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/gl_macos.go

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build darwin,!ios
+
+package wm
+
+import (
+	"gioui.org/gpu"
+	"gioui.org/internal/gl"
+)
+
+/*
+#include <CoreFoundation/CoreFoundation.h>
+#include <CoreGraphics/CoreGraphics.h>
+#include <AppKit/AppKit.h>
+#include <OpenGL/gl3.h>
+
+__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createGLView(void);
+__attribute__ ((visibility ("hidden"))) CFTypeRef gio_contextForView(CFTypeRef viewRef);
+__attribute__ ((visibility ("hidden"))) void gio_makeCurrentContext(CFTypeRef ctx);
+__attribute__ ((visibility ("hidden"))) void gio_flushContextBuffer(CFTypeRef ctx);
+__attribute__ ((visibility ("hidden"))) void gio_clearCurrentContext(void);
+__attribute__ ((visibility ("hidden"))) void gio_lockContext(CFTypeRef ctxRef);
+__attribute__ ((visibility ("hidden"))) void gio_unlockContext(CFTypeRef ctxRef);
+*/
+import "C"
+
+type context struct {
+	c    *gl.Functions
+	ctx  C.CFTypeRef
+	view C.CFTypeRef
+}
+
+func init() {
+	viewFactory = func() C.CFTypeRef {
+		return C.gio_createGLView()
+	}
+}
+
+func newContext(w *window) (*context, error) {
+	view := w.contextView()
+	ctx := C.gio_contextForView(view)
+	c := &context{
+		ctx:  ctx,
+		view: view,
+	}
+	return c, nil
+}
+
+func (c *context) API() gpu.API {
+	return gpu.OpenGL{}
+}
+
+func (c *context) Release() {
+	c.Lock()
+	defer c.Unlock()
+	C.gio_clearCurrentContext()
+	// We could release the context with [view clearGLContext]
+	// and rely on [view openGLContext] auto-creating a new context.
+	// However that second context is not properly set up by
+	// OpenGLContextView, so we'll stay on the safe side and keep
+	// the first context around.
+}
+
+func (c *context) Present() error {
+	// Assume the caller already locked the context.
+	C.glFlush()
+	return nil
+}
+
+func (c *context) Lock() {
+	C.gio_lockContext(c.ctx)
+}
+
+func (c *context) Unlock() {
+	C.gio_unlockContext(c.ctx)
+}
+
+func (c *context) MakeCurrent() error {
+	c.Lock()
+	defer c.Unlock()
+	C.gio_makeCurrentContext(c.ctx)
+	return nil
+}
+
+func (w *window) NewContext() (Context, error) {
+	return newContext(w)
+}