private void UpdateCounter(GraphicsResourceLink resourceLink, int deltaCount)
{
if ((resourceLink.ReferenceCount + deltaCount) < 0)
{
throw new InvalidOperationException("Invalid decrement on reference count (must be >=0 after decrement). Current reference count: [{0}] Decrement: [{1}]".ToFormat(resourceLink.ReferenceCount, deltaCount));
}
resourceLink.ReferenceCount += deltaCount;
resourceLink.AccessTotalCount++;
resourceLink.AccessCountSinceLastRecycle++;
resourceLink.LastAccessTime = DateTime.Now;
}
private TResource GetTemporaryResource <TResource, TKey>(Dictionary <TKey, List <GraphicsResourceLink> > cache, TKey description, Func <TKey, PixelFormat, TResource> creator, Func <TResource, TKey> getDefinition, PixelFormat viewFormat)
where TResource : GraphicsResource
where TKey : struct
{
// For a specific description, get allocated textures
List <GraphicsResourceLink> resourceLinks;
if (!cache.TryGetValue(description, out resourceLinks))
{
resourceLinks = new List <GraphicsResourceLink>();
cache.Add(description, resourceLinks);
}
// Find a texture available
foreach (var resourceLink in resourceLinks)
{
if (resourceLink.ReferenceCount == 0)
{
UpdateCounter(resourceLink, 1);
return((TResource)resourceLink.Resource);
}
}
// If no texture available, then creates a new one
var newResource = creator(description, viewFormat);
newResource.Name = string.Format("{0}{1}-{2}", Name == null ? string.Empty : string.Format("{0}-", Name), newResource.Name == null ? newResource.GetType().Name : Name, resourceLinks.Count);
// Description may be altered when creating a resource (based on HW limitations...etc.) so we get the actual description
var realDescription = getDefinition(newResource);
// For a specific description, get allocated textures
if (!cache.TryGetValue(realDescription, out resourceLinks))
{
resourceLinks = new List <GraphicsResourceLink>();
cache.Add(description, resourceLinks);
}
// Add the texture to the allocated textures
// Start RefCount == 1, because we don't want this texture to be available if a post FxProcessor is calling
// several times this GetTemporaryTexture method.
var newResourceLink = new GraphicsResourceLink(newResource)
{
ReferenceCount = 1
};
resourceLinks.Add(newResourceLink);
return(newResource);
}
/// <summary>
/// The default recycle policy is always going to remove all allocated textures.
/// </summary>
/// <param name="resourceLink">The resource link.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
private static bool DefaultRecyclePolicy(GraphicsResourceLink resourceLink)
{
return(true);
}
