Example code does not work?

[arjunmenon]

Hey, i am getting this

> go build .
github.com/go-gl/gl/v3.2-core/gl
github.com/golang-ui/nuklear/nk
# github.com/golang-ui/nuklear/nk
cgo-dwarf-inference:1:17: error: expected '{' before ')' token

was checking the nk-example.

[sp-manuel-jurado]

The same happens to me.

Build example:

...
go: downloading github.com/getlantern/systray v1.2.2
go: downloading github.com/golang-ui/nuklear v0.0.0-20231115163627-2440a671efc5
...
go: downloading github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71
go: downloading github.com/go-gl/glfw v0.0.0-20240506104042-037f3cc74f2a
...
# github.com/getlantern/systray
# [pkg-config --cflags  -- ayatana-appindicator3-0.1]
...
# github.com/go-gl/glfw/v3.2/glfw
...
# github.com/golang-ui/nuklear/nk
cgo-dwarf-inference:1:17: error: expected '{' before ')' token
2024/07/16 15:18:55 Failed to cross compile package: exit status 1.

Import go example:

import (
	"github.com/go-gl/gl/v3.2-core/gl"
	"github.com/go-gl/glfw/v3.2/glfw"
	"github.com/golang-ui/nuklear/nk"
)

Notes:

• Using techknowlogick/xgo@bb15aad for cross compiling (go1.22.5)

[Jamesthe1]

Getting this exact error as well from my own code just by having the inclusion. My go.mod looks like:

module test/nktest

go 1.22.5

require (
	github.com/golang-ui/nuklear v0.0.0-20231115163627-2440a671efc5
	github.com/veandco/go-sdl2 v0.4.40
)

require (
	github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71 // indirect
	github.com/go-gl/glfw v0.0.0-20240506104042-037f3cc74f2a // indirect
	github.com/xlab/android-go v0.0.0-20221106204035-3cc54d5032fa // indirect
)

and my import looks like:

import (
	"log"
	"os"
	"regexp"
	"runtime"
	"strconv"
	"strings"

	"github.com/golang-ui/nuklear/nk"
	"github.com/veandco/go-sdl2/sdl"
)

Even go install github.com/golang-ui/nuklear/nk simply triggers this error without it being present in imports.

Tried indirects as well, same result.

[anibaldeboni]

SDL2 example doesn't work either. It seems like the functions are based on some older nuklear api version, the arguments provided in the examples doesn't match the current api.

[hajimehoshi]

Probably I see the same error.

% go mod init github.com/golang-ui/nuklear
% go mod tidy
% go build ./nk
# github.com/go-gl/glfw/v3.2/glfw
In file included from ../../go/pkg/mod/github.com/go-gl/glfw@v0.0.0-20240506104042-037f3cc74f2a/v3.2/glfw/c_glfw_darwin.go:8:
../../go/pkg/mod/github.com/go-gl/glfw@v0.0.0-20240506104042-037f3cc74f2a/v3.2/glfw/glfw/src/cocoa_window.m:989:9: warning: multiple methods named 'center' found [-Wobjc-multiple-method-names]
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSCollectionViewCompositionalLayout.h:602:19: note: using
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/AppKit.framework/Headers/NSWindow.h:417:1: note: also found
# github.com/golang-ui/nuklear/nk
cgo-dwarf-inference:1:17: error: expected identifier or '{'
__typeof__(enum ) *__cgo__0;
                ^
cgo-dwarf-inference:1:28: error: expected ')'
__typeof__(enum ) *__cgo__0;
                           ^
cgo-dwarf-inference:1:11: note: to match this '('
__typeof__(enum ) *__cgo__0;
          ^
2 errors generated.

My environment is like this:

% go version
go version go1.23.2 darwin/arm64

% fastfetch 
                     ..'          hajimehoshi@Hajimes-MacBook-Pro
                 ,xNMM.           -------------------------------
               .OMMMMo            OS: macOS 15.0.1 arm64
               lMM"               Host: MacBook Pro (14-inch, Nov 2023, Three Thunderbolt 4 ports)
     .;loddo:.  .olloddol;.       Kernel: 24.0.0
   cKMMMMMMMMMMNWMMMMMMMMMM0:     Uptime: 9 days, 14 hours, 12 mins
 .KMMMMMMMMMMMMMMMMMMMMMMMWd.     Packages: 148 (brew), 2 (brew-cask)
 XMMMMMMMMMMMMMMMMMMMMMMMX.       Shell: zsh 5.9
;MMMMMMMMMMMMMMMMMMMMMMMM:        Display (Color LCD): 3600x2338 @ 120Hz (as 1800x1169) [Built-in]
:MMMMMMMMMMMMMMMMMMMMMMMM:        DE: Aqua
.MMMMMMMMMMMMMMMMMMMMMMMMX.       WM: Quartz Compositor
 kMMMMMMMMMMMMMMMMMMMMMMMMWd.     WM Theme: Multicolor (Light)
 'XMMMMMMMMMMMMMMMMMMMMMMMMMMk    Font: .AppleSystemUIFont [System], Helvetica [User]
  'XMMMMMMMMMMMMMMMMMMMMMMMMK.    Cursor: Fill - Black, Outline - White (32px)
    kMMMMMMMMMMMMMMMMMMMMMMd      Terminal: tmux 3.3a
     ;KMMMMMMMWXXWMMMMMMMk.       CPU: Apple M3 Pro (12) @ 4.06 GHz
       "cooc*"    "*coo'"         GPU: Apple M3 Pro (18) [Integrated]
                                  Memory: 15.12 GiB / 18.00 GiB (84%)
                                  Swap: 15.35 GiB / 16.00 GiB (96%)
                                  Disk (/): 320.35 GiB / 926.35 GiB (35%) - apfs [Read-only]
                                  Local IP (en0): 192.168.0.10/24 *
                                  Battery: 80% [AC connected]
                                  Power Adapter: 96W USB-C Power Adapter
                                  Locale: C

[hajimehoshi]

I guess c-for-go failed to treat enums correctly:

// NkInputKey function as declared in nk/nuklear.h:837
func NkInputKey(arg0 *Context, arg1 C.enum_, down Bool) {
	carg0, carg0AllocMap := (*C.struct_nk_context)(unsafe.Pointer(arg0)), cgoAllocsUnknown
	carg1, carg1AllocMap := (C.enum_)(arg1), cgoAllocsUnknown
	cdown, cdownAllocMap := (C.nk_bool)(down), cgoAllocsUnknown
	C.nk_input_key(carg0, carg1, cdown)
	runtime.KeepAlive(cdownAllocMap)
	runtime.KeepAlive(carg1AllocMap)
	runtime.KeepAlive(carg0AllocMap)
}

[hajimehoshi]

xlab/c-for-go#174

[hajimehoshi]

One of the necessary changes is

diff --git a/nk.yml b/nk.yml
index 237576e..bebea9b 100644
--- a/nk.yml
+++ b/nk.yml
@@ -70,6 +70,7 @@ TRANSLATOR:
       - {transform: export}
     const:
       - {action: accept, from: "(?i)^nk_"}
+      - {action: replace, from: "(?i)^nk_bool", to: "BoolType"}
       - {action: replace, from: "(?i)^nk_", to: _}
 
       - {action: ignore, from: _INT8}
       - 

Even with the PR xlab/c-for-go#176 and the above patch, I have not succeeded to compile this yet:

% go build ./nk
# github.com/golang-ui/nuklear/nk
nk/etc.go:26:26: cannot use content (variable of type string) as *byte value in argument to NkTexteditPaste
nk/impl_glfw_common.go:40:9: not enough return values
        have (string)
        want (string, error)
nk/impl_glfw_common.go:111:26: cannot use keyPressed(win, glfw.KeyDelete) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:112:28: cannot use keyPressed(win, glfw.KeyEnter) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:113:28: cannot use keyPressed(win, glfw.KeyKPEnter) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:114:26: cannot use keyPressed(win, glfw.KeyTab) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:115:32: cannot use keyPressed(win, glfw.KeyBackspace) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:116:25: cannot use keyPressed(win, glfw.KeyUp) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:117:27: cannot use keyPressed(win, glfw.KeyDown) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:118:32: cannot use keyPressed(win, glfw.KeyHome) (value of type int32) as Bool value in argument to NkInputKey
nk/impl_glfw_common.go:118:32: too many errors