engines/gig/Synthesizer.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_GIG_SYNTHESIZER_H__
#define __LS_GIG_SYNTHESIZER_H__

#include "../../common/global.h"
#include "../../common/RTMath.h"
#include "../common/Resampler.h"
#include "../common/BiquadFilter.h"
#include "Filter.h"
#include "Voice.h"

#define SYNTHESIS_MODE_SET_CONSTPITCH(iMode,bVal)       if (bVal) iMode |= 0x01; else iMode &= ~0x01   /* (un)set mode bit 0 */
#define SYNTHESIS_MODE_SET_LOOP(iMode,bVal)             if (bVal) iMode |= 0x02; else iMode &= ~0x02   /* (un)set mode bit 1 */
#define SYNTHESIS_MODE_SET_INTERPOLATE(iMode,bVal)      if (bVal) iMode |= 0x04; else iMode &= ~0x04   /* (un)set mode bit 2 */
#define SYNTHESIS_MODE_SET_FILTER(iMode,bVal)           if (bVal) iMode |= 0x08; else iMode &= ~0x08   /* (un)set mode bit 3 */
#define SYNTHESIS_MODE_SET_CHANNELS(iMode,bVal)         if (bVal) iMode |= 0x10; else iMode &= ~0x10   /* (un)set mode bit 4 */
#define SYNTHESIS_MODE_SET_IMPLEMENTATION(iMode,bVal)   if (bVal) iMode |= 0x20; else iMode &= ~0x20   /* (un)set mode bit 5 */
#define SYNTHESIS_MODE_SET_PROFILING(iMode,bVal)        if (bVal) iMode |= 0x40; else iMode &= ~0x40   /* (un)set mode bit 6 */

#define SYNTHESIS_MODE_GET_CONSTPITCH(iMode)            iMode & 0x01
#define SYNTHESIS_MODE_GET_LOOP(iMode)                  iMode & 0x02
#define SYNTHESIS_MODE_GET_INTERPOLATE(iMode)           iMode & 0x04
#define SYNTHESIS_MODE_GET_FILTER(iMode)                iMode & 0x08
#define SYNTHESIS_MODE_GET_CHANNELS(iMode)              iMode & 0x10
#define SYNTHESIS_MODE_GET_IMPLEMENTATION(iMode)        iMode & 0x20

// that's usually gig::Voice of course, but we make it a macro so we can
// include this code for our synthesis benchmark which uses fake data
// structures
#ifndef VOICE
# define VOICE Voice
#endif // VOICE

namespace LinuxSampler { namespace gig {

    typedef void SynthesizeFragment_Fn(VOICE&, uint, sample_t*, uint);

    void* GetSynthesisFunction(const int SynthesisMode);
    void RunSynthesisFunction(const int SynthesisMode, VOICE& voice, uint Samples, sample_t* pSrc, uint Skip);

    enum channels_t {
        MONO,
        STEREO
    };

    template<implementation_t IMPLEMENTATION, channels_t CHANNELS, bool USEFILTER, bool INTERPOLATE, bool DOLOOP, bool CONSTPITCH>
    class Synthesizer : public __RTMath<IMPLEMENTATION>, public LinuxSampler::Resampler<INTERPOLATE> {
        public:
            template<typename VOICE_T>
            inline static void SynthesizeFragment(VOICE_T& Voice, uint Samples, sample_t* pSrc, uint i) {
                const float panLeft  = Mul(Voice.PanLeft,  Voice.pEngineChannel->GlobalPanLeft);
                const float panRight = Mul(Voice.PanRight, Voice.pEngineChannel->GlobalPanRight);
                if (IMPLEMENTATION == ASM_X86_MMX_SSE) {
                    float fPos = (float) Voice.Pos;
                    SynthesizeFragment(Voice, Samples, pSrc, i, Voice.pSample->LoopPlayCount,
                                       Voice.pSample->LoopStart,
                                       Voice.pSample->LoopEnd,
                                       Voice.pSample->LoopSize,
                                       Voice.LoopCyclesLeft,
                                       (void *)&fPos,
                                       Voice.PitchBase,
                                       Voice.PitchBend,
                                       &panLeft, &panRight);
                    #if  ARCH_X86
                    if (INTERPOLATE) EMMS;
                    #endif
                    Voice.Pos = (double) fPos;
                } else {
                    SynthesizeFragment(Voice, Samples, pSrc, i, Voice.pSample->LoopPlayCount,
                                       Voice.pSample->LoopStart,
                                       Voice.pSample->LoopEnd,
                                       Voice.pSample->LoopSize,
                                       Voice.LoopCyclesLeft,
                                       (void *)&Voice.Pos,
                                       Voice.PitchBase,
                                       Voice.PitchBend,
                                       &panLeft, &panRight);
                }
            }

        //protected:

            template<typename VOICE_T>
            inline static void SynthesizeFragment(VOICE_T& Voice, uint Samples, sample_t* pSrc, uint& i, uint& LoopPlayCount, uint LoopStart, uint LoopEnd, uint LoopSize, uint& LoopCyclesLeft, void* Pos, float& PitchBase, float& PitchBend, const float* PanLeft, const float* PanRight) {
                const float loopEnd = Float(LoopEnd);
                const float PBbyPB = Mul(PitchBase, PitchBend);
                const float f_LoopStart = Float(LoopStart);
                const float f_LoopSize = Float(LoopSize);
                if (DOLOOP) {
                    if (LoopPlayCount) {
                        // render loop (loop count limited)
                        while (i < Samples && LoopCyclesLeft) {
                            if (CONSTPITCH) {
                                const uint processEnd = Min(Samples, i + DiffToLoopEnd(loopEnd,Pos, PBbyPB) + 1); //TODO: instead of +1 we could also round up
                                while (i < processEnd) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
                            }
                            else Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
                            if (WrapLoop(f_LoopStart, f_LoopSize, loopEnd, Pos)) LoopCyclesLeft--;
                        }
                        // render on without loop
                        while (i < Samples) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
                    }
                    else { // render loop (endless loop)
                        while (i < Samples) {
                            if (CONSTPITCH) {
                                const uint processEnd = Min(Samples, i + DiffToLoopEnd(loopEnd, Pos, PBbyPB) + 1); //TODO: instead of +1 we could also round up
                                while (i < processEnd) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
                            }
                            else Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
                            WrapLoop(f_LoopStart, f_LoopSize, loopEnd, Pos);
                        }
                    }
                }
                else { // no looping
                    while (i < Samples) { Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);}
                }
            }

            template<typename VOICE_T>
            inline static void Synthesize(VOICE_T& Voice, void* Pos, sample_t* pSrc, uint& i, const float* PanLeft, const float* PanRight) {
                Synthesize(pSrc, Pos,
                           Voice.pEngine->pSynthesisParameters[Event::destination_vco][i],
                           Voice.pEngineChannel->pOutputLeft,
                           Voice.pEngineChannel->pOutputRight,
                           i,
                           Voice.pEngine->pSynthesisParameters[Event::destination_vca],
                           PanLeft,
                           PanRight,
                           Voice.FilterLeft,
                           Voice.FilterRight,
                           Voice.pEngine->pBasicFilterParameters[i],
                           Voice.pEngine->pMainFilterParameters[i]);
            }

            inline static int DiffToLoopEnd(const float& LoopEnd, const void* Pos, const float& Pitch) {
                switch (IMPLEMENTATION) {
                    // pure C++ implementation (thus platform independent)
                    case CPP: {
                        return uint((LoopEnd - *((double *)Pos)) / Pitch);
                    }
                    #if ARCH_X86
                    case ASM_X86_MMX_SSE: {
                        int result;
                        __asm__ __volatile__ (
                            "movss    (%1), %%xmm0  #read loopend\n\t"
                            "subss    (%2), %%xmm0  #sub  pos\n\t"
                            "divss    (%3), %%xmm0  #div  by pitch\n\t"
                            "cvtss2si %%xmm0, %0    #convert to int\n\t"
                            : "=r" (result)   /* %0 */
                            : "r" (&LoopEnd), /* %1 */
                              "r" (Pos),      /* %2 */
                              "r" (&Pitch)    /* %3 */
                        );
                        return result;
                    }
                    #endif // ARCH_X86
                }
            }

            inline static int WrapLoop(const float& LoopStart, const float& LoopSize, const float& LoopEnd, void* vPos) {
                switch (IMPLEMENTATION) {
                    // pure C++ implementation (thus platform independent)
                    case CPP: {
                        double * Pos = (double *)vPos;
                        if (*Pos < LoopEnd) return 0;
                        *Pos = fmod(*Pos - LoopEnd, LoopSize) + LoopStart;
                        return 1;
                    }
                    #if ARCH_X86
                    case ASM_X86_MMX_SSE: {
                        int result = 0;
                        __asm__ __volatile__ (
                            "movss  (%2), %%xmm0          # load LoopEnd\n\t"
                            "movss  (%1), %%xmm1          # load Pos\n\t"
                            "comiss %%xmm0, %%xmm1      # LoopEnd <> Pos\n\t"
                            "jb     1f                  # jump if no work needs to be done\n\t"
                            "movss    (%3), %%xmm2        # load LoopSize\n\t"
                            "subss    %%xmm0, %%xmm1    # Pos - LoopEnd\n\t"
                            //now the fmodf
                            "movss    %%xmm1, %%xmm3    # xmm3 = (Pos - LoopEnd)\n\t"
                            "divss    %%xmm2, %%xmm1    # (Pos - LoopEnd) / LoopSize\n\t"
                            "cvttss2si %%xmm1, %%eax    # convert to int\n\t"
                            "cvtsi2ss  %%eax, %%xmm1    # convert back to float\n\t"
                            "movss    (%4), %%xmm0      # load LoopStart\n\t"
                            "mulss    %%xmm2, %%xmm1    # LoopSize * int((Pos-LoopEnd)/LoopSize)\n\t"
                            "subss    %%xmm1, %%xmm3    # xmm2 = fmodf(Pos - LoopEnd, LoopSize)\n\t"
                            //done with fmodf
                            "addss    %%xmm0, %%xmm3      # add LoopStart\n\t"
                            "movss    %%xmm3, (%1)        # update Pos\n\t"
                            "movl    $1, (%0)             # result = 1\n\t"
                            ".balign 16 \n\t"
                            "1:\n\t"
                            :: "r" (&result),   /* %0 */
                              "r"  (vPos),      /* %1 */
                              "r"  (&LoopEnd),  /* %2 */
                              "r"  (&LoopSize), /* %3 */
                              "r"  (&LoopStart) /* %4 */
                        );
                        return result;
                    }
                    #endif // ARCH_X86
                }
            }

            inline static void Synthesize(sample_t* pSrc, void* Pos, float& Pitch, float* pOutL, float* pOutR, uint& i, float* Volume, const float* PanL, const float* PanR, Filter& FilterL, Filter& FilterR, biquad_param_t& bqBase, biquad_param_t& bqMain) {
                switch (IMPLEMENTATION) {
                    // pure C++ implementation (thus platform independent)
                    case CPP: {
                        switch (CHANNELS) {
                            case MONO: {
                                float samplePoint = GetNextSampleMonoCPP(pSrc, (double *)Pos, Pitch);
                                if (USEFILTER) samplePoint = FilterL.Apply(&bqBase, &bqMain, samplePoint);
                                pOutL[i] += samplePoint * Volume[i] * *PanL;
                                pOutR[i] += samplePoint * Volume[i] * *PanR;
                                i++;
                                break;
                            }
                            case STEREO: {
                                stereo_sample_t samplePoint = GetNextSampleStereoCPP(pSrc, (double *)Pos, Pitch);
                                if (USEFILTER) {
                                    samplePoint.left  = FilterL.Apply(&bqBase, &bqMain, samplePoint.left);
                                    samplePoint.right = FilterR.Apply(&bqBase, &bqMain, samplePoint.right);
                                }
                                pOutL[i] += samplePoint.left  * Volume[i] * *PanL;
                                pOutR[i] += samplePoint.right * Volume[i] * *PanR;
                                i++;
                                break;
                            }
                        }
                        break;
                    }
                    #if ARCH_X86
                    // Assembly optimization using the MMX & SSE(1) instruction set (thus only for x86)
                    case ASM_X86_MMX_SSE: {
                        const int ii = i & 0xfffffffc;
                        i += 4;
                        switch (CHANNELS) {
                            case MONO: {
                                GetNext4SamplesMonoMMXSSE(pSrc, (float *)Pos, Pitch); // outputs samples in xmm2
                                if (USEFILTER) {
                                    /* prepare filter input */
                                    __asm__ __volatile__ (
                                        "movaps %xmm2,%xmm0"
                                    );
                                    FilterL.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
                                    __asm__ __volatile__ (
                                        "movaps %xmm7,%xmm2       # mono filter result -> xmm2"
                                    );
                                }
                                /* apply panorama and volume factors */
                                __asm__ __volatile__ (
                                    "movss    (%1),%%xmm0             # load pan left\n\t"
                                    "movss    (%2),%%xmm1             # load pan right\n\t"
                                    "movaps   (%0),%%xmm4             # load vca\n\t"
                                    "shufps   $0x00,%%xmm0,%%xmm0     # copy pan left to the other 3 cells\n\t"
                                    "shufps   $0x00,%%xmm1,%%xmm1     # copy pan right to the other 3 cells\n\t"
                                    "mulps    %%xmm2,%%xmm0           # left  = sample * pan_left\n\t"
                                    "mulps    %%xmm2,%%xmm1           # right = sample * pan_right\n\t"
                                    "mulps    %%xmm4,%%xmm0           # left  = vca * (sample * pan_left)\n\t"
                                    "mulps    %%xmm4,%%xmm1           # right = vca * (sample * pan_right)\n\t"
                                    : /* no output */
                                    : "r" (&Volume[ii]), /* %0 */
                                      "r" (PanL),   /* %1 */
                                      "r" (PanR)    /* %2 */
                                    : "xmm0", /* holds final left  sample (for the 4 samples) at the end */
                                      "xmm1"  /* holds final right sample (for the 4 samples) at the end */
                                );
                                break;
                            }
                            case STEREO: {
                                GetNext4SamplesStereoMMXSSE(pSrc, (float *)Pos, Pitch); // outputs samples in xmm2 (left channel) and xmm3 (right channel)
                                if (USEFILTER) {
                                    __asm__ __volatile__ (
                                        "movaps %xmm2,%xmm0     # prepare left channel for filter\n\t"
                                        "movaps %xmm3,%xmm1     # save right channel not to get overwritten by filter algorithms\n\t"
                                    );
                                    FilterL.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
                                    __asm__ __volatile__ (
                                        "movaps %xmm1,%xmm0     # prepare right channel for filter\n\t"
                                        "movaps %xmm7,%xmm1     # save filter output for left channel\n\t"
                                    );
                                    FilterR.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
                                    __asm__ __volatile__ (
                                        "movaps %xmm1,%xmm2     # result left channel -> xmm2\n\t"
                                        "movaps %xmm7,%xmm3     # result right channel -> xmm3\n\t"
                                    );
                                }
                                /* apply panorama and volume factors */
                                __asm__ __volatile__ (
                                    "movss    (%1),%%xmm0             # load pan left\n\t"
                                    "movss    (%2),%%xmm1             # load pan right\n\t"
                                    "movaps   (%0),%%xmm4             # load vca\n\t"
                                    "shufps   $0x00,%%xmm0,%%xmm0     # copy pan left to the other 3 cells\n\t"
                                    "shufps   $0x00,%%xmm1,%%xmm1     # copy pan right to the other 3 cells\n\t"
                                    "mulps    %%xmm2,%%xmm0           # left  = sample_left  * pan_left\n\t"
                                    "mulps    %%xmm3,%%xmm1           # right = sample_right * pan_right\n\t"
                                    "mulps    %%xmm4,%%xmm0           # left  = vca * (sample_left  * pan_left)\n\t"
                                    "mulps    %%xmm4,%%xmm1           # right = vca * (sample_right * pan_right)\n\t"
                                    : /* no output */
                                    : "r" (&Volume[ii]), /* %0 */
                                      "r" (PanL),   /* %1 */
                                      "r" (PanR)    /* %2 */
                                );
                                break;
                            }
                        }
                        /* mix the 4 samples to the output channels */
                        __asm__ __volatile__ (
                            "addps  (%0),%%xmm0       # mix calculated sample(s) to output left\n\t"
                            "movaps %%xmm0,(%0)       # output to left channel\n\t"
                            "addps  (%1),%%xmm1       # mix calculated sample(s) to output right\n\t"
                            "movaps %%xmm1,(%1)       # output to right channel\n\t"
                            : /* no output */
                            : "r" (&pOutL[ii]), /* %0 - must be 16 byte aligned ! */
                              "r" (&pOutR[ii])  /* %1 - must be 16 byte aligned ! */
                        );
                    }
                    #endif // ARCH_X86
                }
            }
    };

}} // namespace LinuxSampler::gig

#endif // __LS_GIG_SYNTHESIZER_H__
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#ifndef __LS_GIG_SYNTHESIZER_H__
25	#define __LS_GIG_SYNTHESIZER_H__
26
27	#include "../../common/global.h"
28	#include "../../common/RTMath.h"
29	#include "../common/Resampler.h"
30	#include "../common/BiquadFilter.h"
31	#include "Filter.h"
32	#include "Voice.h"
33
34	#define SYNTHESIS_MODE_SET_CONSTPITCH(iMode,bVal) if (bVal) iMode \|= 0x01; else iMode &= ~0x01 /* (un)set mode bit 0 */
35	#define SYNTHESIS_MODE_SET_LOOP(iMode,bVal) if (bVal) iMode \|= 0x02; else iMode &= ~0x02 /* (un)set mode bit 1 */
36	#define SYNTHESIS_MODE_SET_INTERPOLATE(iMode,bVal) if (bVal) iMode \|= 0x04; else iMode &= ~0x04 /* (un)set mode bit 2 */
37	#define SYNTHESIS_MODE_SET_FILTER(iMode,bVal) if (bVal) iMode \|= 0x08; else iMode &= ~0x08 /* (un)set mode bit 3 */
38	#define SYNTHESIS_MODE_SET_CHANNELS(iMode,bVal) if (bVal) iMode \|= 0x10; else iMode &= ~0x10 /* (un)set mode bit 4 */
39	#define SYNTHESIS_MODE_SET_IMPLEMENTATION(iMode,bVal) if (bVal) iMode \|= 0x20; else iMode &= ~0x20 /* (un)set mode bit 5 */
40	#define SYNTHESIS_MODE_SET_PROFILING(iMode,bVal) if (bVal) iMode \|= 0x40; else iMode &= ~0x40 /* (un)set mode bit 6 */
41
42	#define SYNTHESIS_MODE_GET_CONSTPITCH(iMode) iMode & 0x01
43	#define SYNTHESIS_MODE_GET_LOOP(iMode) iMode & 0x02
44	#define SYNTHESIS_MODE_GET_INTERPOLATE(iMode) iMode & 0x04
45	#define SYNTHESIS_MODE_GET_FILTER(iMode) iMode & 0x08
46	#define SYNTHESIS_MODE_GET_CHANNELS(iMode) iMode & 0x10
47	#define SYNTHESIS_MODE_GET_IMPLEMENTATION(iMode) iMode & 0x20
48
49	// that's usually gig::Voice of course, but we make it a macro so we can
50	// include this code for our synthesis benchmark which uses fake data
51	// structures
52	#ifndef VOICE
53	# define VOICE Voice
54	#endif // VOICE
55
56	namespace LinuxSampler { namespace gig {
57
58	typedef void SynthesizeFragment_Fn(VOICE&, uint, sample_t*, uint);
59
60	void* GetSynthesisFunction(const int SynthesisMode);
61	void RunSynthesisFunction(const int SynthesisMode, VOICE& voice, uint Samples, sample_t* pSrc, uint Skip);
62
63	enum channels_t {
64	MONO,
65	STEREO
66	};
67
68	template<implementation_t IMPLEMENTATION, channels_t CHANNELS, bool USEFILTER, bool INTERPOLATE, bool DOLOOP, bool CONSTPITCH>
69	class Synthesizer : public __RTMath<IMPLEMENTATION>, public LinuxSampler::Resampler<INTERPOLATE> {
70	public:
71	template<typename VOICE_T>
72	inline static void SynthesizeFragment(VOICE_T& Voice, uint Samples, sample_t* pSrc, uint i) {
73	const float panLeft = Mul(Voice.PanLeft, Voice.pEngineChannel->GlobalPanLeft);
74	const float panRight = Mul(Voice.PanRight, Voice.pEngineChannel->GlobalPanRight);
75	if (IMPLEMENTATION == ASM_X86_MMX_SSE) {
76	float fPos = (float) Voice.Pos;
77	SynthesizeFragment(Voice, Samples, pSrc, i, Voice.pSample->LoopPlayCount,
78	Voice.pSample->LoopStart,
79	Voice.pSample->LoopEnd,
80	Voice.pSample->LoopSize,
81	Voice.LoopCyclesLeft,
82	(void *)&fPos,
83	Voice.PitchBase,
84	Voice.PitchBend,
85	&panLeft, &panRight);
86	#if ARCH_X86
87	if (INTERPOLATE) EMMS;
88	#endif
89	Voice.Pos = (double) fPos;
90	} else {
91	SynthesizeFragment(Voice, Samples, pSrc, i, Voice.pSample->LoopPlayCount,
92	Voice.pSample->LoopStart,
93	Voice.pSample->LoopEnd,
94	Voice.pSample->LoopSize,
95	Voice.LoopCyclesLeft,
96	(void *)&Voice.Pos,
97	Voice.PitchBase,
98	Voice.PitchBend,
99	&panLeft, &panRight);
100	}
101	}
102
103	//protected:
104
105	template<typename VOICE_T>
106	inline static void SynthesizeFragment(VOICE_T& Voice, uint Samples, sample_t* pSrc, uint& i, uint& LoopPlayCount, uint LoopStart, uint LoopEnd, uint LoopSize, uint& LoopCyclesLeft, void* Pos, float& PitchBase, float& PitchBend, const float* PanLeft, const float* PanRight) {
107	const float loopEnd = Float(LoopEnd);
108	const float PBbyPB = Mul(PitchBase, PitchBend);
109	const float f_LoopStart = Float(LoopStart);
110	const float f_LoopSize = Float(LoopSize);
111	if (DOLOOP) {
112	if (LoopPlayCount) {
113	// render loop (loop count limited)
114	while (i < Samples && LoopCyclesLeft) {
115	if (CONSTPITCH) {
116	const uint processEnd = Min(Samples, i + DiffToLoopEnd(loopEnd,Pos, PBbyPB) + 1); //TODO: instead of +1 we could also round up
117	while (i < processEnd) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
118	}
119	else Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
120	if (WrapLoop(f_LoopStart, f_LoopSize, loopEnd, Pos)) LoopCyclesLeft--;
121	}
122	// render on without loop
123	while (i < Samples) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
124	}
125	else { // render loop (endless loop)
126	while (i < Samples) {
127	if (CONSTPITCH) {
128	const uint processEnd = Min(Samples, i + DiffToLoopEnd(loopEnd, Pos, PBbyPB) + 1); //TODO: instead of +1 we could also round up
129	while (i < processEnd) Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
130	}
131	else Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);
132	WrapLoop(f_LoopStart, f_LoopSize, loopEnd, Pos);
133	}
134	}
135	}
136	else { // no looping
137	while (i < Samples) { Synthesize(Voice, Pos, pSrc, i, PanLeft, PanRight);}
138	}
139	}
140
141	template<typename VOICE_T>
142	inline static void Synthesize(VOICE_T& Voice, void* Pos, sample_t* pSrc, uint& i, const float* PanLeft, const float* PanRight) {
143	Synthesize(pSrc, Pos,
144	Voice.pEngine->pSynthesisParameters[Event::destination_vco][i],
145	Voice.pEngineChannel->pOutputLeft,
146	Voice.pEngineChannel->pOutputRight,
147	i,
148	Voice.pEngine->pSynthesisParameters[Event::destination_vca],
149	PanLeft,
150	PanRight,
151	Voice.FilterLeft,
152	Voice.FilterRight,
153	Voice.pEngine->pBasicFilterParameters[i],
154	Voice.pEngine->pMainFilterParameters[i]);
155	}
156
157	inline static int DiffToLoopEnd(const float& LoopEnd, const void* Pos, const float& Pitch) {
158	switch (IMPLEMENTATION) {
159	// pure C++ implementation (thus platform independent)
160	case CPP: {
161	return uint((LoopEnd - ((double )Pos)) / Pitch);
162	}
163	#if ARCH_X86
164	case ASM_X86_MMX_SSE: {
165	int result;
166	__asm__ __volatile__ (
167	"movss (%1), %%xmm0 #read loopend\n\t"
168	"subss (%2), %%xmm0 #sub pos\n\t"
169	"divss (%3), %%xmm0 #div by pitch\n\t"
170	"cvtss2si %%xmm0, %0 #convert to int\n\t"
171	: "=r" (result) /* %0 */
172	: "r" (&LoopEnd), /* %1 */
173	"r" (Pos), /* %2 */
174	"r" (&Pitch) /* %3 */
175	);
176	return result;
177	}
178	#endif // ARCH_X86
179	}
180	}
181
182	inline static int WrapLoop(const float& LoopStart, const float& LoopSize, const float& LoopEnd, void* vPos) {
183	switch (IMPLEMENTATION) {
184	// pure C++ implementation (thus platform independent)
185	case CPP: {
186	double * Pos = (double *)vPos;
187	if (*Pos < LoopEnd) return 0;
188	Pos = fmod(Pos - LoopEnd, LoopSize) + LoopStart;
189	return 1;
190	}
191	#if ARCH_X86
192	case ASM_X86_MMX_SSE: {
193	int result = 0;
194	__asm__ __volatile__ (
195	"movss (%2), %%xmm0 # load LoopEnd\n\t"
196	"movss (%1), %%xmm1 # load Pos\n\t"
197	"comiss %%xmm0, %%xmm1 # LoopEnd <> Pos\n\t"
198	"jb 1f # jump if no work needs to be done\n\t"
199	"movss (%3), %%xmm2 # load LoopSize\n\t"
200	"subss %%xmm0, %%xmm1 # Pos - LoopEnd\n\t"
201	//now the fmodf
202	"movss %%xmm1, %%xmm3 # xmm3 = (Pos - LoopEnd)\n\t"
203	"divss %%xmm2, %%xmm1 # (Pos - LoopEnd) / LoopSize\n\t"
204	"cvttss2si %%xmm1, %%eax # convert to int\n\t"
205	"cvtsi2ss %%eax, %%xmm1 # convert back to float\n\t"
206	"movss (%4), %%xmm0 # load LoopStart\n\t"
207	"mulss %%xmm2, %%xmm1 # LoopSize * int((Pos-LoopEnd)/LoopSize)\n\t"
208	"subss %%xmm1, %%xmm3 # xmm2 = fmodf(Pos - LoopEnd, LoopSize)\n\t"
209	//done with fmodf
210	"addss %%xmm0, %%xmm3 # add LoopStart\n\t"
211	"movss %%xmm3, (%1) # update Pos\n\t"
212	"movl $1, (%0) # result = 1\n\t"
213	".balign 16 \n\t"
214	"1:\n\t"
215	:: "r" (&result), /* %0 */
216	"r" (vPos), /* %1 */
217	"r" (&LoopEnd), /* %2 */
218	"r" (&LoopSize), /* %3 */
219	"r" (&LoopStart) /* %4 */
220	);
221	return result;
222	}
223	#endif // ARCH_X86
224	}
225	}
226
227	inline static void Synthesize(sample_t* pSrc, void* Pos, float& Pitch, float* pOutL, float* pOutR, uint& i, float* Volume, const float* PanL, const float* PanR, Filter& FilterL, Filter& FilterR, biquad_param_t& bqBase, biquad_param_t& bqMain) {
228	switch (IMPLEMENTATION) {
229	// pure C++ implementation (thus platform independent)
230	case CPP: {
231	switch (CHANNELS) {
232	case MONO: {
233	float samplePoint = GetNextSampleMonoCPP(pSrc, (double *)Pos, Pitch);
234	if (USEFILTER) samplePoint = FilterL.Apply(&bqBase, &bqMain, samplePoint);
235	pOutL[i] += samplePoint * Volume[i] * *PanL;
236	pOutR[i] += samplePoint * Volume[i] * *PanR;
237	i++;
238	break;
239	}
240	case STEREO: {
241	stereo_sample_t samplePoint = GetNextSampleStereoCPP(pSrc, (double *)Pos, Pitch);
242	if (USEFILTER) {
243	samplePoint.left = FilterL.Apply(&bqBase, &bqMain, samplePoint.left);
244	samplePoint.right = FilterR.Apply(&bqBase, &bqMain, samplePoint.right);
245	}
246	pOutL[i] += samplePoint.left * Volume[i] * *PanL;
247	pOutR[i] += samplePoint.right * Volume[i] * *PanR;
248	i++;
249	break;
250	}
251	}
252	break;
253	}
254	#if ARCH_X86
255	// Assembly optimization using the MMX & SSE(1) instruction set (thus only for x86)
256	case ASM_X86_MMX_SSE: {
257	const int ii = i & 0xfffffffc;
258	i += 4;
259	switch (CHANNELS) {
260	case MONO: {
261	GetNext4SamplesMonoMMXSSE(pSrc, (float *)Pos, Pitch); // outputs samples in xmm2
262	if (USEFILTER) {
263	/* prepare filter input */
264	__asm__ __volatile__ (
265	"movaps %xmm2,%xmm0"
266	);
267	FilterL.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
268	__asm__ __volatile__ (
269	"movaps %xmm7,%xmm2 # mono filter result -> xmm2"
270	);
271	}
272	/* apply panorama and volume factors */
273	__asm__ __volatile__ (
274	"movss (%1),%%xmm0 # load pan left\n\t"
275	"movss (%2),%%xmm1 # load pan right\n\t"
276	"movaps (%0),%%xmm4 # load vca\n\t"
277	"shufps $0x00,%%xmm0,%%xmm0 # copy pan left to the other 3 cells\n\t"
278	"shufps $0x00,%%xmm1,%%xmm1 # copy pan right to the other 3 cells\n\t"
279	"mulps %%xmm2,%%xmm0 # left = sample * pan_left\n\t"
280	"mulps %%xmm2,%%xmm1 # right = sample * pan_right\n\t"
281	"mulps %%xmm4,%%xmm0 # left = vca * (sample * pan_left)\n\t"
282	"mulps %%xmm4,%%xmm1 # right = vca * (sample * pan_right)\n\t"
283	: /* no output */
284	: "r" (&Volume[ii]), /* %0 */
285	"r" (PanL), /* %1 */
286	"r" (PanR) /* %2 */
287	: "xmm0", /* holds final left sample (for the 4 samples) at the end */
288	"xmm1" /* holds final right sample (for the 4 samples) at the end */
289	);
290	break;
291	}
292	case STEREO: {
293	GetNext4SamplesStereoMMXSSE(pSrc, (float *)Pos, Pitch); // outputs samples in xmm2 (left channel) and xmm3 (right channel)
294	if (USEFILTER) {
295	__asm__ __volatile__ (
296	"movaps %xmm2,%xmm0 # prepare left channel for filter\n\t"
297	"movaps %xmm3,%xmm1 # save right channel not to get overwritten by filter algorithms\n\t"
298	);
299	FilterL.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
300	__asm__ __volatile__ (
301	"movaps %xmm1,%xmm0 # prepare right channel for filter\n\t"
302	"movaps %xmm7,%xmm1 # save filter output for left channel\n\t"
303	);
304	FilterR.Apply4StepsSSE(&bqBase, &bqMain); // xmm0 input, xmm7 output
305	__asm__ __volatile__ (
306	"movaps %xmm1,%xmm2 # result left channel -> xmm2\n\t"
307	"movaps %xmm7,%xmm3 # result right channel -> xmm3\n\t"
308	);
309	}
310	/* apply panorama and volume factors */
311	__asm__ __volatile__ (
312	"movss (%1),%%xmm0 # load pan left\n\t"
313	"movss (%2),%%xmm1 # load pan right\n\t"
314	"movaps (%0),%%xmm4 # load vca\n\t"
315	"shufps $0x00,%%xmm0,%%xmm0 # copy pan left to the other 3 cells\n\t"
316	"shufps $0x00,%%xmm1,%%xmm1 # copy pan right to the other 3 cells\n\t"
317	"mulps %%xmm2,%%xmm0 # left = sample_left * pan_left\n\t"
318	"mulps %%xmm3,%%xmm1 # right = sample_right * pan_right\n\t"
319	"mulps %%xmm4,%%xmm0 # left = vca * (sample_left * pan_left)\n\t"
320	"mulps %%xmm4,%%xmm1 # right = vca * (sample_right * pan_right)\n\t"
321	: /* no output */
322	: "r" (&Volume[ii]), /* %0 */
323	"r" (PanL), /* %1 */
324	"r" (PanR) /* %2 */
325	);
326	break;
327	}
328	}
329	/* mix the 4 samples to the output channels */
330	__asm__ __volatile__ (
331	"addps (%0),%%xmm0 # mix calculated sample(s) to output left\n\t"
332	"movaps %%xmm0,(%0) # output to left channel\n\t"
333	"addps (%1),%%xmm1 # mix calculated sample(s) to output right\n\t"
334	"movaps %%xmm1,(%1) # output to right channel\n\t"
335	: /* no output */
336	: "r" (&pOutL[ii]), /* %0 - must be 16 byte aligned ! */
337	"r" (&pOutR[ii]) /* %1 - must be 16 byte aligned ! */
338	);
339	}
340	#endif // ARCH_X86
341	}
342	}
343	};
344
345	}} // namespace LinuxSampler::gig
346
347	#endif // __LS_GIG_SYNTHESIZER_H__