app,internal/window: extract native window code to separate package

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

app/internal/window/egl_wayland.go

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build linux,!android
+
+package window
+
+import (
+	"errors"
+	"sync"
+	"unsafe"
+)
+
+/*
+#cgo LDFLAGS: -lwayland-egl
+
+#include <EGL/egl.h>
+#include <wayland-client.h>
+#include <wayland-egl.h>
+*/
+import "C"
+
+var eglWindows struct {
+	mu      sync.Mutex
+	windows map[*C.struct_wl_surface]*C.struct_wl_egl_window
+}
+
+func (w *window) eglDestroy() {
+	surf, _, _ := w.surface()
+	if surf == nil {
+		return
+	}
+	eglWindows.mu.Lock()
+	defer eglWindows.mu.Unlock()
+	if eglWin, ok := eglWindows.windows[surf]; ok {
+		C.wl_egl_window_destroy(eglWin)
+		delete(eglWindows.windows, surf)
+	}
+}
+
+func (w *window) eglDisplay() _EGLNativeDisplayType {
+	return _EGLNativeDisplayType(w.display())
+}
+
+func (w *window) eglWindow(visID int) (_EGLNativeWindowType, int, int, error) {
+	surf, width, height := w.surface()
+	if surf == nil {
+		return nilEGLNativeWindowType, 0, 0, errors.New("wayland: no surface")
+	}
+	eglWindows.mu.Lock()
+	defer eglWindows.mu.Unlock()
+	eglWin, ok := eglWindows.windows[surf]
+	if !ok {
+		if eglWindows.windows == nil {
+			eglWindows.windows = make(map[*C.struct_wl_surface]*C.struct_wl_egl_window)
+		}
+		eglWin = C.wl_egl_window_create(surf, C.int(width), C.int(height))
+		if eglWin == nil {
+			return nilEGLNativeWindowType, 0, 0, errors.New("wayland: wl_egl_create_window failed")
+		}
+		eglWindows.windows[surf] = eglWin
+	}
+	C.wl_egl_window_resize(eglWin, C.int(width), C.int(height), 0, 0)
+	return _EGLNativeWindowType(uintptr(unsafe.Pointer(eglWin))), width, height, nil
+}