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263 行
9.4 KiB

using System;
using ICSharpCode.NRefactory;
using ICSharpCode.NRefactory.Visitors;
using ICSharpCode.NRefactory.Ast;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEngine;
using UnityEngine.Experimental.Rendering;
namespace UnityEditor.Experimental.Rendering
{
public class CSharpToHLSL
{
public static bool GenerateHLSL(System.Type type, GenerateHLSL attribute, out string shaderSource)
{
List<string> errors;
return GenerateHLSL(type, attribute, out shaderSource, out errors);
}
public static bool GenerateHLSL(System.Type type, GenerateHLSL attribute, out string shaderSource, out List<string> errors)
{
ShaderTypeGenerator gen = new ShaderTypeGenerator(type, attribute);
bool success = gen.Generate();
if (success)
{
shaderSource = gen.Emit();
}
else
{
shaderSource = null;
}
errors = gen.errors;
return success;
}
public static void GenerateAll()
{
s_TypeName = new Dictionary<string, ShaderTypeGenerator>();
// Iterate over assemblyList, discover all applicable types with fully qualified names
var assemblyList = AppDomain.CurrentDomain.GetAssemblies().ToList();
foreach (var assembly in assemblyList)
{
var types = assembly.GetExportedTypes();
foreach (var type in types)
{
var attributes = type.GetCustomAttributes(true);
foreach (var attr in attributes)
{
if (attr is GenerateHLSL)
{
ShaderTypeGenerator gen;
if (s_TypeName.TryGetValue(type.FullName, out gen))
{
Debug.LogError( "Duplicate typename with the GenerateHLSL attribute detected: " + type.FullName +
" declared in both " + gen.type.Assembly.FullName + " and " + type.Assembly.FullName + ". Skipping the second instance.");
}
s_TypeName[type.FullName] = new ShaderTypeGenerator(type, attr as GenerateHLSL);
}
}
}
}
// Now that we have extracted all the typenames that we care about, parse all .cs files in all asset
// paths and figure out in which files those types are actually declared.
s_SourceGenerators = new Dictionary<string, List<ShaderTypeGenerator>>();
var assetPaths = AssetDatabase.GetAllAssetPaths().Where(s => s.EndsWith(".cs")).ToList();
foreach (var assetPath in assetPaths)
{
LoadTypes(assetPath);
}
// Finally, write out the generated code
foreach (var it in s_SourceGenerators)
{
string fileName = it.Key + ".hlsl";
bool skipFile = false;
foreach (var gen in it.Value)
{
if (!gen.Generate())
{
// Error reporting will be done by the generator. Skip this file.
gen.PrintErrors();
skipFile = true;
break;
}
}
if (skipFile)
continue;
using (var writer = File.CreateText(fileName))
{
var guard = Path.GetFileName(fileName).Replace(".", "_").ToUpper();
if (!char.IsLetter(guard[0]))
guard = "_" + guard;
writer.Write("//\n");
writer.Write("// This file was automatically generated. Please don't edit by hand.\n");
writer.Write("//\n\n");
writer.Write("#ifndef " + guard + "\n");
writer.Write("#define " + guard + "\n");
foreach (var gen in it.Value)
{
if (gen.hasStatics)
{
writer.Write(gen.EmitDefines() + "\n");
}
}
foreach (var gen in it.Value)
{
if (gen.hasFields)
{
writer.Write(gen.EmitTypeDecl() + "\n");
}
}
foreach (var gen in it.Value)
{
if (gen.hasFields && gen.needAccessors)
{
writer.Write(gen.EmitAccessors() + "\n");
}
}
foreach (var gen in it.Value)
{
if (gen.hasStatics && gen.hasFields && gen.needParamDebug)
{
writer.Write(gen.EmitFunctions() + "\n");
}
}
writer.Write("\n#endif\n");
}
}
}
static Dictionary<string, ShaderTypeGenerator> s_TypeName;
static void LoadTypes(string fileName)
{
using (var parser = ParserFactory.CreateParser(fileName))
{
// @TODO any standard preprocessor symbols we need?
/*var uniqueSymbols = new HashSet<string>(definedSymbols.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries));
foreach (var symbol in uniqueSymbols)
{
parser.Lexer.ConditionalCompilationSymbols.Add(symbol, string.Empty);
}*/
parser.Lexer.EvaluateConditionalCompilation = true;
parser.Parse();
try
{
var visitor = new NamespaceVisitor();
var data = new VisitorData { typeName = s_TypeName };
parser.CompilationUnit.AcceptVisitor(visitor, data);
if (data.generators.Count > 0)
s_SourceGenerators[fileName] = data.generators;
}
catch
{
// does NRefactory throw anything we can handle here?
throw;
}
}
}
static Dictionary<string, List<ShaderTypeGenerator>> s_SourceGenerators;
class VisitorData
{
public VisitorData()
{
currentNamespaces = new Stack<string>();
currentClasses = new Stack<string>();
generators = new List<ShaderTypeGenerator>();
}
public string GetTypePrefix()
{
var fullNamespace = string.Empty;
var separator = "";
fullNamespace = currentClasses.Aggregate(fullNamespace, (current, ns) => ns + "+" + current);
foreach (var ns in currentNamespaces)
{
if (fullNamespace == string.Empty)
{
separator = ".";
fullNamespace = ns;
}
else
fullNamespace = ns + "." + fullNamespace;
}
var name = "";
if (fullNamespace != string.Empty)
{
name = fullNamespace + separator + name;
}
return name;
}
public readonly Stack<string> currentNamespaces;
public readonly Stack<string> currentClasses;
public readonly List<ShaderTypeGenerator> generators;
public Dictionary<string, ShaderTypeGenerator> typeName;
}
class NamespaceVisitor : AbstractAstVisitor
{
public override object VisitNamespaceDeclaration(ICSharpCode.NRefactory.Ast.NamespaceDeclaration namespaceDeclaration, object data)
{
var visitorData = (VisitorData)data;
visitorData.currentNamespaces.Push(namespaceDeclaration.Name);
namespaceDeclaration.AcceptChildren(this, visitorData);
visitorData.currentNamespaces.Pop();
return null;
}
public override object VisitTypeDeclaration(TypeDeclaration typeDeclaration, object data)
{
// Structured types only
if (typeDeclaration.Type == ClassType.Class || typeDeclaration.Type == ClassType.Struct || typeDeclaration.Type == ClassType.Enum)
{
var visitorData = (VisitorData)data;
var name = visitorData.GetTypePrefix() + typeDeclaration.Name;
ShaderTypeGenerator gen;
if (visitorData.typeName.TryGetValue(name, out gen))
{
visitorData.generators.Add(gen);
}
visitorData.currentClasses.Push(typeDeclaration.Name);
typeDeclaration.AcceptChildren(this, visitorData);
visitorData.currentClasses.Pop();
}
return null;
}
}
}
}