From f8a7153fdd75ef88c3b9ad98d5e7bd1b14458a57 Mon Sep 17 00:00:00 2001
From: Logan McNaughton <848146+loganmc10@users.noreply.github.com>
Date: Fri, 17 Apr 2026 15:07:15 +0200
Subject: [PATCH] enable vsync if required (#765)

* enable vsync if required

* add note

* more

* more
---
 parallel-rdp/interface.cpp | 13 +++++++++----
 parallel-rdp/interface.hpp |  2 +-
 src/ui/video.rs            |  1 +
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/parallel-rdp/interface.cpp b/parallel-rdp/interface.cpp
index c932a8c..0f78472 100644
--- a/parallel-rdp/interface.cpp
+++ b/parallel-rdp/interface.cpp
@@ -254,7 +254,8 @@ static ImageHandle create_message_image(Vulkan::Device &device, int width,
 }
 
 void rdp_init(void *_window, GFX_INFO _gfx_info, const void *font,
-              size_t font_size, uint32_t save_state_slot) {
+              size_t font_size, uint32_t save_state_slot,
+              bool netplay_enabled) {
   memset(&rdp_device, 0, sizeof(RDP_DEVICE));
 
   window = (SDL_Window *)_window;
@@ -275,13 +276,17 @@ void rdp_init(void *_window, GFX_INFO _gfx_info, const void *font,
     fragment_size = sizeof(plain_fragment_spirv);
   }
 
-  bool window_vsync = 0;
   wsi = new WSI;
   wsi_platform = new SDL_WSIPlatform;
   wsi_platform->set_window(window);
   wsi->set_platform(wsi_platform);
-  wsi->set_present_mode(window_vsync ? PresentMode::SyncToVBlank
-                                     : PresentMode::UnlockedMaybeTear);
+  if (netplay_enabled) {
+    // VK_PRESENT_MODE_MAILBOX_KHR, fallback to VK_PRESENT_MODE_IMMEDIATE_KHR
+    wsi->set_present_mode(PresentMode::UnlockedMaybeTear);
+  } else {
+    // VK_PRESENT_MODE_MAILBOX_KHR, fallback to VK_PRESENT_MODE_FIFO_KHR
+    wsi->set_present_mode(PresentMode::UnlockedNoTearing);
+  }
   wsi->set_backbuffer_srgb(false);
   Context::SystemHandles handles = {};
   if (!::Vulkan::Context::init_loader(
diff --git a/parallel-rdp/interface.hpp b/parallel-rdp/interface.hpp
index da286bf..7182a6b 100644
--- a/parallel-rdp/interface.hpp
+++ b/parallel-rdp/interface.hpp
@@ -37,7 +37,7 @@ typedef struct {
 } CALL_BACK;
 
 void rdp_init(void *_window, GFX_INFO _gfx_info, const void *font,
-              size_t font_size, uint32_t save_state_slot);
+              size_t font_size, uint32_t save_state_slot, bool netplay_enabled);
 void rdp_close();
 void rdp_set_vi_register(uint32_t reg, uint32_t value);
 void rdp_update_screen();
diff --git a/src/ui/video.rs b/src/ui/video.rs
index 56a7c05..b67e656 100644
--- a/src/ui/video.rs
+++ b/src/ui/video.rs
@@ -99,6 +99,7 @@ pub fn init(device: &mut device::Device) {
             font_bytes.as_ptr() as *const std::ffi::c_void,
             font_bytes.len(),
             device.ui.storage.save_state_slot,
+            device.netplay.is_some(),
         )
     }
 }