/[svn]/linuxsampler/trunk/src/engines/gig/EGDecay.cpp
ViewVC logotype

Contents of /linuxsampler/trunk/src/engines/gig/EGDecay.cpp

Parent Directory Parent Directory | Revision Log Revision Log


Revision 319 - (show annotations) (download)
Mon Dec 13 00:46:42 2004 UTC (13 years, 6 months ago) by schoenebeck
File size: 3493 byte(s)
* introduced 'synthesis mode' to reduce the amount of code and conditionals
  for the current synthesis case in the main synthesis loop
* support for MMX and SSE(1) in the core synthesis algorithms (CPU feature
  detection at runtime, only x86 so far)

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #include "EGDecay.h"
24
25 namespace LinuxSampler { namespace gig {
26
27 EGDecay::EGDecay(gig::Engine* pEngine, Event::destination_t ModulationDestination) {
28 this->ModulationDestination = ModulationDestination;
29 this->pEngine = pEngine;
30 }
31
32 /**
33 * Will be called by the voice for every audio fragment to let the EG
34 * queue it's modulation changes for the current audio fragment.
35 *
36 * @param Samples - total number of sample points to be rendered in this
37 * audio fragment cycle by the audio engine
38 * @returns true if there was something to process
39 */
40 bool EGDecay::Process(uint Samples) {
41 if (!DecayStepsLeft) return false;
42
43 int iSample = TriggerDelay;
44 int to_process = RTMath::Min(Samples - iSample, DecayStepsLeft);
45 int process_end = iSample + to_process;
46 DecayStepsLeft -= to_process;
47 while (iSample < to_process) {
48 pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;
49 Level += DecayCoeff;
50 }
51 TriggerDelay = 0;
52
53 return true;
54 }
55
56 /**
57 * Will be called by the voice when the key / voice was triggered.
58 *
59 * @param Depth - Initial level of the envelope
60 * @param DecayTime - Decay time of the envelope (0.000 - 10.000s)
61 * @param Delay - Number of sample points triggering should be delayed.
62 */
63 void EGDecay::Trigger(float Depth, double DecayTime, uint Delay) {
64 this->TriggerDelay = Delay;
65 this->Level = Depth;
66
67 // calculate decay parameters (lin. curve)
68 DecayStepsLeft = (long) (DecayTime * pEngine->pAudioOutputDevice->SampleRate());
69 DecayCoeff = (1.0 - Depth) / DecayStepsLeft;
70
71 dmsg(4,("Depth=%d, DecayTime=%f\n", Depth, DecayTime));
72 }
73
74 }} // namespace LinuxSampler::gig

  ViewVC Help
Powered by ViewVC