context reinit support

core/gltexturearray.cpp

@@ -48,6 +48,12 @@ void Texture2DArray::destroy(QOpenGLExtraFunctions * f) {
 }
 
 
+void Texture2DArray::reinit() {
+	texture_ = 0;
+	layers_ = 0;
+}
+
+
 void Texture2DArray::bind(QOpenGLExtraFunctions * f, int channel) {
 	f->glActiveTexture(GL_TEXTURE0 + channel);
 	f->glBindTexture(target_, texture_);