vkd3d-proton (d4r, opt-in): VKD3D_D4R_LINEAR_RGBA8=WxH also creates RGBA8 UNORM textures of exactly that size with
unordered access linear and exportable (with VKD3D_D4R_LINEAR_TEXTURES=1), so the d4r shim can write DLSS's packed
RGBA8 output in place (D4R_SHIM_INPLACE=1) instead of copying it. Every selected texture is logged (warn).
Applies on top of 0001-0003.

diff --git a/libs/vkd3d/resource.c b/libs/vkd3d/resource.c
--- a/libs/vkd3d/resource.c
+++ b/libs/vkd3d/resource.c
@@ -720,7 +720,25 @@
             desc->DepthOrArraySize != 1 || desc->SampleDesc.Count != 1 ||
             (desc->Flags & D3D12_RESOURCE_FLAG_ALLOW_DEPTH_STENCIL))
         return false;
-    return format->vk_format == VK_FORMAT_R16G16B16A16_SFLOAT || format->vk_format == VK_FORMAT_A2B10G10R10_UNORM_PACK32;
+    if (format->vk_format == VK_FORMAT_R16G16B16A16_SFLOAT || format->vk_format == VK_FORMAT_A2B10G10R10_UNORM_PACK32)
+        return true;
+    /* VKD3D_D4R_LINEAR_RGBA8=WxH (opt-in, with VKD3D_D4R_LINEAR_TEXTURES=1): also RGBA8 UNORM textures of exactly
+     * that size with unordered access, the shape of a DLSS output, so the shim can write DLSS's packed RGBA8 result
+     * in place. Other RGBA8 targets keep optimal tiling. Every selected texture is logged. */
+    if (format->vk_format == VK_FORMAT_R8G8B8A8_UNORM && (desc->Flags & D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS))
+    {
+        static unsigned int selected;
+        unsigned int width = 0, height = 0;
+        char size[32];
+        if (vkd3d_get_env_var("VKD3D_D4R_LINEAR_RGBA8", size, sizeof(size)) &&
+                sscanf(size, "%ux%u", &width, &height) == 2 && desc->Width == width && desc->Height == height)
+        {
+            WARN("d4r: linear exportable RGBA8 texture #%u (%ux%u, flags %#x).\n", ++selected, width, height,
+                    desc->Flags);
+            return true;
+        }
+    }
+    return false;
 }
 
 static HRESULT vkd3d_get_image_create_info(struct d3d12_device *device,