2010-05-06 00:08:41 +00:00
|
|
|
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
|
|
|
|
|
// Copyright (C) 2010 Winch Gate Property Limited
|
|
|
|
|
//
|
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
|
|
|
// it under the terms of the GNU Affero General Public License as
|
|
|
|
|
// published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
|
|
|
|
|
//
|
|
|
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
|
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
2010-05-10 20:28:57 +00:00
|
|
|
#include "nel/sound/driver/source.h"
|
2010-05-06 00:08:41 +00:00
|
|
|
#include "nel/misc/common.h"
|
|
|
|
|
|
|
|
|
|
using namespace NLMISC;
|
|
|
|
|
|
|
|
|
|
namespace NLSOUND
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
// common method used only with OptionManualRolloff. return the volume in 1/100th DB ( = mB) modified
|
|
|
|
|
sint32 ISource::computeManualRollOff(sint32 volumeMB, sint32 mbMin, sint32 mbMax, double alpha, float sqrdist, float distMin, float distMax)
|
|
|
|
|
{
|
|
|
|
|
if (sqrdist < distMin * distMin)
|
|
|
|
|
{
|
|
|
|
|
// no attenuation
|
|
|
|
|
return volumeMB;
|
|
|
|
|
}
|
|
|
|
|
else if (sqrdist > distMax * distMax)
|
|
|
|
|
{
|
|
|
|
|
// full attenuation
|
|
|
|
|
return mbMin;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
double dist = (double) sqrt(sqrdist);
|
|
|
|
|
|
|
|
|
|
// linearly descending volume on a dB scale
|
|
|
|
|
double db1 = mbMin * (dist - distMin) / (distMax - distMin);
|
|
|
|
|
|
|
|
|
|
if (alpha == 0.0) {
|
|
|
|
|
volumeMB += (sint32) db1;
|
|
|
|
|
|
|
|
|
|
} else if (alpha > 0.0) {
|
|
|
|
|
double amp2 = 0.0001 + 0.9999 * (distMax - dist) / (distMax - distMin); // linear amp between 0.00001 and 1.0
|
|
|
|
|
double db2 = 2000.0 * log10(amp2); // convert to 1/100th decibels
|
|
|
|
|
volumeMB += (sint32) ((1.0 - alpha) * db1 + alpha * db2);
|
|
|
|
|
|
|
|
|
|
} else if (alpha < 0.0) {
|
|
|
|
|
double amp3 = distMin / dist; // linear amplitude is 1/distance
|
|
|
|
|
double db3 = 2000.0 * log10(amp3); // convert to 1/100th decibels
|
|
|
|
|
volumeMB += (sint32) ((1.0 + alpha) * db1 - alpha * db3);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
clamp(volumeMB, mbMin, mbMax);
|
|
|
|
|
return volumeMB;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// common method used only with OptionManualRolloff. return the rolloff in amplitude ratio (gain)
|
|
|
|
|
float ISource::computeManualRolloff(double alpha, float sqrdist, float distMin, float distMax)
|
|
|
|
|
{
|
|
|
|
|
static const sint32 mbMin = -10000;
|
|
|
|
|
static const sint32 mbMax = 0;
|
|
|
|
|
sint32 rolloffMb = ISource::computeManualRollOff(mbMax, mbMin, mbMax, alpha, sqrdist, distMin, distMax);
|
|
|
|
|
float rolloffGain = (float)pow(10.0, (double)rolloffMb / 2000.0);
|
|
|
|
|
clamp(rolloffGain, 0.0f, 1.0f);
|
|
|
|
|
return rolloffGain;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // NLSOUND
|
|
|
|
|
|
|
|
|
|
/* end of file */
|
