From f0821d9543b85c6acead185514c0dd4ec5a13f76 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Mon, 24 Nov 2025 18:49:19 -0600
Subject: [PATCH] Use D3D11_COPY_DISCARD when updating our video texture

This ensures the driver knows it doesn't have to synchronize with the previous texture data.
---
 .../video/ffmpeg-renderers/d3d11va.cpp          | 17 +++++++++++++++--
 app/streaming/video/ffmpeg-renderers/d3d11va.h  |  2 +-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/app/streaming/video/ffmpeg-renderers/d3d11va.cpp b/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
index c8401c23..a4da3813 100644
--- a/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
+++ b/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
@@ -129,6 +129,7 @@ bool D3D11VARenderer::createDeviceByAdapterIndex(int adapterIndex, bool* adapter
     DXGI_ADAPTER_DESC1 adapterDesc;
     D3D_FEATURE_LEVEL featureLevel;
     HRESULT hr;
+    ComPtr<ID3D11DeviceContext> deviceContext;
 
     SDL_assert(!m_Device);
     SDL_assert(!m_DeviceContext);
@@ -178,7 +179,7 @@ bool D3D11VARenderer::createDeviceByAdapterIndex(int adapterIndex, bool* adapter
                            D3D11_SDK_VERSION,
                            &m_Device,
                            &featureLevel,
-                           &m_DeviceContext);
+                           &deviceContext);
     if (FAILED(hr)) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                      "D3D11CreateDevice() failed: %x",
@@ -198,6 +199,16 @@ bool D3D11VARenderer::createDeviceByAdapterIndex(int adapterIndex, bool* adapter
         m_DevicesWithFL11Support++;
     }
 
+    hr = deviceContext.As(&m_DeviceContext);
+    if (FAILED(hr)) {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+                     "ID3D11DeviceContext::QueryInterface(ID3D11DeviceContext1) failed: %x",
+                     hr);
+        m_DeviceContext.Reset();
+        m_Device.Reset();
+        goto Exit;
+    }
+
     bool ok;
     m_BindDecoderOutputTextures = !!qEnvironmentVariableIntValue("D3D11VA_FORCE_BIND", &ok);
     if (!ok) {
@@ -805,7 +816,9 @@ void D3D11VARenderer::renderVideo(AVFrame* frame)
     }
     else {
         // Copy this frame into our video texture
-        m_DeviceContext->CopySubresourceRegion(m_VideoTexture.Get(), 0, 0, 0, 0, (ID3D11Resource*)frame->data[0], (int)(intptr_t)frame->data[1], nullptr);
+        m_DeviceContext->CopySubresourceRegion1(m_VideoTexture.Get(), 0, 0, 0, 0,
+                                                (ID3D11Resource*)frame->data[0], (int)(intptr_t)frame->data[1],
+                                                nullptr, D3D11_COPY_DISCARD);
 
         // SRV 0 is always mapped to the video texture
         srvIndex = 0;
diff --git a/app/streaming/video/ffmpeg-renderers/d3d11va.h b/app/streaming/video/ffmpeg-renderers/d3d11va.h
index f62e2414..e1b36858 100644
--- a/app/streaming/video/ffmpeg-renderers/d3d11va.h
+++ b/app/streaming/video/ffmpeg-renderers/d3d11va.h
@@ -60,7 +60,7 @@ private:
     Microsoft::WRL::ComPtr<IDXGIFactory5> m_Factory;
     Microsoft::WRL::ComPtr<ID3D11Device> m_Device;
     Microsoft::WRL::ComPtr<IDXGISwapChain4> m_SwapChain;
-    Microsoft::WRL::ComPtr<ID3D11DeviceContext> m_DeviceContext;
+    Microsoft::WRL::ComPtr<ID3D11DeviceContext1> m_DeviceContext;
     Microsoft::WRL::ComPtr<ID3D11RenderTargetView> m_RenderTargetView;
     SupportedFenceType m_FenceType;
     SDL_mutex* m_ContextLock;