Workbench: StudioLight HDRI's

The Studio lights are now loaded from disk. The location is
`datafiles/studiolights` they need to be JPG for now. JPG cannot store
HDRI color range but they are clamped inside the Workbench
engine for speed reason. I didn't select JP2K as it might not be
enabled.

Users can add upto 20 HDRI files. This limitation is inside the
RNA_space.c Currently the icons are calculated when you first open the
selection box for the HDRI's. We could add them to a background
rendering later.

I added 2 test files a sky texture rendered in Cycles and an HDRI from
cloud.blender.org.

1 files changed, 73 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_studiolight.h b/source/blender/blenkernel/BKE_studiolight.h
new file mode 100644
index 00000000000..c65e9050157
--- /dev/null
+++ b/source/blender/blenkernel/BKE_studiolight.h
@@ -0,0 +1,73 @@
+/*
+ * ***** 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.
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2006-2007 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BKE_STUDIOLIGHT_H__
+#define __BKE_STUDIOLIGHT_H__
+
+/** \file BKE_studiolight.h
+ *  \ingroup bke
+ *
+ * Studio lighting for the 3dview
+ */
+
+#include "BLI_sys_types.h"
+
+#include "DNA_space_types.h"
+
+#define STUDIOLIGHT_X_POS 0
+#define STUDIOLIGHT_X_NEG 1
+#define STUDIOLIGHT_Y_POS 2
+#define STUDIOLIGHT_Y_NEG 3
+#define STUDIOLIGHT_Z_POS 4
+#define STUDIOLIGHT_Z_NEG 5
+
+enum StudioLightFlag
+{
+	STUDIOLIGHT_DIFFUSE_LIGHT_CALCULATED = (1 << 0),
+	STUDIOLIGHT_EXTERNAL_FILE            = (1 << 1),
+} StudioLightFlag;
+
+typedef struct StudioLight
+{
+	struct StudioLight *next, *prev;
+	int flag;
+	char name[FILE_MAXFILE];
+	char path[FILE_MAX];
+	int icon_id;
+	int index;
+	float diffuse_light[6][3];
+} StudioLight;
+
+void BKE_studiolight_init(void);
+void BKE_studiolight_free(void);
+struct StudioLight *BKE_studiolight_find(const char* name);
+struct StudioLight *BKE_studiolight_findindex(int index);
+unsigned int *BKE_studiolight_preview(StudioLight *sl, int icon_size);
+const struct ListBase *BKE_studiolight_listbase(void);
+void BKE_studiolight_ensure_flag(StudioLight *sl, int flag);
+
+#endif /*  __BKE_STUDIOLIGHT_H__ */