Sorry, three commits in one, became difficult to untangle..

Editors Modules

* render/ module added in editors, moved the preview render code there and
  also shading related operators.
* physics/ module made more consistent with other modules. renaming files,
  making a single physics_ops.c for operators and keymaps. Also move all
  particle related operators here now.
* space_buttons/ now should have only operators relevant to the buttons
  specificially.

Updates & Notifiers

* Material/Texture/World/Lamp can now be passed to DAG_id_flush_update,
  which will go back to a callback in editors. Eventually these should
  be in the depsgraph itself, but for now this gives a unified call for
  doing updates.
* GLSL materials are now refreshed on changes. There's still various
  cases missing, 
* Preview icons now hook into this system, solving various update cases
  that were missed before.
* Also fixes issue in my last commit, where some preview would not render,
  problem is avoided in the new system.

Icon Rendering

* On systems with support for non-power of two textures, an OpenGL texture
  is now used instead of glDrawPixels. This avoids problems with icons get
  clipped on region borders. On my Linux desktop, this gives an 1.1x speedup,
  and on my Mac laptop a 2.3x speedup overall in redrawing the full window,
  with the default setup. The glDrawPixels implementation on Mac seems to
  have a lot of overhread.
* Preview icons are now drawn using proper premul alpha, and never faded so
  you can see them clearly.
* Also tried to fix issue with texture node preview rendering, globals can't
  be used with threads reliably.

1 files changed, 86 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_render.h b/source/blender/editors/include/ED_render.h
new file mode 100644
index 00000000000..be93bf92e5e
--- /dev/null
+++ b/source/blender/editors/include/ED_render.h
@@ -0,0 +1,86 @@
+/**
+ * ***** 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2005 Blender Foundation.
+ * All rights reserved.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef ED_RENDER_H
+#define ED_RENDER_H
+
+#include "DNA_vec_types.h"
+
+struct bContext;
+struct ID;
+struct Main;
+struct MTex;
+struct Render;
+struct RenderInfo;
+
+/* render_ops.c */
+
+void ED_operatortypes_render(void);
+
+/* render_shading.c */
+
+void ED_render_id_flush_update(struct Main *bmain, struct ID *id);
+
+/* render_preview.c */
+
+#define _RENDERSIZE 140
+
+/* stores rendered preview  - is also used for icons */
+typedef struct RenderInfo {
+	int pr_rectx;
+	int pr_recty;
+	short curtile, tottile, status;
+	rcti disprect;			/* storage for view3d preview rect */
+	unsigned int* rect;		
+	struct Render *re;		/* persistant render */
+} RenderInfo;
+
+/* ri->status */
+#define PR_DBASE			1
+#define PR_DISPRECT			2
+#define PR_PROJECTED		4
+#define PR_ROTATED			8
+
+/* Render the preview
+
+pr_method:
+- PR_DRAW_RENDER: preview is rendered and drawn, as indicated by called context (buttons panel)
+- PR_ICON_RENDER: the preview is not drawn and the function is not dynamic,
+  so no events are processed. Hopefully fast enough for at least 32x32 
+- PR_DO_RENDER: preview is rendered, not drawn, but events are processed for afterqueue,
+  in use for node editor now.
+*/
+
+#define PR_DRAW_RENDER	0
+#define PR_ICON_RENDER	1
+#define PR_DO_RENDER	2
+
+void ED_preview_init_dbase(void);
+void ED_preview_free_dbase(void);
+
+void ED_preview_shader_job(const struct bContext *C, void *owner, struct ID *id, struct ID *parent, struct MTex *slot, int sizex, int sizey);
+void ED_preview_icon_job(const struct bContext *C, void *owner, struct ID *id, unsigned int *rect, int sizex, int sizey);
+
+void ED_preview_draw(const struct bContext *C, void *idp, void *parentp, void *slot, rcti *rect);
+
+#endif