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67 lines
2.5 KiB
67 lines
2.5 KiB
5 months ago
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/*
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Copyright 2012 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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//using namespace std;
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#include "synth.h"
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#include "exp2.h"
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#include "fm_op_kernel.h"
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#include "EngineMsfa.h"
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void EngineMsfa::render(int32_t *output, FmOpParams *params, int32_t algorithm, int32_t *fb_buf, int32_t feedback_shift) {
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const int32_t kLevelThresh = 1120;
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const FmAlgorithm alg = algorithms[algorithm];
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bool has_contents[3] = { true, false, false };
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for (uint8_t op = 0; op < 6; op++) {
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int32_t flags = alg.ops[op];
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bool add = (flags & OUT_BUS_ADD) != 0;
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FmOpParams ¶m = params[op];
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int32_t inbus = (flags >> 4) & 3;
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int32_t outbus = flags & 3;
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int32_t *outptr = (outbus == 0) ? output : buf_[outbus - 1].get();
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int32_t gain1 = param.gain_out;
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int32_t gain2 = Exp2::lookup(param.level_in - (14 * (1 << 24)));
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param.gain_out = gain2;
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if (gain1 >= kLevelThresh || gain2 >= kLevelThresh) {
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if (!has_contents[outbus]) {
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add = false;
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}
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if (inbus == 0 || !has_contents[inbus]) {
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// todo: more than one op in a feedback loop
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if ((flags & 0xc0) == 0xc0 && feedback_shift < 16) {
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// cout << op << " fb " << inbus << outbus << add << endl;
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FmOpKernel::compute_fb(outptr, param.phase, param.freq,
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gain1, gain2,
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fb_buf, feedback_shift, add);
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} else {
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// cout << op << " pure " << inbus << outbus << add << endl;
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FmOpKernel::compute_pure(outptr, param.phase, param.freq,
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gain1, gain2, add);
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}
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} else {
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// cout << op << " normal " << inbus << outbus << " " << param.freq << add << endl;
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FmOpKernel::compute(outptr, buf_[inbus - 1].get(),
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param.phase, param.freq, gain1, gain2, add);
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}
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has_contents[outbus] = true;
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} else if (!add) {
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has_contents[outbus] = false;
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}
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param.phase += param.freq << LG_N;
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}
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}
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