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Source pooling

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This commit is contained in:
Matthew Bowra-Dean
2010-01-20 19:45:00 +13:00
parent 3842addff4
commit 3fc8c8951c
2 changed files with 78 additions and 21 deletions
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59
OpenRa.Game/Sound.cs
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@@ -4,6 +4,7 @@ using OpenRa.FileFormats;
using OpenRa.Traits;
using OpenRa.Support;
using System.Runtime.InteropServices;
using System.Collections.Generic;
namespace OpenRa
{
@@ -128,6 +129,8 @@ namespace OpenRa
class OpenAlSoundEngine : ISoundEngine
{
float volume = 1f;
Dictionary<int, bool> sourcePool = new Dictionary<int, bool>();
const int POOL_SIZE = 100;
public OpenAlSoundEngine()
{
@@ -137,6 +140,46 @@ namespace OpenRa
throw new InvalidOperationException("Can't create OpenAL device");
var ctx = OpenAlInterop.alcCreateContext(dev, IntPtr.Zero);
OpenAlInterop.alcMakeContextCurrent(ctx);
int[] sources = new int[POOL_SIZE];
IntPtr pTemp = Marshal.AllocHGlobal(sizeof(int) * POOL_SIZE);
OpenAlInterop.alGenSources(POOL_SIZE, pTemp);
Marshal.Copy(pTemp, sources, 0, POOL_SIZE);
Marshal.FreeHGlobal(pTemp);
foreach (int source in sources)
sourcePool.Add(source, false);
}
int GetSourceFromPool()
{
foreach (var kvp in sourcePool)
{
if (!kvp.Value)
{
sourcePool[kvp.Key] = true;
return kvp.Key;
}
}
List<int> freeSources = new List<int>();
foreach (int key in sourcePool.Keys)
{
int state;
OpenAlInterop.alGetSourcei(key, OpenAlInterop.AL_SOURCE_STATE, out state);
if (state != OpenAlInterop.AL_PLAYING)
freeSources.Add(key);
}
if (freeSources.Count == 0)
return -1;
foreach (int i in freeSources)
sourcePool[i] = false;
sourcePool[freeSources[0]] = true;
return freeSources[0];
}
public ISoundSource AddSoundSourceFromMemory(byte[] data, int channels, int sampleBits, int sampleRate)
@@ -146,7 +189,8 @@ namespace OpenRa
public ISound Play2D(ISoundSource sound, bool loop)
{
return new OpenAlSound((sound as OpenAlSoundSource).buffer, loop);
int source = GetSourceFromPool();
return new OpenAlSound(source, (sound as OpenAlSoundSource).buffer, loop);
}
public float Volume
@@ -177,12 +221,13 @@ namespace OpenRa
class OpenAlSound : ISound
{
public readonly int source;
public readonly int source = -1;
float volume = 1f;
public OpenAlSound(int buffer, bool looping)
public OpenAlSound(int source, int buffer, bool looping)
{
OpenAlInterop.alGenSources(1, out source);
if (source == -1) return;
this.source = source;
OpenAlInterop.alSourcef(source, OpenAlInterop.AL_PITCH, 1f);
OpenAlInterop.alSourcef(source, OpenAlInterop.AL_GAIN, 1f);
OpenAlInterop.alSource3f(source, OpenAlInterop.AL_POSITION, 0f, 0f, 0f);
@@ -195,7 +240,11 @@ namespace OpenRa
public float Volume
{
get { return volume; }
set { OpenAlInterop.alSourcef(source, OpenAlInterop.AL_GAIN, volume = value); }
set
{
if (source != -1)
OpenAlInterop.alSourcef(source, OpenAlInterop.AL_GAIN, volume = value);
}
}
}
}