1 files changed, 28 insertions, 0 deletions
diff --git a/source/device_formula.cpp b/source/device_formula.cpp
new file mode 100644
index 0000000..5c1ca16
--- /dev/null
+++ b/source/device_formula.cpp
@@ -0,0 +1,28 @@
+#include "stmdsp.hpp"
+#include "exprtk.hpp"
+
+#include <algorithm>
+#include <string_view>
+#include <vector>
+
+std::vector<stmdsp::dacsample_t> deviceGenLoadFormulaEval(const std::string_view formulaString)
+{
+    double x = 0;
+
+    exprtk::symbol_table<double> symbol_table;
+    exprtk::expression<double> expression;
+    exprtk::parser<double> parser;
+
+    symbol_table.add_variable("x", x);
+    symbol_table.add_constants();
+    expression.register_symbol_table(symbol_table);
+    parser.compile(std::string(formulaString), expression);
+
+    std::vector<stmdsp::dacsample_t> samples (stmdsp::SAMPLES_MAX);
+
+    std::generate(samples.begin(), samples.end(),
+                  [&] { ++x; return static_cast<stmdsp::dacsample_t>(expression.value()); });
+
+    return samples;
+}
+