Add SelectInput node

source/include/signalflow/node/operators/select-input.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "signalflow/core/constants.h"
+#include "signalflow/node/node.h"
+
+#include <list>
+
+namespace signalflow
+{
+
+/**--------------------------------------------------------------------------------*
+ * Generates the
+ *---------------------------------------------------------------------------------*/
+class SelectInput : public VariableInputNode
+{
+
+public:
+    SelectInput(NodeRef index = 0);
+    SelectInput(std::initializer_list<NodeRef> inputs, NodeRef index = 0);
+    SelectInput(std::vector<NodeRef> inputs, NodeRef index = 0);
+    SelectInput(std::vector<int> inputs, NodeRef index = 0);
+    SelectInput(std::vector<float> inputs, NodeRef index = 0);
+
+    virtual void process(Buffer &out, int num_frames);
+
+protected:
+    void init(NodeRef index);
+    NodeRef index;
+};
+
+REGISTER(SelectInput, "select-input")
+
+}

source/src/node/operators/select-input.cpp

@@ -0,0 +1,69 @@
+#include "signalflow/core/core.h"
+#include "signalflow/node/operators/select-input.h"
+
+namespace signalflow
+{
+void SelectInput::init(NodeRef index)
+{
+    this->name = "select-input";
+
+    this->index = index;
+    this->create_input("index", this->index);
+}
+
+SelectInput::SelectInput(NodeRef index)
+    : VariableInputNode()
+{
+    this->init(index);
+}
+
+SelectInput::SelectInput(std::initializer_list<NodeRef> inputs, NodeRef index)
+    : VariableInputNode(inputs)
+{
+    this->init(index);
+}
+
+SelectInput::SelectInput(std::vector<NodeRef> inputs, NodeRef index)
+    : VariableInputNode(inputs)
+{
+    this->init(index);
+}
+
+SelectInput::SelectInput(std::vector<float> inputs, NodeRef index)
+    : VariableInputNode(inputs)
+{
+    this->init(index);
+}
+
+SelectInput::SelectInput(std::vector<int> inputs, NodeRef index)
+    : VariableInputNode(inputs)
+{
+    this->init(index);
+}
+
+void SelectInput::process(Buffer &out, int num_frames)
+{
+    if (this->input_list.size() == 0)
+    {
+        signalflow_audio_thread_error("SelectInput: No inputs were passed to select from");
+    }
+
+    int index = 0;
+    int last_index = -1;
+    NodeRef selected_node = nullptr;
+    for (int frame = 0; frame < num_frames; frame++)
+    {
+        index = ((int) this->index->out[0][frame]) % this->input_list.size();
+        if (index != last_index)
+        {
+            selected_node = *std::next(this->input_list.begin(), index);
+            last_index = index;
+        }
+        for (int channel = 0; channel < this->get_num_output_channels(); channel++)
+        {
+            out[channel][frame] = selected_node->out[channel][frame];
+        }
+    }
+}
+
+}