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using System.Collections.Generic;
using UnityEngine.Rendering;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
public class DensityVolumeManager
{
static private DensityVolumeManager _instance = null;
public static DensityVolumeManager manager
{
get
{
if (_instance == null)
{
_instance = new DensityVolumeManager();
}
return _instance;
}
}
public VolumeTextureAtlas volumeAtlas = null;
private bool atlasNeedsRefresh = false;
//TODO: hardcoded size....:-(
public static int volumeTextureSize = 32;
private DensityVolumeManager()
{
volumes = new List<DensityVolume>();
volumeAtlas = new VolumeTextureAtlas(TextureFormat.Alpha8, volumeTextureSize);
volumeAtlas.OnAtlasUpdated += AtlasUpdated;
}
private List<DensityVolume> volumes = null;
public void RegisterVolume(DensityVolume volume)
{
volumes.Add(volume);
volume.OnTextureUpdated += TriggerVolumeAtlasRefresh;
if (volume.parameters.volumeMask != null)
{
volumeAtlas.AddTexture(volume.parameters.volumeMask);
}
}
public void DeRegisterVolume(DensityVolume volume)
{
if (volumes.Contains(volume))
{
volumes.Remove(volume);
}
volume.OnTextureUpdated -= TriggerVolumeAtlasRefresh;
if (volume.parameters.volumeMask != null)
{
volumeAtlas.RemoveTexture(volume.parameters.volumeMask);
}
//Upon removal we have to refresh the texture list.
TriggerVolumeAtlasRefresh();
}
public DensityVolume[] PrepareDensityVolumeData(CommandBuffer cmd)
{
//Update volumes
foreach (DensityVolume volume in volumes )
{
volume.PrepareParameters();
}
if (atlasNeedsRefresh)
{
atlasNeedsRefresh = false;
VolumeAtlasRefresh();
}
volumeAtlas.GenerateVolumeAtlas(cmd);
return volumes.ToArray();
}
private void VolumeAtlasRefresh()
{
volumeAtlas.ClearTextures();
foreach (DensityVolume volume in volumes )
{
if (volume.parameters.volumeMask != null)
{
volumeAtlas.AddTexture(volume.parameters.volumeMask);
}
}
}
private void TriggerVolumeAtlasRefresh()
{
atlasNeedsRefresh = true;
}
private void AtlasUpdated()
{
foreach(DensityVolume volume in volumes )
{
volume.parameters.textureIndex = volumeAtlas.GetTextureIndex(volume.parameters.volumeMask);
}
}
}
}