SDL: direct3d11: Set the swapchain target immediately after creating it.

SDL Commits
1 
From ba0ba9ef16499f197639d22b1ae96b1c41b16704 Mon Sep 17 00:00:00 2001
From: Ethan Lee <[EMAIL REDACTED]>
Date: Fri, 8 Apr 2022 01:20:36 -0400
Subject: [PATCH] direct3d11: Set the swapchain target immediately after
 creating it.

Fixes #4782
---
 src/render/direct3d11/SDL_render_d3d11.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/render/direct3d11/SDL_render_d3d11.c b/src/render/direct3d11/SDL_render_d3d11.c
index 89e2ee544ea..714ca2e77aa 100644
--- a/src/render/direct3d11/SDL_render_d3d11.c
+++ b/src/render/direct3d11/SDL_render_d3d11.c
@@ -998,6 +998,16 @@ D3D11_CreateWindowSizeDependentResources(SDL_Renderer * renderer)
         goto done;
     }
 
+    /* Set the swap chain target immediately, so that a target is always set
+     * even before we get to SetDrawState. Without this it's possible to hit
+     * null references in places like ReadPixels!
+     */
+    ID3D11DeviceContext_OMSetRenderTargets(data->d3dContext,
+        1,
+        &data->mainRenderTargetView,
+        NULL
+        );
+
     data->viewportDirty = SDL_TRUE;
 
 done: