Fix T76970: Unneccessary update calls viewport

Due to recent changes clicks in the node editor would trigger a
depsgraph update resulting in too many redraws. This patch limits
the updates to when workbench shown in texture mode in any visible
screen.

There are still cases where too many updates are created. For example when
there are a Cycles render viewport and a Workbench texture viewport on the
same screen.

This fix is meant as a workaround. The actual fix should add a mechanism
to the depsgraph and the viewports should check if they need to be redrawn.

Reviewed By: Brecht van Lommel

Differential Revision: https://developer.blender.org/D7830

1 files changed, 20 insertions, 0 deletions

diff --git a/source/blender/editors/space_view3d/view3d_utils.c b/source/blender/editors/space_view3d/view3d_utils.c
index 09e1dca3152..377e8c58ba3 100644
--- a/source/blender/editors/space_view3d/view3d_utils.c
+++ b/source/blender/editors/space_view3d/view3d_utils.c
@@ -86,6 +86,26 @@ void ED_view3d_background_color_get(const Scene *scene, const View3D *v3d, float
   UI_GetThemeColor3fv(TH_BACK, r_color);
 }
 
+bool ED_view3d_has_workbench_in_texture_color(const Scene *scene,
+                                              const Object *ob,
+                                              const View3D *v3d)
+{
+  if (v3d->shading.type == OB_SOLID) {
+    if (v3d->shading.color_type == V3D_SHADING_TEXTURE_COLOR) {
+      return true;
+    }
+    if (ob->mode == OB_MODE_TEXTURE_PAINT) {
+      return true;
+    }
+  }
+  else if (v3d->shading.type == OB_RENDER) {
+    if (STREQ(scene->r.engine, RE_engine_id_BLENDER_WORKBENCH)) {
+      return scene->display.shading.color_type == V3D_SHADING_TEXTURE_COLOR;
+    }
+  }
+  return false;
+}
+
 Camera *ED_view3d_camera_data_get(View3D *v3d, RegionView3D *rv3d)
 {
   /* establish the camera object,