Christmas coding work!

********* Node editor work:

- To enable Nodes for Materials, you have to set the "Use Nodes"
  button, in the new Material buttons "Nodes" Panel or in header
  of the Node editor. Doing this will disable Material-Layers.

- Nodes now execute materials ("shaders"), but still only using the
  previewrender code.

- Nodes have (optional) previews for rendered images.

- Node headers allow to hide buttons and/or preview image

- Nodes can be dragged larger/smaller (right-bottom corner)

- Nodes can be hidden (minimized) with hotkey H

- CTRL+click on an Input Socket gives a popup with default values.

- Changing Material/Texture or Mix node will adjust Node title.

- Click-drag outside of a Node changes cursor to "Knife' and allows to
  draw a rect where to cut Links.

- Added new node types RGBtoBW, Texture, In/Output, ColorRamp

- Material Nodes have options to ouput diffuse or specular, or to use
  a negative normal. The input socket 'Normal' will force the material
  to use that normal, otherwise it uses the normal from the Material
  that has the node tree.

- When drawing a link between two not-matching sockets, Blender inserts
  a converting node (now only for value/rgb combos)

- When drawing a link to an input socket that's already in use, the
  old link will either disappear or flip to another unused socket.

- A click on a Material Node will activate it, and show all its settings
  in the Material Buttons. Active Material Nodes draw the material icon
  in red.

- A click on any node will show its options in the Node Panel in the
  Material buttons.

- Multiple Output Nodes can be used, to sample contents of a tree, but
  only one Output is the real one, which is indicated in a different
  color and red material icon.

- Added ThemeColors for node types

- ALT+C will convert existing Material-Layers to Node... this currently
  only adds the material/mix nodes and connects them. Dunno if this is
  worth a lot of coding work to make perfect?

- Press C to call another "Solve order", which will show all possible
  cyclic conflicts (if there are).

- Technical: nodes now use "Type" structs which define the
  structure of nodes and in/output sockets. The Type structs store all
  fixed info, callbacks, and allow to reconstruct saved Nodes to match
  what is required by Blender.

- Defining (new) nodes now is as simple as filling in a fixed
  Type struct, plus code some callbacks. A doc will be made!

- Node preview images are by default float

********* Icon drawing:

- Cleanup of how old icons were implemented in new system, making
  them 16x16 too, correctly centered *and* scaled.

- Made drawing Icons use float coordinates

- Moved BIF_calcpreview_image() into interface_icons.c, renamed it
  icon_from_image(). Removed a lot of unneeded Imbuf magic here! :)

- Skipped scaling and imbuf copying when icons are OK size


********* Preview render:

- Huge cleanup of code....

- renaming BIF_xxx calls that only were used internally

- BIF_previewrender() now accepts an argument for rendering method,
  so it supports icons, buttonwindow previewrender and node editor

- Only a single BIF_preview_changed() call now exists, supporting all
  signals as needed for buttos and node editor


********* More stuff:

- glutil.c, glaDrawPixelsSafe() and glaDrawPixelsTex() now accept format
  argument for GL_FLOAT rects

- Made the ColorBand become a built-in button for interface.c
  Was a load of cleanup work in buttons_shading.c...

- removed a load of unneeded glBlendFunc() calls

- Fixed bug in calculating text length for buttons (ancient!)

2 files changed, 114 insertions, 11 deletions

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index bf6928b7b20..295ebc15a68 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -76,6 +76,7 @@
 #include "DNA_meshdata_types.h"
 #include "DNA_modifier_types.h"
 #include "DNA_nla_types.h"
+#include "DNA_node_types.h"
 #include "DNA_object_types.h"
 #include "DNA_object_force.h"
 #include "DNA_object_fluidsim.h" // NT
@@ -1205,6 +1206,61 @@ static void test_pointer_array(FileData *fd, void **mat)
 	}
 }
 
+/* ************ READ NODE TREE *************** */
+
+/* ntree is not NULL */
+static void lib_link_nodetree(FileData *fd, ID *id, bNodeTree *ntree)
+{
+	bNode *node;
+	
+	for(node= ntree->nodes.first; node; node= node->next)
+		node->id= newlibadr_us(fd, id->lib, node->id);
+}
+
+static bNodeTree *direct_link_nodetree(FileData *fd, bNodeTree *ntree)
+{
+	/* note: writing and reading goes in sync, for speed */
+	if(ntree) {
+		ntree= newdataadr(fd, ntree);
+		
+		if(ntree) {
+			bNode *node;
+			bNodeSocket *sock;
+			bNodeLink *link;
+			
+			ntree->init= 0;		/* to set callbacks */
+			ntree->data= NULL;	/* safety only */
+			
+			link_list(fd, &ntree->nodes);
+			for(node= ntree->nodes.first; node; node= node->next) {
+				node->storage= newdataadr(fd, node->storage);
+				link_list(fd, &node->inputs);
+				link_list(fd, &node->outputs);
+			}
+			link_list(fd, &ntree->links);
+			
+			/* and we connect the rest */
+			for(node= ntree->nodes.first; node; node= node->next) {
+				node->preview= NULL;
+				node->lasty= 0;
+				for(sock= node->inputs.first; sock; sock= sock->next)
+					sock->link= newdataadr(fd, sock->link);
+			}
+			for(link= ntree->links.first; link; link= link->next) {
+				link->fromnode= newdataadr(fd, link->fromnode);
+				link->tonode= newdataadr(fd, link->tonode);
+				link->fromsock= newdataadr(fd, link->fromsock);
+				link->tosock= newdataadr(fd, link->tosock);
+			}
+			/* right after read file, the save-undo will need it */
+			/* verify also does a full type checking. This is relative slow... so we
+				 might move this later to the do_versions, and put ntreeInitTypes() only here */
+			ntreeVerifyTypes(ntree);
+		}
+	}
+	return ntree;
+}
+
 /* ************ READ PACKEDFILE *************** */
 
 static PackedFile *direct_link_packedfile(FileData *fd, PackedFile *oldpf)
@@ -1993,7 +2049,7 @@ static void lib_link_material(FileData *fd, Main *main)
 
 			ma->ipo= newlibadr_us(fd, ma->id.lib, ma->ipo);
 			ma->group= newlibadr_us(fd, ma->id.lib, ma->group);
-
+			
 			for(a=0; a<MAX_MTEX; a++) {
 				mtex= ma->mtex[a];
 				if(mtex) {
@@ -2005,7 +2061,10 @@ static void lib_link_material(FileData *fd, Main *main)
 			
 			for (ml=ma->layers.first; ml; ml=ml->next)
 				ml->mat= newlibadr_us(fd, ma->id.lib, ml->mat);
-				
+			
+			if(ma->nodetree)
+				lib_link_nodetree(fd, &ma->id, ma->nodetree);
+			
 			ma->id.flag -= LIB_NEEDLINK;
 		}
 		ma= ma->id.next;
@@ -2026,7 +2085,8 @@ static void direct_link_material(FileData *fd, Material *ma)
 	direct_link_scriptlink(fd, &ma->scriptlink);
 	
 	link_list(fd, &ma->layers);
-
+	
+	ma->nodetree= direct_link_nodetree(fd, ma->nodetree);
 }
 
 /* ************ READ MESH ***************** */
@@ -2994,6 +3054,13 @@ void lib_link_screen_restore(Main *newmain, Scene *curscene)
 
 					ssound->sound= restore_pointer_by_name(newmain, (ID *)ssound->sound, 1);
 				}
+				else if(sl->spacetype==SPACE_NODE) {
+					SpaceNode *snode= (SpaceNode *)sl;
+					
+					snode->nodetree= NULL;
+					snode->block= NULL;
+					snode->flag |= SNODE_DO_PREVIEW;
+				}
 			}
 			sa= sa->next;
 		}
@@ -3088,6 +3155,7 @@ static void direct_link_screen(FileData *fd, bScreen *sc)
 				SpaceNode *snode= (SpaceNode *)sl;
 				snode->nodetree= NULL;
 				snode->block= NULL;
+				snode->flag |= SNODE_DO_PREVIEW;
 			}
 		}
 
@@ -5115,11 +5183,8 @@ static void do_versions(FileData *fd, Library *lib, Main *main)
 				ma->strand_sta= ma->strand_end= 1.0f;
 				ma->mode |= MA_TANGENT_STR;
 			}
-			/* remove this test before 2.40 too! pad is set to denote check was done */
-			if(ma->pad==0) {
-				if(ma->mode & MA_TRACEBLE) ma->mode |= MA_SHADBUF;
-				ma->pad= 1;
-			}
+			if(ma->mode & MA_TRACEBLE) ma->mode |= MA_SHADBUF;
+
 			/* orange stuff, so should be done for 2.40 too */
 			if(ma->layers.first==NULL) {
 				ma->ml_flag= ML_RENDER;
@@ -5379,6 +5444,13 @@ static void expand_material(FileData *fd, Main *mainvar, Material *ma)
 		if(ml->mat)
 			expand_doit(fd, mainvar, ml->mat);
 	}
+	
+	if(ma->nodetree) {
+		bNode *node;
+		for(node= ma->nodetree->nodes.first; node; node= node->next)
+			if(node->id)
+				expand_doit(fd, mainvar, node->id);
+	}
 }
 
 static void expand_lamp(FileData *fd, Main *mainvar, Lamp *la)
diff --git a/source/blender/blenloader/intern/writefile.c b/source/blender/blenloader/intern/writefile.c
index 23d9d04ce3b..704215aaa7e 100644
--- a/source/blender/blenloader/intern/writefile.c
+++ b/source/blender/blenloader/intern/writefile.c
@@ -124,6 +124,7 @@ Important to know is that 'streaming' has been added to files, for Blender Publi
 #include "DNA_material_types.h"
 #include "DNA_modifier_types.h"
 #include "DNA_nla_types.h"
+#include "DNA_node_types.h"
 #include "DNA_object_types.h"
 #include "DNA_object_force.h"
 #include "DNA_oops_types.h"
@@ -153,6 +154,7 @@ Important to know is that 'streaming' has been added to files, for Blender Publi
 #include "BKE_global.h" // for G
 #include "BKE_library.h" // for  set_listbasepointers
 #include "BKE_main.h" // G.main
+#include "BKE_node.h"
 #include "BKE_packedFile.h" // for packAll
 #include "BKE_screen.h" // for waitcursor
 #include "BKE_scene.h" // for do_seq
@@ -317,7 +319,7 @@ static void writestruct(WriteData *wd, int filecode, char *structname, int nr, v
 	BHead bh;
 	short *sp;
 
-	if(adr==0 || nr==0) return;
+	if(adr==NULL || nr==0) return;
 
 	/* init BHead */
 	bh.code= filecode;
@@ -326,7 +328,7 @@ static void writestruct(WriteData *wd, int filecode, char *structname, int nr, v
 
 	bh.SDNAnr= dna_findstruct_nr(wd->sdna, structname);
 	if(bh.SDNAnr== -1) {
-		printf("error: can't find SDNA code %s\n", structname);
+		printf("error: can't find SDNA code <%s>\n", structname);
 		return;
 	}
 	sp= wd->sdna->structs[bh.SDNAnr];
@@ -360,6 +362,33 @@ static void writedata(WriteData *wd, int filecode, int len, void *adr)	/* do not
 	if(len) mywrite(wd, adr, len);
 }
 
+/* this is only direct data */
+static void write_nodetree(WriteData *wd, bNodeTree *ntree)
+{
+	bNode *node;
+	bNodeSocket *sock;
+	bNodeLink *link;
+	
+	writestruct(wd, DATA, "bNodeTree", 1, ntree);
+	
+	/* for link_list() speed, we write per list */
+	
+	for(node= ntree->nodes.first; node; node= node->next)
+		writestruct(wd, DATA, "bNode", 1, node);
+
+	for(node= ntree->nodes.first; node; node= node->next) {
+		if(node->storage) 
+			writestruct(wd, DATA, node->typeinfo->storagename, 1, node->storage);
+		for(sock= node->inputs.first; sock; sock= sock->next)
+			writestruct(wd, DATA, "bNodeSocket", 1, sock);
+		for(sock= node->outputs.first; sock; sock= sock->next)
+			writestruct(wd, DATA, "bNodeSocket", 1, sock);
+	}
+	
+	for(link= ntree->links.first; link; link= link->next)
+		writestruct(wd, DATA, "bNodeLink", 1, link);
+}
+
 static void write_scriptlink(WriteData *wd, ScriptLink *slink)
 {
 	writedata(wd, DATA, sizeof(void *)*slink->totscript, slink->scripts);
@@ -1014,7 +1043,9 @@ static void write_materials(WriteData *wd, ListBase *idbase)
 			
 			for (ml=ma->layers.first; ml; ml=ml->next)
 				writestruct(wd, DATA, "MaterialLayer", 1, ml);
-
+			
+			if(ma->nodetree) 
+				write_nodetree(wd, ma->nodetree);
 		}
 		ma= ma->id.next;
 	}