From 3ca5a634288ac960b973eaeffdedafb02fdcc67c Mon Sep 17 00:00:00 2001
From: vrimar <5660247+vrimar@users.noreply.github.com>
Date: Thu, 17 Sep 2026 21:05:41 -0400
Subject: [PATCH] Recreate the main swap chain when only its flags change on
 reset. (#3986)

Context::reset moves the per-surface flags (MSAA, sRGB, HiDPI) off the reset flags onto SwapChain::flags, but every backend's updateResolution gate still compared only the stripped reset flags, so a runtime MSAA change was dropped.
(cherry picked from commit 1ffb270f91a63403c069fcf652bd2411d962b437)
---
 src/renderer_d3d11.cpp  | 1 +
 src/renderer_d3d12.cpp  | 1 +
 src/renderer_gl.cpp     | 1 +
 src/renderer_mtl.cpp    | 1 +
 src/renderer_vk.cpp     | 1 +
 src/renderer_webgpu.cpp | 1 +
 6 files changed, 6 insertions(+)

diff --git a/src/renderer_d3d11.cpp b/src/renderer_d3d11.cpp
index cbcb76237..e0af1e45d 100644
--- a/src/renderer_d3d11.cpp
+++ b/src/renderer_d3d11.cpp
@@ -2541,6 +2541,7 @@ namespace bgfx { namespace d3d11
 			||  m_mainSwapChain.formatDepthStencil != _swapChain.formatDepthStencil
 			||  m_mainSwapChain.nwh                != _swapChain.nwh
 			||  m_mainSwapChain.ndt                != _swapChain.ndt
+			||  m_mainSwapChain.flags              != _swapChain.flags
 			|| (m_reset&maskFlags)   != (_reset&maskFlags)
 			   )
 			{
diff --git a/src/renderer_d3d12.cpp b/src/renderer_d3d12.cpp
index b1d12e5f7..19f4d1c72 100644
--- a/src/renderer_d3d12.cpp
+++ b/src/renderer_d3d12.cpp
@@ -3206,6 +3206,7 @@ namespace bgfx { namespace d3d12
 			||  m_mainSwapChain.formatDepthStencil !=  _swapChain.formatDepthStencil
 			||  m_mainSwapChain.nwh                !=  _swapChain.nwh
 			||  m_mainSwapChain.ndt                !=  _swapChain.ndt
+			||  m_mainSwapChain.flags              !=  _swapChain.flags
 			|| (m_reset&maskFlags)   != (_reset&maskFlags) )
 			{
 				uint32_t flags = _reset & (~BGFX_RESET_INTERNAL_FORCE);
diff --git a/src/renderer_gl.cpp b/src/renderer_gl.cpp
index cafc8fcfc..b0cf366c1 100644
--- a/src/renderer_gl.cpp
+++ b/src/renderer_gl.cpp
@@ -4010,6 +4010,7 @@ namespace bgfx { namespace gl
 			||  m_mainSwapChain.height           !=  _swapChain.height
 			||  m_mainSwapChain.nwh              !=  _swapChain.nwh
 			||  m_mainSwapChain.ndt              !=  _swapChain.ndt
+			||  m_mainSwapChain.flags            !=  _swapChain.flags
 			|| (m_reset&maskFlags) != (_reset&maskFlags) )
 			{
 				uint32_t flags = _reset & (~BGFX_RESET_INTERNAL_FORCE);
diff --git a/src/renderer_mtl.cpp b/src/renderer_mtl.cpp
index 3f7cef368..78bed9efc 100644
--- a/src/renderer_mtl.cpp
+++ b/src/renderer_mtl.cpp
@@ -2131,6 +2131,7 @@ static_assert(BX_COUNTOF(s_accessNames) == Access::Count, "Invalid s_accessNames
 			||  m_mainSwapChain.height           !=  _swapChain.height
 			||  m_mainSwapChain.nwh              !=  _swapChain.nwh
 			||  m_mainSwapChain.ndt              !=  _swapChain.ndt
+			||  m_mainSwapChain.flags            !=  _swapChain.flags
 			|| (m_reset&maskFlags) != (_reset&maskFlags) )
 			{
 				m_mainSwapChain = _swapChain;
diff --git a/src/renderer_vk.cpp b/src/renderer_vk.cpp
index 853e65055..b9aefc034 100644
--- a/src/renderer_vk.cpp
+++ b/src/renderer_vk.cpp
@@ -3290,6 +3290,7 @@ VK_IMPORT_DEVICE
 			||  m_mainSwapChain.height             !=  _swapChain.height
 			||  m_mainSwapChain.nwh                !=  _swapChain.nwh
 			||  m_mainSwapChain.ndt                !=  _swapChain.ndt
+			||  m_mainSwapChain.flags              !=  _swapChain.flags
 			|| (m_reset&maskFlags)   != (_reset&maskFlags)
 			||  m_backBuffer.m_swapChain.m_needToRecreateSurface
 			||  m_backBuffer.m_swapChain.m_needToRecreateSwapchain
diff --git a/src/renderer_webgpu.cpp b/src/renderer_webgpu.cpp
index 4fb260c70..63a159925 100644
--- a/src/renderer_webgpu.cpp
+++ b/src/renderer_webgpu.cpp
@@ -2696,6 +2696,7 @@ WGPU_IMPORT
 			||  m_mainSwapChain.height             != _swapChain.height
 			||  m_mainSwapChain.nwh                != _swapChain.nwh
 			||  m_mainSwapChain.ndt                != _swapChain.ndt
+			||  m_mainSwapChain.flags              != _swapChain.flags
 			||  m_reset              != flags
 				)
 			{