Optimized: Fixed point calculations

synth_engine.h

@@ -32,6 +32,13 @@ template <typename Mutex>
 using SynthLockGuard = std::lock_guard<Mutex>;
 #endif
 
+// Fixed-point constants
+#define FP_SHIFT 15
+#define FP_ONE (1 << FP_SHIFT)
+#define FP_HALF (1 << (FP_SHIFT - 1))
+#define FP_MAX 32767
+#define FP_MIN -32768
+
 /**
  * @class SynthEngine
  * @brief A portable, platform-agnostic synthesizer engine.
@@ -102,11 +109,11 @@ public:
         enum Op { OP_ADD, OP_MUL, OP_SUB, OP_DIV, OP_MIN, OP_MAX };
         
         Type type = EMPTY;
-        float param = 0.5f; // 0.0 to 1.0
+        int32_t param = FP_HALF; // 0.0 to 1.0 -> 0 to 32768
         int rotation = 0;   // 0:N, 1:E, 2:S, 3:W (Output direction)
-        float value = 0.0f; // Current output sample
-        float next_value = 0.0f; // For double-buffering in processGridStep
-        float phase = 0.0f; // For Oscillator, Noise state
+        int32_t value = 0; // Current output sample (Q15)
+        int32_t next_value = 0; // For double-buffering
+        int32_t phase = 0; // For Oscillator, Noise state, Filter state
         uint32_t phase_accumulator = 0; // For Oscillators (Fixed point optimization)
     };
 
@@ -125,7 +132,7 @@ public:
     SynthMutex gridMutex;
 
     // Helper to process one sample step of the grid
-    float processGridStep();
+    int32_t processGridStep();
 
 private:
     uint32_t _sampleRate;
@@ -140,7 +147,7 @@ private:
     void rebuildProcessingOrder_locked();
 
     // Internal random number generator
-    float _random();
+    int32_t _random();
 };
 
 #endif // SYNTH_ENGINE_H