1 files changed, 62 insertions, 0 deletions
diff --git a/vendor/gioui.org/app/egl_windows.go b/vendor/gioui.org/app/egl_windows.go
new file mode 100644
index 0000000..3a95450
--- /dev/null
+++ b/vendor/gioui.org/app/egl_windows.go
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package app
+
+import (
+	"golang.org/x/sys/windows"
+
+	"gioui.org/internal/egl"
+)
+
+type glContext struct {
+	win *window
+	*egl.Context
+}
+
+func init() {
+	drivers = append(drivers, gpuAPI{
+		priority: 2,
+		initializer: func(w *window) (context, error) {
+			disp := egl.NativeDisplayType(w.HDC())
+			ctx, err := egl.NewContext(disp)
+			if err != nil {
+				return nil, err
+			}
+			return &glContext{win: w, Context: ctx}, nil
+		},
+	})
+}
+
+func (c *glContext) Release() {
+	if c.Context != nil {
+		c.Context.Release()
+		c.Context = nil
+	}
+}
+
+func (c *glContext) Refresh() error {
+	c.Context.ReleaseSurface()
+	var (
+		win           windows.Handle
+		width, height int
+	)
+	win, width, height = c.win.HWND()
+	eglSurf := egl.NativeWindowType(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)
+	c.Context.ReleaseCurrent()
+	return nil
+}
+
+func (c *glContext) Lock() error {
+	return c.Context.MakeCurrent()
+}
+
+func (c *glContext) Unlock() {
+	c.Context.ReleaseCurrent()
+}