Frontend: Reset/restore GPU state before saving screenshot

Fixes driver crashes in Vulkan.

src/core/system.cpp

@@ -499,9 +499,11 @@ bool System::SaveState(ByteStream* state)
     const u32 screenshot_height = 128;
 
     std::vector<u32> screenshot_buffer;
-    if (m_host_interface->GetDisplay()->WriteDisplayTextureToBuffer(&screenshot_buffer, screenshot_width,
-                                                                    screenshot_height) &&
-        !screenshot_buffer.empty())
+    m_gpu->ResetGraphicsAPIState();
+    const bool screenshot_saved =
+      m_host_interface->GetDisplay()->WriteDisplayTextureToBuffer(&screenshot_buffer, screenshot_width, screenshot_height);
+    m_gpu->RestoreGraphicsAPIState();
+    if (screenshot_saved && !screenshot_buffer.empty())
     {
       header.offset_to_screenshot = static_cast<u32>(state->GetPosition());
       header.screenshot_width = screenshot_width;

src/frontend-common/common_host_interface.cpp

@@ -1947,7 +1947,11 @@ bool CommonHostInterface::SaveScreenshot(const char* filename /* = nullptr */, b
     filename = auto_filename.c_str();
   }
 
-  if (!m_display->WriteDisplayTextureToFile(filename, full_resolution, apply_aspect_ratio))
+  m_system->GetGPU()->ResetGraphicsAPIState();
+  const bool screenshot_saved =
+    m_display->WriteDisplayTextureToFile(filename, full_resolution, apply_aspect_ratio);
+  m_system->GetGPU()->RestoreGraphicsAPIState();
+  if (!screenshot_saved)
   {
     AddFormattedOSDMessage(10.0f, "Failed to save screenshot to '%s'", filename);
     return false;