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Generate godot compat for dual build
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generate compat

generate compat

Update ci.yml

Update binding_generator.py

generate compat

generate compat

lint python files

Update compat_generator.py

update docs

Update binding_generator.py

Update module_converter.py

also collect defines

Add module converter file that converts module based projects to godot_compat

Update ci.yml

update docs

Update compat_generator.py

lint python files

generate compat

generate compat

generate compat

generate compat

Update ci.yml

fix path issue when caling from outside

Update binding_generator.py

update to also take missing classes/structs

Update binding_generator.py

Generate godot compat for dual build

generate compat

generate compat

Update ci.yml

Update binding_generator.py

generate compat

generate compat

lint python files

Update compat_generator.py

update docs

Update binding_generator.py

Update module_converter.py

also collect defines

Add module converter file that converts module based projects to godot_compat

Update ci.yml

update docs

Update compat_generator.py

lint python files

generate compat

generate compat

generate compat

generate compat

Update ci.yml

fix path issue when caling from outside

Add support for build profiles.

Allow enabling or disabling specific classes (which will not be built).

Allow forwarding from `ClassDB` to `ClassDBSingleton` to support enumerations

update to also take missing classes/structs

Update binding_generator.py

update

update naming of files

add godot mappings.

update and run output_header_mapping.json
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Ughuuu committed Oct 20, 2024
1 parent 1cce4d1 commit bfc5e50
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17 changes: 17 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,23 @@ first-party `godot-cpp` extension.
> for a list of known issues, and be sure to provide feedback on issues and PRs
> which affect your use of this extension.
## Godot and Godot Cpp Compatibility

If you intend to target both building as a GDExtension and as a module using godot repo, you can generate compatibility includes that will target either GDExtension or module, based on the GODOT_MODULE_COMPAT define.

If you want such a thing built, when running the build command, `scons`, make sure you have a file called `output_header_mapping_godot_cpp.json` at root level of this repo. This file needs to have the mappings from `godot` repo. The mappings can be generated by running the `compat_generator.py` script.

Example of how to run `compat_generator.py`:

```
git clone godotengine/godot
python compat_generator.py godot
```

The first argument of `compat_generator.py` is the folder where the repo is (can be godot or godot-cpp repo). If this folder is not given, the current directory is assumed. The output of this is either `output_header_mapping_godot.json` or `output_header_mapping_godot_cpp.json`

Then run the SConstruct build command as usual, and in the `gen/` folder you will now have a new folder, `include/godot_compat` which mirrors the `include/godot_cpp` includes, but have ifdef inside them and either include godot header or godot_cpp header.

## Contributing

We greatly appreciate help in maintaining and extending this project. If you
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62 changes: 53 additions & 9 deletions binding_generator.py
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,9 @@
import json
import re
import shutil
import os
from compat_generator import map_header_files
from header_matcher import match_headers
from pathlib import Path


Expand Down Expand Up @@ -207,6 +210,7 @@ def get_file_list(api_filepath, output_dir, headers=False, sources=False, profil

core_gen_folder = Path(output_dir) / "gen" / "include" / "godot_cpp" / "core"
include_gen_folder = Path(output_dir) / "gen" / "include" / "godot_cpp"
include_gen_compat_folder = Path(output_dir) / "gen" / "include" / "godot_compat"
source_gen_folder = Path(output_dir) / "gen" / "src"

files.append(str((core_gen_folder / "ext_wrappers.gen.inc").as_posix()))
Expand All @@ -220,9 +224,11 @@ def get_file_list(api_filepath, output_dir, headers=False, sources=False, profil
continue

header_filename = include_gen_folder / "variant" / (camel_to_snake(builtin_class["name"]) + ".hpp")
header_compat_filename = include_gen_compat_folder / "variant" / (camel_to_snake(builtin_class["name"]) + ".hpp")
source_filename = source_gen_folder / "variant" / (camel_to_snake(builtin_class["name"]) + ".cpp")
if headers:
files.append(str(header_filename.as_posix()))
files.append(str(header_compat_filename.as_posix()))
if sources:
files.append(str(source_filename.as_posix()))

Expand All @@ -232,9 +238,11 @@ def get_file_list(api_filepath, output_dir, headers=False, sources=False, profil
engine_class["name"] = "ClassDBSingleton"
engine_class["alias_for"] = "ClassDB"
header_filename = include_gen_folder / "classes" / (camel_to_snake(engine_class["name"]) + ".hpp")
header_compat_filename = include_gen_compat_folder / "classes" / (camel_to_snake(engine_class["name"]) + ".hpp")
source_filename = source_gen_folder / "classes" / (camel_to_snake(engine_class["name"]) + ".cpp")
if headers:
files.append(str(header_filename.as_posix()))
files.append(str(header_compat_filename.as_posix()))
if sources and is_class_included(engine_class["name"], build_profile):
files.append(str(source_filename.as_posix()))

Expand All @@ -245,8 +253,10 @@ def get_file_list(api_filepath, output_dir, headers=False, sources=False, profil
snake_struct_name = camel_to_snake(struct_name)

header_filename = include_gen_folder / "classes" / (snake_struct_name + ".hpp")
header_compat_filename = include_gen_compat_folder / "classes" / (snake_struct_name + ".hpp")
if headers:
files.append(str(header_filename.as_posix()))
files.append(str(header_compat_filename.as_posix()))

if headers:
for path in [
Expand Down Expand Up @@ -402,6 +412,7 @@ def generate_bindings(api_filepath, use_template_get_node, bits="64", precision=
generate_builtin_bindings(api, target_dir, real_t + "_" + bits)
generate_engine_classes_bindings(api, target_dir, use_template_get_node)
generate_utility_functions(api, target_dir)
generate_compat_includes(Path(output_dir), target_dir)


CLASS_ALIASES = {
Expand Down Expand Up @@ -1545,6 +1556,46 @@ def generate_engine_classes_bindings(api, output_dir, use_template_get_node):
header_file.write("\n".join(result))


def generate_compat_includes(output_dir: Path, target_dir: Path):
file_types_mapping_godot_cpp_gen = map_header_files(target_dir / "include")
godot_compat = Path("output_header_mapping_godot.json")
levels_to_look_back = 3
while not godot_compat.exists():
godot_compat = ".." / godot_compat
levels_to_look_back -= 1
if levels_to_look_back == 0:
print("Skipping godot_compat")
return
with godot_compat.open() as file:
mapping2 = json.load(file)
# Match the headers
file_types_mapping = match_headers(file_types_mapping_godot_cpp_gen, mapping2)

include_gen_folder = Path(target_dir) / "include"
for file_godot_cpp_name, file_godot_names in file_types_mapping.items():
header_filename = file_godot_cpp_name.replace("godot_cpp", "godot_compat")
header_filepath = include_gen_folder / header_filename
Path(os.path.dirname(header_filepath)).mkdir(parents=True, exist_ok=True)
result = []
snake_header_name = camel_to_snake(header_filename)
add_header(f"{snake_header_name}.hpp", result)

header_guard = f"GODOT_COMPAT_{os.path.splitext(os.path.basename(header_filepath).upper())[0]}_HPP"
result.append(f"#ifndef {header_guard}")
result.append(f"#define {header_guard}")
result.append("")
result.append(f"#ifdef GODOT_MODULE_COMPAT")
for file_godot_name in file_godot_names:
result.append(f"#include <{file_godot_name}>")
result.append(f"#else")
result.append(f"#include <{file_godot_cpp_name}>")
result.append(f"#endif")
result.append("")
result.append(f"#endif // ! {header_guard}")
with header_filepath.open("w+", encoding="utf-8") 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 = []
Expand Down Expand Up @@ -1771,12 +1822,7 @@ def generate_engine_class_header(class_api, used_classes, fully_used_classes, us
if "is_static" in method and method["is_static"]:
continue

vararg = "is_vararg" in method and method["is_vararg"]
if vararg:
method_signature = "\ttemplate <typename... Args> static "
else:
method_signature = "\tstatic "

method_signature = "\tstatic "
return_type = None
if "return_type" in method:
return_type = correct_type(method["return_type"].replace("ClassDBSingleton", "ClassDB"), None, False)
Expand All @@ -1787,9 +1833,7 @@ def generate_engine_class_header(class_api, used_classes, fully_used_classes, us
False,
)
if return_type is not None:
method_signature += return_type
if not method_signature.endswith("*"):
method_signature += " "
method_signature += return_type + " "
else:
method_signature += "void "

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67 changes: 67 additions & 0 deletions compat_generator.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,67 @@
#!/usr/bin/env python

import re
import os
import json
import sys


def parse_header_file(file_path):
types = {"classes": [], "structs": [], "defines": []}

with open(file_path, "r", encoding="utf-8") as file:
content = file.read()

# Regular expressions to match different types
struct_pattern = r"struct\s+[\w\s]*?([a-zA-Z_]\w*)\s*[:{]"
class_pattern = r"class\s+[\w\s]*?([a-zA-Z_]\w*)\s*[:{]"
define_pattern = r"#define\s+([a-zA-Z_]\w*)"

# Extract classes
types["classes"] += re.findall(class_pattern, content)

# Extract structs
types["structs"] += re.findall(struct_pattern, content)

# Extract defines
define_matches = re.findall(define_pattern, content)
types["defines"] += define_matches

# Debug the case where no classes or structs are found
#if len(types["classes"]) == 0 and len(types["structs"]) == 0 and len(types["defines"]) == 0:
# print(f"{file_path} missing things")
return types


def map_header_files(directory):
file_types_mapping = {}

for root, dirs, files in os.walk(directory):
if "thirdparty" in dirs:
dirs.remove("thirdparty")
if "tests" in dirs:
dirs.remove("tests")
if "test" in dirs:
dirs.remove("test")
if "misc" in dirs:
dirs.remove("misc")
for file in files:
if file.endswith(".h") or file.endswith(".hpp"):
relative_path = os.path.relpath(root, directory)
file_path = os.path.join(root, file)
file_types_mapping[f"{relative_path}/{file}"] = parse_header_file(file_path)

return file_types_mapping


if __name__ == "__main__":
# Get current directory
current_directory = os.getcwd()
mapping_name = ""
if len(sys.argv) > 1:
mapping_name = f"_godot"
current_directory = os.path.join(os.getcwd(), sys.argv[1])

file_types_mapping = map_header_files(current_directory)
with open(f"output_header_mapping{mapping_name}.json", "w") as json_file:
json.dump(file_types_mapping, json_file, indent=4)
27 changes: 27 additions & 0 deletions header_matcher.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
import json
from compat_generator import map_header_files

def match_headers(mapping1, mapping2):
matches = {}
for header_file, data1 in mapping1.items():
for header_file2, data2 in mapping2.items():
# Check if classes/defines/structs in header_file1 are present in header_file2
if header_file not in matches:
matches[header_file] = []
if (any(class_name in data2["classes"] for class_name in data1["classes"]) or
any(define_name in data2["defines"] for define_name in data1["defines"]) or
any(define_name in data2["structs"] for define_name in data1["structs"])):
matches[header_file].append(header_file2)
return matches


if __name__ == "__main__":
# Load the two header mappings
with open("output_header_mapping_godot.json", "r") as file:
mapping_godot = json.load(file)
file_types_mapping_godot_cpp_gen = map_header_files("gen/include")
matches = match_headers(file_types_mapping_godot_cpp_gen, mapping_godot)

# Optionally, you can save the matches to a file
with open("header_matches.json", "w") as outfile:
json.dump(matches, outfile, indent=4)
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