Fix T41141, can't paint texture in cycles.

The issue is actually that creating a new image in texture paint mode
will set it always as a stencil image. Internally, the code checks if
the painted image is the same as the stencil and if it is, no painting
is done.

Solution is to expose a boolena to the operator for setting the image as
a stencil (could be an enum in th future for more uses)

Stencil UI is a bit weird here, will definitely redesign.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_material.c b/source/blender/makesrna/intern/rna_material.c
index 3c9eaf3c5db..46c5cc770b8 100644
--- a/source/blender/makesrna/intern/rna_material.c
+++ b/source/blender/makesrna/intern/rna_material.c
@@ -186,7 +186,7 @@ static void rna_Material_active_paint_texture_index_update(Main *bmain, Scene *s
 		struct bNode *node;
 		int index = 0;
 		for (node = ma->nodetree->nodes.first; node; node = node->next) {
-			if (node->typeinfo->nclass == NODE_CLASS_TEXTURE) {
+			if (node->typeinfo->nclass == NODE_CLASS_TEXTURE && node->typeinfo->type == SH_NODE_TEX_IMAGE && node->id) {
 				if (index++ == ma->paint_active_slot) {
 					break;
 				}