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@ -57,6 +57,8 @@ static const uint16_t SINEXP_BITDEPTH = 10; |
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static const uint16_t SINEXP_TABLESIZE = 1<<SINEXP_BITDEPTH; |
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static const uint16_t SINEXP_TABLESIZE = 1<<SINEXP_BITDEPTH; |
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static uint16_t sinExpTable[SINEXP_TABLESIZE]; |
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static uint16_t sinExpTable[SINEXP_TABLESIZE]; |
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const uint16_t ENV_MAX = 1<<ENV_BITDEPTH; |
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static inline uint16_t sinLog(uint16_t phi) { |
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static inline uint16_t sinLog(uint16_t phi) { |
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const uint16_t SINLOG_TABLEFILTER = SINLOG_TABLESIZE-1; |
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const uint16_t SINLOG_TABLEFILTER = SINLOG_TABLESIZE-1; |
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const uint16_t index = (phi & SINLOG_TABLEFILTER); |
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const uint16_t index = (phi & SINLOG_TABLEFILTER); |
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@ -200,183 +202,105 @@ void EngineMkI::compute_fb(int32_t *output, int32_t phase0, int32_t freq, |
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fb_buf[1] = y; |
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fb_buf[1] = y; |
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} |
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} |
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/*
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// exclusively used for ALGO 6 with feedback
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void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, |
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void EngineMkI::compute_fb2(int32_t *output, FmOpParams *parms, int32_t gain01, int32_t gain02, int32_t *fb_buf, int fb_shift) { |
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int32_t *fb_buf, int feedback_shift) { |
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int32_t dgain[2]; |
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const uint16_t ENV_MAX = 1<<ENV_BITDEPTH; |
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int32_t gain[2]; |
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const uint16_t kLevelThresh = ENV_MAX-100; // really ???? uhuhuh
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int32_t phase[2]; |
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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 (int op = 0; op < 6; op++) { |
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int 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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int inbus = (flags >> 4) & 3; |
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int 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 == 0 ? (ENV_MAX-1) : param.gain_out; |
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int32_t gain2 = ENV_MAX-(param.level_in >> (28-ENV_BITDEPTH)); |
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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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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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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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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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*/ |
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const FmAlgorithm EngineMkI::algo2[32] = { |
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{ { 0xc1, 0x11, 0x11, 0x14, 0x01, 0x14 } }, // 1
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{ { 0x01, 0x11, 0x11, 0x14, 0xc1, 0x14 } }, // 2
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{ { 0xc1, 0x11, 0x14, 0x01, 0x11, 0x14 } }, // 3
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{ { 0xc4, 0x00, 0x00, 0x01, 0x11, 0x14 } }, // 4 ** EXCEPTION VIA CODE
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{ { 0xc1, 0x14, 0x01, 0x14, 0x01, 0x14 } }, // 5
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{ { 0xc4, 0x00, 0x01, 0x14, 0x01, 0x14 } }, // 6 ** EXCEPTION VIA CODE
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{ { 0xc1, 0x11, 0x05, 0x14, 0x01, 0x14 } }, // 7
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{ { 0x01, 0x11, 0xc5, 0x14, 0x01, 0x14 } }, // 8
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{ { 0x01, 0x11, 0x05, 0x14, 0xc1, 0x14 } }, // 9
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{ { 0x01, 0x05, 0x14, 0xc1, 0x11, 0x14 } }, // 10
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{ { 0xc1, 0x05, 0x14, 0x01, 0x11, 0x14 } }, // 11
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{ { 0x01, 0x05, 0x05, 0x14, 0xc1, 0x14 } }, // 12
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{ { 0xc1, 0x05, 0x05, 0x14, 0x01, 0x14 } }, // 13
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{ { 0xc1, 0x05, 0x11, 0x14, 0x01, 0x14 } }, // 14
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{ { 0x01, 0x05, 0x11, 0x14, 0xc1, 0x14 } }, // 15
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{ { 0xc1, 0x11, 0x02, 0x25, 0x05, 0x14 } }, // 16
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{ { 0x01, 0x11, 0x02, 0x25, 0xc5, 0x14 } }, // 17
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{ { 0x01, 0x11, 0x11, 0xc5, 0x05, 0x14 } }, // 18
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{ { 0xc1, 0x14, 0x14, 0x01, 0x11, 0x14 } }, // 19
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{ { 0x01, 0x05, 0x14, 0xc1, 0x14, 0x14 } }, // 20
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{ { 0x01, 0x14, 0x14, 0xc1, 0x14, 0x14 } }, // 21
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{ { 0xc1, 0x14, 0x14, 0x14, 0x01, 0x14 } }, // 22
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{ { 0xc1, 0x14, 0x14, 0x01, 0x14, 0x04 } }, // 23
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{ { 0xc1, 0x14, 0x14, 0x14, 0x04, 0x04 } }, // 24
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{ { 0xc1, 0x14, 0x14, 0x04, 0x04, 0x04 } }, // 25
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{ { 0xc1, 0x05, 0x14, 0x01, 0x14, 0x04 } }, // 26
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{ { 0x01, 0x05, 0x14, 0xc1, 0x14, 0x04 } }, // 27
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{ { 0x04, 0xc1, 0x11, 0x14, 0x01, 0x14 } }, // 28
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{ { 0xc1, 0x14, 0x01, 0x14, 0x04, 0x04 } }, // 29
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{ { 0x04, 0xc1, 0x11, 0x14, 0x04, 0x04 } }, // 30
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{ { 0xc1, 0x14, 0x04, 0x04, 0x04, 0x04 } }, // 31
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{ { 0xc4, 0x04, 0x04, 0x04, 0x04, 0x04 } }, // 32
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}; |
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// exclusively used for ALGO 4 with feedback
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void EngineMkI::compute_fb3(int32_t *output, FmOpParams *parms, int32_t gain01, int32_t gain02, int32_t *fb_buf, int fb_shift) { |
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int32_t dgain[3]; |
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int32_t gain[3]; |
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int32_t phase[3]; |
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int32_t y0 = fb_buf[0]; |
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int32_t y0 = fb_buf[0]; |
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int32_t y = fb_buf[1]; |
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int32_t y = fb_buf[1]; |
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phase[0] = parms[0].phase; |
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phase[0] = parms[0].phase; |
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phase[1] = parms[1].phase; |
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phase[1] = parms[1].phase; |
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phase[2] = parms[2].phase; |
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parms[1].gain_out = (ENV_MAX-(parms[1].level_in >> (28-ENV_BITDEPTH))); |
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gain[0] = gain01; |
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gain[0] = gain01; |
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gain[1] = parms[1].gain_out; |
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gain[1] = parms[1].gain_out == 0 ? (ENV_MAX-1) : parms[1].gain_out; |
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gain[2] = parms[2].gain_out; |
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dgain[0] = (gain02 - gain01 + (N >> 1)) >> LG_N; |
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dgain[0] = (gain02 - gain01 + (N >> 1)) >> LG_N; |
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dgain[1] = (parms[1].gain_out - (parms[1].gain_out == 0 ? (ENV_MAX-1) : parms[1].gain_out)); |
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parms[1].gain_out = Exp2::lookup(parms[1].level_in - (14 * (1 << 24))); |
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dgain[1] = (parms[1].gain_out - gain[1] + (N >> 1)) >> LG_N; |
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parms[2].gain_out = Exp2::lookup(parms[2].level_in - (14 * (1 << 24))); |
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dgain[2] = (parms[1].gain_out - gain[2] + (N >> 1)) >> LG_N; |
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for (int i = 0; i < N; i++) { |
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for (int i = 0; i < N; i++) { |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); |
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// op 0
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// op 0
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gain[0] += dgain[0]; |
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gain[0] += dgain[0]; |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); // tsk tsk tsk: this needs some tuning
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y0 = y; |
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y0 = y; |
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y = Sin::lookup(phase[0] + scaled_fb); |
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y = mkiSin(phase[0]+scaled_fb, gain[0]); |
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y = ((int64_t)y * (int64_t)gain[0]) >> 24; |
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phase[0] += parms[0].freq; |
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phase[0] += parms[0].freq; |
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// op 1
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// op 1
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gain[1] += dgain[1]; |
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gain[1] += dgain[1]; |
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y = Sin::lookup(phase[1] + y); |
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y = mkiSin(phase[1]+y, gain[1]); |
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y = ((int64_t)y * (int64_t)gain[1]) >> 24; |
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phase[1] += parms[1].freq; |
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phase[1] += parms[1].freq; |
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// op 2
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gain[2] += dgain[2]; |
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y = Sin::lookup(phase[2] + y); |
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y = ((int64_t)y * (int64_t)gain[2]) >> 24; |
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output[i] = y; |
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output[i] = y; |
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phase[2] += parms[2].freq; |
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} |
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} |
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fb_buf[0] = y0; |
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fb_buf[0] = y0; |
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fb_buf[1] = y; |
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fb_buf[1] = y; |
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} |
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} |
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// exclusively used for ALGO 6 with feedback
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// exclusively used for ALGO 4 with feedback
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void EngineMkI::compute_fb2(int32_t *output, FmOpParams *parms, int32_t gain01, int32_t gain02, int32_t *fb_buf, int fb_shift) { |
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void EngineMkI::compute_fb3(int32_t *output, FmOpParams *parms, int32_t gain01, int32_t gain02, int32_t *fb_buf, int fb_shift) { |
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int32_t dgain[2]; |
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int32_t dgain[3]; |
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int32_t gain[2]; |
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int32_t gain[3]; |
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int32_t phase[2]; |
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int32_t phase[3]; |
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int32_t y0 = fb_buf[0]; |
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int32_t y0 = fb_buf[0]; |
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int32_t y = fb_buf[1]; |
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int32_t y = fb_buf[1]; |
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phase[0] = parms[0].phase; |
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phase[0] = parms[0].phase; |
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phase[1] = parms[1].phase; |
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phase[1] = parms[1].phase; |
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phase[2] = parms[2].phase; |
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parms[1].gain_out = (ENV_MAX-(parms[1].level_in >> (28-ENV_BITDEPTH))); |
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parms[2].gain_out = (ENV_MAX-(parms[2].level_in >> (28-ENV_BITDEPTH))); |
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gain[0] = gain01; |
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gain[0] = gain01; |
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gain[1] = parms[1].gain_out; |
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gain[1] = parms[1].gain_out == 0 ? (ENV_MAX-1) : parms[1].gain_out; |
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gain[2] = parms[2].gain_out == 0 ? (ENV_MAX-1) : parms[2].gain_out; |
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dgain[0] = (gain02 - gain01 + (N >> 1)) >> LG_N; |
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dgain[0] = (gain02 - gain01 + (N >> 1)) >> LG_N; |
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dgain[1] = (parms[1].gain_out - (parms[1].gain_out == 0 ? (ENV_MAX-1) : parms[1].gain_out)); |
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dgain[2] = (parms[2].gain_out - (parms[2].gain_out == 0 ? (ENV_MAX-1) : parms[2].gain_out)); |
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parms[1].gain_out = Exp2::lookup(parms[1].level_in - (14 * (1 << 24))); |
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dgain[1] = (parms[1].gain_out - gain[1] + (N >> 1)) >> LG_N; |
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for (int i = 0; i < N; i++) { |
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for (int i = 0; i < N; i++) { |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); |
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// op 0
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// op 0
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gain[0] += dgain[0]; |
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gain[0] += dgain[0]; |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1);
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y0 = y; |
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y0 = y; |
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y = Sin::lookup(phase[0] + scaled_fb); |
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y = mkiSin(phase[0]+scaled_fb, gain[0]); |
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y = ((int64_t)y * (int64_t)gain[0]) >> 24; |
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phase[0] += parms[0].freq; |
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phase[0] += parms[0].freq; |
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// op 1
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// op 1
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gain[1] += dgain[1]; |
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gain[1] += dgain[1]; |
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y = Sin::lookup(phase[1] + y); |
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y = mkiSin(phase[1]+y, gain[1]); |
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y = ((int64_t)y * (int64_t)gain[1]) >> 24; |
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output[i] = y; |
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phase[1] += parms[1].freq; |
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phase[1] += parms[1].freq; |
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// op 2
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gain[2] += dgain[2]; |
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y = mkiSin(phase[2]+y, gain[2]); |
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phase[2] += parms[2].freq; |
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output[i] = y; |
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} |
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} |
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fb_buf[0] = y0; |
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fb_buf[0] = y0; |
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fb_buf[1] = y; |
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fb_buf[1] = y; |
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} |
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} |
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void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, int32_t *fb_buf, int feedback_shift) { |
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void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, int32_t *fb_buf, int feedback_shift) { |
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const uint16_t ENV_MAX = 1<<ENV_BITDEPTH; |
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const int kLevelThresh = ENV_MAX-100; |
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const int kLevelThresh = ENV_MAX-100; |
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const FmAlgorithm alg = algo2[algorithm]; |
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FmAlgorithm alg = algorithms[algorithm]; |
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bool has_contents[3] = { true, false, false }; |
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bool has_contents[3] = { true, false, false }; |
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bool fb_on = feedback_shift < 16; |
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switch(algorithm) { |
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case 3 : case 5 : |
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if ( fb_on ) |
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alg.ops[0] = 0xc4; |
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} |
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for (int op = 0; op < 6; op++) { |
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for (int op = 0; op < 6; op++) { |
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int flags = alg.ops[op]; |
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int flags = alg.ops[op]; |
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@ -397,15 +321,8 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, int32 |
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if (inbus == 0 || !has_contents[inbus]) { |
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if (inbus == 0 || !has_contents[inbus]) { |
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// PG: this is my 'dirty' implementation of FB for 2 and 3 operators...
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// PG: this is my 'dirty' implementation of FB for 2 and 3 operators...
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// still needs some tuning...
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if ((flags & 0xc0) == 0xc0 && fb_on) { |
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if ((flags & 0xc0) == 0xc0 && feedback_shift < 16) { |
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switch ( algorithm ) { |
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switch ( algorithm ) { |
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// two operator feedback, process exception for ALGO 6
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case 5 : |
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compute_fb2(outptr, params, gain1, gain2, fb_buf, feedback_shift); |
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params[1].phase += params[1].freq << LG_N; // yuk, hack, we already processed op-5
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op++; // ignore next operator;
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break; |
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// three operator feedback, process exception for ALGO 4
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// three operator feedback, process exception for ALGO 4
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case 3 : |
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case 3 : |
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compute_fb3(outptr, params, gain1, gain2, fb_buf, feedback_shift); |
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compute_fb3(outptr, params, gain1, gain2, fb_buf, feedback_shift); |
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@ -413,24 +330,25 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, int32 |
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params[2].phase += params[2].freq << LG_N; // yuk yuk
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params[2].phase += params[2].freq << LG_N; // yuk yuk
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op += 2; // ignore the 2 other operators
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|
op += 2; // ignore the 2 other operators
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|
break; |
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|
break; |
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|
// two operator feedback, process exception for ALGO 6
|
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case 5 : |
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compute_fb2(outptr, params, gain1, gain2, fb_buf, feedback_shift); |
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|
params[1].phase += params[1].freq << LG_N; // yuk, hack, we already processed op-5
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|
op++; // ignore next operator;
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|
|
break; |
|
|
|
default: |
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|
default: |
|
|
|
// one operator feedback, normal proces
|
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|
|
// one operator feedback, normal proces
|
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|
|
//cout << "\t" << op << " fb " << inbus << outbus << add << endl;
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|
|
compute_fb(outptr, param.phase, param.freq, gain1, gain2, fb_buf, feedback_shift, add); |
|
|
|
compute_fb(outptr, param.phase, param.freq, gain1, gain2, fb_buf, feedback_shift, add); |
|
|
|
break; |
|
|
|
break; |
|
|
|
} |
|
|
|
} |
|
|
|
} else { |
|
|
|
} else { |
|
|
|
// cout << op << " pure " << inbus << outbus << add << endl;
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|
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|
|
|
compute_pure(outptr, param.phase, param.freq, gain1, gain2, add); |
|
|
|
compute_pure(outptr, param.phase, param.freq, gain1, gain2, add); |
|
|
|
} |
|
|
|
} |
|
|
|
} else { |
|
|
|
} else { |
|
|
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|
|
|
|
|
|
|
|
// cout << op << " normal " << inbus << outbus << " " << param.freq << add << endl;
|
|
|
|
|
|
|
|
compute(outptr, buf_[inbus - 1].get(), param.phase, param.freq, gain1, gain2, add); |
|
|
|
compute(outptr, buf_[inbus - 1].get(), param.phase, param.freq, gain1, gain2, add); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
has_contents[outbus] = true; |
|
|
|
has_contents[outbus] = true; |
|
|
|
|
|
|
|
|
|
|
|
} else if (!add) { |
|
|
|
} else if (!add) { |
|
|
|
has_contents[outbus] = false; |
|
|
|
has_contents[outbus] = false; |
|
|
|
} |
|
|
|
} |
|
|
|