*** empty log message ***

panda/src/cull/cullTraverser.cxx

@@ -20,6 +20,7 @@
 #include <nodeTransitionWrapper.h>
 #include <indent.h>
 #include <config_sgraphutil.h>  // for implicit_app_traversal
+#include <config_sgattrib.h>    // for support_decals
 #include <pStatTimer.h>
 
 TypeHandle CullTraverser::_type_handle;
@@ -392,9 +393,20 @@ forward_arc(NodeRelation *arc, NullTransitionWrapper &,
   bool is_geom = node->is_of_type(GeomNode::get_class_type());
   bool node_has_sub_render = node->has_sub_render();
   bool arc_has_sub_render = arc->has_sub_render_trans();
-  bool has_direct_render =
-    arc->has_transition(DirectRenderTransition::get_class_type()) ||
-    arc->has_transition(DecalTransition::get_class_type());
+  bool has_direct_render;
+
+#ifndef NDEBUG
+  if (support_decals != SD_on) {
+    has_direct_render =
+      arc->has_transition(DirectRenderTransition::get_class_type()) &&
+      !arc->has_transition(DecalTransition::get_class_type());
+  } else 
+#endif
+    {
+      has_direct_render =
+	arc->has_transition(DirectRenderTransition::get_class_type()) ||
+	arc->has_transition(DecalTransition::get_class_type());
+    }
 
   if (arc_has_sub_render) {
     level_state._now = UpdateSeq::fresh();
@@ -477,5 +489,13 @@ forward_arc(NodeRelation *arc, NullTransitionWrapper &,
     add_geom_node(DCAST(GeomNode, node), trans, level_state);
   }
 
+#ifndef NDEBUG
+  if (support_decals == SD_hide &&
+      arc->has_transition(DecalTransition::get_class_type())) {
+    mark_backward_arc(arc);
+    return false;
+  }
+#endif
+
   return true;
 }

panda/src/sgattrib/config_sgattrib.cxx

@@ -64,11 +64,53 @@ Configure(config_sgattrib);
 NotifyCategoryDef(sgattrib, "");
 
 
-// MPG - we want to ensure that texture transitions are applied before
-// texgen transitions, so the texture transition must be initialized
-// first.
+// For performance testing reasons, it may be useful to support decals
+// (specially rendered coplanar geometry) to varying
+// less-than-complete degrees.  Modify the variable support-decals to
+// change this.  The legal values are:
+//
+//   on - This is the default, and causes decals to be rendered
+//        properly (if supported by the gsg backend).  This could have
+//        performance implications in fill, transform, and
+//        state-sorting.  This is equivalent to #t.
+//
+//  off - Decals are rendered as if they were not decalled at all.
+//        The result will generally be horrible looking, with each
+//        decal Z-fighting with its base.  This is equivalent to #f.
+//
+// hide - Decals are not drawn at all.
+//
+// If compiled in NDEBUG mode, this variable is ignored and decals are
+// always on.
+//
+SupportDecals support_decals = SD_on;
+
+static SupportDecals
+parse_support_decals(const string &type) {
+  if (type == "on") {
+    return SD_on;
+  } else if (type == "off") {
+    return SD_off;
+  } else if (type == "hide") {
+    return SD_hide;
+  }
+  return SD_invalid;
+}
 
 ConfigureFn(config_sgattrib) {
+  string support_decals_str = config_sgattrib.GetString("support-decals", "");
+  if (!support_decals_str.empty()) {
+    support_decals = parse_support_decals(support_decals_str);
+    if (support_decals == SD_invalid) {
+      support_decals = 
+	config_sgattrib.GetBool("support-decals", true) ? SD_on : SD_off;
+    }
+  }
+
+  // MPG - we want to ensure that texture transitions are applied
+  // before texgen transitions, so the texture transition must be
+  // initialized first.
+
   RenderRelation::init_type();
   TextureTransition::init_type();
   TextureAttribute::init_type();
@@ -140,4 +182,3 @@ ConfigureFn(config_sgattrib) {
   ColorMatrixTransition::register_with_read_factory();
 }
 
-

panda/src/sgattrib/config_sgattrib.h

@@ -11,4 +11,14 @@
 
 NotifyCategoryDecl(sgattrib, EXPCL_PANDA, EXPTP_PANDA);
 
+// Configure variables for sgattrib package.
+enum SupportDecals {
+  SD_on,
+  SD_off,
+  SD_hide,
+  SD_invalid
+};
+
+extern EXPCL_PANDA SupportDecals support_decals;
+
 #endif

panda/src/sgraphutil/directRenderTraverser.cxx

@@ -24,6 +24,7 @@
 #include <decalTransition.h>
 #include <decalAttribute.h>
 #include <pStatTimer.h>
+#include <config_sgattrib.h>   // for support_decals
 
 TypeHandle DirectRenderTraverser::_type_handle;
 PStatCollector DirectRenderTraverser::_draw_pcollector =
@@ -70,12 +71,17 @@ traverse(Node *root,
 
   DirectRenderLevelState level_state;
 
-  DecalAttribute *decal_attrib;
-  if (get_attribute_into(decal_attrib, render_state,
-			 DecalTransition::get_class_type())) {
-    level_state._decal_mode = decal_attrib->is_on();
-  }
-
+#ifndef NDEBUG
+  if (support_decals != SD_off)
+#endif
+    {
+      DecalAttribute *decal_attrib;
+      if (get_attribute_into(decal_attrib, render_state,
+			     DecalTransition::get_class_type())) {
+	level_state._decal_mode = decal_attrib->is_on();
+      }
+    }
+    
   // Determine the relative transform matrix from the camera to our
   // starting node.  This is important for proper view-frustum
   // culling.
@@ -96,6 +102,11 @@ traverse(Node *root,
 
   if (level_state._decal_mode && 
       root->is_of_type(GeomNode::get_class_type())) {
+#ifndef NDEBUG
+    if (support_decals == SD_hide) {
+      return;
+    }
+#endif
     // Close the decal.
     _gsg->end_decal(DCAST(GeomNode, root));
   }
@@ -132,13 +143,25 @@ reached_node(Node *node, AllAttributesWrapper &render_state,
     GeomNode *geom = DCAST(GeomNode, node); 
 
     // We must make decals a special case, because they're so strange.
-    DecalAttribute *decal_attrib;
-    if (get_attribute_into(decal_attrib, render_state,
-			   DecalTransition::get_class_type())) {
-      level_state._decal_mode = decal_attrib->is_on();
-    }
+#ifndef NDEBUG
+    if (support_decals != SD_off)
+#endif
+      {
+	DecalAttribute *decal_attrib;
+	if (get_attribute_into(decal_attrib, render_state,
+			       DecalTransition::get_class_type())) {
+	  level_state._decal_mode = decal_attrib->is_on();
+	}
+      }
 
     if (level_state._decal_mode) {
+#ifndef NDEBUG
+      if (support_decals == SD_hide) {
+	level_state._decal_mode = false;
+	geom->draw(_gsg);
+	return false;
+      }
+#endif
       _gsg->begin_decal(geom);
 
     } else {