- initial import

git-svn-id: http://moon:8086/svn/software/trunk/projects/JaySynth@37 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-10-25 07:27:55 +00:00
commit 843c6e300c
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+// --------------------------------------------------------------
+// --------------------------------------------------------------
+#ifndef _LFO_H_
+#define	_LFO_H_
+
+#include "synth_defs.h"
+#include "noise.h"
+
+#define LFO_SH_ALPHA		0.002		// S&H smoothing
+#define LFO_KE			((synth_float_t)(1-exp(-1)))
+
+// --------------------------------------------------------------
+// Types
+// --------------------------------------------------------------
+enum
+{	
+	LFO_WAVEFORM_SINE,
+	LFO_WAVEFORM_COSINE,
+	LFO_WAVEFORM_SAW,
+	LFO_WAVEFORM_SQUARE,
+	LFO_WAVEFORM_TRIANGLE,
+	LFO_WAVEFORM_SH_UNI,
+	LFO_WAVEFORM_SH_GAUSS,
+	LFO_WAVEFORM_ONE_MINUS_SINE,
+	LFO_WAVEFORM_ONE_MINUS_COSINE,
+	LFO_WAVEFORM_ONE_MINUS_SAW,
+	LFO_WAVEFORM_ONE_MINUS_SQUARE,
+	LFO_WAVEFORM_ONE_MINUS_TRIANGLE,
+	LFO_NUM_WAVEFORMS
+};
+
+enum
+{
+	LFO_PARAM2_WAVEFORM,
+	LFO_PARAM2_FREQ,
+	LFO_PARAM2_SMOOTH,
+	LFO_PARAM2_DELAY,
+	LFO_PARAM2_ATTACK,
+	LFO_PARAM2_SYMMETRY,
+	LFO_NUM_PARAMS
+};
+
+typedef struct _slfo_t
+{
+	synth_float_t param[LFO_NUM_PARAMS];
+	synth_float_t fs;
+	synth_float_t a, b, y[2], x, dx, out, sh_sample, tri;
+	int freq_update_req, sqr;
+	synth_float_t *pOut;
+	UINT32 bufsize;
+	noise_gen_t noise;
+	synth_float_t smooth_a, smooth_b;
+	UINT32 smooth_is_negative;
+	synth_float_t delay_x, delay_dx, attack_y, attack_a;
+	synth_float_t gain, offset;
+
+} lfo_t;
+
+// --------------------------------------------------------------
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+// --------------------------------------------------------------
+// Exported functions
+// --------------------------------------------------------------
+void LFO_Init(lfo_t *pObj, synth_float_t fs);
+void LFO_Free(lfo_t *pObj);
+void LFO_SetFS(lfo_t *pObj, synth_float_t fs);
+void LFO_SetBufsize(lfo_t *pObj, UINT32 bufsize);
+void LFO_Reset(lfo_t *pObj, synth_float_t initial_phase);
+void LFO_Param2Set(lfo_t *pObj, UINT32 type, synth_float_t value);
+synth_float_t* LFO_ProcessDataV(lfo_t *pObj, UINT32 len);
+
+#if defined(__cplusplus)
+}
+
+#endif
+// --------------------------------------------------------------
+
+#endif // _LFO_H_