2 * OpenAL cross platform audio library
3 * Copyright (C) 2011 by Chris Robinson.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 * Or go to http://www.gnu.org/copyleft/lgpl.html
27 #include "alAuxEffectSlot.h"
32 typedef struct ALdedicatedState
{
33 // Must be first in all effects!
36 ALfloat gains
[MaxChannels
];
40 static ALvoid
DedicatedDestroy(ALeffectState
*effect
)
42 ALdedicatedState
*state
= (ALdedicatedState
*)effect
;
46 static ALboolean
DedicatedDeviceUpdate(ALeffectState
*effect
, ALCdevice
*Device
)
53 static ALvoid
DedicatedUpdate(ALeffectState
*effect
, ALCdevice
*device
, const ALeffectslot
*Slot
)
55 ALdedicatedState
*state
= (ALdedicatedState
*)effect
;
59 Gain
= Slot
->Gain
* Slot
->effect
.Dedicated
.Gain
;
60 for(s
= 0;s
< MaxChannels
;s
++)
61 state
->gains
[s
] = 0.0f
;
63 if(Slot
->effect
.type
== AL_EFFECT_DEDICATED_DIALOGUE
)
64 ComputeAngleGains(device
, atan2f(0.0f
, 1.0f
), 0.0f
, Gain
, state
->gains
);
65 else if(Slot
->effect
.type
== AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT
)
66 state
->gains
[LFE
] = Gain
;
69 static ALvoid
DedicatedProcess(ALeffectState
*effect
, ALuint SamplesToDo
, const ALfloat
*SamplesIn
, ALfloat (*SamplesOut
)[MaxChannels
])
71 ALdedicatedState
*state
= (ALdedicatedState
*)effect
;
72 const ALfloat
*gains
= state
->gains
;
75 for(i
= 0;i
< SamplesToDo
;i
++)
79 sample
= SamplesIn
[i
];
80 for(s
= 0;s
< MaxChannels
;s
++)
81 SamplesOut
[i
][s
] = sample
* gains
[s
];
85 ALeffectState
*DedicatedCreate(void)
87 ALdedicatedState
*state
;
90 state
= malloc(sizeof(*state
));
94 state
->state
.Destroy
= DedicatedDestroy
;
95 state
->state
.DeviceUpdate
= DedicatedDeviceUpdate
;
96 state
->state
.Update
= DedicatedUpdate
;
97 state
->state
.Process
= DedicatedProcess
;
99 for(s
= 0;s
< MaxChannels
;s
++)
100 state
->gains
[s
] = 0.0f
;
102 return &state
->state
;