began support of timeline tracks/channels

app/node/blend/blend.cpp

@@ -0,0 +1,22 @@
+#include "blend.h"
+
+BlendNode::BlendNode()
+{
+  base_input_ = new NodeInput("base_in");
+  base_input_->add_data_input(NodeParam::kTexture);
+  AddParameter(base_input_);
+
+  blend_input_ = new NodeInput("blend_in");
+  blend_input_->add_data_input(NodeParam::kTexture);
+  AddParameter(blend_input_);
+}
+
+NodeInput *BlendNode::base_input()
+{
+  return base_input_;
+}
+
+NodeInput *BlendNode::blend_input()
+{
+  return blend_input_;
+}