#!/usr/bin/env python import json import re import shutil from pathlib import Path def print_file_list(api_filepath, output_dir, headers=False, sources=False): api = {} end = ";" with open(api_filepath) as api_file: api = json.load(api_file) include_gen_folder = Path(output_dir) / "gen" / "include" / "godot_cpp" source_gen_folder = Path(output_dir) / "gen" / "src" for builtin_class in api["builtin_classes"]: if is_pod_type(builtin_class["name"]): continue header_filename = include_gen_folder / "variant" / (camel_to_snake(builtin_class["name"]) + ".hpp") source_filename = source_gen_folder / "variant" / (camel_to_snake(builtin_class["name"]) + ".cpp") if headers: print(str(header_filename.as_posix()), end=end) if sources: print(str(source_filename.as_posix()), end=end) for engine_class in api["classes"]: header_filename = include_gen_folder / "classes" / (camel_to_snake(engine_class["name"]) + ".hpp") source_filename = source_gen_folder / "classes" / (camel_to_snake(engine_class["name"]) + ".cpp") if headers: print(str(header_filename.as_posix()), end=end) if sources: print(str(source_filename.as_posix()), end=end) utility_functions_header_path = include_gen_folder / "variant" / "utility_functions.hpp" utility_functions_source_path = source_gen_folder / "variant" / "utility_functions.cpp" global_constants_header_path = include_gen_folder / "classes" / "global_constants.hpp" if headers: print(str(utility_functions_header_path.as_posix()), end=end) print(str(global_constants_header_path.as_posix()), end=end) if sources: print(str(utility_functions_source_path.as_posix()), end=end) def generate_bindings(api_filepath, use_template_get_node, output_dir="."): api = None target_dir = Path(output_dir) / "gen" with open(api_filepath) as api_file: api = json.load(api_file) shutil.rmtree(target_dir, ignore_errors=True) target_dir.mkdir(parents=True) generate_global_constants(api, target_dir) generate_builtin_bindings(api, target_dir, "float_64") generate_engine_classes_bindings(api, target_dir, use_template_get_node) generate_utility_functions(api, target_dir) builtin_classes = [] # Key is class name, value is boolean where True means the class is refcounted. engine_classes = {} singletons = [] def generate_builtin_bindings(api, output_dir, build_config): global builtin_classes include_gen_folder = Path(output_dir) / "include" / "godot_cpp" / "variant" source_gen_folder = Path(output_dir) / "src" / "variant" include_gen_folder.mkdir(parents=True, exist_ok=True) source_gen_folder.mkdir(parents=True, exist_ok=True) # Store types beforehand. for builtin_api in api["builtin_classes"]: if is_pod_type(builtin_api["name"]): continue builtin_classes.append(builtin_api["name"]) builtin_sizes = {} for size_list in api["builtin_class_sizes"]: if size_list["build_configuration"] == build_config: for size in size_list["sizes"]: builtin_sizes[size["name"]] = size["size"] break # Create a file for Variant size, since that class isn't generated. variant_size_filename = include_gen_folder / "variant_size.hpp" with variant_size_filename.open("+w") as variant_size_file: variant_size_source = [] add_header("variant_size.hpp", variant_size_source) header_guard = "GODOT_CPP_VARIANT_SIZE_HPP" variant_size_source.append(f"#ifndef {header_guard}") variant_size_source.append(f"#define {header_guard}") variant_size_source.append(f'#define GODOT_CPP_VARIANT_SIZE {builtin_sizes["Variant"]}') variant_size_source.append(f"#endif // ! {header_guard}") variant_size_file.write("\n".join(variant_size_source)) for builtin_api in api["builtin_classes"]: if is_pod_type(builtin_api["name"]): continue size = builtin_sizes[builtin_api["name"]] header_filename = include_gen_folder / (camel_to_snake(builtin_api["name"]) + ".hpp") source_filename = source_gen_folder / (camel_to_snake(builtin_api["name"]) + ".cpp") # Check used classes for header include used_classes = set() fully_used_classes = set() class_name = builtin_api["name"] if "constructors" in builtin_api: for constructor in builtin_api["constructors"]: if "arguments" in constructor: for argument in constructor["arguments"]: if is_included(argument["type"], class_name): if "default_value" in argument and argument["type"] != "Variant": fully_used_classes.add(argument["type"]) else: used_classes.add(argument["type"]) if "methods" in builtin_api: for method in builtin_api["methods"]: if "arguments" in method: for argument in method["arguments"]: if is_included(argument["type"], class_name): if "default_value" in argument and argument["type"] != "Variant": fully_used_classes.add(argument["type"]) else: used_classes.add(argument["type"]) if "return_type" in method: if is_included(method["return_type"], class_name): used_classes.add(method["return_type"]) if "members" in builtin_api: for member in builtin_api["members"]: if is_included(member["type"], class_name): used_classes.add(member["type"]) if "indexing_return_type" in builtin_api: if is_included(builtin_api["indexing_return_type"], class_name): used_classes.add(builtin_api["indexing_return_type"]) if "operators" in builtin_api: for operator in builtin_api["operators"]: if "right_type" in operator: if is_included(operator["right_type"], class_name): used_classes.add(operator["right_type"]) for type_name in fully_used_classes: if type_name in used_classes: used_classes.remove(type_name) with header_filename.open("w+") as header_file: header_file.write(generate_builtin_class_header(builtin_api, size, used_classes, fully_used_classes)) with source_filename.open("w+") as source_file: source_file.write(generate_builtin_class_source(builtin_api, size, used_classes, fully_used_classes)) # Create a header with all builtin types for convenience. builtin_header_filename = include_gen_folder / "builtin_types.hpp" with builtin_header_filename.open("w+") as builtin_header_file: builtin_header = [] add_header("builtin_types.hpp", builtin_header) builtin_header.append("#ifndef GODOT_CPP_BUILTIN_TYPES_HPP") builtin_header.append("#define GODOT_CPP_BUILTIN_TYPES_HPP") builtin_header.append("") for builtin in builtin_classes: builtin_header.append(f"#include ") builtin_header.append("") builtin_header.append("#endif // ! GODOT_CPP_BUILTIN_TYPES_HPP") builtin_header_file.write("\n".join(builtin_header)) def generate_builtin_class_header(builtin_api, size, used_classes, fully_used_classes): result = [] class_name = builtin_api["name"] snake_class_name = camel_to_snake(class_name).upper() header_guard = f"GODOT_CPP_{snake_class_name}_HPP" add_header(f"{snake_class_name.lower()}.hpp", result) result.append(f"#ifndef {header_guard}") result.append(f"#define {header_guard}") result.append("") result.append("#include ") result.append("") # Special cases. if class_name == "String": result.append("#include ") for include in fully_used_classes: result.append(f"#include ") if len(fully_used_classes) > 0: result.append("") result.append(f"#include ") result.append("") result.append("namespace godot {") result.append("") for type_name in used_classes: result.append(f"class {type_name};") if len(used_classes) > 0: result.append("") result.append(f"class {class_name} {{") result.append(f"\tstatic constexpr size_t {snake_class_name}_SIZE = {size};") result.append(f"\tuint8_t opaque[{snake_class_name}_SIZE] {{ 0 }};") result.append( f"\t_FORCE_INLINE_ GDNativeTypePtr ptr() const {{ return const_cast(&opaque); }}" ) result.append("") result.append("\tfriend class Variant;") result.append("") result.append("\tstatic struct _MethodBindings {") if "constructors" in builtin_api: for constructor in builtin_api["constructors"]: result.append(f'\t\tGDNativePtrConstructor constructor_{constructor["index"]};') if builtin_api["has_destructor"]: result.append("\t\tGDNativePtrDestructor destructor;") if "methods" in builtin_api: for method in builtin_api["methods"]: result.append(f'\t\tGDNativePtrBuiltInMethod method_{method["name"]};') if "members" in builtin_api: for member in builtin_api["members"]: result.append(f'\t\tGDNativePtrSetter member_{member["name"]}_setter;') result.append(f'\t\tGDNativePtrGetter member_{member["name"]}_getter;') if "indexing_return_type" in builtin_api: result.append(f"\t\tGDNativePtrIndexedSetter indexed_setter;") result.append(f"\t\tGDNativePtrIndexedGetter indexed_getter;") if "is_keyed" in builtin_api and builtin_api["is_keyed"]: result.append(f"\t\tGDNativePtrKeyedSetter keyed_setter;") result.append(f"\t\tGDNativePtrKeyedGetter keyed_getter;") result.append(f"\t\tGDNativePtrKeyedChecker keyed_checker;") if "operators" in builtin_api: for operator in builtin_api["operators"]: if "right_type" in operator: result.append( f'\t\tGDNativePtrOperatorEvaluator operator_{get_operator_id_name(operator["name"])}_{operator["right_type"]};' ) else: result.append(f'\t\tGDNativePtrOperatorEvaluator operator_{get_operator_id_name(operator["name"])};') result.append("\t} _method_bindings;") result.append("") result.append("\tstatic void init_bindings();") result.append("") result.append("public:") copy_constructor_index = -1 if "constructors" in builtin_api: for constructor in builtin_api["constructors"]: method_signature = f"\t{class_name}(" if "arguments" in constructor: method_signature += make_function_parameters( constructor["arguments"], include_default=True, for_builtin=True ) if len(constructor["arguments"]) == 1 and constructor["arguments"][0]["type"] == class_name: copy_constructor_index = constructor["index"] method_signature += ");" result.append(method_signature) # Move constructor. result.append(f'\t{class_name}({class_name} &&other);') # Special cases. if class_name == "String" or class_name == "StringName" or class_name == "NodePath": result.append(f"\t{class_name}(const char *from);") result.append(f"\t{class_name}(const wchar_t *from);") result.append(f"\t{class_name}(const char16_t *from);") result.append(f"\t{class_name}(const char32_t *from);") if "constants" in builtin_api: axis_constants_count = 0 for constant in builtin_api["constants"]: # Special case: Vector3.Axis is the only enum in the bindings. # It's technically not supported by Variant but works for direct access. if class_name == "Vector3" and constant["name"].startswith("AXIS"): if axis_constants_count == 0: result.append("\tenum Axis {") result.append(f'\t\t{constant["name"]} = {constant["value"]},') axis_constants_count += 1 if axis_constants_count == 3: result.append("\t};") else: result.append(f'\tstatic const {correct_type(constant["type"])} {constant["name"]};') if builtin_api["has_destructor"]: result.append(f"\t~{class_name}();") method_list = [] if "methods" in builtin_api: for method in builtin_api["methods"]: method_list.append(method["name"]) vararg = method["is_vararg"] if vararg: result.append("\ttemplate") method_signature = "\t" if "is_static" in method and method["is_static"]: method_signature += "static " if "return_type" in method: method_signature += f'{correct_type(method["return_type"])} ' else: method_signature += "void " method_signature += f'{method["name"]}(' method_arguments = [] if "arguments" in method: method_arguments = method["arguments"] method_signature += make_function_parameters( method_arguments, include_default=True, for_builtin=True, is_vararg=vararg ) method_signature += ")" if method["is_const"]: method_signature += " const" method_signature += ";" result.append(method_signature) # Special cases. if class_name == "String": result.append("\tCharString utf8() const;") result.append("\tCharString ascii() const;") result.append("\tChar16String utf16() const;") result.append("\tChar32String utf32() const;") result.append("\tCharWideString wide_string() const;") if "members" in builtin_api: for member in builtin_api["members"]: if f'get_{member["name"]}' not in method_list: result.append(f'\t{correct_type(member["type"])} get_{member["name"]}() const;') if f'set_{member["name"]}' not in method_list: result.append(f'\tvoid set_{member["name"]}({type_for_parameter(member["type"])}value);') if "operators" in builtin_api: for operator in builtin_api["operators"]: if operator["name"] not in ["in", "xor"]: if "right_type" in operator: result.append( f'\t{correct_type(operator["return_type"])} operator{operator["name"]}({type_for_parameter(operator["right_type"])}other) const;' ) else: result.append( f'\t{correct_type(operator["return_type"])} operator{operator["name"].replace("unary", "")}() const;' ) # Copy assignment. if copy_constructor_index >= 0: result.append(f"\t{class_name} &operator=(const {class_name} &other);") # Move assignment. result.append(f"\t{class_name} &operator=({class_name} &&other);") # Special cases. if class_name == "String": result.append("String &operator=(const char *p_str);") result.append("String &operator=(const wchar_t *p_str);") result.append("String &operator=(const char16_t *p_str);") result.append("String &operator=(const char32_t *p_str);") result.append("bool operator==(const char *p_str) const;") result.append("bool operator==(const wchar_t *p_str) const;") result.append("bool operator==(const char16_t *p_str) const;") result.append("bool operator==(const char32_t *p_str) const;") result.append("bool operator!=(const char *p_str) const;") result.append("bool operator!=(const wchar_t *p_str) const;") result.append("bool operator!=(const char16_t *p_str) const;") result.append("bool operator!=(const char32_t *p_str) const;") result.append("};") if class_name == "String": result.append("") result.append("bool operator==(const char *p_chr, const String &p_str);") result.append("bool operator==(const wchar_t *p_chr, const String &p_str);") result.append("bool operator==(const char16_t *p_chr, const String &p_str);") result.append("bool operator==(const char32_t *p_chr, const String &p_str);") result.append("bool operator!=(const char *p_chr, const String &p_str);") result.append("bool operator!=(const wchar_t *p_chr, const String &p_str);") result.append("bool operator!=(const char16_t *p_chr, const String &p_str);") result.append("bool operator!=(const char32_t *p_chr, const String &p_str);") result.append("String operator+(const char *p_chr, const String &p_str);") result.append("String operator+(const wchar_t *p_chr, const String &p_str);") result.append("String operator+(const char16_t *p_chr, const String &p_str);") result.append("String operator+(const char32_t *p_chr, const String &p_str);") result.append("") result.append("} // namespace godot") result.append(f"#endif // ! {header_guard}") return "\n".join(result) def generate_builtin_class_source(builtin_api, size, used_classes, fully_used_classes): result = [] class_name = builtin_api["name"] snake_class_name = camel_to_snake(class_name) enum_type_name = f"GDNATIVE_VARIANT_TYPE_{snake_class_name.upper()}" add_header(f"{snake_class_name}.cpp", result) result.append("") result.append(f"#include ") result.append("") result.append("#include ") result.append("") result.append("#include ") result.append("") # Only used since the "fully used" is included in header already. for include in used_classes: result.append(f"#include ") if len(used_classes) > 0: result.append("") result.append("#include ") result.append("") result.append("#include ") result.append("") result.append("namespace godot {") result.append("") result.append(f"{class_name}::_MethodBindings {class_name}::_method_bindings;") result.append("") result.append(f"void {class_name}::init_bindings() {{") if "constructors" in builtin_api: for constructor in builtin_api["constructors"]: result.append( f'\t_method_bindings.constructor_{constructor["index"]} = internal::interface->variant_get_ptr_constructor({enum_type_name}, {constructor["index"]});' ) if builtin_api["has_destructor"]: result.append( f"\t_method_bindings.destructor = internal::interface->variant_get_ptr_destructor({enum_type_name});" ) if "methods" in builtin_api: for method in builtin_api["methods"]: # TODO: Add error check for hash mismatch. result.append( f'\t_method_bindings.method_{method["name"]} = internal::interface->variant_get_ptr_builtin_method({enum_type_name}, "{method["name"]}", {method["hash"]});' ) if "members" in builtin_api: for member in builtin_api["members"]: result.append( f'\t_method_bindings.member_{member["name"]}_setter = internal::interface->variant_get_ptr_setter({enum_type_name}, "{member["name"]}");' ) result.append( f'\t_method_bindings.member_{member["name"]}_getter = internal::interface->variant_get_ptr_getter({enum_type_name}, "{member["name"]}");' ) if "indexing_return_type" in builtin_api: result.append( f"\t_method_bindings.indexed_setter = internal::interface->variant_get_ptr_indexed_setter({enum_type_name});" ) result.append( f"\t_method_bindings.indexed_getter = internal::interface->variant_get_ptr_indexed_getter({enum_type_name});" ) if "is_keyed" in builtin_api and builtin_api["is_keyed"]: result.append( f"\t_method_bindings.keyed_setter = internal::interface->variant_get_ptr_keyed_setter({enum_type_name});" ) result.append( f"\t_method_bindings.keyed_getter = internal::interface->variant_get_ptr_keyed_getter({enum_type_name});" ) result.append( f"\t_method_bindings.keyed_checker = internal::interface->variant_get_ptr_keyed_checker({enum_type_name});" ) if "operators" in builtin_api: for operator in builtin_api["operators"]: if "right_type" in operator: result.append( f'\t_method_bindings.operator_{get_operator_id_name(operator["name"])}_{operator["right_type"]} = internal::interface->variant_get_ptr_operator_evaluator(GDNATIVE_VARIANT_OP_{get_operator_id_name(operator["name"]).upper()}, {enum_type_name}, GDNATIVE_VARIANT_TYPE_{camel_to_snake(operator["right_type"]).upper()});' ) else: result.append( f'\t_method_bindings.operator_{get_operator_id_name(operator["name"])} = internal::interface->variant_get_ptr_operator_evaluator(GDNATIVE_VARIANT_OP_{get_operator_id_name(operator["name"]).upper()}, {enum_type_name}, GDNATIVE_VARIANT_TYPE_NIL);' ) result.append("}") result.append("") copy_constructor_index = -1 if "constructors" in builtin_api: for constructor in builtin_api["constructors"]: method_signature = f"{class_name}::{class_name}(" if "arguments" in constructor: method_signature += make_function_parameters( constructor["arguments"], include_default=False, for_builtin=True ) method_signature += ") {" result.append(method_signature) method_call = ( f'\tinternal::_call_builtin_constructor(_method_bindings.constructor_{constructor["index"]}, &opaque' ) if "arguments" in constructor: if len(constructor["arguments"]) == 1 and constructor["arguments"][0]["type"] == class_name: copy_constructor_index = constructor["index"] method_call += ", " arguments = [] for argument in constructor["arguments"]: (encode, arg_name) = get_encoded_arg( argument["name"], argument["type"], argument["meta"] if "meta" in argument else None, ) result += encode arguments.append(arg_name) method_call += ", ".join(arguments) method_call += ");" result.append(method_call) result.append("}") result.append("") # Move constructor. result.append(f'{class_name}::{class_name}({class_name} &&other) {{') result.append("\tstd::swap(opaque, other.opaque);") result.append("}") result.append("") if builtin_api["has_destructor"]: result.append(f"{class_name}::~{class_name}() {{") result.append("\t_method_bindings.destructor(&opaque);") result.append("}") result.append("") method_list = [] if "methods" in builtin_api: for method in builtin_api["methods"]: method_list.append(method["name"]) if "is_vararg" in method and method["is_vararg"]: # Done in the header because of the template. continue method_signature = make_signature(class_name, method, for_builtin=True) result.append(method_signature + "{") method_call = "\t" if "return_type" in method: method_call += f'return internal::_call_builtin_method_ptr_ret<{correct_type(method["return_type"])}>(' else: method_call += f"internal::_call_builtin_method_ptr_no_ret(" method_call += f'_method_bindings.method_{method["name"]}, ' if "is_static" in method and method["is_static"]: method_call += "nullptr" else: method_call += "(GDNativeTypePtr)&opaque" if "arguments" in method: arguments = [] method_call += ", " for argument in method["arguments"]: (encode, arg_name) = get_encoded_arg( argument["name"], argument["type"], argument["meta"] if "meta" in argument else None, ) result += encode arguments.append(arg_name) method_call += ", ".join(arguments) method_call += ");" result.append(method_call) result.append("}") result.append("") if "members" in builtin_api: for member in builtin_api["members"]: if f'get_{member["name"]}' not in method_list: result.append(f'{correct_type(member["type"])} {class_name}::get_{member["name"]}() const {{') result.append( f'\treturn internal::_call_builtin_ptr_getter<{correct_type(member["type"])}>(_method_bindings.member_{member["name"]}_getter, (const GDNativeTypePtr)&opaque);' ) result.append("}") if f'set_{member["name"]}' not in method_list: result.append(f'void {class_name}::set_{member["name"]}({type_for_parameter(member["type"])}value) {{') (encode, arg_name) = get_encoded_arg("value", member["type"], None) result += encode result.append( f'\t_method_bindings.member_{member["name"]}_setter((const GDNativeTypePtr)&opaque, (const GDNativeTypePtr){arg_name});' ) result.append("}") result.append("") if "operators" in builtin_api: for operator in builtin_api["operators"]: if operator["name"] not in ["in", "xor"]: if "right_type" in operator: result.append( f'{correct_type(operator["return_type"])} {class_name}::operator{operator["name"]}({type_for_parameter(operator["right_type"])}other) const {{' ) (encode, arg_name) = get_encoded_arg("other", operator["right_type"], None) result += encode result.append( f'\treturn internal::_call_builtin_operator_ptr<{correct_type(operator["return_type"])}>(_method_bindings.operator_{get_operator_id_name(operator["name"])}_{operator["right_type"]}, (const GDNativeTypePtr)&opaque, (const GDNativeTypePtr){arg_name});' ) result.append("}") else: result.append( f'{correct_type(operator["return_type"])} {class_name}::operator{operator["name"].replace("unary", "")}() const {{' ) result.append( f'\treturn internal::_call_builtin_operator_ptr<{correct_type(operator["return_type"])}>(_method_bindings.operator_{get_operator_id_name(operator["name"])}, (const GDNativeTypePtr)&opaque, (const GDNativeTypePtr)nullptr);' ) result.append("}") result.append("") # Copy assignment. if copy_constructor_index >= 0: result.append(f"{class_name} &{class_name}::operator=(const {class_name} &other) {{") if builtin_api["has_destructor"]: result.append("\t_method_bindings.destructor(&opaque);") (encode, arg_name) = get_encoded_arg( "other", class_name, None, ) result += encode result.append( f"\tinternal::_call_builtin_constructor(_method_bindings.constructor_{copy_constructor_index}, &opaque, {arg_name});" ) result.append("\treturn *this;") result.append("}") result.append("") # Move assignment. result.append(f"{class_name} &{class_name}::operator=({class_name} &&other) {{") result.append("\tstd::swap(opaque, other.opaque);") result.append("\treturn *this;") result.append("}") result.append("") result.append("} //namespace godot") return "\n".join(result) def generate_engine_classes_bindings(api, output_dir, use_template_get_node): global engine_classes global singletons include_gen_folder = Path(output_dir) / "include" / "godot_cpp" / "classes" source_gen_folder = Path(output_dir) / "src" / "classes" include_gen_folder.mkdir(parents=True, exist_ok=True) source_gen_folder.mkdir(parents=True, exist_ok=True) # First create map of classes and singletons. for class_api in api["classes"]: # TODO: Properly setup this singleton since it conflicts with ClassDB in the bindings. if class_api["name"] == "ClassDB": continue engine_classes[class_api["name"]] = class_api["is_refcounted"] for native_struct in api["native_structures"]: engine_classes[native_struct["name"]] = False for singleton in api["singletons"]: singletons.append(singleton["name"]) for class_api in api["classes"]: # TODO: Properly setup this singleton since it conflicts with ClassDB in the bindings. if class_api["name"] == "ClassDB": continue # Check used classes for header include. used_classes = set() fully_used_classes = set() class_name = class_api["name"] header_filename = include_gen_folder / (camel_to_snake(class_api["name"]) + ".hpp") source_filename = source_gen_folder / (camel_to_snake(class_api["name"]) + ".cpp") if "methods" in class_api: for method in class_api["methods"]: if "arguments" in method: for argument in method["arguments"]: type_name = argument["type"] if type_name.endswith("*"): type_name = type_name[:-1] if is_included(type_name, class_name): if is_enum(type_name): fully_used_classes.add(get_enum_class(type_name)) elif "default_value" in argument: fully_used_classes.add(type_name) else: used_classes.add(type_name) if is_refcounted(type_name): fully_used_classes.add("Ref") if "return_value" in method: type_name = method["return_value"]["type"] if type_name.endswith("*"): type_name = type_name[:-1] if is_included(type_name, class_name): if is_enum(type_name): fully_used_classes.add(get_enum_class(type_name)) elif is_variant(type_name): fully_used_classes.add(type_name) else: used_classes.add(type_name) if is_refcounted(type_name): fully_used_classes.add("Ref") if "members" in class_api: for member in class_api["members"]: if is_included(member["type"], class_name): if is_enum(member["type"]): fully_used_classes.add(get_enum_class(member["type"])) else: used_classes.add(member["type"]) if is_refcounted(member["type"]): fully_used_classes.add("Ref") if "inherits" in class_api: if is_included(class_api["inherits"], class_name): fully_used_classes.add(class_api["inherits"]) if is_refcounted(class_api["name"]): fully_used_classes.add("Ref") else: fully_used_classes.add("Wrapped") for type_name in fully_used_classes: if type_name in used_classes: used_classes.remove(type_name) with header_filename.open("w+") as header_file: header_file.write( generate_engine_class_header(class_api, used_classes, fully_used_classes, use_template_get_node) ) with source_filename.open("w+") as source_file: source_file.write( generate_engine_class_source(class_api, used_classes, fully_used_classes, use_template_get_node) ) for native_struct in api["native_structures"]: struct_name = native_struct["name"] snake_struct_name = camel_to_snake(struct_name) header_filename = include_gen_folder / (snake_struct_name + ".hpp") result = [] add_header(f"{snake_struct_name}.hpp", result) header_guard = f"GODOT_CPP_{snake_struct_name.upper()}_HPP" result.append(f"#ifndef {header_guard}") result.append(f"#define {header_guard}") result.append("") result.append("namespace godot {") result.append("") result.append(f"struct {struct_name} {{") for field in native_struct["format"].split(","): result.append(f"\t{field};") result.append("};") result.append("") result.append("} // namespace godot") result.append("") result.append(f"#endif // ! {header_guard}") with header_filename.open("w+") as header_file: header_file.write("\n".join(result)) def generate_engine_class_header(class_api, used_classes, fully_used_classes, use_template_get_node): global singletons result = [] class_name = class_api["name"] snake_class_name = camel_to_snake(class_name).upper() is_singleton = class_name in singletons add_header(f"{snake_class_name.lower()}.hpp", result) header_guard = f"GODOT_CPP_{snake_class_name}_HPP" result.append(f"#ifndef {header_guard}") result.append(f"#define {header_guard}") result.append("") for included in fully_used_classes: result.append(f"#include ") if len(fully_used_classes) > 0: result.append("") if class_name != "Object": result.append("#include ") result.append("") result.append("#include ") result.append("") result.append("namespace godot {") result.append("") for type_name in used_classes: result.append(f"class {type_name};") if len(used_classes) > 0: result.append("") inherits = class_api["inherits"] if "inherits" in class_api else "Wrapped" result.append(f"class {class_name} : public {inherits} {{") result.append(f"\tGDNATIVE_CLASS({class_name}, {inherits})") result.append("") result.append("public:") if "enums" in class_api: for enum_api in class_api["enums"]: result.append(f'\tenum {enum_api["name"]} {{') for value in enum_api["values"]: result.append(f'\t\t{value["name"]} = {value["value"]},') result.append("\t};") result.append("") if is_singleton: result.append(f"\tstatic {class_name} *get_singleton();") result.append("") if "methods" in class_api: for method in class_api["methods"]: if method["is_virtual"]: # Will be done later. continue vararg = "is_vararg" in method and method["is_vararg"] method_signature = "\t" if vararg: method_signature += "private: " method_signature += make_signature( class_name, method, for_header=True, use_template_get_node=use_template_get_node ) result.append(method_signature + ";") if vararg: # Add templated version. result += make_varargs_template(method) # Virtuals now. for method in class_api["methods"]: if not method["is_virtual"]: continue method_signature = "\t" method_signature += make_signature( class_name, method, for_header=True, use_template_get_node=use_template_get_node ) result.append(method_signature + ";") result.append("protected:") result.append("\ttemplate ") result.append("\tstatic void register_virtuals() {") if class_name != "Object": result.append(f"\t\t{inherits}::register_virtuals();") if "methods" in class_api: for method in class_api["methods"]: if not method["is_virtual"]: continue method_name = escape_identifier(method["name"]) result.append( f"\t\tif constexpr (!std::is_same_v) {{" ) result.append(f"\t\t\tBIND_VIRTUAL_METHOD(T, {method_name});") result.append("\t\t}") result.append("\t}") result.append("") result.append("public:") # Special cases. if class_name == "Object": result.append("") result.append("\ttemplate") result.append("\tstatic T *cast_to(Object *p_object);") elif use_template_get_node and class_name == "Node": result.append("\ttemplate") result.append( "\tT *get_node(const NodePath &p_path) const { return Object::cast_to(get_node_internal(p_path)); }" ) # Constructor. result.append("") result.append(f"\t{class_name}();") result.append("") result.append("};") result.append("") result.append("} // namespace godot") result.append(f"#endif // ! {header_guard}") return "\n".join(result) def generate_engine_class_source(class_api, used_classes, fully_used_classes, use_template_get_node): global singletons result = [] class_name = class_api["name"] snake_class_name = camel_to_snake(class_name) inherits = class_api["inherits"] if "inherits" in class_api else "Wrapped" is_singleton = class_name in singletons add_header(f"{snake_class_name}.cpp", result) result.append(f"#include ") result.append("") result.append(f"#include ") result.append(f"#include ") result.append("") for included in used_classes: result.append(f"#include ") if len(used_classes) > 0: result.append(f"") result.append("namespace godot {") result.append("") if is_singleton: result.append(f"{class_name} *{class_name}::get_singleton() {{") result.append( f'\tstatic GDNativeObjectPtr singleton_obj = internal::interface->global_get_singleton("{class_name}");' ) result.append("#ifdef DEBUG_ENABLED") result.append("\tERR_FAIL_COND_V(singleton_obj == nullptr, nullptr);") result.append("#endif // DEBUG_ENABLED") result.append( f"\tstatic {class_name} *singleton = reinterpret_cast<{class_name} *>(internal::interface->object_get_instance_binding(singleton_obj, internal::token, &{class_name}::___binding_callbacks));" ) result.append("\treturn singleton;") result.append("}") result.append("") if "methods" in class_api: for method in class_api["methods"]: if method["is_virtual"]: # Will be done later continue vararg = "is_vararg" in method and method["is_vararg"] # Method signature. method_signature = make_signature(class_name, method, use_template_get_node=use_template_get_node) result.append(method_signature + " {") # Method body. result.append( f'\tstatic GDNativeMethodBindPtr ___method_bind = internal::interface->classdb_get_method_bind("{class_name}", "{method["name"]}", {method["hash"]});' ) method_call = "\t" has_return = "return_value" in method and method["return_value"]["type"] != "void" if has_return: result.append( f'\tCHECK_METHOD_BIND_RET(___method_bind, {get_default_value_for_type(method["return_value"]["type"])});' ) else: result.append(f"\tCHECK_METHOD_BIND(___method_bind);") is_ref = False if not vararg: if has_return: return_type = method["return_value"]["type"] meta_type = method["return_value"]["meta"] if "meta" in method["return_value"] else None if is_pod_type(return_type) or is_variant(return_type) or is_enum(return_type): method_call += f"return internal::_call_native_mb_ret<{correct_type(return_type, meta_type)}>(___method_bind, _owner" elif is_refcounted(return_type): method_call += f"return Ref<{return_type}>::___internal_constructor(internal::_call_native_mb_ret_obj<{return_type}>(___method_bind, _owner" is_ref = True else: method_call += f"return ({correct_type(return_type)})internal::_call_native_mb_ret_obj<{return_type}>(___method_bind, _owner" else: method_call += f"internal::_call_native_mb_no_ret(___method_bind, _owner" if "arguments" in method: method_call += ", " arguments = [] for argument in method["arguments"]: (encode, arg_name) = get_encoded_arg( argument["name"], argument["type"], argument["meta"] if "meta" in argument else None, ) result += encode arguments.append(arg_name) method_call += ", ".join(arguments) else: # vararg. result.append("\tGDNativeCallError error;") result.append("\tVariant ret;") method_call += "internal::interface->object_method_bind_call(___method_bind, _owner, (const GDNativeVariantPtr *)args, arg_count, &ret, &error" if is_ref: method_call += ")" # Close Ref<> constructor. method_call += ");" result.append(method_call) if vararg and ("return_value" in method and method["return_value"]["type"] != "void"): result.append("\treturn ret;") result.append("}") result.append("") # Virtuals now. for method in class_api["methods"]: if not method["is_virtual"]: continue method_signature = make_signature(class_name, method, use_template_get_node=use_template_get_node) method_signature += " {" if "return_value" in method and correct_type(method["return_value"]["type"]) != "void": result.append(method_signature) result.append(f'\treturn {get_default_value_for_type(method["return_value"]["type"])};') result.append("}") else: method_signature += "}" result.append(method_signature) result.append("") # Constructor. result.append(f"{class_name}::{class_name}() : {inherits}(godot::internal::empty_constructor()) {{") result.append( f'\tstatic GDNativeClassConstructor constructor = internal::interface->classdb_get_constructor("{class_name}");' ) result.append("\t_owner = (GodotObject *)constructor();") result.append( f"\tinternal::interface->object_set_instance_binding((GDNativeObjectPtr)_owner, internal::token, this, &{class_name}::___binding_callbacks);" ) result.append("}") result.append("") result.append("} // namespace godot ") return "\n".join(result) def generate_global_constants(api, output_dir): include_gen_folder = Path(output_dir) / "include" / "godot_cpp" / "classes" source_gen_folder = Path(output_dir) / "src" / "classes" include_gen_folder.mkdir(parents=True, exist_ok=True) source_gen_folder.mkdir(parents=True, exist_ok=True) # Generate header header = [] add_header("global_constants.hpp", header) header_filename = include_gen_folder / "global_constants.hpp" header_guard = "GODOT_CPP_GLOBAL_CONSTANTS_HPP" header.append(f"#ifndef {header_guard}") header.append(f"#define {header_guard}") header.append("") header.append("namespace godot {") header.append("") for constant in api["global_constants"]: header.append(f'\tconst int {escape_identifier(constant["name"])} = {constant["value"]};') header.append("") for enum_def in api["global_enums"]: if enum_def["name"].startswith("Variant."): continue header.append(f'\tenum {enum_def["name"]} {{') for value in enum_def["values"]: header.append(f'\t\t{value["name"]} = {value["value"]},') header.append("\t};") header.append("") header.append("} // namespace godot") header.append("") header.append(f"#endif // ! {header_guard}") with header_filename.open("w+") as header_file: header_file.write("\n".join(header)) def generate_utility_functions(api, output_dir): include_gen_folder = Path(output_dir) / "include" / "godot_cpp" / "variant" source_gen_folder = Path(output_dir) / "src" / "variant" include_gen_folder.mkdir(parents=True, exist_ok=True) source_gen_folder.mkdir(parents=True, exist_ok=True) # Generate header. header = [] add_header("utility_functions.hpp", header) header_filename = include_gen_folder / "utility_functions.hpp" header_guard = "GODOT_CPP_UTILITY_FUNCTIONS_HPP" header.append(f"#ifndef {header_guard}") header.append(f"#define {header_guard}") header.append("") header.append("#include ") header.append("#include ") header.append("") header.append("#include ") header.append("") header.append("namespace godot {") header.append("") header.append("class UtilityFunctions {") header.append("public:") for function in api["utility_functions"]: vararg = "is_vararg" in function and function["is_vararg"] function_signature = "\t" function_signature += make_signature("UtilityFunctions", function, for_header=True, static=True) header.append(function_signature + ";") if vararg: # Add templated version. header += make_varargs_template(function, static=True) header.append("};") header.append("") header.append("} // namespace godot") header.append("") header.append(f"#endif // ! {header_guard}") with header_filename.open("w+") as header_file: header_file.write("\n".join(header)) # Generate source. source = [] add_header("utility_functions.cpp", source) source_filename = source_gen_folder / "utility_functions.cpp" source.append("#include ") source.append("") source.append("#include ") source.append("#include ") source.append("") source.append("namespace godot {") source.append("") for function in api["utility_functions"]: vararg = "is_vararg" in function and function["is_vararg"] function_signature = make_signature("UtilityFunctions", function) source.append(function_signature + " {") # Function body. source.append( f'\tstatic GDNativePtrUtilityFunction ___function = internal::interface->variant_get_ptr_utility_function("{function["name"]}", {function["hash"]});' ) has_return = "return_type" in function and function["return_type"] != "void" if has_return: source.append( f'\tCHECK_METHOD_BIND_RET(___function, {get_default_value_for_type(function["return_type"])});' ) else: source.append(f"\tCHECK_METHOD_BIND(___function);") function_call = "\t" if not vararg: if has_return: function_call += "return " if function["return_type"] == "Object": function_call += "internal::_call_utility_ret_obj(___function" else: function_call += f'internal::_call_utility_ret<{correct_type(function["return_type"])}>(___function' else: function_call += "internal::_call_utility_no_ret(___function" if "arguments" in function: function_call += ", " arguments = [] for argument in function["arguments"]: (encode, arg_name) = get_encoded_arg( argument["name"], argument["type"], argument["meta"] if "meta" in argument else None, ) source += encode arguments.append(arg_name) function_call += ", ".join(arguments) else: source.append("\tVariant ret;") function_call += "___function(&ret, (const GDNativeVariantPtr *)args, arg_count" function_call += ");" source.append(function_call) if vararg and has_return: source.append("\treturn ret;") source.append("}") source.append("") source.append("} // namespace godot") with source_filename.open("w+") as source_file: source_file.write("\n".join(source)) # Helper functions. def camel_to_snake(name): name = re.sub("(.)([A-Z][a-z]+)", r"\1_\2", name) name = re.sub("([a-z0-9])([A-Z])", r"\1_\2", name) return name.replace("2_D", "2D").replace("3_D", "3D").lower() def make_function_parameters(parameters, include_default=False, for_builtin=False, is_vararg=False): signature = [] for index, par in enumerate(parameters): parameter = type_for_parameter(par["type"], par["meta"] if "meta" in par else None) parameter_name = escape_identifier(par["name"]) if len(parameter_name) == 0: parameter_name = "arg_" + str(index + 1) parameter += parameter_name if include_default and "default_value" in par and (not for_builtin or par["type"] != "Variant"): parameter += " = " if is_enum(par["type"]): parameter_type = correct_type(par["type"]) if parameter_type == "void": parameter_type = "Variant" parameter += f"({parameter_type})" parameter += correct_default_value(par["default_value"], par["type"]) signature.append(parameter) if is_vararg: signature.append("const Args&... args") return ", ".join(signature) def type_for_parameter(type_name, meta=None): if type_name == "void": return "Variant " elif is_pod_type(type_name) and type_name != "Nil" or is_enum(type_name): return f"{correct_type(type_name, meta)} " elif is_variant(type_name) or is_refcounted(type_name): return f"const {correct_type(type_name)} &" else: return f"{correct_type(type_name)}" def get_include_path(type_name): base_dir = "" if type_name == "Object": base_dir = "core" elif is_variant(type_name): base_dir = "variant" else: base_dir = "classes" return f"{base_dir}/{camel_to_snake(type_name)}.hpp" def get_encoded_arg(arg_name, type_name, type_meta): result = [] name = escape_identifier(arg_name) arg_type = correct_type(type_name) if is_pod_type(arg_type): result.append(f"\t{get_gdnative_type(arg_type)} {name}_encoded;") result.append(f"\tPtrToArg<{correct_type(type_name)}>::encode({name}, &{name}_encoded);") name = f"&{name}_encoded" elif is_engine_class(type_name): name = f"{name}->_owner" else: name = f"&{name}" return (result, name) def make_signature( class_name, function_data, for_header=False, use_template_get_node=True, for_builtin=False, static=False ): function_signature = "" is_vararg = "is_vararg" in function_data and function_data["is_vararg"] if for_header: if "is_virtual" in function_data and function_data["is_virtual"]: function_signature += "virtual " if is_vararg: function_signature += "private: " if static: function_signature += "static " return_type = "void" return_meta = None if "return_type" in function_data: return_type = correct_type(function_data["return_type"]) elif "return_value" in function_data: return_type = function_data["return_value"]["type"] return_meta = function_data["return_value"]["meta"] if "meta" in function_data["return_value"] else None function_signature += correct_type( return_type, return_meta, ) if not function_signature.endswith("*"): function_signature += " " if not for_header: function_signature += f"{class_name}::" function_signature += escape_identifier(function_data["name"]) if is_vararg or ( not for_builtin and use_template_get_node and class_name == "Node" and function_data["name"] == "get_node" ): function_signature += "_internal" function_signature += "(" arguments = function_data["arguments"] if "arguments" in function_data else [] if not is_vararg: function_signature += make_function_parameters(arguments, for_header, for_builtin, is_vararg) else: function_signature += "const Variant **args, GDNativeInt arg_count" function_signature += ")" if "is_const" in function_data and function_data["is_const"]: function_signature += " const" return function_signature def make_varargs_template(function_data, static=False): result = [] function_signature = "\tpublic: template " if static: function_signature += "static " return_type = "void" return_meta = None if "return_type" in function_data: return_type = correct_type(function_data["return_type"]) elif "return_value" in function_data: return_type = function_data["return_value"]["type"] return_meta = function_data["return_value"]["meta"] if "meta" in function_data["return_value"] else None function_signature += correct_type( return_type, return_meta, ) if not function_signature.endswith("*"): function_signature += " " function_signature += f'{escape_identifier(function_data["name"])}' method_arguments = [] if "arguments" in function_data: method_arguments = function_data["arguments"] function_signature += "(" is_vararg = "is_vararg" in function_data and function_data["is_vararg"] function_signature += make_function_parameters(method_arguments, include_default=True, is_vararg=is_vararg) function_signature += ")" if "is_const" in function_data and function_data["is_const"]: function_signature += " const" function_signature += " {" result.append(function_signature) args_array = f"\t\tstd::array variant_args {{ " for argument in method_arguments: if argument["type"] == "Variant": args_array += argument["name"] else: args_array += f'Variant({argument["name"]})' args_array += ", " args_array += "Variant(args)... };" result.append(args_array) result.append(f"\t\tstd::array call_args;") result.append("\t\tfor(size_t i = 0; i < variant_args.size(); i++) {") result.append("\t\t\tcall_args[i] = &variant_args[i];") result.append("\t\t}") call_line = "\t\t" if return_type != "void": call_line += "return " call_line += f'{escape_identifier(function_data["name"])}_internal(call_args.data(), variant_args.size());' result.append(call_line) result.append("\t}") return result # Engine idiosyncrasies. def is_pod_type(type_name): """ Those are types for which no class should be generated. """ return type_name in [ "Nil", "void", "int", "float", "bool", "double", "int32_t", "int64_t", "uint32_t", "uint64_t", ] def is_enum(type_name): return type_name.startswith("enum::") def get_enum_class(enum_name: str): if "." in enum_name: return enum_name.replace("enum::", "").split(".")[0] else: return "GlobalConstants" def get_enum_name(enum_name: str): return enum_name.replace("enum::", "").split(".")[-1] def is_variant(type_name): return type_name == "Variant" or type_name in builtin_classes or type_name == "Nil" def is_engine_class(type_name): global engine_classes return type_name == "Object" or type_name in engine_classes def is_refcounted(type_name): return type_name in engine_classes and engine_classes[type_name] def is_included(type_name, current_type): """ Check if a builtin type should be included. This removes Variant and POD types from inclusion, and the current type. """ to_include = get_enum_class(type_name) if is_enum(type_name) else type_name if to_include == current_type or is_pod_type(to_include): return False if to_include == "GlobalConstants" or to_include == "UtilityFunctions": return True return is_engine_class(to_include) or is_variant(to_include) def correct_default_value(value, type_name): value_map = { "null": "nullptr", '""': "String()", '&""': "StringName()", "[]": "Array()", "{}": "Dictionary()", "Transform2D(1, 0, 0, 1, 0, 0)": "Transform2D()", # Default transform. "Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0)": "Transform3D()", # Default transform. } if value in value_map: return value_map[value] if value == "": return f"{type_name}()" return value def correct_type(type_name, meta=None): type_conversion = {"float": "double", "int": "int64_t", "Nil": "Variant"} if meta != None: if "int" in meta: return f"{meta}_t" else: return meta if type_name in type_conversion: return type_conversion[type_name] if is_enum(type_name): base_class = get_enum_class(type_name) if base_class == "GlobalConstants": return f"{get_enum_name(type_name)}" return f"{base_class}::{get_enum_name(type_name)}" if is_refcounted(type_name): return f"Ref<{type_name}>" if type_name == "Object" or is_engine_class(type_name): return f"{type_name} *" if type_name.endswith("*"): return f"{type_name[:-1]} *" return type_name def get_gdnative_type(type_name): type_conversion_map = { "bool": "uint32_t", "int": "int64_t", "float": "double", } if type_name in type_conversion_map: return type_conversion_map[type_name] return type_name def escape_identifier(id): cpp_keywords_map = { "class": "_class", "char": "_char", "short": "_short", "bool": "_bool", "int": "_int", "default": "_default", "case": "_case", "switch": "_switch", "export": "_export", "template": "_template", "new": "new_", "operator": "_operator", "typeof": "type_of", "typename": "type_name", } if id in cpp_keywords_map: return cpp_keywords_map[id] return id def get_operator_id_name(op): op_id_map = { "==": "equal", "!=": "not_equal", "<": "less", "<=": "less_equal", ">": "greater", ">=": "greater_equal", "+": "add", "-": "subtract", "*": "multiply", "/": "divide", "unary-": "negate", "unary+": "positive", "%": "module", "<<": "shift_left", ">>": "shift_right", "&": "bit_and", "|": "bit_or", "^": "bit_xor", "~": "bit_negate", "and": "and", "or": "or", "xor": "xor", "not": "not", "and": "and", "in": "in", } return op_id_map[op] def get_default_value_for_type(type_name): if type_name == "int": return "0" if type_name == "float": return "0.0" if type_name == "bool": return "false" if is_enum(type_name): return f"{correct_type(type_name)}(0)" if is_variant(type_name): return f"{type_name}()" if is_refcounted(type_name): return f"Ref<{type_name}>()" return "nullptr" header = """\ /*************************************************************************/ /* $filename */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /*************************************************************************/ """ def add_header(filename, lines): desired_length = len(header.split("\n")[0]) pad_spaces = desired_length - 6 - len(filename) for num, line in enumerate(header.split("\n")): if num == 1: new_line = f"/* {filename}{' ' * pad_spaces}*/" lines.append(new_line) else: lines.append(line) lines.append("// THIS FILE IS GENERATED. EDITS WILL BE LOST.") lines.append("")