef _OPENEXR_API_H
@@ -37,8 +34,8 @@
 extern "C" {
 #endif
 
-#define OPENEXR_FLOATRGB 0x1
-#define OPENEXR_ZBUF 0x2
+#define OPENEXR_FLOATRGB	0x1
+#define OPENEXR_ZBUF		0x2
   
 #include <stdio.h>
   
@@ -53,15 +50,6 @@ short	imb_save_openexr			(struct ImBuf *ibuf, char *name, int flags);
 
 struct ImBuf *imb_load_openexr		(unsigned char *mem, int size, int flags);
 
-
-void *	imb_exrtile_get_handle		(void);
-void	imb_exrtile_add_channel		(void *handle, char *channame);
-void	imb_exrtile_begin_write		(void *handle, char *filename, int width, int height, int tilex, int tiley);
-void	imb_exrtile_set_channel		(void *handle, char *channame, int xstride, int ystride, float *rect);
-void	imb_exrtile_write_channels	(void *handle, int partx, int party);
-void	imb_exrtile_close			(void *handle);
-
-
 #ifdef __cplusplus
 }
 #endif