From 836c69c92fb5992eb83c4311a98f5ffad4a172f5 Mon Sep 17 00:00:00 2001
From: Thomas Dinges <blender@dingto.org>
Date: Wed, 18 Nov 2015 17:20:39 +0100
Subject: Cleanup: Add some notes in code for upcoming graph simplification
 process.

---
 intern/cycles/render/graph.cpp | 18 +++++++++++++++++-
 1 file changed, 17 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 16e1ef7a493..a342eaed373 100644
--- a/intern/cycles/render/graph.cpp
+++ b/intern/cycles/render/graph.cpp
@@ -576,9 +576,25 @@ void ShaderGraph::break_cycles(ShaderNode *node, vector<bool>& visited, vector<b
 
 void ShaderGraph::clean()
 {
-	/* remove proxy and unnecessary nodes */
+	/* Graph simplification:
+	 *  1: Remove unnecesarry nodes
+	 *  2: Constant folding
+	 *  3: Simplification
+	 *  4: De-duplication
+	 */
+
+	/* 1: Remove proxy and unnecessary nodes. */
 	remove_unneeded_nodes();
 
+	/* 2: Constant folding. */
+	/* TODO(dingto): Implement */
+
+	/* 3: Simplification. */
+	/* TODO(dingto): Implement */
+
+	/* 4: De-duplication. */
+	/* TODO(dingto): Implement */
+
 	/* we do two things here: find cycles and break them, and remove unused
 	 * nodes that don't feed into the output. how cycles are broken is
 	 * undefined, they are invalid input, the important thing is to not crash */
-- 
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