UI controls in emulator

synth_engine.h

@@ -17,6 +17,12 @@
  */
 class SynthEngine {
 public:
+    enum Waveform {
+        SAWTOOTH,
+        SQUARE,
+        SINE
+    };
+
     /**
      * @brief Constructs the synthesizer engine.
      * @param sampleRate The audio sample rate in Hz (e.g., 44100).
@@ -36,10 +42,24 @@ public:
      */
     void setFrequency(float freq);
 
+    /**
+     * @brief Sets the output volume.
+     * @param vol Volume from 0.0 (silent) to 1.0 (full).
+     */
+    void setVolume(float vol);
+
+    /**
+     * @brief Sets the oscillator's waveform.
+     * @param form The waveform to use.
+     */
+    void setWaveform(Waveform form);
+
 private:
     uint32_t _sampleRate;
     uint32_t _phase;      // Phase accumulator for the oscillator.
     uint32_t _increment;  // Phase increment per sample, determines frequency.
+    float _volume;
+    Waveform _waveform;
 };
 
 #endif // SYNTH_ENGINE_H