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("}");
}
}
