GDNative Issue

totoro

Sooooo, long night trying on getting GDNative to play, I think it was a git branch issue in the end, amongst other things. *** It appears the GDNative thread is no longer available! I understand Godot 4 is now doing things differently, I will catch up, but for now??? BTW I'm using 3.4

Following: https://docs.godotengine.org/en/3.0/tutorials/plugins/gdnative/gdnative-cpp-example.html

It all appears to compile and build into the right place, however when I run the Godot project, it tries to start (splashscreen) but then fails without error or warning?

--- Debugging process started --- --- Debugging process stopped ---

Any ideas why?

Here's the amended gdexample.cpp

#include "gdexample.h"

using namespace godot;

void gdexample::_register_methods() {
    register_method((char *)"_process", &gdexample::_process);
}

gdexample::gdexample() {
    // initialize any variables here
    time_passed = 0.0;
}

gdexample::~gdexample() {
    // add your cleanup here
}

void gdexample::_process(float delta) {
    time_passed += delta;

    Vector2 new_position = Vector2(10.0 + (10.0 * sin(time_passed * 2.0)), 10.0 + (10.0 * cos(time_passed * 1.5)));

    //owner->set_position(new_position);
    set_position(new_position);
}

And here are the two bin files which are non-amended, dunno if these need something else new and not in the tutorial...?

gdexample.gdnlib

[general]

singleton=false
load_once=true
symbol_prefix="godot_"
reloadable=true

[entry]

OSX.64="res://bin/osx/libgdexample.dylib"
Windows.64="res://bin/win64/libgdexample.dll"
X11.64="res://bin/x11/libgdexample.so"

[dependencies]

OSX.64=[  ]
Windows.64=[  ]
X11.64=[  ]

gdexample.gdns

[gd_resource type="NativeScript" load_steps=2 format=2]

[ext_resource path="res://bin/gdexample.gdnlib" type="GDNativeLibrary" id=1]

[resource]

resource_name = "gdexample"
class_name = "gdexample"
library = ExtResource( 1 )
_sections_unfolded = [ "Resource" ]

Thanks

systemerror

you wrote "...It all appears to compile and build into the right place..." you build with scons like described in docs ? what is the output on screen? what is the size in byte of the dll-file please?

systemerror

and loaded the gdexample.gdnlib in godot?

totoro

Hi, thanks for reply, just popping through today but yes used the suggested Demo project and scons placed the shared object directly into the bin directory, then I made the two descriptor files in the bin directory and the so went in the x11 directory (I'm on a Fedora machine)

The so did look large at 63.6mb but assumed I'd need to tweak the make file (SConstruct) at a later date.

I did add a few extra paths into SConstruct too, not sure which were actually needed, was tired and throughly confused by then :D

SConstruct #!python import os

target = ARGUMENTS.get("target", "debug")
platform = ARGUMENTS.get("platform", "linux")
bits = ARGUMENTS.get("bits", 64)

final_lib_path = 'demo/bin/'

# This makes sure to keep the session environment variables on windows, 
# that way you can run scons in a vs 2017 prompt and it will find all the required tools
env = Environment()
if platform == "windows":
    env = Environment(ENV = os.environ)

def add_sources(sources, directory):
    for file in os.listdir(directory):
        if file.endswith('.cpp'):
            sources.append(directory + '/' + file)

if platform == "osx":
    env.Append(CCFLAGS = ['-g','-O3', '-arch', 'x86_64', '-std=c++14'])
    env.Append(LINKFLAGS = ['-arch', 'x86_64'])

    final_lib_path = final_lib_path + 'osx/'

elif platform == "linux":
    env.Append(CCFLAGS = ['-fPIC', '-g','-O3', '-std=c++14'])

    final_lib_path = final_lib_path + 'x11/'

elif platform == "windows":
    if target == "debug":
        env.Append(CCFLAGS = ['-EHsc', '-D_DEBUG', '-MDd'])
    else:
        env.Append(CCFLAGS = ['-O2', '-EHsc', '-DNDEBUG', '-MD'])

    final_lib_path = final_lib_path + 'win' + str(bits) + '/'

env.Append(CPPPATH=['.', 'src/', "godot_headers/", "godot-headers/", 'godot-cpp/include/', 'godot-cpp/include/godot_cpp/core/', 'godot-cpp/include/godot_cpp/', 'godot-cpp/gen/', 'godot-cpp/gen/include/godot_cpp/', 'godot-cpp/include/core/', 'godot-cpp/include/', 'godot-cpp/include/gen'])
env.Append(LIBPATH="godot-cpp/bin/")
env.Append(LIBS=["libgodot-cpp" + "." + platform + ".debug." + str(bits) + ".a"])

sources = []
add_sources(sources, "src")

library = env.SharedLibrary(target=final_lib_path + 'libgdexample', source=sources)
Default(library)

I will have another attempt on Sunday, but been thinking I may start to use Godot4 and therefore try GDExtension as well...

https://godotengine.org/article/introducing-gd-extensions

Cheers

systemerror

sorry for my try to help, i never programmed Fedora (only Ubuntu and Raspberry pi OS with Qt not Godot). thx for the tip - atm not heard of gd-extensions will have a look...