engines/gig/Filter.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_FILTER_H__
#define __LS_GIG_FILTER_H__

#include "../../common/global.h"

#include <gig.h>

#include "../common/BiquadFilter.h"

// TODO: Gigasampler's "Turbo Lowpass" and "Bandreject" filters not implemented yet

#define LSF_BW 0.9
#define LSF_FB 0.9f

namespace LinuxSampler { namespace gig {

    /**
     * These are filters similar to the ones from Gigasampler.
     */
    class Filter {
        protected:
            BandpassFilter    BasicBPFilter;
            HighpassFilter    HPFilter;
            BandpassFilter    BPFilter;
            LowpassFilter     LPFilter;
            BiquadFilter*     pFilter;
            bq_t              scale;
            bq_t              resonance;
            bq_t              cutoff;
            ::gig::vcf_type_t Type;
            static const float fFB = LSF_FB;
        public:

            Filter() {
                // set filter type to 'lowpass' by default
                pFilter = &LPFilter;
                Type    = ::gig::vcf_type_lowpass;
            }

            inline bq_t Cutoff()     { return cutoff; }

            inline bq_t Resonance()  { return resonance; }

            inline void SetType(::gig::vcf_type_t FilterType) {
                switch (FilterType) {
                    case ::gig::vcf_type_highpass:
                        pFilter = &HPFilter;
                        break;
                    case ::gig::vcf_type_bandreject: //TODO: not implemented yet
                        FilterType = ::gig::vcf_type_bandpass;
                    case ::gig::vcf_type_bandpass:
                        pFilter = &BPFilter;
                        break;
                    case ::gig::vcf_type_lowpassturbo: //TODO: not implemented yet
                    default:
                        FilterType = ::gig::vcf_type_lowpass;
                    case ::gig::vcf_type_lowpass:
                        pFilter = &LPFilter;

                }
                Type = FilterType;
            }

            inline void SetParameters(bq_t cutoff, bq_t resonance, bq_t fs) {
                BasicBPFilter.SetParameters(cutoff, 0.7, fs);
                switch (Type) {
                    case ::gig::vcf_type_highpass:
                        HPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                    case ::gig::vcf_type_bandpass:
                        BPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                    case ::gig::vcf_type_lowpass:
                        LPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                }
                this->scale     = 1.0f - resonance * 0.7f;
                this->resonance = resonance;
                this->cutoff    = cutoff;
            }

            inline void SetParameters(biquad_param_t* base, biquad_param_t* main, bq_t cutoff, bq_t resonance, bq_t fs) {
                BasicBPFilter.SetParameters(base, cutoff, 0.7, fs);
                switch (Type) {
                    case ::gig::vcf_type_highpass:
                        HPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                    case ::gig::vcf_type_bandpass:
                        BPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                    case ::gig::vcf_type_lowpass:
                        LPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
                        break;
                }
                this->scale     = 1.0f - resonance * 0.7f;
                this->resonance = resonance;
                this->cutoff    = cutoff;
            }

            void Reset() {
                BasicBPFilter.Reset();
                HPFilter.Reset();
                BPFilter.Reset();
                LPFilter.Reset();
            }

            inline bq_t Apply(const bq_t in) {
                return pFilter->Apply(in) * this->scale +
                        BasicBPFilter.ApplyFB(in, this->resonance * LSF_FB) * this->resonance;
            }

            inline bq_t Apply(biquad_param_t* base, biquad_param_t* main, const bq_t in) {
                return pFilter->Apply(main, in) * this->scale +
                        BasicBPFilter.ApplyFB(base, in, this->resonance * LSF_FB) * this->resonance;
            }

#if CONFIG_ASM && ARCH_X86
            // expects to find input in xmm0 and leaves output in xmm7
            inline void Apply4StepsSSE(biquad_param_t* base, biquad_param_t* main) {
                float fb;
                __asm__ __volatile__ (
                    "movss %0, %%xmm4\n\t"
                    "mulss %1, %%xmm4      # this->resonance * LSF_FB\n\t"
                    "movss %%xmm4, %2\n\t"
                    :: "m" (fFB),       /* %0 */
                       "m" (resonance), /* %1 */
                       "m" (fb)         /* %2 */
                );
                BasicBPFilter.ApplyFB4StepsSSE(base, fb); // leaves output in xmm7
                __asm__ __volatile__ (
                    "movss  %0, %%xmm4\n\t"
                    "shufps $0, %%xmm4, %%xmm4     # copy to other 3 cells\n\t"
                    "mulps  %%xmm4, %%xmm7         # ApplyFB() * this->resonance\n\t"
                    :: "m" (resonance) /* %0 */
                );
                pFilter->Apply4StepsSSE(main); // leaves output in xmm6
                __asm__ __volatile__ (
                    "movss  %0, %%xmm5\n\t"
                    "shufps $0, %%xmm5, %%xmm5     # copy to other 3 cells\n\t"
                    "mulps  %%xmm5, %%xmm6         # Apply() * this->scale\n\t"
                    "addps  %%xmm6, %%xmm7         # xmm7 = result\n\t"
                    :: "m" (scale) /* %0 */
                );
            }
#endif // CONFIG_ASM && ARCH_X86

    };

}} //namespace LinuxSampler::gig

#endif // __LS_GIG_FILTER_H__
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	505	* Copyright (C) 2005 Christian Schoenebeck *
7	schoenebeck	53	* *
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_FILTER_H__
25			#define __LS_GIG_FILTER_H__
26
27			#include "../../common/global.h"
28
29	schoenebeck	505	#include <gig.h>
30
31	schoenebeck	53	#include "../common/BiquadFilter.h"
32
33			// TODO: Gigasampler's "Turbo Lowpass" and "Bandreject" filters not implemented yet
34
35			#define LSF_BW 0.9
36			#define LSF_FB 0.9f
37
38			namespace LinuxSampler { namespace gig {
39
40			/**
41	schoenebeck	80	* These are filters similar to the ones from Gigasampler.
42	schoenebeck	53	*/
43			class Filter {
44			protected:
45			BandpassFilter BasicBPFilter;
46			HighpassFilter HPFilter;
47			BandpassFilter BPFilter;
48			LowpassFilter LPFilter;
49			BiquadFilter* pFilter;
50			bq_t scale;
51			bq_t resonance;
52			bq_t cutoff;
53			::gig::vcf_type_t Type;
54	schoenebeck	319	static const float fFB = LSF_FB;
55	schoenebeck	53	public:
56
57	schoenebeck	319	Filter() {
58	schoenebeck	53	// set filter type to 'lowpass' by default
59			pFilter = &LPFilter;
60			Type = ::gig::vcf_type_lowpass;
61			}
62
63			inline bq_t Cutoff() { return cutoff; }
64
65			inline bq_t Resonance() { return resonance; }
66
67			inline void SetType(::gig::vcf_type_t FilterType) {
68			switch (FilterType) {
69			case ::gig::vcf_type_highpass:
70			pFilter = &HPFilter;
71			break;
72			case ::gig::vcf_type_bandreject: //TODO: not implemented yet
73	schoenebeck	368	FilterType = ::gig::vcf_type_bandpass;
74	schoenebeck	53	case ::gig::vcf_type_bandpass:
75			pFilter = &BPFilter;
76			break;
77			case ::gig::vcf_type_lowpassturbo: //TODO: not implemented yet
78			default:
79	schoenebeck	368	FilterType = ::gig::vcf_type_lowpass;
80	schoenebeck	53	case ::gig::vcf_type_lowpass:
81			pFilter = &LPFilter;
82
83			}
84			Type = FilterType;
85			}
86
87			inline void SetParameters(bq_t cutoff, bq_t resonance, bq_t fs) {
88			BasicBPFilter.SetParameters(cutoff, 0.7, fs);
89			switch (Type) {
90			case ::gig::vcf_type_highpass:
91			HPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
92			break;
93			case ::gig::vcf_type_bandpass:
94			BPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
95			break;
96			case ::gig::vcf_type_lowpass:
97			LPFilter.SetParameters(cutoff, 1.0 - resonance * LSF_BW, fs);
98			break;
99			}
100			this->scale = 1.0f - resonance * 0.7f;
101			this->resonance = resonance;
102			this->cutoff = cutoff;
103			}
104
105	schoenebeck	80	inline void SetParameters(biquad_param_t* base, biquad_param_t* main, bq_t cutoff, bq_t resonance, bq_t fs) {
106			BasicBPFilter.SetParameters(base, cutoff, 0.7, fs);
107			switch (Type) {
108			case ::gig::vcf_type_highpass:
109			HPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
110			break;
111			case ::gig::vcf_type_bandpass:
112			BPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
113			break;
114			case ::gig::vcf_type_lowpass:
115			LPFilter.SetParameters(main, cutoff, 1.0 - resonance * LSF_BW, fs);
116			break;
117			}
118			this->scale = 1.0f - resonance * 0.7f;
119			this->resonance = resonance;
120			this->cutoff = cutoff;
121			}
122
123	schoenebeck	319	void Reset() {
124			BasicBPFilter.Reset();
125			HPFilter.Reset();
126			BPFilter.Reset();
127			LPFilter.Reset();
128			}
129
130	schoenebeck	53	inline bq_t Apply(const bq_t in) {
131	schoenebeck	319	return pFilter->Apply(in) * this->scale +
132			BasicBPFilter.ApplyFB(in, this->resonance * LSF_FB) * this->resonance;
133	schoenebeck	53	}
134	schoenebeck	80
135			inline bq_t Apply(biquad_param_t* base, biquad_param_t* main, const bq_t in) {
136	schoenebeck	319	return pFilter->Apply(main, in) * this->scale +
137			BasicBPFilter.ApplyFB(base, in, this->resonance * LSF_FB) * this->resonance;
138	schoenebeck	80	}
139	schoenebeck	319
140	schoenebeck	617	#if CONFIG_ASM && ARCH_X86
141	schoenebeck	319	// expects to find input in xmm0 and leaves output in xmm7
142			inline void Apply4StepsSSE(biquad_param_t* base, biquad_param_t* main) {
143			float fb;
144			__asm__ __volatile__ (
145			"movss %0, %%xmm4\n\t"
146			"mulss %1, %%xmm4 # this->resonance * LSF_FB\n\t"
147			"movss %%xmm4, %2\n\t"
148			:: "m" (fFB), /* %0 */
149			"m" (resonance), /* %1 */
150			"m" (fb) /* %2 */
151			);
152			BasicBPFilter.ApplyFB4StepsSSE(base, fb); // leaves output in xmm7
153			__asm__ __volatile__ (
154			"movss %0, %%xmm4\n\t"
155			"shufps $0, %%xmm4, %%xmm4 # copy to other 3 cells\n\t"
156			"mulps %%xmm4, %%xmm7 # ApplyFB() * this->resonance\n\t"
157			:: "m" (resonance) /* %0 */
158			);
159			pFilter->Apply4StepsSSE(main); // leaves output in xmm6
160			__asm__ __volatile__ (
161			"movss %0, %%xmm5\n\t"
162			"shufps $0, %%xmm5, %%xmm5 # copy to other 3 cells\n\t"
163			"mulps %%xmm5, %%xmm6 # Apply() * this->scale\n\t"
164			"addps %%xmm6, %%xmm7 # xmm7 = result\n\t"
165			:: "m" (scale) /* %0 */
166			);
167			}
168	schoenebeck	617	#endif // CONFIG_ASM && ARCH_X86
169	schoenebeck	328
170	schoenebeck	53	};
171
172			}} //namespace LinuxSampler::gig
173
174			#endif // __LS_GIG_FILTER_H__