Patch #7897 Texture Nodes!

Robin (Frrr) Allen did a decent job on this, so we can also welcome him
as a member in the svn committers team to maintain it!

I do the first commit with some minor fixes:
- get Makefiles work
- fix rounding issue with tiles on unit faces
- removed UI includes from tex node

A nice doc in wiki is here:
http://wiki.blender.org/index.php/User:Frr/TexnodeManual

On the todo for Robin is:
- When using one or more Texture-input nodes, you cannot edit them by activating
  (as works now for Material nodes).
- The new "output node" option fails on the default case, when only one
  output node is active. It then shows often a blank menu. Will get fixed asap.
- When using a NodeTree-Texture as input node, the menu for 'active output'
  should not show. NodeTree should ignore other nodetrees to keep things sane
  for now.
- On a future todo is proper usage of "Dxt" and "Dyt" texture vectors for
  superior antialising of checkers/bricks.

General note; I know people are dying to get a full integrated shader system
with nodes. In theory we could merge this with Material Nodetrees... but I 
rather wait for a solid and very well thought out design proposal for this, 
also including design ideas for unifying with a shader language (GPU, CPU).
For the time being this is a nice extension of current textures. :)

1 files changed, 106 insertions, 0 deletions

diff --git a/source/blender/nodes/intern/TEX_nodes/TEX_image.c b/source/blender/nodes/intern/TEX_nodes/TEX_image.c
new file mode 100644
index 00000000000..f9477fef12b
--- /dev/null
+++ b/source/blender/nodes/intern/TEX_nodes/TEX_image.c
@@ -0,0 +1,106 @@
+/**
+ * $Id: TEX_image.c 10456 2007-04-04 13:58:12Z jesterking $
+ *
+ * ***** 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) 2006 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../TEX_util.h"
+
+static bNodeSocketType outputs[]= {
+	{ SOCK_RGBA, 0, "Image",  0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
+	{ -1, 0, "" }
+};
+
+static void colorfn(float *out, float *coord, bNode *node, bNodeStack **in, short thread)
+{
+	float x = coord[0];
+	float y = coord[1];
+	Image *ima= (Image *)node->id;
+	ImageUser *iuser= (ImageUser *)node->storage;
+	
+	if( ima ) {
+		ImBuf *ibuf = BKE_image_get_ibuf(ima, iuser);
+		if( ibuf ) {
+			float xsize, ysize;
+			float xoff, yoff;
+			int px, py;
+			
+			float *result;
+
+			xsize = ibuf->x / 2;
+			ysize = ibuf->y / 2;
+			xoff = yoff = -1;
+					
+			px = (int)( (x-xoff) * xsize );
+			py = (int)( (y-yoff) * ysize );
+		
+			if( (!xsize) || (!ysize) ) return;
+			if( !ibuf->rect_float ) IMB_float_from_rect(ibuf);
+			
+			while( px < 0 ) px += ibuf->x;
+			while( py < 0 ) py += ibuf->y;
+			while( px >= ibuf->x ) px -= ibuf->x;
+			while( py >= ibuf->y ) py -= ibuf->y;
+			
+			result = ibuf->rect_float + py*ibuf->x*4 + px*4;
+			QUATCOPY( out, result );
+		}
+	}
+};
+
+static void exec(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
+{
+	tex_output(node, in, out[0], &colorfn);
+	
+	tex_do_preview(node, out[0], data);
+}
+
+static void init(bNode* node)
+{
+   ImageUser *iuser= MEM_callocN(sizeof(ImageUser), "node image user");
+   node->storage= iuser;
+   iuser->sfra= 1;
+   iuser->fie_ima= 2;
+   iuser->ok= 1;
+}
+
+bNodeType tex_node_image= {
+	/* *next,*prev */	NULL, NULL,
+	/* type code   */	TEX_NODE_IMAGE,
+	/* name        */	"Image",
+	/* width+range */	120, 80, 300,
+	/* class+opts  */	NODE_CLASS_INPUT, NODE_PREVIEW|NODE_OPTIONS,
+	/* input sock  */	NULL,
+	/* output sock */	outputs,
+	/* storage     */	"ImageUser",
+	/* execfunc    */	exec,
+	/* butfunc     */	NULL,
+	/* initfunc    */	init,
+	/* freestoragefunc    */	node_free_standard_storage,
+	/* copystoragefunc    */	node_copy_standard_storage,
+	/* id          */	NULL
+};
+