private void GenerateCommmands(CppCompilation compilation, string outputPath, string flavour)
{
Debug.WriteLine("Generating Commands...");
bool isBrowser = false;
string dllName;
if (flavour == "Browser")
{
isBrowser = true;
dllName = "libWebGPU";
}
else if (flavour == "Dawn")
{
dllName = "dawn_proc.dll";
}
else
{
throw new Exception($"Flavour ${flavour} not supported");
}
using (StreamWriter file = File.CreateText(Path.Combine(outputPath, "Commands.cs")))
{
file.WriteLine("using System;");
file.WriteLine("using System.Diagnostics;");
file.WriteLine("using System.Runtime.InteropServices;\n");
file.WriteLine("namespace WaveEngine.Bindings.WebGPU");
file.WriteLine("{");
file.WriteLine("\tpublic static unsafe partial class WebGPUNative");
file.WriteLine("\t{");
file.WriteLine($"\t\tprivate const string dllName = \"{dllName}\";");
foreach (var command in compilation.Functions)
{
string convertedType = Helpers.ConvertToCSharpType(command.ReturnType, false);
if (!isBrowser || !emscriptenUnsupportedCommands.Contains(command.Name))
{
file.WriteLine("\n\t\t[DllImport(dllName)]");
file.WriteLine($"\t\tpublic static extern {convertedType} {command.Name}({Helpers.GetParametersSignature(command)});");
}
}
file.WriteLine("\t}");
file.WriteLine("}");
}
}
private void GenerateDelegates(CppCompilation compilation, string outputPath)
{
Debug.WriteLine("Generating Delegates...");
var delegates = compilation.Typedefs
.Where(t => t.TypeKind == CppTypeKind.Typedef &&
t.ElementType is CppPointerType &&
((CppPointerType)t.ElementType).ElementType.TypeKind == CppTypeKind.Function)
.ToList();
using (StreamWriter file = File.CreateText(Path.Combine(outputPath, "Delegates.cs")))
{
file.WriteLine("using System;\n");
file.WriteLine("namespace WaveEngine.Bindings.WebGPU");
file.WriteLine("{");
foreach (var funcPointer in delegates)
{
CppFunctionType pointerType = ((CppPointerType)funcPointer.ElementType).ElementType as CppFunctionType;
var returnType = Helpers.ConvertToCSharpType(pointerType.ReturnType);
file.Write($"\tpublic unsafe delegate {returnType} {funcPointer.Name}(");
if (pointerType.Parameters.Count > 0)
{
file.Write("\n");
for (int i = 0; i < pointerType.Parameters.Count; i++)
{
if (i > 0)
{
file.Write(",\n");
}
var parameter = pointerType.Parameters[i];
var convertedType = Helpers.ConvertToCSharpType(parameter.Type);
file.Write($"\t\t {convertedType} {parameter.Name}");
}
}
file.Write(");\n\n");
}
file.WriteLine("}");
}
}
private void GenerateStructs(CppCompilation compilation, string outputPath)
{
Debug.WriteLine("Generating Structs...");
using (StreamWriter file = File.CreateText(Path.Combine(outputPath, "Structs.cs")))
{
file.WriteLine("using System;");
file.WriteLine("using System.Runtime.InteropServices;\n");
file.WriteLine("namespace WaveEngine.Bindings.WebGPU");
file.WriteLine("{");
var structs = compilation.Classes.Where(c => c.ClassKind == CppClassKind.Struct && c.IsDefinition == true);
foreach (var structure in structs)
{
file.WriteLine("\t[StructLayout(LayoutKind.Sequential)]");
file.WriteLine($"\tpublic unsafe struct {structure.Name}");
file.WriteLine("\t{");
foreach (var member in structure.Fields)
{
string type = Helpers.ConvertToCSharpType(member.Type);
if (type == "bool")
{
// This is to marshal bool as one byte
// https://stackoverflow.com/questions/28514373/what-is-the-size-of-a-boolean-in-c-does-it-really-take-4-bytes/28515361
// https://stackoverflow.com/questions/11416433/marshalling-non-blittable-structs-from-c-sharp-to-c
// https://stackoverflow.com/questions/32110152/c-sharp-marshalling-bool
file.WriteLine($"\t\t[MarshalAs(UnmanagedType.I1)]");
}
file.WriteLine($"\t\tpublic {type} {member.Name};");
}
file.WriteLine("\t}\n");
}
file.WriteLine("}\n");
}
}
private void GenerateCommmands(CppCompilation compilation, string outputPath)
{
Debug.WriteLine("Generating Commands...");
using (StreamWriter file = File.CreateText(Path.Combine(outputPath, "Commands.cs")))
{
file.WriteLine("using System;");
file.WriteLine("using System.Diagnostics;");
file.WriteLine("using System.Runtime.InteropServices;\n");
file.WriteLine("namespace WaveEngine.Bindings.WebGPU");
file.WriteLine("{");
file.WriteLine("\tpublic static unsafe partial class WebGPUNative");
file.WriteLine("\t{");
file.WriteLine("\t\tprivate static Func<IntPtr, string, IntPtr> s_getProcAddress;\n");
file.WriteLine("\t\tprivate static IntPtr p_device;\n");
file.WriteLine("\t\tprivate const CallingConvention CallConv = CallingConvention.Winapi;\n");
foreach (var command in compilation.Functions)
{
string convertedType = Helpers.ConvertToCSharpType(command.ReturnType, false);
file.WriteLine("\t\t[UnmanagedFunctionPointer(CallConv)]");
// Delegate
file.WriteLine($"\t\tprivate delegate {convertedType} {command.Name}Delegate({Helpers.GetParametersSignature(command)});");
// internal function
file.WriteLine($"\t\tprivate static {command.Name}Delegate {command.Name}_ptr;");
// public function
file.WriteLine($"\t\tpublic static {convertedType} {command.Name}({Helpers.GetParametersSignature(command)})");
file.WriteLine($"\t\t\t=> {command.Name}_ptr({Helpers.GetParametersSignature(command, false)});\n");
}
file.WriteLine($"\n\t\tpublic static void LoadFuncionPointers(IntPtr device, Func<IntPtr, string, IntPtr> getProcAddress)");
file.WriteLine("\t\t{");
file.WriteLine("\t\t\ts_getProcAddress = getProcAddress;\n");
file.WriteLine("\t\t\tp_device = device;\n");
foreach (var command in compilation.Functions)
{
file.WriteLine($"\t\t\tLoadFunction(\"{command.Name}\", out {command.Name}_ptr);");
}
file.WriteLine("\t\t}\n");
file.WriteLine("\t\tprivate static void LoadFunction<T>(string name, out T field)");
file.WriteLine("\t\t{");
file.WriteLine("\t\t\tIntPtr funcPtr = s_getProcAddress(p_device, name);");
file.WriteLine("\t\t\tif (funcPtr != IntPtr.Zero)");
file.WriteLine("\t\t\t{");
file.WriteLine("\t\t\t\tfield = Marshal.GetDelegateForFunctionPointer<T>(funcPtr);");
file.WriteLine("\t\t\t}");
file.WriteLine("\t\t\telse");
file.WriteLine("\t\t\t{");
file.WriteLine("\t\t\t\tDebug.WriteLine($\"WARING: Function { name} not found in WebGPU implementation.\");");
file.WriteLine("\t\t\t\tfield = default(T);");
file.WriteLine("\t\t\t}");
file.WriteLine("\t\t}");
file.WriteLine("\t}");
file.WriteLine("}");
}
}