Mono/C#: Re-structure API solution and GodotTools post-build target

Previously we had a placeholder solution called 'Managed' to benefit from
tooling while editing the a part of the C# API.
Later the bindings generator would create the final 'GodotSharp' solution
including these C# files as well as the auto-generated C# API.
Now we replaced the 'Managed' solution with the final 'GodotSharp' solution
which is no longer auto-generated, and the bindings generator only takes
care of the auto-generated C# API.
This has the following benefits:
- It's less confusing as there will no longer be two versions of the same file
(the original and a generated copy of it). Now there's only one.
- We no longer need placeholder for auto-generated API classes, like Node or
Resource. We used them for benefiting from tooling. Now we can just use the
auto-generated API itself.
- Simplifies the build system and bindings generator. Removed lot of code
that is not needed anymore.

Also added a post-build target to the GodotTools project to copy the output to
the data dir. This makes it easy to iterate when doing changes to GodotTools,
as SCons doesn't have to be executed anymore just to copy these new files.

9 files changed, 91 insertions, 333 deletions

diff --git a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ApiSolutionGenerator.cs b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ApiSolutionGenerator.cs
deleted file mode 100644
index bfae2afc13..0000000000
--- a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ApiSolutionGenerator.cs
+++ /dev/null
@@ -1,52 +0,0 @@
-using System.Collections.Generic;
-using System.IO;
-
-namespace GodotTools.ProjectEditor
-{
-    public static class ApiSolutionGenerator
-    {
-        public static void GenerateApiSolution(string solutionDir,
-            string coreProjDir, IEnumerable<string> coreCompileItems,
-            string editorProjDir, IEnumerable<string> editorCompileItems)
-        {
-            var solution = new DotNetSolution(ApiAssemblyNames.SolutionName);
-
-            solution.DirectoryPath = solutionDir;
-
-            // GodotSharp project
-
-            const string coreApiAssemblyName = ApiAssemblyNames.Core;
-
-            string coreGuid = ProjectGenerator.GenCoreApiProject(coreProjDir, coreCompileItems);
-
-            var coreProjInfo = new DotNetSolution.ProjectInfo
-            {
-                Guid = coreGuid,
-                PathRelativeToSolution = Path.Combine(coreApiAssemblyName, $"{coreApiAssemblyName}.csproj")
-            };
-            coreProjInfo.Configs.Add("Debug");
-            coreProjInfo.Configs.Add("Release");
-
-            solution.AddNewProject(coreApiAssemblyName, coreProjInfo);
-
-            // GodotSharpEditor project
-
-            const string editorApiAssemblyName = ApiAssemblyNames.Editor;
-
-            string editorGuid = ProjectGenerator.GenEditorApiProject(editorProjDir,
-                $"../{coreApiAssemblyName}/{coreApiAssemblyName}.csproj", editorCompileItems);
-
-            var editorProjInfo = new DotNetSolution.ProjectInfo();
-            editorProjInfo.Guid = editorGuid;
-            editorProjInfo.PathRelativeToSolution = Path.Combine(editorApiAssemblyName, $"{editorApiAssemblyName}.csproj");
-            editorProjInfo.Configs.Add("Debug");
-            editorProjInfo.Configs.Add("Release");
-
-            solution.AddNewProject(editorApiAssemblyName, editorProjInfo);
-
-            // Save solution
-
-            solution.Save();
-        }
-    }
-}
diff --git a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
index ab3a5d1aea..ae727e8789 100644
--- a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
@@ -32,18 +32,11 @@
     <Reference Include="System" />
     <Reference Include="Microsoft.Build" />
     <Reference Include="DotNet.Glob, Version=2.1.1.0, Culture=neutral, PublicKeyToken=b68cc888b4f632d1, processorArchitecture=MSIL">
-      <!--
-      When building Godot with 'mono_glue=no' SCons will build this project alone instead of the
-      entire solution. $(SolutionDir) is not defined in that case, so we need to workaround that.
-      We make SCons restore the NuGet packages in the project directory instead in this case.
-      -->
-      <HintPath Condition=" '$(SolutionDir)' != '' And Exists('$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll') ">$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
-      <HintPath Condition=" '$(SolutionDir)' == '' Or !Exists('$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll') ">$(ProjectDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
+      <HintPath>packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ApiAssembliesInfo.cs" />
-    <Compile Include="ApiSolutionGenerator.cs" />
     <Compile Include="DotNetSolution.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="IdentifierUtils.cs" />
diff --git a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectGenerator.cs b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectGenerator.cs
index b40d985d51..22a0074580 100644
--- a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectGenerator.cs
+++ b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectGenerator.cs
@@ -10,68 +10,13 @@ namespace GodotTools.ProjectEditor
     {
         private const string CoreApiProjectName = "GodotSharp";
         private const string EditorApiProjectName = "GodotSharpEditor";
-        private const string CoreApiProjectGuid = "{AEBF0036-DA76-4341-B651-A3F2856AB2FA}";
-        private const string EditorApiProjectGuid = "{8FBEC238-D944-4074-8548-B3B524305905}";
-
-        public static string GenCoreApiProject(string dir, IEnumerable<string> compileItems)
-        {
-            string path = Path.Combine(dir, CoreApiProjectName + ".csproj");
-
-            ProjectPropertyGroupElement mainGroup;
-            var root = CreateLibraryProject(CoreApiProjectName, out mainGroup);
-
-            mainGroup.AddProperty("DocumentationFile", Path.Combine("$(OutputPath)", "$(AssemblyName).xml"));
-            mainGroup.SetProperty("RootNamespace", "Godot");
-            mainGroup.SetProperty("ProjectGuid", CoreApiProjectGuid);
-            mainGroup.SetProperty("BaseIntermediateOutputPath", "obj");
-
-            GenAssemblyInfoFile(root, dir, CoreApiProjectName,
-                new[] { "[assembly: InternalsVisibleTo(\"" + EditorApiProjectName + "\")]" },
-                new[] { "System.Runtime.CompilerServices" });
-
-            foreach (var item in compileItems)
-            {
-                root.AddItem("Compile", item.RelativeToPath(dir).Replace("/", "\\"));
-            }
-
-            root.Save(path);
-
-            return CoreApiProjectGuid;
-        }
-
-        public static string GenEditorApiProject(string dir, string coreApiProjPath, IEnumerable<string> compileItems)
-        {
-            string path = Path.Combine(dir, EditorApiProjectName + ".csproj");
-
-            ProjectPropertyGroupElement mainGroup;
-            var root = CreateLibraryProject(EditorApiProjectName, out mainGroup);
-
-            mainGroup.AddProperty("DocumentationFile", Path.Combine("$(OutputPath)", "$(AssemblyName).xml"));
-            mainGroup.SetProperty("RootNamespace", "Godot");
-            mainGroup.SetProperty("ProjectGuid", EditorApiProjectGuid);
-            mainGroup.SetProperty("BaseIntermediateOutputPath", "obj");
-
-            GenAssemblyInfoFile(root, dir, EditorApiProjectName);
-
-            foreach (var item in compileItems)
-            {
-                root.AddItem("Compile", item.RelativeToPath(dir).Replace("/", "\\"));
-            }
-
-            var coreApiRef = root.AddItem("ProjectReference", coreApiProjPath.Replace("/", "\\"));
-            coreApiRef.AddMetadata("Private", "False");
-
-            root.Save(path);
-
-            return EditorApiProjectGuid;
-        }
 
         public static string GenGameProject(string dir, string name, IEnumerable<string> compileItems)
         {
             string path = Path.Combine(dir, name + ".csproj");
 
             ProjectPropertyGroupElement mainGroup;
-            var root = CreateLibraryProject(name, out mainGroup);
+            var root = CreateLibraryProject(name, "Tools", out mainGroup);
 
             mainGroup.SetProperty("OutputPath", Path.Combine(".mono", "temp", "bin", "$(Configuration)"));
             mainGroup.SetProperty("BaseIntermediateOutputPath", Path.Combine(".mono", "temp", "obj"));
@@ -110,7 +55,7 @@ namespace GodotTools.ProjectEditor
             return root.GetGuid().ToString().ToUpper();
         }
 
-        public static void GenAssemblyInfoFile(ProjectRootElement root, string dir, string name, string[] assemblyLines = null, string[] usingDirectives = null)
+        private static void GenAssemblyInfoFile(ProjectRootElement root, string dir, string name, string[] assemblyLines = null, string[] usingDirectives = null)
         {
             string propertiesDir = Path.Combine(dir, "Properties");
             if (!Directory.Exists(propertiesDir))
@@ -138,7 +83,7 @@ namespace GodotTools.ProjectEditor
             root.AddItem("Compile", assemblyInfoFile.RelativeToPath(dir).Replace("/", "\\"));
         }
 
-        public static ProjectRootElement CreateLibraryProject(string name, out ProjectPropertyGroupElement mainGroup)
+        public static ProjectRootElement CreateLibraryProject(string name, string defaultConfig, out ProjectPropertyGroupElement mainGroup)
         {
             if (string.IsNullOrEmpty(name))
                 throw new ArgumentException($"{nameof(name)} cannot be empty", nameof(name));
@@ -147,7 +92,7 @@ namespace GodotTools.ProjectEditor
             root.DefaultTargets = "Build";
 
             mainGroup = root.AddPropertyGroup();
-            mainGroup.AddProperty("Configuration", "Debug").Condition = " '$(Configuration)' == '' ";
+            mainGroup.AddProperty("Configuration", defaultConfig).Condition = " '$(Configuration)' == '' ";
             mainGroup.AddProperty("Platform", "AnyCPU").Condition = " '$(Platform)' == '' ";
             mainGroup.AddProperty("ProjectGuid", "{" + Guid.NewGuid().ToString().ToUpper() + "}");
             mainGroup.AddProperty("OutputType", "Library");
@@ -184,16 +129,6 @@ namespace GodotTools.ProjectEditor
             return root;
         }
 
-        private static void AddItems(ProjectRootElement elem, string groupName, params string[] items)
-        {
-            var group = elem.AddItemGroup();
-
-            foreach (var item in items)
-            {
-                group.AddItem(groupName, item);
-            }
-        }
-
         private const string AssemblyInfoTemplate =
             @"using System.Reflection;{0}
 
diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
index 15b9e50a8d..618527f916 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
@@ -9,6 +9,7 @@
     <AssemblyName>GodotTools</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <GodotSourceRootPath>$(SolutionDir)/../../../../</GodotSourceRootPath>
+    <DataDirToolsOutputPath>$(GodotSourceRootPath)/bin/GodotSharp/Tools</DataDirToolsOutputPath>
     <GodotApiConfiguration>Debug</GodotApiConfiguration>
     <LangVersion>7</LangVersion>
   </PropertyGroup>
@@ -41,9 +42,11 @@
     <Reference Include="System" />
     <Reference Include="GodotSharp">
       <HintPath>$(GodotSourceRootPath)/bin/GodotSharp/Api/$(GodotApiConfiguration)/GodotSharp.dll</HintPath>
+      <Private>False</Private>
     </Reference>
     <Reference Include="GodotSharpEditor">
       <HintPath>$(GodotSourceRootPath)/bin/GodotSharp/Api/$(GodotApiConfiguration)/GodotSharpEditor.dll</HintPath>
+      <Private>False</Private>
     </Reference>
   </ItemGroup>
   <ItemGroup>
@@ -56,7 +59,6 @@
     <Compile Include="Ides\MonoDevelop\Instance.cs" />
     <Compile Include="Ides\Rider\RiderPathLocator.cs" />
     <Compile Include="Ides\Rider\RiderPathManager.cs" />
-    <Compile Include="Internals\BindingsGenerator.cs" />
     <Compile Include="Internals\EditorProgress.cs" />
     <Compile Include="Internals\GodotSharpDirs.cs" />
     <Compile Include="Internals\Internal.cs" />
@@ -99,5 +101,21 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <Target Name="CopyToDataDir" AfterTargets="Build">
+    <ItemGroup>
+      <GodotToolsCopy Include="$(OutputPath)\GodotTools*.dll" />
+      <GodotToolsCopy Include="$(OutputPath)\Newtonsoft.Json.dll" />
+      <GodotToolsCopy Include="$(OutputPath)\DotNet.Glob.dll" />
+    </ItemGroup>
+    <ItemGroup Condition=" '$(Configuration)' == 'Debug' ">
+      <GodotToolsCopy Include="$(OutputPath)\GodotTools*.pdb" />
+    </ItemGroup>
+    <Copy SourceFiles="@(GodotToolsCopy)" DestinationFolder="$(DataDirToolsOutputPath)" ContinueOnError="false" />
+  </Target>
+  <Target Name="BuildAlwaysCopyToDataDir">
+    <!-- Custom target run by SCons to make sure the CopyToDataDir target is always executed, without having to use DisableFastUpToDateCheck -->
+    <CallTarget Targets="Build" />
+    <CallTarget Targets="CopyToDataDir" />
+  </Target>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/modules/mono/editor/GodotTools/GodotTools/Internals/BindingsGenerator.cs b/modules/mono/editor/GodotTools/GodotTools/Internals/BindingsGenerator.cs
deleted file mode 100644
index 1daa5e138e..0000000000
--- a/modules/mono/editor/GodotTools/GodotTools/Internals/BindingsGenerator.cs
+++ /dev/null
@@ -1,87 +0,0 @@
-using System;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-namespace GodotTools.Internals
-{
-    public class BindingsGenerator : IDisposable
-    {
-        class BindingsGeneratorSafeHandle : SafeHandle
-        {
-            public BindingsGeneratorSafeHandle(IntPtr handle) : base(IntPtr.Zero, true)
-            {
-                this.handle = handle;
-            }
-
-            public override bool IsInvalid => handle == IntPtr.Zero;
-
-            protected override bool ReleaseHandle()
-            {
-                internal_Dtor(handle);
-                return true;
-            }
-        }
-
-        private BindingsGeneratorSafeHandle safeHandle;
-        private bool disposed = false;
-
-        public bool LogPrintEnabled
-        {
-            get => internal_LogPrintEnabled(GetPtr());
-            set => internal_SetLogPrintEnabled(GetPtr(), value);
-        }
-
-        public static uint Version => internal_Version();
-        public static uint CsGlueVersion => internal_CsGlueVersion();
-
-        public Godot.Error GenerateCsApi(string outputDir) => internal_GenerateCsApi(GetPtr(), outputDir);
-
-        internal IntPtr GetPtr()
-        {
-            if (disposed)
-                throw new ObjectDisposedException(GetType().FullName);
-
-            return safeHandle.DangerousGetHandle();
-        }
-
-        public void Dispose()
-        {
-            if (disposed)
-                return;
-
-            if (safeHandle != null && !safeHandle.IsInvalid)
-            {
-                safeHandle.Dispose();
-                safeHandle = null;
-            }
-
-            disposed = true;
-        }
-
-        public BindingsGenerator()
-        {
-            safeHandle = new BindingsGeneratorSafeHandle(internal_Ctor());
-        }
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern IntPtr internal_Ctor();
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern void internal_Dtor(IntPtr handle);
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern bool internal_LogPrintEnabled(IntPtr handle);
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern void internal_SetLogPrintEnabled(IntPtr handle, bool enabled);
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern Godot.Error internal_GenerateCsApi(IntPtr handle, string outputDir);
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern uint internal_Version();
-
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern uint internal_CsGlueVersion();
-    }
-}
diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index 2252f7676d..5b135e97e9 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -40,7 +40,6 @@
 #include "core/os/os.h"
 #include "core/ucaps.h"
 
-#include "../glue/cs_compressed.gen.h"
 #include "../glue/cs_glue_version.gen.h"
 #include "../godotsharp_defs.h"
 #include "../mono_gd/gd_mono_marshal.h"
@@ -874,7 +873,7 @@ void BindingsGenerator::_generate_global_constants(StringBuilder &p_output) {
 	p_output.append("\n#pragma warning restore CS1591\n");
 }
 
-Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir, Vector<String> &r_compile_items) {
+Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir) {
 
 	ERR_FAIL_COND_V(!initialized, ERR_UNCONFIGURED);
 
@@ -887,22 +886,24 @@ Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir, Vect
 	}
 
 	da->change_dir(p_proj_dir);
-	da->make_dir("Core");
-	da->make_dir("ObjectType");
+	da->make_dir("Generated");
+	da->make_dir("Generated/GodotObjects");
 
-	String core_dir = path::join(p_proj_dir, "Core");
-	String obj_type_dir = path::join(p_proj_dir, "ObjectType");
+	String base_gen_dir = path::join(p_proj_dir, "Generated");
+	String godot_objects_gen_dir = path::join(base_gen_dir, "GodotObjects");
+
+	Vector<String> compile_items;
 
 	// Generate source file for global scope constants and enums
 	{
 		StringBuilder constants_source;
 		_generate_global_constants(constants_source);
-		String output_file = path::join(core_dir, BINDINGS_GLOBAL_SCOPE_CLASS "_constants.cs");
+		String output_file = path::join(base_gen_dir, BINDINGS_GLOBAL_SCOPE_CLASS "_constants.cs");
 		Error save_err = _save_file(output_file, constants_source);
 		if (save_err != OK)
 			return save_err;
 
-		r_compile_items.push_back(output_file);
+		compile_items.push_back(output_file);
 	}
 
 	for (OrderedHashMap<StringName, TypeInterface>::Element E = obj_types.front(); E; E = E.next()) {
@@ -911,7 +912,7 @@ Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir, Vect
 		if (itype.api_type == ClassDB::API_EDITOR)
 			continue;
 
-		String output_file = path::join(obj_type_dir, itype.proxy_name + ".cs");
+		String output_file = path::join(godot_objects_gen_dir, itype.proxy_name + ".cs");
 		Error err = _generate_cs_type(itype, output_file);
 
 		if (err == ERR_SKIP)
@@ -920,39 +921,11 @@ Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir, Vect
 		if (err != OK)
 			return err;
 
-		r_compile_items.push_back(output_file);
+		compile_items.push_back(output_file);
 	}
 
 	// Generate sources from compressed files
 
-	Map<String, GodotCsCompressedFile> compressed_files;
-	get_compressed_files(compressed_files);
-
-	for (Map<String, GodotCsCompressedFile>::Element *E = compressed_files.front(); E; E = E->next()) {
-		const String &file_name = E->key();
-		const GodotCsCompressedFile &file_data = E->value();
-
-		String output_file = path::join(core_dir, file_name);
-
-		Vector<uint8_t> data;
-		data.resize(file_data.uncompressed_size);
-		Compression::decompress(data.ptrw(), file_data.uncompressed_size, file_data.data, file_data.compressed_size, Compression::MODE_DEFLATE);
-
-		String output_dir = output_file.get_base_dir();
-
-		if (!DirAccess::exists(output_dir)) {
-			Error err = da->make_dir_recursive(ProjectSettings::get_singleton()->globalize_path(output_dir));
-			ERR_FAIL_COND_V(err != OK, ERR_CANT_CREATE);
-		}
-
-		FileAccessRef file = FileAccess::open(output_file, FileAccess::WRITE);
-		ERR_FAIL_COND_V(!file, ERR_FILE_CANT_WRITE);
-		file->store_buffer(data.ptr(), data.size());
-		file->close();
-
-		r_compile_items.push_back(output_file);
-	}
-
 	StringBuilder cs_icalls_content;
 
 	cs_icalls_content.append("using System;\n"
@@ -986,18 +959,36 @@ Error BindingsGenerator::generate_cs_core_project(const String &p_proj_dir, Vect
 
 	cs_icalls_content.append(INDENT1 CLOSE_BLOCK CLOSE_BLOCK);
 
-	String internal_methods_file = path::join(core_dir, BINDINGS_CLASS_NATIVECALLS ".cs");
+	String internal_methods_file = path::join(base_gen_dir, BINDINGS_CLASS_NATIVECALLS ".cs");
 
 	Error err = _save_file(internal_methods_file, cs_icalls_content);
 	if (err != OK)
 		return err;
 
-	r_compile_items.push_back(internal_methods_file);
+	compile_items.push_back(internal_methods_file);
+
+	StringBuilder includes_props_content;
+	includes_props_content.append("<Project>\n"
+								  "  <ItemGroup>\n");
+
+	for (int i = 0; i < compile_items.size(); i++) {
+		String include = path::relative_to(compile_items[i], p_proj_dir).replace("/", "\\");
+		includes_props_content.append("    <Compile Include=\"" + include + "\" />\n");
+	}
+
+	includes_props_content.append("  </ItemGroup>\n"
+								  "</Project>\n");
+
+	String includes_props_file = path::join(base_gen_dir, "GeneratedIncludes.props");
+
+	err = _save_file(includes_props_file, includes_props_content);
+	if (err != OK)
+		return err;
 
 	return OK;
 }
 
-Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir, Vector<String> &r_compile_items) {
+Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir) {
 
 	ERR_FAIL_COND_V(!initialized, ERR_UNCONFIGURED);
 
@@ -1010,11 +1001,13 @@ Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir, Ve
 	}
 
 	da->change_dir(p_proj_dir);
-	da->make_dir("Core");
-	da->make_dir("ObjectType");
+	da->make_dir("Generated");
+	da->make_dir("Generated/GodotObjects");
+
+	String base_gen_dir = path::join(p_proj_dir, "Generated");
+	String godot_objects_gen_dir = path::join(base_gen_dir, "GodotObjects");
 
-	String core_dir = path::join(p_proj_dir, "Core");
-	String obj_type_dir = path::join(p_proj_dir, "ObjectType");
+	Vector<String> compile_items;
 
 	for (OrderedHashMap<StringName, TypeInterface>::Element E = obj_types.front(); E; E = E.next()) {
 		const TypeInterface &itype = E.get();
@@ -1022,7 +1015,7 @@ Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir, Ve
 		if (itype.api_type != ClassDB::API_EDITOR)
 			continue;
 
-		String output_file = path::join(obj_type_dir, itype.proxy_name + ".cs");
+		String output_file = path::join(godot_objects_gen_dir, itype.proxy_name + ".cs");
 		Error err = _generate_cs_type(itype, output_file);
 
 		if (err == ERR_SKIP)
@@ -1031,7 +1024,7 @@ Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir, Ve
 		if (err != OK)
 			return err;
 
-		r_compile_items.push_back(output_file);
+		compile_items.push_back(output_file);
 	}
 
 	StringBuilder cs_icalls_content;
@@ -1068,13 +1061,31 @@ Error BindingsGenerator::generate_cs_editor_project(const String &p_proj_dir, Ve
 
 	cs_icalls_content.append(INDENT1 CLOSE_BLOCK CLOSE_BLOCK);
 
-	String internal_methods_file = path::join(core_dir, BINDINGS_CLASS_NATIVECALLS_EDITOR ".cs");
+	String internal_methods_file = path::join(base_gen_dir, BINDINGS_CLASS_NATIVECALLS_EDITOR ".cs");
 
 	Error err = _save_file(internal_methods_file, cs_icalls_content);
 	if (err != OK)
 		return err;
 
-	r_compile_items.push_back(internal_methods_file);
+	compile_items.push_back(internal_methods_file);
+
+	StringBuilder includes_props_content;
+	includes_props_content.append("<Project>\n"
+								  "  <ItemGroup>\n");
+
+	for (int i = 0; i < compile_items.size(); i++) {
+		String include = path::relative_to(compile_items[i], p_proj_dir).replace("/", "\\");
+		includes_props_content.append("    <Compile Include=\"" + include + "\" />\n");
+	}
+
+	includes_props_content.append("  </ItemGroup>\n"
+								  "</Project>\n");
+
+	String includes_props_file = path::join(base_gen_dir, "GeneratedIncludes.props");
+
+	err = _save_file(includes_props_file, includes_props_content);
+	if (err != OK)
+		return err;
 
 	return OK;
 }
@@ -1098,9 +1109,8 @@ Error BindingsGenerator::generate_cs_api(const String &p_output_dir) {
 	// Generate GodotSharp source files
 
 	String core_proj_dir = output_dir.plus_file(CORE_API_ASSEMBLY_NAME);
-	Vector<String> core_compile_items;
 
-	proj_err = generate_cs_core_project(core_proj_dir, core_compile_items);
+	proj_err = generate_cs_core_project(core_proj_dir);
 	if (proj_err != OK) {
 		ERR_PRINT("Generation of the Core API C# project failed.");
 		return proj_err;
@@ -1109,22 +1119,14 @@ Error BindingsGenerator::generate_cs_api(const String &p_output_dir) {
 	// Generate GodotSharpEditor source files
 
 	String editor_proj_dir = output_dir.plus_file(EDITOR_API_ASSEMBLY_NAME);
-	Vector<String> editor_compile_items;
 
-	proj_err = generate_cs_editor_project(editor_proj_dir, editor_compile_items);
+	proj_err = generate_cs_editor_project(editor_proj_dir);
 	if (proj_err != OK) {
 		ERR_PRINT("Generation of the Editor API C# project failed.");
 		return proj_err;
 	}
 
-	// Generate solution
-
-	if (!CSharpProject::generate_api_solution(output_dir,
-				core_proj_dir, core_compile_items, editor_proj_dir, editor_compile_items)) {
-		return ERR_CANT_CREATE;
-	}
-
-	_log("The solution for the Godot API was generated successfully\n");
+	_log("The Godot API sources were successfully generated\n");
 
 	return OK;
 }
@@ -3170,7 +3172,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 			if (bindings_generator.generate_glue(glue_dir_path) != OK)
 				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C++ glue.");
 
-			if (bindings_generator.generate_cs_api(glue_dir_path.plus_file("Managed/Generated")) != OK)
+			if (bindings_generator.generate_cs_api(glue_dir_path.plus_file(API_SOLUTION_NAME)) != OK)
 				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C# API.");
 		}
 
diff --git a/modules/mono/editor/bindings_generator.h b/modules/mono/editor/bindings_generator.h
index 07918a2d03..7323e8f635 100644
--- a/modules/mono/editor/bindings_generator.h
+++ b/modules/mono/editor/bindings_generator.h
@@ -635,8 +635,8 @@ class BindingsGenerator {
 	void _initialize();
 
 public:
-	Error generate_cs_core_project(const String &p_proj_dir, Vector<String> &r_compile_files);
-	Error generate_cs_editor_project(const String &p_proj_dir, Vector<String> &r_compile_items);
+	Error generate_cs_core_project(const String &p_proj_dir);
+	Error generate_cs_editor_project(const String &p_proj_dir);
 	Error generate_cs_api(const String &p_output_dir);
 	Error generate_glue(const String &p_output_dir);
 
diff --git a/modules/mono/editor/csharp_project.cpp b/modules/mono/editor/csharp_project.cpp
index 748447005f..ef3644acfd 100644
--- a/modules/mono/editor/csharp_project.cpp
+++ b/modules/mono/editor/csharp_project.cpp
@@ -44,54 +44,6 @@
 
 namespace CSharpProject {
 
-bool generate_api_solution_impl(const String &p_solution_dir, const String &p_core_proj_dir, const Vector<String> &p_core_compile_items,
-		const String &p_editor_proj_dir, const Vector<String> &p_editor_compile_items,
-		GDMonoAssembly *p_tools_project_editor_assembly) {
-
-	GDMonoClass *klass = p_tools_project_editor_assembly->get_class("GodotTools.ProjectEditor", "ApiSolutionGenerator");
-
-	Variant solution_dir = p_solution_dir;
-	Variant core_proj_dir = p_core_proj_dir;
-	Variant core_compile_items = p_core_compile_items;
-	Variant editor_proj_dir = p_editor_proj_dir;
-	Variant editor_compile_items = p_editor_compile_items;
-	const Variant *args[5] = { &solution_dir, &core_proj_dir, &core_compile_items, &editor_proj_dir, &editor_compile_items };
-	MonoException *exc = NULL;
-	klass->get_method("GenerateApiSolution", 5)->invoke(NULL, args, &exc);
-
-	if (exc) {
-		GDMonoUtils::debug_print_unhandled_exception(exc);
-		ERR_FAIL_V(false);
-	}
-
-	return true;
-}
-
-bool generate_api_solution(const String &p_solution_dir, const String &p_core_proj_dir, const Vector<String> &p_core_compile_items,
-		const String &p_editor_proj_dir, const Vector<String> &p_editor_compile_items) {
-
-	if (GDMono::get_singleton()->get_tools_project_editor_assembly()) {
-		return generate_api_solution_impl(p_solution_dir, p_core_proj_dir, p_core_compile_items,
-				p_editor_proj_dir, p_editor_compile_items,
-				GDMono::get_singleton()->get_tools_project_editor_assembly());
-	} else {
-		MonoDomain *temp_domain = GDMonoUtils::create_domain("GodotEngine.Domain.ApiSolutionGeneration");
-		CRASH_COND(temp_domain == NULL);
-		_GDMONO_SCOPE_EXIT_DOMAIN_UNLOAD_(temp_domain);
-
-		_GDMONO_SCOPE_DOMAIN_(temp_domain);
-
-		GDMonoAssembly *tools_project_editor_asm = NULL;
-
-		bool assembly_loaded = GDMono::get_singleton()->load_assembly(TOOLS_PROJECT_EDITOR_ASM_NAME, &tools_project_editor_asm);
-		ERR_FAIL_COND_V_MSG(!assembly_loaded, false, "Failed to load assembly: '" TOOLS_PROJECT_EDITOR_ASM_NAME "'.");
-
-		return generate_api_solution_impl(p_solution_dir, p_core_proj_dir, p_core_compile_items,
-				p_editor_proj_dir, p_editor_compile_items,
-				tools_project_editor_asm);
-	}
-}
-
 void add_item(const String &p_project_path, const String &p_item_type, const String &p_include) {
 
 	if (!GLOBAL_DEF("mono/project/auto_update_project", true))
diff --git a/modules/mono/editor/csharp_project.h b/modules/mono/editor/csharp_project.h
index b42762cea2..cc1d68c3b5 100644
--- a/modules/mono/editor/csharp_project.h
+++ b/modules/mono/editor/csharp_project.h
@@ -35,9 +35,6 @@
 
 namespace CSharpProject {
 
-bool generate_api_solution(const String &p_solution_dir, const String &p_core_proj_dir, const Vector<String> &p_core_compile_items,
-		const String &p_editor_proj_dir, const Vector<String> &p_editor_compile_items);
-
 void add_item(const String &p_project_path, const String &p_item_type, const String &p_include);
 
 } // namespace CSharpProject