engines/common/LFOSawIntMathOld.h

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *   Copyright (C) 2011 Christian Schoenebeck and Grigor Iliev             *
 *                                                                         *
 *   This library 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 library 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 library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_SAWLFO_H__
#define __LS_SAWLFO_H__

#include "LFOBase.h"

namespace LinuxSampler {

    /** @brief Saw LFO (int math implementation)
     *
     * This is a saw Low Frequency Oscillator which uses pure integer
     * math (without branches) to synthesize the saw wave.
     */
    template<LFO::range_type_t RANGE, bool SAWUP>
    class SawLFO : public LFOBase<RANGE> {
        public:

            /**
             * Constructor
             *
             * @param Max - maximum value of the output levels
             */
            SawLFO(float Max) : LFOBase<RANGE>::LFOBase(Max) {
            }

            /**
             * Calculates exactly one sample point of the LFO wave.
             *
             * @returns next LFO level
             */
            inline float render() {
                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                
                uiLevel += c;
                if (RANGE == LFO::range_unsigned)
                    return normalizer * (float) (SAWUP ? uiLevel : intLimit - uiLevel);
                else /* signed range */
                    return normalizer * (float) (SAWUP ? uiLevel : intLimit - uiLevel) + offset;
            }

            /**
             * Update LFO depth with a new external controller value.
             *
             * @param ExtControlValue - new external controller value
             */
            inline void updateByMIDICtrlValue(const uint16_t& ExtControlValue) {
                this->ExtControlValue = ExtControlValue;

                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                const float max = (this->InternalDepth + ExtControlValue * this->ExtControlDepthCoeff) * this->ScriptDepthFactor;
                if (RANGE == LFO::range_unsigned) {
                    normalizer = max / (float) intLimit;
                } else { // signed range
                    normalizer = max / (float) intLimit * 2.0f;
                    offset     = -max;
                }
            }
            
            /**
             * Will be called by the voice when the key / voice was triggered.
             *
             * @param Frequency       - frequency of the oscillator in Hz
             * @param StartLevel      - not implemented
             * @param InternalDepth   - firm, internal oscillator amplitude
             * @param ExtControlDepth - defines how strong the external MIDI
             *                          controller has influence on the
             *                          oscillator amplitude
             * @param FlipPhase       - not implemented
             * @param SampleRate      - current sample rate of the engines
             *                          audio output signal
             */
            virtual void trigger(float Frequency, LFO::start_level_t StartLevel, uint16_t InternalDepth, uint16_t ExtControlDepth, bool FlipPhase, unsigned int SampleRate) {
                this->Frequency            = Frequency;
                this->InternalDepth        = (InternalDepth / 1200.0f) * this->Max;
                this->ExtControlDepthCoeff = (((float) ExtControlDepth / 1200.0f) / 127.0f) * this->Max;
                this->ScriptFrequencyFactor = this->ScriptDepthFactor = 1.f; // reset for new voice
                this->pFinalDepth = NULL;
                this->pFinalFrequency = NULL;

                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                const float freq = Frequency * this->ScriptFrequencyFactor;
                const float r = freq / (float) SampleRate; // frequency alteration quotient
                c = (int) (intLimit * r);

                uiLevel = 0;
            }
            
            /**
             * Should be invoked after the LFO is triggered.
             * @param phase From 0 to 360 degrees.
             */
            void setPhase(float phase) {
                if (phase < 0) phase = 0;
                if (phase > 360) phase = 360;
                phase /= 360.0f;
                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                uiLevel = intLimit * phase;
            }
            
            void setFrequency(float Frequency, unsigned int SampleRate) {
                this->Frequency = Frequency;
                const float freq = Frequency * this->ScriptFrequencyFactor;
                const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
                float r = freq / (float) SampleRate; // frequency alteration quotient
                c = (int) (intLimit * r);
            }

            void setScriptDepthFactor(float factor, bool isFinal) {
                this->ScriptDepthFactor = factor;
                // set or reset this script depth parameter to be the sole
                // source for the LFO depth
                if (isFinal && !this->pFinalDepth)
                    this->pFinalDepth = &this->ScriptDepthFactor;
                else if (!isFinal && this->pFinalDepth == &this->ScriptDepthFactor)
                    this->pFinalDepth = NULL;
                // recalculate upon new depth
                updateByMIDICtrlValue(this->ExtControlValue);
            }

            void setScriptFrequencyFactor(float factor, unsigned int SampleRate) {
                this->ScriptFrequencyFactor = factor;
                // in case script frequency was set as "final" value before,
                // reset it so that all sources are processed from now on
                if (this->pFinalFrequency == &this->ScriptFrequencyFactor)
                    this->pFinalFrequency = NULL;
                // recalculate upon new frequency
                setFrequency(this->Frequency, SampleRate);
            }

            void setScriptFrequencyFinal(float hz, unsigned int SampleRate) {
                this->ScriptFrequencyFactor = hz;
                // assign script's given frequency as sole source for the LFO
                // frequency, thus ignore all other sources
                if (!this->pFinalFrequency)
                    this->pFinalFrequency = &this->ScriptFrequencyFactor;
                // recalculate upon new frequency
                setFrequency(this->Frequency, SampleRate);
            }

        protected:
            unsigned int uiLevel;
            int   c;
            float offset; ///< only needed for signed range
            float normalizer;
    };
    
    
    template<LFO::range_type_t RANGE>
    class SawUpLFO : public SawLFO<RANGE, true> {
        public:
            SawUpLFO(float Max) : SawLFO<RANGE, true>::SawLFO(Max) { }
    };
    
    template<LFO::range_type_t RANGE>
    class SawDownLFO : public SawLFO<RANGE, false> {
        public:
            SawDownLFO(float Max) : SawLFO<RANGE, false>::SawLFO(Max) { }
    };

} // namespace LinuxSampler

#endif // __LS_SAWLFO_H__
1	iliev	2223	/***************************************************************************
2			* *
3			* Copyright (C) 2005 Christian Schoenebeck *
4			* Copyright (C) 2011 Christian Schoenebeck and Grigor Iliev *
5			* *
6			* This library is free software; you can redistribute it and/or modify *
7			* it under the terms of the GNU General Public License as published by *
8			* the Free Software Foundation; either version 2 of the License, or *
9			* (at your option) any later version. *
10			* *
11			* This library is distributed in the hope that it will be useful, *
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
14			* GNU General Public License for more details. *
15			* *
16			* You should have received a copy of the GNU General Public License *
17			* along with this library; if not, write to the Free Software *
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
19			* MA 02111-1307 USA *
20			***************************************************************************/
21
22			#ifndef __LS_SAWLFO_H__
23			#define __LS_SAWLFO_H__
24
25			#include "LFOBase.h"
26
27			namespace LinuxSampler {
28
29			/** @brief Saw LFO (int math implementation)
30			*
31			* This is a saw Low Frequency Oscillator which uses pure integer
32			* math (without branches) to synthesize the saw wave.
33			*/
34	schoenebeck	3612	template<LFO::range_type_t RANGE, bool SAWUP>
35	iliev	2223	class SawLFO : public LFOBase<RANGE> {
36			public:
37
38			/**
39			* Constructor
40			*
41			* @param Max - maximum value of the output levels
42			*/
43			SawLFO(float Max) : LFOBase<RANGE>::LFOBase(Max) {
44			}
45
46			/**
47			* Calculates exactly one sample point of the LFO wave.
48			*
49			* @returns next LFO level
50			*/
51			inline float render() {
52			const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
53
54			uiLevel += c;
55	schoenebeck	3612	if (RANGE == LFO::range_unsigned)
56	iliev	2223	return normalizer * (float) (SAWUP ? uiLevel : intLimit - uiLevel);
57			else /* signed range */
58			return normalizer * (float) (SAWUP ? uiLevel : intLimit - uiLevel) + offset;
59			}
60
61			/**
62			* Update LFO depth with a new external controller value.
63			*
64			* @param ExtControlValue - new external controller value
65			*/
66	schoenebeck	3118	inline void updateByMIDICtrlValue(const uint16_t& ExtControlValue) {
67			this->ExtControlValue = ExtControlValue;
68
69	iliev	2223	const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
70	schoenebeck	3118	const float max = (this->InternalDepth + ExtControlValue * this->ExtControlDepthCoeff) * this->ScriptDepthFactor;
71	schoenebeck	3612	if (RANGE == LFO::range_unsigned) {
72	iliev	2223	normalizer = max / (float) intLimit;
73			} else { // signed range
74			normalizer = max / (float) intLimit * 2.0f;
75			offset = -max;
76			}
77			}
78
79			/**
80			* Will be called by the voice when the key / voice was triggered.
81			*
82			* @param Frequency - frequency of the oscillator in Hz
83			* @param StartLevel - not implemented
84			* @param InternalDepth - firm, internal oscillator amplitude
85			* @param ExtControlDepth - defines how strong the external MIDI
86			* controller has influence on the
87			* oscillator amplitude
88			* @param FlipPhase - not implemented
89			* @param SampleRate - current sample rate of the engines
90			* audio output signal
91			*/
92	schoenebeck	3612	virtual void trigger(float Frequency, LFO::start_level_t StartLevel, uint16_t InternalDepth, uint16_t ExtControlDepth, bool FlipPhase, unsigned int SampleRate) {
93	schoenebeck	3118	this->Frequency = Frequency;
94	iliev	2223	this->InternalDepth = (InternalDepth / 1200.0f) * this->Max;
95			this->ExtControlDepthCoeff = (((float) ExtControlDepth / 1200.0f) / 127.0f) * this->Max;
96	schoenebeck	3118	this->ScriptFrequencyFactor = this->ScriptDepthFactor = 1.f; // reset for new voice
97	schoenebeck	3561	this->pFinalDepth = NULL;
98			this->pFinalFrequency = NULL;
99	iliev	2223
100			const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
101	schoenebeck	3118	const float freq = Frequency * this->ScriptFrequencyFactor;
102			const float r = freq / (float) SampleRate; // frequency alteration quotient
103	iliev	2223	c = (int) (intLimit * r);
104
105			uiLevel = 0;
106			}
107	iliev	2225
108			/**
109			* Should be invoked after the LFO is triggered.
110			* @param phase From 0 to 360 degrees.
111			*/
112			void setPhase(float phase) {
113			if (phase < 0) phase = 0;
114			if (phase > 360) phase = 360;
115			phase /= 360.0f;
116			const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
117			uiLevel = intLimit * phase;
118			}
119	iliev	2227
120			void setFrequency(float Frequency, unsigned int SampleRate) {
121	schoenebeck	3118	this->Frequency = Frequency;
122			const float freq = Frequency * this->ScriptFrequencyFactor;
123	iliev	2227	const unsigned int intLimit = (unsigned int) -1; // all 0xFFFF...
124	schoenebeck	3118	float r = freq / (float) SampleRate; // frequency alteration quotient
125	iliev	2227	c = (int) (intLimit * r);
126			}
127	iliev	2223
128	schoenebeck	3561	void setScriptDepthFactor(float factor, bool isFinal) {
129	schoenebeck	3118	this->ScriptDepthFactor = factor;
130	schoenebeck	3561	// set or reset this script depth parameter to be the sole
131			// source for the LFO depth
132			if (isFinal && !this->pFinalDepth)
133			this->pFinalDepth = &this->ScriptDepthFactor;
134			else if (!isFinal && this->pFinalDepth == &this->ScriptDepthFactor)
135			this->pFinalDepth = NULL;
136			// recalculate upon new depth
137	schoenebeck	3118	updateByMIDICtrlValue(this->ExtControlValue);
138			}
139
140			void setScriptFrequencyFactor(float factor, unsigned int SampleRate) {
141			this->ScriptFrequencyFactor = factor;
142	schoenebeck	3561	// in case script frequency was set as "final" value before,
143			// reset it so that all sources are processed from now on
144			if (this->pFinalFrequency == &this->ScriptFrequencyFactor)
145			this->pFinalFrequency = NULL;
146			// recalculate upon new frequency
147	schoenebeck	3118	setFrequency(this->Frequency, SampleRate);
148			}
149
150	schoenebeck	3561	void setScriptFrequencyFinal(float hz, unsigned int SampleRate) {
151			this->ScriptFrequencyFactor = hz;
152			// assign script's given frequency as sole source for the LFO
153			// frequency, thus ignore all other sources
154			if (!this->pFinalFrequency)
155			this->pFinalFrequency = &this->ScriptFrequencyFactor;
156			// recalculate upon new frequency
157			setFrequency(this->Frequency, SampleRate);
158			}
159
160	iliev	2223	protected:
161			unsigned int uiLevel;
162			int c;
163			float offset; ///< only needed for signed range
164			float normalizer;
165			};
166
167
168	schoenebeck	3612	template<LFO::range_type_t RANGE>
169	iliev	2223	class SawUpLFO : public SawLFO<RANGE, true> {
170			public:
171			SawUpLFO(float Max) : SawLFO<RANGE, true>::SawLFO(Max) { }
172			};
173
174	schoenebeck	3612	template<LFO::range_type_t RANGE>
175	iliev	2223	class SawDownLFO : public SawLFO<RANGE, false> {
176			public:
177			SawDownLFO(float Max) : SawLFO<RANGE, false>::SawLFO(Max) { }
178			};
179
180			} // namespace LinuxSampler
181
182			#endif // __LS_SAWLFO_H__