private void FindClosestShaderTemplate(CachedTag sourceRmt2)
{
// somehow build a list of rmt2 of the same type
List <CachedTag> candidateTemplates = new List <CachedTag>();
// defined method search order, ignore last method from ms30
List <int> methodOrder = new List <int> {
0, 2, 3, 1, 6, 4, 5, 7, 8, 9, 10
};
Dictionary <CachedTag, int> matchLevelDictionary = new Dictionary <CachedTag, int>();
Rmt2Descriptor sourceRmt2Desc;
if (!Rmt2Descriptor.TryParse(sourceRmt2.Name, out sourceRmt2Desc))
{
return;
}
while (candidateTemplates.Count != 0)
{
var template = candidateTemplates.Last();
Rmt2Descriptor destRmt2Desc;
if (!Rmt2Descriptor.TryParse(template.Name, out destRmt2Desc))
{
candidateTemplates.Remove(template);
matchLevelDictionary[template] = 0;
}
else
{
var matchLevel = 0;
for (int i = 0; i < methodOrder.Count; i++)
{
var methodIndex = methodOrder[i];
// we need to define a ordering on the method options, so that there is a single best rmt2
if (sourceRmt2Desc.Options[methodIndex] == destRmt2Desc.Options[methodIndex])
{
matchLevel++;
}
else
{
break;
}
}
matchLevelDictionary[template] = matchLevel;
}
}
CachedTag bestRmt2 = null;
var bestScore = -1;
}
/// <summary>
/// Find the closest template in the base cache to the input template.
/// </summary>
private CachedTag FindClosestTemplate(CachedTag sourceRmt2Tag, RenderMethodTemplate sourceRmt2)
{
Debug.Assert(IsInitialized);
Rmt2Descriptor sourceRmt2Desc;
if (!Rmt2Descriptor.TryParse(sourceRmt2Tag.Name, out sourceRmt2Desc))
{
throw new ArgumentException($"Invalid rmt2 name '{sourceRmt2Tag.Name}'", nameof(sourceRmt2Tag));
}
var relevantRmt2s = new List <Rmt2Pairing>();
foreach (var rmt2Tag in BaseCache.TagCache.NonNull().Where(tag => tag.IsInGroup("rmt2")))
{
Rmt2Descriptor destRmt2Desc;
if (!Rmt2Descriptor.TryParse(rmt2Tag.Name, out destRmt2Desc))
{
continue;
}
// ignore ms30 templates if desired
if (!UseMs30 && destRmt2Desc.IsMs30)
{
continue;
}
// ignore templates that are not of the same type
if (destRmt2Desc.Type != sourceRmt2Desc.Type)
{
continue;
}
// match the options from the rmt2 tag names
int commonOptions = 0;
for (int i = 0; i < sourceRmt2Desc.Options.Length; i++)
{
if (sourceRmt2Desc.Options[i] == destRmt2Desc.Options[i])
{
commonOptions++;
}
}
// if we found an exact match, return it
if (commonOptions == sourceRmt2Desc.Options.Length)
{
return(rmt2Tag);
}
// add it to the list to be considered
relevantRmt2s.Add(new Rmt2Pairing()
{
CommonOptions = commonOptions,
DestTag = rmt2Tag,
SourceTag = sourceRmt2Tag
});
}
// if we've reached here, we haven't found an extract match.
// now we need to consider other factors such as which options they have, which parameters are missing etc..
// whatever can be used to narrow it down.
foreach (var pairing in relevantRmt2s)
{
var rmt2 = GetTemplate(pairing.DestTag);
pairing.RealParams = MatchParameterBlocks(sourceRmt2.RealParameterNames, rmt2.RealParameterNames);
pairing.IntParams = MatchParameterBlocks(sourceRmt2.IntegerParameterNames, rmt2.IntegerParameterNames);
pairing.BoolParams = MatchParameterBlocks(sourceRmt2.BooleanParameterNames, rmt2.BooleanParameterNames);
pairing.TextureParams = MatchParameterBlocks(sourceRmt2.TextureParameterNames, rmt2.TextureParameterNames);
}
// finally order by some criteria
var ordered = relevantRmt2s
.OrderBy(x => x.CommonOptions);
//.ThenByDescending(x => x.MissingFromDest);
// return the best rmt2 or the default if one could not be found (only when a template type is not in the base cache)
var bestRmt2 = ordered.LastOrDefault()?.DestTag;
if (bestRmt2 == null)
{
return(BaseCache.GetTag(DefaultTemplate));
}
return(bestRmt2);
}