From 498c661fcbaf2d19b8d252e7f461fcf91e6e4406 Mon Sep 17 00:00:00 2001
From: JupiterRider <60042618+JupiterRider@users.noreply.github.com>
Date: Wed, 29 May 2024 19:18:03 +0200
Subject: [PATCH] purego PoC for linux and freebsd

---
 raylib/go.mod                |  5 ++-
 raylib/go.sum                |  2 +
 raylib/purego_unix.go        |  3 --
 raylib/raylib_purego_unix.go | 73 ++++++++++++++++++++++++++++++++++++
 4 files changed, 79 insertions(+), 4 deletions(-)
 create mode 100644 raylib/raylib_purego_unix.go

diff --git a/raylib/go.mod b/raylib/go.mod
index 4dc010b..5866a89 100644
--- a/raylib/go.mod
+++ b/raylib/go.mod
@@ -7,4 +7,7 @@ require (
 	golang.org/x/sys v0.20.0
 )
 
-require golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
+require (
+	github.com/jupiterrider/ffi v0.1.0-beta.8
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
+)
diff --git a/raylib/go.sum b/raylib/go.sum
index 2241fa5..8049303 100644
--- a/raylib/go.sum
+++ b/raylib/go.sum
@@ -1,5 +1,7 @@
 github.com/ebitengine/purego v0.7.1 h1:6/55d26lG3o9VCZX8lping+bZcmShseiqlh2bnUDiPA=
 github.com/ebitengine/purego v0.7.1/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/jupiterrider/ffi v0.1.0-beta.8 h1:9hTtlgc3zHPyQLakD5DxVk0b3x+Ts/emoPxxjjkUApc=
+github.com/jupiterrider/ffi v0.1.0-beta.8/go.mod h1:sOp6VJGFaYyr4APi8gwy6g20QNHv5F8Iq1CVbtC900s=
 golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
 golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842/go.mod h1:XtvwrStGgqGPLc4cjQfWqZHG1YFdYs6swckp8vpsjnc=
 golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
diff --git a/raylib/purego_unix.go b/raylib/purego_unix.go
index 61a5d32..c5e614e 100644
--- a/raylib/purego_unix.go
+++ b/raylib/purego_unix.go
@@ -50,9 +50,6 @@ func loadLibrary() uintptr {
 		panic(fmt.Errorf("version %s of %s doesn't match the required version %s", version, libname, requiredVersion))
 	}
 
-	//DEBUG
-	fmt.Println(version)
-
 	return uintptr(handle)
 }
 
diff --git a/raylib/raylib_purego_unix.go b/raylib/raylib_purego_unix.go
new file mode 100644
index 0000000..0d4aa6f
--- /dev/null
+++ b/raylib/raylib_purego_unix.go
@@ -0,0 +1,73 @@
+//go:build !cgo && (freebsd || linux)
+
+package rl
+
+import (
+	"unsafe"
+
+	"github.com/ebitengine/purego"
+	"github.com/jupiterrider/ffi"
+	"golang.org/x/sys/unix"
+)
+
+// bundle bundles the function pointer "sym" and the ffi call interface "cif"
+type bundle struct {
+	sym uintptr
+	cif ffi.Cif
+}
+
+func newBundle(name string, rType *ffi.Type, aTypes ...*ffi.Type) *bundle {
+	b := new(bundle)
+	var err error
+
+	if b.sym, err = purego.Dlsym(raylibDll, name); err != nil {
+		panic(err)
+	}
+
+	nArgs := uint32(len(aTypes))
+
+	if status := ffi.PrepCif(&b.cif, ffi.DefaultAbi, nArgs, rType, aTypes...); status != ffi.OK {
+		panic(status)
+	}
+
+	return b
+}
+
+var (
+	// raylibDll is the pointer to the shared library
+	raylibDll uintptr
+)
+
+var (
+	initWindow          *bundle
+	closeWindow         *bundle
+	setTraceLogCallback *bundle
+)
+
+func init() {
+	raylibDll = loadLibrary()
+
+	initWindow = newBundle("InitWindow", &ffi.TypeVoid, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypePointer)
+	closeWindow = newBundle("CloseWindow", &ffi.TypeVoid)
+	setTraceLogCallback = newBundle("SetTraceLogCallback", &ffi.TypeVoid, &ffi.TypePointer)
+}
+
+// InitWindow - Initialize window and OpenGL context
+func InitWindow(width int32, height int32, title string) {
+	ctitle, err := unix.BytePtrFromString(title)
+	if err != nil {
+		panic(err)
+	}
+	ffi.Call(&initWindow.cif, initWindow.sym, nil, unsafe.Pointer(&width), unsafe.Pointer(&height), unsafe.Pointer(&ctitle))
+}
+
+// CloseWindow - Close window and unload OpenGL context
+func CloseWindow() {
+	ffi.Call(&closeWindow.cif, closeWindow.sym, nil)
+}
+
+// SetTraceLogCallback - Set custom trace log
+func SetTraceLogCallback(fn TraceLogCallbackFun) {
+	callback := traceLogCallbackWrapper(fn)
+	ffi.Call(&setTraceLogCallback.cif, setTraceLogCallback.sym, nil, unsafe.Pointer(&callback))
+}