MicroDexed is a compatible 6-operator-FM-synth based on the Teensy(-3.6/-4.x) Microcontroller. https://www.parasitstudio.de
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/*
Copyright 2012 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#ifndef __FM_OP_KERNEL_H
#define __FM_OP_KERNEL_H
struct FmOpParams {
int32_t level_in; // value to be computed (from level to gain[0])
int32_t gain_out; // computed value (gain[1] to gain[0])
int32_t freq;
int32_t phase;
};
class FmOpKernel {
public:
// gain1 and gain2 represent linear step: gain for sample i is
// gain1 + (1 + i) / 64 * (gain2 - gain1)
// This is the basic FM operator. No feedback.
static void compute(int32_t *output, const int32_t *input,
int32_t phase0, int32_t freq,
int32_t gain1, int32_t gain2, bool add);
// This is a sine generator, no feedback.
static void compute_pure(int32_t *output, int32_t phase0, int32_t freq,
int32_t gain1, int32_t gain2, bool add);
// One op with feedback, no add.
static void compute_fb(int32_t *output, int32_t phase0, int32_t freq,
int32_t gain1, int32_t gain2,
int32_t *fb_buf, int fb_gain, bool add);
};
#endif