Commit: 231e894a7e7ccc19eafd3ff074e51623d5f9ffca
Author: Antonio Vazquez
Date:   Sat Jul 14 13:41:17 2018 +0200
Branches: greasepencil-object
https://developer.blender.org/rB231e894a7e7ccc19eafd3ff074e51623d5f9ffca

Update preview panel for grease pencil materials

Also some test changes to preview_grease_pencil.blend file

===================================================================

M       release/datafiles/preview_grease_pencil.blend
M       source/blender/editors/render/render_preview.c

===================================================================

diff --git a/release/datafiles/preview_grease_pencil.blend 
b/release/datafiles/preview_grease_pencil.blend
index 80b136745b0..875fe64412c 100644
Binary files a/release/datafiles/preview_grease_pencil.blend and 
b/release/datafiles/preview_grease_pencil.blend differ
diff --git a/source/blender/editors/render/render_preview.c 
b/source/blender/editors/render/render_preview.c
index 4a30012b4a9..a10f8342b57 100644
--- a/source/blender/editors/render/render_preview.c
+++ b/source/blender/editors/render/render_preview.c
@@ -1252,11 +1252,23 @@ void ED_preview_shader_job(const bContext *C, void 
*owner, ID *id, ID *parent, M
        sp->parent = parent;
        sp->slot = slot;
        sp->bmain = CTX_data_main(C);
+       Material *ma = NULL;
 
        /* hardcoded preview .blend for Eevee + Cycles, this should be solved
         * once with custom preview .blend path for external engines */
        if ((method != PR_NODE_RENDER) && id_type != ID_TE) {
-               sp->pr_main = G_pr_main_cycles;
+               /* grease pencil use its own preview file */
+               if (GS(id->name) == ID_MA) {
+                       ma = (Material *)id;
+               }
+
+               if ((ma == NULL) || (ma->gp_style == NULL)) {
+                       sp->pr_main = G_pr_main_cycles;
+               }
+               else {
+                       sp->pr_main = G_pr_main_grease_pencil;
+               }
+
        }
        else {
                sp->pr_main = G_pr_main;

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