app/internal/wm: rename confusing app/internal/window

Package wm (for "window manager") is a better fit for the package, and
distinguishes it from the low-level package windows for the Windows API.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/wm/egl_wayland.go

@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build linux,!android,!nowayland freebsd
+
+package wm
+
+import (
+	"errors"
+	"unsafe"
+
+	"gioui.org/internal/egl"
+)
+
+/*
+#cgo linux pkg-config: egl wayland-egl
+#cgo freebsd openbsd LDFLAGS: -lwayland-egl
+#cgo CFLAGS: -DEGL_NO_X11
+
+#include <EGL/egl.h>
+#include <wayland-client.h>
+#include <wayland-egl.h>
+*/
+import "C"
+
+type context struct {
+	win *window
+	*egl.Context
+	eglWin *C.struct_wl_egl_window
+}
+
+func (w *window) NewContext() (Context, error) {
+	disp := egl.NativeDisplayType(unsafe.Pointer(w.display()))
+	ctx, err := egl.NewContext(disp)
+	if err != nil {
+		return nil, err
+	}
+	return &context{Context: ctx, win: w}, nil
+}
+
+func (c *context) Release() {
+	if c.Context != nil {
+		c.Context.Release()
+		c.Context = nil
+	}
+	if c.eglWin != nil {
+		C.wl_egl_window_destroy(c.eglWin)
+		c.eglWin = nil
+	}
+}
+
+func (c *context) MakeCurrent() error {
+	c.Context.ReleaseSurface()
+	if c.eglWin != nil {
+		C.wl_egl_window_destroy(c.eglWin)
+		c.eglWin = nil
+	}
+	surf, width, height := c.win.surface()
+	if surf == nil {
+		return errors.New("wayland: no surface")
+	}
+	eglWin := C.wl_egl_window_create(surf, C.int(width), C.int(height))
+	if eglWin == nil {
+		return errors.New("wayland: wl_egl_window_create failed")
+	}
+	c.eglWin = eglWin
+	eglSurf := egl.NativeWindowType(uintptr(unsafe.Pointer(eglWin)))
+	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
+		return err
+	}
+	return c.Context.MakeCurrent()
+}
+
+func (c *context) Lock() {}
+
+func (c *context) Unlock() {}