diff --git a/taichi/rhi/vulkan/vulkan_device.cpp b/taichi/rhi/vulkan/vulkan_device.cpp
index c7fffc2a45b2b..4594cf74942f9 100644
--- a/taichi/rhi/vulkan/vulkan_device.cpp
+++ b/taichi/rhi/vulkan/vulkan_device.cpp
@@ -2787,6 +2787,8 @@ VulkanSurface::~VulkanSurface() {
 
 void VulkanSurface::resize(uint32_t width, uint32_t height) {
   destroy_swap_chain();
+  this->width_ = width;
+  this->height_ = height;
   create_swap_chain();
 }
 
diff --git a/taichi/ui/backends/vulkan/window.cpp b/taichi/ui/backends/vulkan/window.cpp
index bc8482fb5936d..f6d27a4d4ca3d 100644
--- a/taichi/ui/backends/vulkan/window.cpp
+++ b/taichi/ui/backends/vulkan/window.cpp
@@ -27,6 +27,9 @@ void Window::init(Program *prog, const AppConfig &config) {
                                &renderer_->swap_chain(), glfw_window_);
   fps_limit_ = config.fps_limit;
 
+  if (config_.show_window) {
+    resize();
+  }
   prepare_for_next_frame();
 }
 
diff --git a/taichi/ui/common/input_handler.h b/taichi/ui/common/input_handler.h
index 78a79dabf369e..e6987c2171ed7 100644
--- a/taichi/ui/common/input_handler.h
+++ b/taichi/ui/common/input_handler.h
@@ -30,8 +30,11 @@ class InputHandler {
       first_mouse_ = false;
     }
 
-    last_x_ = xpos;
-    last_y_ = ypos;
+    int w, h;
+    glfwGetWindowSize(window, &w, &h);
+
+    last_x_ = xpos / double(w);
+    last_y_ = ypos / double(h);
 
     for (auto f : user_mouse_pos_callbacks_) {
       f(xpos, ypos);
diff --git a/taichi/ui/common/window_base.cpp b/taichi/ui/common/window_base.cpp
index d4fe2468bae4a..7f9434081cd0e 100644
--- a/taichi/ui/common/window_base.cpp
+++ b/taichi/ui/common/window_base.cpp
@@ -100,10 +100,8 @@ void WindowBase::set_is_running(bool value) {
 std::pair<float, float> WindowBase::get_cursor_pos() {
   CHECK_WINDOW_SHOWING;
   float x = input_handler_.last_x();
-  float y = input_handler_.last_y();
+  float y = 1.0 - input_handler_.last_y();
 
-  x = x / (float)config_.width;
-  y = (config_.height - y) / (float)config_.height;
   return std::make_pair(x, y);
 }