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@ -23,127 +23,134 @@ |
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#include "msfa/sin.h" |
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#include "msfa/exp2.h" |
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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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static const uint16_t MKI_BITDEPTH = 8; |
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static const uint16_t MKI_TABLESIZE = 1<<MKI_BITDEPTH; |
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static const uint16_t MKI_TABLEFILTER = MKI_TABLESIZE-1; |
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static const uint16_t NEGATIVE_BIT = 0x8000; |
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#ifdef _WIN32 |
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__declspec(align(16)) int zeros[N] = {0}; |
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#else |
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const int32_t __attribute__ ((aligned(16))) zeros[N] = {0}; |
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#endif |
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static uint16_t sinLogTable[MKI_TABLESIZE]; |
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static uint16_t sinExpTable[MKI_TABLESIZE]; |
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EngineMkI::EngineMkI() { |
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float bitReso = MKI_TABLESIZE; |
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for(int i=0;i<MKI_TABLESIZE;i++) { |
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float x1 = sin(((0.5+i)/bitReso) * M_PI/2.0); |
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sinLogTable[i] = round(-bitReso * log2(x1)); |
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} |
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bitReso = MKI_TABLESIZE; |
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for(int i=0;i<MKI_TABLESIZE;i++) { |
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float x1 = (pow(2, float(i)/bitReso)-1)*1024; |
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sinExpTable[i] = round(x1); |
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} |
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} |
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static inline uint16_t sinLog(uint16_t phi) { |
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const uint16_t index = (phi & MKI_TABLEFILTER); |
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switch( ( phi & (MKI_TABLESIZE*3) ) ) { |
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case 0x0000: |
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// rising quarter wave Shape A
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return sinLogTable[index]; |
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case MKI_TABLESIZE: |
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// falling quarter wave Shape B
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return sinLogTable[index ^ MKI_TABLEFILTER]; |
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case (MKI_TABLESIZE*2): |
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// rising quarter wave -ve Shape C
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return sinLogTable[index] | NEGATIVE_BIT; |
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default: |
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// falling quarter wave -ve Shape D
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return sinLogTable[index ^ MKI_TABLEFILTER] | NEGATIVE_BIT; |
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} |
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} |
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inline int32_t mkiSin(int32_t phase, uint16_t env) { |
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const uint16_t shift = 22 - MKI_BITDEPTH; |
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uint16_t expVal = sinLog(phase >> shift) + (env << 3); |
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const bool isSigned = expVal & NEGATIVE_BIT; |
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expVal &= ~NEGATIVE_BIT; |
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// expVal: 0..2137+511*8 = 0..6225
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// result: 0..1018+1024
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uint16_t result = 0x0400 + sinExpTable[( expVal & MKI_TABLEFILTER ) ^ MKI_TABLEFILTER]; |
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result <<= 1; |
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result >>= ( expVal >> 8 ); // exp
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uint32_t ret; |
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if( isSigned ) { |
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// -1 for one's complement
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ret = -result - 1; |
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} else { |
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ret = result; |
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} |
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return ret << shift; |
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} |
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void EngineMkI::compute(int32_t *output, const int32_t *input, |
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int32_t phase0, int32_t freq, |
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int32_t gain1, int32_t gain2, bool add, const Controllers *controllers) { |
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int32_t gain1, int32_t gain2, bool add) { |
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int32_t dgain = (gain2 - gain1 + (N >> 1)) >> LG_N; |
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int32_t gain = gain1; |
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int32_t phase = phase0; |
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if (add) { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = Sin::lookup(phase + input[i]); |
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int32_t y1 = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] += y1; |
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phase += freq; |
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} |
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} else { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = Sin::lookup(phase + input[i]); |
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int32_t y1 = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] = y1; |
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phase += freq; |
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} |
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const int32_t *adder = add ? output : zeros; |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = mkiSin((phase+input[i]), gain); |
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output[i] = y + adder[i]; |
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phase += freq; |
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} |
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} |
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void EngineMkI::compute_pure(int32_t *output, int32_t phase0, int32_t freq, |
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int32_t gain1, int32_t gain2, bool add, const Controllers *controllers) { |
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int32_t gain1, int32_t gain2, bool add) { |
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int32_t dgain = (gain2 - gain1 + (N >> 1)) >> LG_N; |
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int32_t gain = gain1; |
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int32_t phase = phase0; |
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if (add) { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = Sin::lookup(phase); |
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int32_t y1 = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] += y1; |
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phase += freq; |
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} |
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} else { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = Sin::lookup(phase); |
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int32_t y1 = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] = y1; |
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phase += freq; |
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} |
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const int32_t *adder = add ? output : zeros; |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t y = mkiSin(phase , gain); |
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output[i] = y + adder[i]; |
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phase += freq; |
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} |
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} |
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void EngineMkI::compute_fb(int32_t *output, int32_t phase0, int32_t freq, |
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int32_t gain1, int32_t gain2, |
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int32_t *fb_buf, int fb_shift, bool add, const Controllers *controllers) { |
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int32_t *fb_buf, int fb_shift, bool add) { |
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int32_t dgain = (gain2 - gain1 + (N >> 1)) >> LG_N; |
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int32_t gain = gain1; |
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int32_t phase = phase0; |
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const int32_t *adder = add ? output : zeros; |
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int32_t y0 = fb_buf[0]; |
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int32_t y = fb_buf[1]; |
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if (add) { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); |
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y0 = y; |
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y = Sin::lookup(phase + scaled_fb); |
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y = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] += y; |
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phase += freq; |
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} |
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} else { |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); |
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y0 = y; |
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y = Sin::lookup(phase + scaled_fb); |
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y = ((int64_t)y * (int64_t)gain) >> 24; |
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output[i] = y; |
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phase += freq; |
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} |
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for (int i = 0; i < N; i++) { |
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gain += dgain; |
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int32_t scaled_fb = (y0 + y) >> (fb_shift + 1); |
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y0 = y; |
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y = mkiSin((phase+scaled_fb), gain); |
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output[i] = y + adder[i]; |
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phase += freq; |
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} |
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fb_buf[0] = y0; |
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fb_buf[1] = y; |
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} |
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// exclusively used for ALGO 6 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, const Controllers *cont) { |
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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 dgain[2]; |
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int32_t gain[2]; |
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int32_t phase[2]; |
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@ -181,8 +188,43 @@ void EngineMkI::compute_fb2(int32_t *output, FmOpParams *parms, int32_t gain01, |
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fb_buf[1] = y; |
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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, const Controllers *cont) { |
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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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@ -230,10 +272,54 @@ void EngineMkI::compute_fb3(int32_t *output, FmOpParams *parms, int32_t gain01, |
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fb_buf[1] = y; |
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} |
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void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, |
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int32_t *fb_buf, int feedback_shift, const Controllers *controllers) { |
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const int kLevelThresh = 1120; |
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int32_t *fb_buf, int feedback_shift) { |
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const int kLevelThresh = 507; // really ????
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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 ? 511 : param.gain_out; |
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int32_t gain2 = 512-(param.level_in >> 19); |
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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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void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, int32_t *fb_buf, int feedback_shift) { |
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const int kLevelThresh = 507; |
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const FmAlgorithm alg = algo2[algorithm]; |
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bool has_contents[3] = { true, false, false }; |
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@ -244,8 +330,8 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, |
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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; |
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int32_t gain2 = Exp2::lookup(param.level_in - (14 * (1 << 24))); |
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int32_t gain1 = param.gain_out == 0 ? 511 : param.gain_out; |
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int32_t gain2 = 512-(param.level_in >> 19); |
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param.gain_out = gain2; |
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if (gain1 >= kLevelThresh || gain2 >= kLevelThresh) { |
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@ -261,13 +347,13 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int 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, controllers); |
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//compute_fb2(outptr, params, gain1, gain2, fb_buf, feedback_shift, controllers);
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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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case 3 : |
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compute_fb3(outptr, params, gain1, gain2, fb_buf, feedback_shift, controllers); |
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//compute_fb3(outptr, params, gain1, gain2, fb_buf, feedback_shift, controllers);
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params[1].phase += params[1].freq << LG_N; // hack, we already processed op-5 - op-4
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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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@ -275,18 +361,17 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, |
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default: |
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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, controllers); |
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compute_fb(outptr, param.phase, param.freq,gain1, gain2, fb_buf, feedback_shift, add); |
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break; |
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} |
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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, gain1, gain2, add, controllers); |
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compute_pure(outptr, param.phase, param.freq, 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, controllers); |
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compute(outptr, buf_[inbus - 1].get(), param.phase, param.freq, gain1, gain2, add); |
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} |
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has_contents[outbus] = true; |
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@ -297,4 +382,4 @@ void EngineMkI::render(int32_t *output, FmOpParams *params, int algorithm, |
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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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