diff --git a/Source/Core/VideoBackends/D3D/D3DBase.cpp b/Source/Core/VideoBackends/D3D/D3DBase.cpp
index 0631ded2c0ff..6ed649263e95 100644
--- a/Source/Core/VideoBackends/D3D/D3DBase.cpp
+++ b/Source/Core/VideoBackends/D3D/D3DBase.cpp
@@ -33,29 +33,6 @@ static ComPtr<ID3D11Debug> s_debug;
 static constexpr D3D_FEATURE_LEVEL s_supported_feature_levels[] = {
     D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_1, D3D_FEATURE_LEVEL_10_0};
 
-static bool SupportsS3TCTextures()
-{
-  UINT bc1_support, bc2_support, bc3_support;
-  if (FAILED(device->CheckFormatSupport(DXGI_FORMAT_BC1_UNORM, &bc1_support)) ||
-      FAILED(device->CheckFormatSupport(DXGI_FORMAT_BC2_UNORM, &bc2_support)) ||
-      FAILED(device->CheckFormatSupport(DXGI_FORMAT_BC3_UNORM, &bc3_support)))
-  {
-    return false;
-  }
-
-  return ((bc1_support & bc2_support & bc3_support) & D3D11_FORMAT_SUPPORT_TEXTURE2D) != 0;
-}
-
-static bool SupportsBPTCTextures()
-{
-  // Currently, we only care about BC7. This could be extended to BC6H in the future.
-  UINT bc7_support;
-  if (FAILED(device->CheckFormatSupport(DXGI_FORMAT_BC7_UNORM, &bc7_support)))
-    return false;
-
-  return (bc7_support & D3D11_FORMAT_SUPPORT_TEXTURE2D) != 0;
-}
-
 bool Create(u32 adapter_index, bool enable_debug_layer)
 {
   PFN_D3D11_CREATE_DEVICE d3d11_create_device;
@@ -145,17 +122,6 @@ bool Create(u32 adapter_index, bool enable_debug_layer)
     g_Config.backend_info.bSupportsLogicOp = false;
   }
 
-  g_Config.backend_info.bSupportsST3CTextures = SupportsS3TCTextures();
-  g_Config.backend_info.bSupportsBPTCTextures = SupportsBPTCTextures();
-
-  // Features only supported with a FL11.0+ device.
-  const bool shader_model_5_supported = feature_level >= D3D_FEATURE_LEVEL_11_0;
-  g_Config.backend_info.bSupportsEarlyZ = shader_model_5_supported;
-  g_Config.backend_info.bSupportsBBox = shader_model_5_supported;
-  g_Config.backend_info.bSupportsFragmentStoresAndAtomics = shader_model_5_supported;
-  g_Config.backend_info.bSupportsGSInstancing = shader_model_5_supported;
-  g_Config.backend_info.bSupportsSSAA = shader_model_5_supported;
-
   stateman = std::make_unique<StateManager>();
   return true;
 }
@@ -241,6 +207,16 @@ std::vector<u32> GetAAModes(u32 adapter_index)
 
   return aa_modes;
 }
+
+bool SupportsTextureFormat(DXGI_FORMAT format)
+{
+  UINT support;
+  if (FAILED(device->CheckFormatSupport(format, &support)))
+    return false;
+
+  return (support & D3D11_FORMAT_SUPPORT_TEXTURE2D) != 0;
+}
+
 }  // namespace D3D
 
 }  // namespace DX11
diff --git a/Source/Core/VideoBackends/D3D/D3DBase.h b/Source/Core/VideoBackends/D3D/D3DBase.h
index 5c92c9b18f87..2afaf120e05e 100644
--- a/Source/Core/VideoBackends/D3D/D3DBase.h
+++ b/Source/Core/VideoBackends/D3D/D3DBase.h
@@ -40,6 +40,9 @@ void Destroy();
 // Returns a list of supported AA modes for the current device.
 std::vector<u32> GetAAModes(u32 adapter_index);
 
+// Checks for support of the given texture format.
+bool SupportsTextureFormat(DXGI_FORMAT format);
+
 }  // namespace D3D
 
 }  // namespace DX11
diff --git a/Source/Core/VideoBackends/D3D/main.cpp b/Source/Core/VideoBackends/D3D/main.cpp
index d22b34c99af2..d87965deffa9 100644
--- a/Source/Core/VideoBackends/D3D/main.cpp
+++ b/Source/Core/VideoBackends/D3D/main.cpp
@@ -87,6 +87,25 @@ void VideoBackend::FillBackendInfo()
 
   g_Config.backend_info.Adapters = D3DCommon::GetAdapterNames();
   g_Config.backend_info.AAModes = D3D::GetAAModes(g_Config.iAdapter);
+
+  // Override optional features if we are actually booting.
+  if (D3D::device)
+  {
+    g_Config.backend_info.bSupportsST3CTextures =
+        D3D::SupportsTextureFormat(DXGI_FORMAT_BC1_UNORM) &&
+        D3D::SupportsTextureFormat(DXGI_FORMAT_BC2_UNORM) &&
+        D3D::SupportsTextureFormat(DXGI_FORMAT_BC3_UNORM);
+    g_Config.backend_info.bSupportsBPTCTextures = D3D::SupportsTextureFormat(DXGI_FORMAT_BC7_UNORM);
+
+    // Features only supported with a FL11.0+ device.
+    const bool shader_model_5_supported = D3D::feature_level >= D3D_FEATURE_LEVEL_11_0;
+    g_Config.backend_info.bSupportsEarlyZ = shader_model_5_supported;
+    g_Config.backend_info.bSupportsBBox = shader_model_5_supported;
+    g_Config.backend_info.bSupportsFragmentStoresAndAtomics = shader_model_5_supported;
+    g_Config.backend_info.bSupportsGSInstancing = shader_model_5_supported;
+    g_Config.backend_info.bSupportsSSAA = shader_model_5_supported;
+    g_Config.backend_info.bSupportsGPUTextureDecoding = shader_model_5_supported;
+  }
 }
 
 bool VideoBackend::Initialize(const WindowSystemInfo& wsi)
diff --git a/Source/Core/VideoCommon/FramebufferShaderGen.cpp b/Source/Core/VideoCommon/FramebufferShaderGen.cpp
index c69f07c10d50..dfb86d2be202 100644
--- a/Source/Core/VideoCommon/FramebufferShaderGen.cpp
+++ b/Source/Core/VideoCommon/FramebufferShaderGen.cpp
@@ -410,10 +410,13 @@ std::string GenerateFormatConversionShader(EFBReinterpretType convtype, u32 samp
 {
   std::stringstream ss;
   EmitSamplerDeclarations(ss, 0, 1, samples > 1);
-  EmitPixelMainDeclaration(ss, 1, 0, "float4",
-                           GetAPIType() == APIType::D3D ?
-                               "in float4 ipos : SV_Position, in uint isample : SV_SampleIndex, " :
-                               "");
+  EmitPixelMainDeclaration(
+      ss, 1, 0, "float4",
+      GetAPIType() == APIType::D3D ?
+          (g_ActiveConfig.bSSAA ?
+               "in float4 ipos : SV_Position, in uint isample : SV_SampleIndex, " :
+               "in float4 ipos : SV_Position, ") :
+          "");
   ss << "{\n";
   ss << "  int layer = int(v_tex0.z);\n";
   if (GetAPIType() == APIType::D3D)