/** * OpenAL cross platform audio library * Copyright (C) 1999-2010 by authors. * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Or go to http://www.gnu.org/copyleft/lgpl.html */ #include "config.h" #include #include #include #include #include #include "alMain.h" #include "AL/al.h" #include "AL/alc.h" #include "alu.h" extern inline void SetGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MaxChannels]); void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MaxChannels]) { ALfloat dir[3] = { -sinf(angle) * cosf(elevation), sinf(elevation), -cosf(angle) * cosf(elevation) }; ComputeDirectionalGains(device, dir, ingain, gains); } void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MaxChannels]) { ALfloat coeffs[MAX_AMBI_COEFFS]; ALuint i, j; /* Convert from OpenAL coords to Ambisonics. */ ALfloat x = -dir[2]; ALfloat y = -dir[0]; ALfloat z = dir[1]; coeffs[0] = 0.7071f; /* sqrt(1.0 / 2.0) */ coeffs[1] = x; /* X */ coeffs[2] = y; /* Y */ coeffs[3] = z; /* Z */ coeffs[4] = 0.5f * (3.0f*z*z - 1.0f); /* 0.5 * (3*Z*Z - 1) */ coeffs[5] = 2.0f * z * x; /* 2*Z*X */ coeffs[6] = 2.0f * y * z; /* 2*Y*Z */ coeffs[7] = x*x - y*y; /* X*X - Y*Y */ coeffs[8] = 2.0f * x * y; /* 2*X*Y */ coeffs[9] = 0.5f * z * (5.0f*z*z - 3.0f); /* 0.5 * Z * (5*Z*Z - 3) */ coeffs[10] = 0.7262f * x * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * X * (5*Z*Z - 1) */ coeffs[11] = 0.7262f * y * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * Y * (5*Z*Z - 1) */ coeffs[12] = 2.5981f * z * (x*x - y*y); /* sqrt(27.0 / 4.0) * Z * (X*X - Y*Y) */ coeffs[13] = 5.1962f * x * y * z; /* sqrt(27) * X * Y * Z */ coeffs[14] = x * (x*x - 3.0f*y*y); /* X * (X*X - 3*Y*Y) */ coeffs[15] = y * (3.0f*x*x - y*y); /* Y * (3*X*X - Y*Y) */ for(i = 0;i < MaxChannels;i++) gains[i] = 0.0f; for(i = 0;i < device->NumSpeakers;i++) { enum Channel chan = device->Speaker[i].ChanName; for(j = 0;j < MAX_AMBI_COEFFS;j++) gains[chan] += device->Speaker[i].Coeff[j]*coeffs[j]; gains[chan] = maxf(gains[chan], 0.0f) * ingain; } } ALvoid aluInitPanning(ALCdevice *device) { static const ChannelConfig MonoCfg[1] = { { FrontCenter, DEG2RAD(0.0f), DEG2RAD(0.0f), { 1.4142f } } }, StereoCfg[2] = { { FrontLeft, DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.7071f, -0.5f, 0.0f, 0.0f } }, { FrontLeft, DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.7071f, 0.5f, 0.0f, 0.0f } } }, QuadCfg[4] = { { FrontLeft, DEG2RAD( -45.0f), DEG2RAD(0.0f), { 0.353558f, 0.306181f, 0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.117183f } }, { FrontRight, DEG2RAD( 45.0f), DEG2RAD(0.0f), { 0.353543f, 0.306181f, -0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.117193f } }, { BackLeft, DEG2RAD(-135.0f), DEG2RAD(0.0f), { 0.353543f, -0.306192f, 0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.117193f } }, { BackRight, DEG2RAD( 135.0f), DEG2RAD(0.0f), { 0.353558f, -0.306192f, -0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.117183f } } }, X51Cfg[5] = { { FrontLeft, DEG2RAD( -30.0f), DEG2RAD(0.0f), { 0.208954f, 0.212846f, 0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, 0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, 0.047490f } }, { FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.208950f, 0.212842f, -0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017740f, -0.204011f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051022f, -0.047489f } }, { FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f } }, { BackLeft, DEG2RAD(-110.0f), DEG2RAD(0.0f), { 0.470934f, -0.369630f, 0.349383f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031379f, -0.058143f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007116f, -0.043968f } }, { BackRight, DEG2RAD( 110.0f), DEG2RAD(0.0f), { 0.470936f, -0.369626f, -0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, 0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, 0.043968f } } }, X51SideCfg[5] = { { FrontLeft, DEG2RAD(-30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f } }, { FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167058f, 0.200580f, -0.172701f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029846f, -0.186405f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068904f } }, { FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f } }, { SideLeft, DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, 0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, -0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, -0.032897f } }, { SideRight, DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.289157f, -0.081298f, -0.401295f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, 0.071419f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, 0.032897f } } }, X61Cfg[6] = { { FrontLeft, DEG2RAD(-30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f } }, { FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167058f, 0.200580f, -0.172701f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029846f, -0.186405f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068904f } }, { FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f } }, { BackCenter, DEG2RAD(180.0f), DEG2RAD(0.0f), { 0.353556f, -0.461940f, -0.000006f, 0.0f, 0.0f, 0.0f, 0.0f, 0.165723f, -0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.000005f } }, { SideLeft, DEG2RAD(-90.0f), DEG2RAD(0.0f), { 0.289151f, -0.081301f, 0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, -0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, -0.032897f } }, { SideRight, DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.289157f, -0.081298f, -0.401295f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, 0.071419f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, 0.032897f } } }, X71Cfg[7] = { { FrontLeft, DEG2RAD( -30.0f), DEG2RAD(0.0f), { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f } }, { FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f), { 0.167058f, 0.200580f, -0.172701f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029846f, -0.186405f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068904f } }, { FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f), { 0.109403f, 0.179490f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f } }, { BackLeft, DEG2RAD(-150.0f), DEG2RAD(0.0f), { 0.224752f, -0.295009f, 0.170325f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105349f, -0.182473f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.000000f, 0.065799f } }, { BackRight, DEG2RAD( 150.0f), DEG2RAD(0.0f), { 0.224739f, -0.295005f, -0.170331f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105342f, 0.182470f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.000000f, -0.065792f } }, { SideLeft, DEG2RAD( -90.0f), DEG2RAD(0.0f), { 0.224739f, 0.000002f, 0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, 0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.000000f, -0.065795f } }, { SideRight, DEG2RAD( 90.0f), DEG2RAD(0.0f), { 0.224754f, 0.000004f, -0.340647f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, -0.000004f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.000000f, 0.065796f } } }; const ChannelConfig *config; ALuint i; memset(device->Speaker, 0, sizeof(device->Speaker)); device->NumSpeakers = 0; switch(device->FmtChans) { case DevFmtMono: device->NumSpeakers = 1; config = MonoCfg; break; case DevFmtStereo: device->NumSpeakers = 2; config = StereoCfg; break; case DevFmtQuad: device->NumSpeakers = 4; config = QuadCfg; break; case DevFmtX51: device->NumSpeakers = 5; config = X51Cfg; break; case DevFmtX51Side: device->NumSpeakers = 5; config = X51SideCfg; break; case DevFmtX61: device->NumSpeakers = 6; config = X61Cfg; break; case DevFmtX71: device->NumSpeakers = 7; config = X71Cfg; break; } for(i = 0;i < device->NumSpeakers;i++) device->Speaker[i] = config[i]; }