MemoryStream ExtractMetadataAndStream(string path)
{
if (ShaderFileCache.TryLoad(path, out string text))
{
DependencyPaths.Add(path);
if (MetadataParsing.Parse(path, text, Stages, MacroGroups, IncludeParsingErrors))
{
//We write ascii into the bytes regardless of the source text so that fxc is kept happy.
var bytes = Encoding.ASCII.GetBytes(text);
return(new MemoryStream(bytes));
}
}
return(null);
}
private static void CollectCompilationTargets(string source, string workingPath,
ShaderFileCache shaderFileCache, ShaderCompilationCache loadedCache, ShaderCompilationCache cache,
List <ShaderCompilationResult> errors, List <ShaderCompilationTarget> compilationTargets)
{
if (!shaderFileCache.TryLoad(source, out string shaderCode))
{
lock (errors)
{
errors.Add(new ShaderCompilationResult("Shader", "", "", source, 0, 0, 0, 0, "Could not find file " + source));
}
return;
}
//Only compile this shader if the shader has been modified since the previous compile.
var currentTimeStamp = File.GetLastWriteTime(source).Ticks;
if (loadedCache.ShaderFlags == cache.ShaderFlags && loadedCache.TimeStamps.TryGetValue(source, out long previousTimeStamp)) //If this file was contained before, we MIGHT be able to skip its compilation.
{
if (currentTimeStamp <= previousTimeStamp) //If the file hasn't been updated, we MIGHT be able to skip.
{
//Check the timestamps associated with the dependencies of this file.
//If any are newer than the previous snapshot, skip.
bool allowSkip = true;
if (loadedCache.Dependencies.TryGetValue(source, out HashSet <string> loadedDependencyPaths))
{
foreach (var dependency in loadedDependencyPaths)
{
//The loadedCache is guaranteed to contain a time stamp for any dependency referenced,
//because the only time any dependency is added to the list the dependency is ALSO put into the timestamps list.
var previousDependencyTimeStamp = loadedCache.TimeStamps[dependency];
var currentDependencyTimeStamp = File.GetLastWriteTime(dependency).Ticks;
if (currentDependencyTimeStamp > previousDependencyTimeStamp)
{
//One of the dependencies has been updated. This shader must be compiled.
allowSkip = false;
break;
}
}
}
else
{
//One of the dependencies could not be found in the old cache. Implies a new dependency was added; must compile.
allowSkip = false;
}
if (allowSkip)
{
Console.WriteLine($"Shader up to date: {Path.GetFileName(source)}");
cache.CopyFrom(source, loadedCache);
return;
}
}
}
var localWorkingPath = Path.GetDirectoryName(source);
var include = new IncludeHandler(shaderFileCache, workingPath, localWorkingPath);
var stages = new List <ShaderStage>();
var macroGroups = new List <MacroGroup>();
var metadataParsingErrors = new List <MetadataParsingError>();
MetadataParsing.Parse(source, shaderCode, stages, macroGroups, metadataParsingErrors);
//Prepass to collect include metadata. Seems hacky, oh well.
try
{
ShaderBytecode.Preprocess(shaderCode, null, include);
}
catch (CompilationException e)
{
if (ParseCompilerResult(e.Message, out string filePath, out int lineBegin, out int columnBegin, out int lineEnd, out int columnEnd, out string description))
{
var errorChecker = new Regex("error X(?<errorCode>[0-9]{4}): ");
var errorCode = errorChecker.Match(e.Message).Groups["errorCode"].Value;
lock (errors)
{
errors.Add(new ShaderCompilationResult("Shader", errorCode, "", source, lineBegin, columnBegin, lineEnd, columnEnd, description));
}
}