Workbench: Fix missing Clipping state when usint Alt+B clipping

Also make the code a bit more clear.

3 files changed, 18 insertions, 20 deletions

diff --git a/source/blender/draw/engines/workbench/workbench_deferred.c b/source/blender/draw/engines/workbench/workbench_deferred.c
index e5872dbac50..da5ab0c3122 100644
--- a/source/blender/draw/engines/workbench/workbench_deferred.c
+++ b/source/blender/draw/engines/workbench/workbench_deferred.c
@@ -567,16 +567,15 @@ void workbench_deferred_engine_init(WORKBENCH_Data *vedata)
   /* Prepass */
   {
     DRWShadingGroup *grp;
-    const bool do_cull = CULL_BACKFACE_ENABLED(wpd);
+    DRWState clip_state = WORLD_CLIPPING_ENABLED(wpd) ? DRW_STATE_CLIP_PLANES : 0;
+    DRWState cull_state = CULL_BACKFACE_ENABLED(wpd) ? DRW_STATE_CULL_BACK : 0;
+    DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL;
 
-    int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL;
-    psl->prepass_pass = DRW_pass_create("Prepass",
-                                        (do_cull) ? state | DRW_STATE_CULL_BACK : state);
-    psl->prepass_hair_pass = DRW_pass_create("Prepass", state);
+    psl->prepass_pass = DRW_pass_create("Prepass", state | cull_state | clip_state);
+    psl->prepass_hair_pass = DRW_pass_create("Prepass", state | clip_state);
 
-    psl->ghost_prepass_pass = DRW_pass_create("Prepass Ghost",
-                                              (do_cull) ? state | DRW_STATE_CULL_BACK : state);
-    psl->ghost_prepass_hair_pass = DRW_pass_create("Prepass Ghost", state);
+    psl->ghost_prepass_pass = DRW_pass_create("Prepass Ghost", state | cull_state | clip_state);
+    psl->ghost_prepass_hair_pass = DRW_pass_create("Prepass Ghost", state | clip_state);
 
     psl->ghost_resolve_pass = DRW_pass_create("Resolve Ghost Depth",
                                               DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_ALWAYS);
@@ -807,18 +806,19 @@ void workbench_deferred_cache_init(WORKBENCH_Data *vedata)
    * this in a clean way.
    */
   if (OIT_ENABLED(wpd)) {
-    const bool do_cull = CULL_BACKFACE_ENABLED(wpd);
-    const int cull_state = (do_cull) ? DRW_STATE_CULL_BACK : 0;
+    DRWState clip_state = WORLD_CLIPPING_ENABLED(wpd) ? DRW_STATE_CLIP_PLANES : 0;
+    DRWState cull_state = CULL_BACKFACE_ENABLED(wpd) ? DRW_STATE_CULL_BACK : 0;
     /* Transparency Accum */
     {
       /* Same as forward but here we use depth test to
        * not bleed through other solid objects. */
-      int state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_OIT | DRW_STATE_DEPTH_LESS | cull_state;
+      int state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS | DRW_STATE_BLEND_OIT | cull_state |
+                  clip_state;
       psl->transparent_accum_pass = DRW_pass_create("Transparent Accum", state);
     }
     /* Depth */
     {
-      int state = DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | cull_state;
+      int state = DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | cull_state | clip_state;
       psl->object_outline_pass = DRW_pass_create("Transparent Depth", state);
     }
     /* OIT Composite */
diff --git a/source/blender/draw/engines/workbench/workbench_forward.c b/source/blender/draw/engines/workbench/workbench_forward.c
index 80b274e9b76..87f3b28c665 100644
--- a/source/blender/draw/engines/workbench/workbench_forward.c
+++ b/source/blender/draw/engines/workbench/workbench_forward.c
@@ -387,17 +387,19 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata)
                                 });
 
   workbench_volume_cache_init(vedata);
-  const bool do_cull = CULL_BACKFACE_ENABLED(wpd);
-  const int cull_state = (do_cull) ? DRW_STATE_CULL_BACK : 0;
+
+  DRWState clip_state = WORLD_CLIPPING_ENABLED(wpd) ? DRW_STATE_CLIP_PLANES : 0;
+  DRWState cull_state = CULL_BACKFACE_ENABLED(wpd) ? DRW_STATE_CULL_BACK : 0;
 
   /* Transparency Accum */
   {
-    int state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_OIT | cull_state;
+    int state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_OIT | cull_state | clip_state;
     psl->transparent_accum_pass = DRW_pass_create("Transparent Accum", state);
   }
   /* Depth */
   {
-    int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | cull_state;
+    int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | cull_state |
+                clip_state;
     psl->object_outline_pass = DRW_pass_create("Object Outline Pass", state);
   }
   /* Composite */
diff --git a/source/blender/draw/engines/workbench/workbench_materials.c b/source/blender/draw/engines/workbench/workbench_materials.c
index 45d49448490..37e2945a701 100644
--- a/source/blender/draw/engines/workbench/workbench_materials.c
+++ b/source/blender/draw/engines/workbench/workbench_materials.c
@@ -331,10 +331,6 @@ void workbench_material_shgroup_uniform(WORKBENCH_PrivateData *wpd,
   if (use_highlight) {
     DRW_shgroup_uniform_float(grp, "materialRoughness", &material->roughness, 1);
   }
-
-  if (WORLD_CLIPPING_ENABLED(wpd)) {
-    DRW_shgroup_state_enable(grp, DRW_STATE_CLIP_PLANES);
-  }
 }
 
 void workbench_material_copy(WORKBENCH_MaterialData *dest_material,