From 0639ba8ea58bc775bfa3436e1ba9831ece78404d Mon Sep 17 00:00:00 2001
From: Thomas Dinges <blender@dingto.org>
Date: Wed, 18 Nov 2015 18:47:56 +0100
Subject: Cycles / Shader graph: Fallback to Sharp closures for very small
 roughness.

We fallback to Sharp closures for Glossy, Glass and Refraction nodes now, in case the Roughness input is disconnected and 0 (< 1e-4f to be exact).
This way we gain a few percentages of performance, in case the user did not manually set the closure type to "Sharp" in the UI.

Sharp will probably be removed from the UI as a followup, not needed anymore with this internal optimization.

Original idea by Lukas Stockner(Differential Revision: https://developer.blender.org/D1439), code implementation by myself.
---
 intern/cycles/render/graph.cpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'intern/cycles/render/graph.cpp')

diff --git a/intern/cycles/render/graph.cpp b/intern/cycles/render/graph.cpp
index a342eaed373..6a9b7244ced 100644
--- a/intern/cycles/render/graph.cpp
+++ b/intern/cycles/render/graph.cpp
@@ -354,7 +354,13 @@ void ShaderGraph::copy_nodes(set<ShaderNode*>& nodes, map<ShaderNode*, ShaderNod
 		}
 	}
 }
+/* Graph simplification */
+/* ******************** */
 
+/* Step 1: Remove unused nodes.
+ * Remove nodes which are not needed in the graph, such as proxies,
+ * mix nodes with a factor of 0 or 1, emission shaders without contribution...
+ */
 void ShaderGraph::remove_unneeded_nodes()
 {
 	vector<bool> removed(num_node_ids, false);
@@ -550,6 +556,14 @@ void ShaderGraph::remove_unneeded_nodes()
 	}
 }
 
+/* Step 3: Simplification.*/
+void ShaderGraph::simplify_nodes()
+{
+	foreach(ShaderNode *node, nodes) {
+		node->optimize();
+	}
+}
+
 void ShaderGraph::break_cycles(ShaderNode *node, vector<bool>& visited, vector<bool>& on_stack)
 {
 	visited[node->id] = true;
@@ -590,7 +604,7 @@ void ShaderGraph::clean()
 	/* TODO(dingto): Implement */
 
 	/* 3: Simplification. */
-	/* TODO(dingto): Implement */
+	simplify_nodes();
 
 	/* 4: De-duplication. */
 	/* TODO(dingto): Implement */
-- 
cgit v1.2.3