Orange branch: OpenEXR finally in Blender!

Credits go to Gernot Ziegler, who originally coded EXR support, and to
Austin  Benesh for bringing it further. Kent Mein provided a lot of code
for integrating float buffers in Blender imbuf and ImBuf API cleanup,
and provided Make and Scons and static linking.

At this moment; the EXR libraries are a *dependency*, so you cannot get
the Orange branch compiled without having OpenEXR installed. Get the
(precompiled or sources) stuff from www.openexr.com. Current default is
that the headers and lib resides in /user/local/

Several changes/additions/fixes were added:

- EXR code only supported 'half' format (16 bits per channel). I've added
  float writing, but for reading it I need tomorrow. :)
- Quite some clumsy copying of data happened in EXR code.
- cleaned up the api calls already a bit, preparing for more advanced
  support
- Zbuffers were saved 16 bits, now 32 bits
- automatic adding of .exr extensions went wrong

Imbuf:

- added proper imbuf->flags and imbuf->mall support for float buffers, it
  was created for *each* imbuf. :)
- found bugs for float buffers in scaling and flipping. Code there will
  need more checks still
- imbuf also needs to be verified to behave properly when no 32 bits
  rect exists (for saving for example)

TODO:

- support internal float images for textures, backbuf, AO probes, and
  display in Image window

Hope this commit won't screwup syncing with bf-blender... :/

1 files changed, 63 insertions, 0 deletions

diff --git a/source/blender/imbuf/intern/openexr/openexr_api.h b/source/blender/imbuf/intern/openexr/openexr_api.h
new file mode 100644
index 00000000000..882b9d98a06
--- /dev/null
+++ b/source/blender/imbuf/intern/openexr/openexr_api.h
@@ -0,0 +1,63 @@
+/**
+ * $Id$ 
+ *
+ * ***** BEGIN GPL/BL DUAL 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.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Austin Benesh.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+#ifndef _OPENEXR_API_H
+#define _OPENEXR_API_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define OPENEXR_FLOATRGB 0x1
+#define OPENEXR_ZBUF 0x2
+  
+#include <stdio.h>
+  
+  /**
+ * Test presence of OpenEXR file.
+ * @param mem pointer to loaded OpenEXR bitstream
+ */
+  
+int imb_is_a_openexr(unsigned char *mem);
+	
+short imb_save_openexr_half(struct ImBuf *ibuf, char *name, int flags);
+short imb_save_openexr_float(struct ImBuf *ibuf, char *name, int flags);
+
+struct ImBuf *imb_load_openexr(unsigned char *mem, int size, int flags);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif /* __OPENEXR_API_H */