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_x11.go

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build linux,!android,!nox11 freebsd openbsd
+
+package wm
+
+import (
+	"unsafe"
+
+	"gioui.org/internal/egl"
+)
+
+type x11Context struct {
+	win *x11Window
+	*egl.Context
+}
+
+func (w *x11Window) NewContext() (Context, error) {
+	disp := egl.NativeDisplayType(unsafe.Pointer(w.display()))
+	ctx, err := egl.NewContext(disp)
+	if err != nil {
+		return nil, err
+	}
+	return &x11Context{win: w, Context: ctx}, nil
+}
+
+func (c *x11Context) Release() {
+	if c.Context != nil {
+		c.Context.Release()
+		c.Context = nil
+	}
+}
+
+func (c *x11Context) MakeCurrent() error {
+	c.Context.ReleaseSurface()
+	win, width, height := c.win.window()
+	eglSurf := egl.NativeWindowType(uintptr(win))
+	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
+		return err
+	}
+	if err := c.Context.MakeCurrent(); err != nil {
+		return err
+	}
+	c.Context.EnableVSync(true)
+	return nil
+}
+
+func (c *x11Context) Lock() {}
+
+func (c *x11Context) Unlock() {}