Better version management for active FSR-FG feature

OptiScaler/framegen/ffx/FSRFG_Dx12.cpp

@@ -193,16 +193,17 @@ void FSRFG_Dx12::ConfigureFramePaceTuning()
 
 feature_version FSRFG_Dx12::Version()
 {
+
+    if (_fgContext == nullptr && _version.major == 0)
+    {
     if (!FfxApiProxy::IsFGReady())
         FfxApiProxy::InitFfxDx12();
 
     if (FfxApiProxy::IsFGReady())
-    {
-        auto ver = FfxApiProxy::VersionDx12_FG();
-        return ver;
+            _version = FfxApiProxy::VersionDx12_FG();
     }
 
-    return { 0, 0, 0 };
+    return _version;
 }
 
 HWND FSRFG_Dx12::Hwnd() { return _hwnd; }
@@ -551,6 +552,7 @@ void FSRFG_Dx12::DestroyFGContext()
 {
     _frameCount = 1;
     _lastDispatchedFrame = 0;
+    _version = {};
 
     LOG_DEBUG("");
 
@@ -825,6 +827,8 @@ void FSRFG_Dx12::CreateContext(ID3D12Device* device, FG_Constants& fgConstants)
     override.versionId = State::Instance().ffxFGVersionIds[Config::Instance()->FfxFGIndex.value_or_default()];
     backendDesc.header.pNext = &override.header;
 
+    ParseVersion(State::Instance().ffxFGVersionNames[Config::Instance()->FfxFGIndex.value_or_default()], &_version);
+
     ffxReturnCode_t retCode = FfxApiProxy::D3D12_CreateContext(&_fgContext, &createFg.header, nullptr);
 
     State::Instance().skipHeapCapture = false;

OptiScaler/framegen/ffx/FSRFG_Dx12.h

@@ -16,6 +16,7 @@ class FSRFG_Dx12 : public virtual IFGFeature_Dx12
     ffxContext _fgContext = nullptr;
     FfxApiSurfaceFormat _lastHudlessFormat = FFX_API_SURFACE_FORMAT_UNKNOWN;
     FfxApiSurfaceFormat _usingHudlessFormat = FFX_API_SURFACE_FORMAT_UNKNOWN;
+    feature_version _version { 0, 0, 0 };
 
     uint32_t _maxRenderWidth = 0;
     uint32_t _maxRenderHeight = 0;
@@ -62,6 +63,25 @@ class FSRFG_Dx12 : public virtual IFGFeature_Dx12
     bool UIFormatTransfer(int index, ID3D12Device* device, ID3D12GraphicsCommandList* cmdList, DXGI_FORMAT targetFormat,
                           Dx12Resource* resource);
 
+    void ParseVersion(const char* version_str, feature_version* _version)
+    {
+        const char* p = version_str;
+
+        // Skip non-digits at front
+        while (*p)
+        {
+            if (isdigit((unsigned char) p[0]))
+            {
+                if (sscanf(p, "%u.%u.%u", &_version->major, &_version->minor, &_version->patch) == 3)
+                    return;
+            }
+
+            ++p;
+        }
+
+        LOG_WARN("can't parse {0}", version_str);
+    }
+
   protected:
     void ReleaseObjects() override final;
     void CreateObjects(ID3D12Device* InDevice) override final;