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.

1 files changed, 32 insertions, 0 deletions

diff --git a/source/blender/editors/space_node/drawnode.c b/source/blender/editors/space_node/drawnode.c
index 420f0f1c413..f25fed3f6bb 100644
--- a/source/blender/editors/space_node/drawnode.c
+++ b/source/blender/editors/space_node/drawnode.c
@@ -1384,6 +1384,34 @@ static void node_shader_buts_glossy(uiLayout *layout, bContext *UNUSED(C), Point
 	uiItemR(layout, ptr, "distribution", 0, "", ICON_NONE);
 }
 
+static void node_shader_buts_script(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
+{
+	uiLayout *row;
+
+	row = uiLayoutRow(layout, FALSE);
+	uiItemR(row, ptr, "mode", UI_ITEM_R_EXPAND, NULL, ICON_NONE);
+
+	row = uiLayoutRow(layout, TRUE);
+
+	if(RNA_enum_get(ptr, "mode") == NODE_SCRIPT_INTERNAL)
+		uiItemR(row, ptr, "script", 0, "", ICON_NONE);
+	else
+		uiItemR(row, ptr, "filepath", 0,"", ICON_NONE);
+
+	uiItemO(row, "", ICON_FILE_REFRESH, "node.shader_script_update");
+}
+
+static void node_shader_buts_script_details(uiLayout *layout, bContext *C, PointerRNA *ptr)
+{
+	uiItemS(layout);
+
+	node_shader_buts_script(layout, C, ptr);
+
+	/* not implemented yet
+	if(RNA_enum_get(ptr, "mode") == NODE_SCRIPT_EXTERNAL)
+		uiItemR(layout, ptr, "use_auto_update", 0, NULL, ICON_NONE);*/
+}
+
 /* only once called */
 static void node_shader_set_butfunc(bNodeType *ntype)
 {
@@ -1467,6 +1495,10 @@ static void node_shader_set_butfunc(bNodeType *ntype)
 		case SH_NODE_BSDF_GLASS:
 			ntype->uifunc = node_shader_buts_glossy;
 			break;
+		case SH_NODE_SCRIPT:
+			ntype->uifunc = node_shader_buts_script;
+			ntype->uifuncbut = node_shader_buts_script_details;
+			break;
 	}
 }