fix [#33501] Grease pencil in OpenGL render

With the view3d 'Render Only' option, grease pencil wouldn't draw, but for OpenGL render it did.

Since grease pencil can be very useful in opengl renders, enable grease pencil drawing with 'Render Only' option in the viewport,
and add a checkbox in the grease pencil header not to draw (unchecking each layer is annoying and applies to all spaces).

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/editors/gpencil/gpencil_buttons.c b/source/blender/editors/gpencil/gpencil_buttons.c
index 8a3c996a481..0aa109a0aef 100644
--- a/source/blender/editors/gpencil/gpencil_buttons.c
+++ b/source/blender/editors/gpencil/gpencil_buttons.c
@@ -312,6 +312,13 @@ static void draw_gpencil_panel(bContext *C, uiLayout *layout, bGPdata *gpd, Poin
 	}
 }
 
+void gpencil_panel_standard_header(const bContext *C, Panel *pa)
+{
+	PointerRNA ptr;
+	RNA_pointer_create((ID *)CTX_wm_screen(C), &RNA_Space, CTX_wm_space_data(C), &ptr);
+
+	uiItemR(pa->layout, &ptr, "show_grease_pencil", 0, "", ICON_NONE);
+}
 
 /* Standard panel to be included wherever Grease Pencil is used... */
 void gpencil_panel_standard(const bContext *C, Panel *pa)