Cycles: Fix filter glossy being broken after recent changes

Basically we can not use sharp closure as a substitude when filter glossy is
used. This is because we can not blur sharp reflection/refraction.

This is quite quick and not really clean implementation. Not really happy
with manual handling of original settings, but this is as good as we can do
in the quick patch. It's a good acknowledgment and we now can re-consider
some aspects of graph simplification to make such cases more natively
supported.

P.S. This failure would have been shown by our regression tests, so please,
bother a bit to run Cycles's test sweep before doing such optimizations.

1 files changed, 12 insertions, 6 deletions

diff --git a/intern/cycles/render/graph.cpp b/intern/cycles/render/graph.cpp
index 749640040f5..7e6e960d585 100644
--- a/intern/cycles/render/graph.cpp
+++ b/intern/cycles/render/graph.cpp
@@ -266,7 +266,10 @@ void ShaderGraph::relink(vector<ShaderInput*> inputs, vector<ShaderInput*> outpu
 	}
 }
 
-void ShaderGraph::finalize(bool do_bump, bool do_osl)
+void ShaderGraph::finalize(Scene *scene,
+                           bool do_bump,
+                           bool do_osl,
+                           bool do_simplify)
 {
 	/* before compiling, the shader graph may undergo a number of modifications.
 	 * currently we set default geometry shader inputs, and create automatic bump
@@ -274,7 +277,7 @@ void ShaderGraph::finalize(bool do_bump, bool do_osl)
 	 * modified afterwards. */
 
 	if(!finalized) {
-		clean();
+		clean(scene);
 		default_inputs(do_osl);
 		refine_bump_nodes();
 
@@ -293,6 +296,9 @@ void ShaderGraph::finalize(bool do_bump, bool do_osl)
 
 		finalized = true;
 	}
+	else if(do_simplify) {
+		simplify_nodes(scene);
+	}
 }
 
 void ShaderGraph::find_dependencies(set<ShaderNode*>& dependencies, ShaderInput *input)
@@ -557,10 +563,10 @@ void ShaderGraph::remove_unneeded_nodes()
 }
 
 /* Step 3: Simplification.*/
-void ShaderGraph::simplify_nodes()
+void ShaderGraph::simplify_nodes(Scene *scene)
 {
 	foreach(ShaderNode *node, nodes) {
-		node->optimize();
+		node->optimize(scene);
 	}
 }
 
@@ -588,7 +594,7 @@ void ShaderGraph::break_cycles(ShaderNode *node, vector<bool>& visited, vector<b
 	on_stack[node->id] = false;
 }
 
-void ShaderGraph::clean()
+void ShaderGraph::clean(Scene *scene)
 {
 	/* Graph simplification:
 	 *  1: Remove unnecesarry nodes
@@ -604,7 +610,7 @@ void ShaderGraph::clean()
 	/* TODO(dingto): Implement */
 
 	/* 3: Simplification. */
-	simplify_nodes();
+	simplify_nodes(scene);
 
 	/* 4: De-duplication. */
 	/* TODO(dingto): Implement */