Render API: shader script node for custom shaders.

* Shader script node added, which stores either a link to a text datablock or
  file on disk, and has functions to add and remove sockets.
* Callback RenderEngine.update_script_node(self, node) added for render engines
  to compile the shader and update the node with new sockets.

Thanks to Thomas, Lukas and Dalai for the implementation.

3 files changed, 29 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index cd1875f848b..29e03f66bcc 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -245,6 +245,7 @@ typedef struct bNodeType {
 #define NODE_CLASS_PARTICLES		25
 #define NODE_CLASS_TRANSFORM		30
 #define NODE_CLASS_COMBINE			31
+#define NODE_CLASS_SCRIPT			32
 #define NODE_CLASS_SHADER 			40
 #define NODE_CLASS_LAYOUT			100
 
@@ -551,6 +552,7 @@ struct ShadeResult;
 #define SH_NODE_PARTICLE_INFO           168
 #define SH_NODE_TEX_BRICK				169
 #define SH_NODE_BUMP					170
+#define SH_NODE_SCRIPT					171
 
 /* custom defines options for Material node */
 #define SH_NODE_MAT_DIFF   1
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 8738251fa78..cbe3b7dd231 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -2288,6 +2288,7 @@ static void registerShaderNodes(bNodeTreeType *ttype)
 	register_node_type_sh_tex_coord(ttype);
 	register_node_type_sh_particle_info(ttype);
 	register_node_type_sh_bump(ttype);
+	register_node_type_sh_script(ttype);
 
 	register_node_type_sh_background(ttype);
 	register_node_type_sh_bsdf_anisotropic(ttype);
diff --git a/source/blender/blenkernel/intern/text.c b/source/blender/blenkernel/intern/text.c
index b9ca3c9cc63..5995e69a73a 100644
--- a/source/blender/blenkernel/intern/text.c
+++ b/source/blender/blenkernel/intern/text.c
@@ -55,12 +55,15 @@
 #include "DNA_text_types.h"
 #include "DNA_userdef_types.h"
 #include "DNA_object_types.h"
+#include "DNA_node_types.h"
+#include "DNA_material_types.h"
 
 #include "BKE_depsgraph.h"
 #include "BKE_global.h"
 #include "BKE_library.h"
 #include "BKE_main.h"
 #include "BKE_text.h"
+#include "BKE_node.h"
 
 
 #ifdef WITH_PYTHON
@@ -531,6 +534,9 @@ void BKE_text_unlink(Main *bmain, Text *text)
 	bController *cont;
 	bActuator *act;
 	bConstraint *con;
+	bNodeTree *ntree;
+	bNode *node;
+	Material *mat;
 	short update;
 
 	for (ob = bmain->object.first; ob; ob = ob->id.next) {
@@ -582,6 +588,26 @@ void BKE_text_unlink(Main *bmain, Text *text)
 			DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
 	}
 	
+	/* nodes */
+	for (mat = bmain->mat.first; mat; mat = mat->id.next) {
+		ntree = mat->nodetree;
+		for (node = ntree->nodes.first; node; node = node->next) {
+			if (node->type == SH_NODE_SCRIPT) {
+				Text *ntext = (Text *)node->id;
+				if (ntext == text) node->id = NULL;
+			}
+		}
+	}
+	
+	for (ntree = bmain->nodetree.first; ntree; ntree = ntree->id.next) {
+		for (node = ntree->nodes.first; node; node = node->next) {
+			if (node->type == SH_NODE_SCRIPT) {
+				Text *ntext = (Text *)node->id;
+				if (ntext == text) node->id = NULL;
+			}
+		}
+	}
+	
 	/* text space */
 	for (scr = bmain->screen.first; scr; scr = scr->id.next) {
 		for (area = scr->areabase.first; area; area = area->next) {