Don't crash when level doesn't have fast geometry

Author: Xottab-DUTY

src/Layers/xrRender/FVisual.cpp

@@ -54,9 +54,9 @@ void Fvisual::Load(const char* N, IReader* data, u32 dwFlags)
 #endif
         // check for fast-vertices
 #if RENDER == R_R1
-        if (data->find_chunk(OGF_FASTPATH) && ps_r1_force_geomx)
+        if (RImplementation.IsFastGeomSupported() && data->find_chunk(OGF_FASTPATH) && ps_r1_force_geomx)
 #else
-        if (data->find_chunk(OGF_FASTPATH))
+        if (RImplementation.IsFastGeomSupported() && data->find_chunk(OGF_FASTPATH))
 #endif
         {
             destructor<IReader> geomdef(data->open_chunk(OGF_FASTPATH));

src/Layers/xrRender_R2/r2.h

@@ -335,6 +335,8 @@ class CRender final : public D3DXRenderBase
 
     bool m_bFirstFrameAfterReset{}; // Determines weather the frame is the first after resetting device.
 
+    bool m_fast_geom_loaded{};
+
 private:
     // Loading / Unloading
     void LoadBuffers(CStreamReader* fs, bool alternative);
@@ -404,6 +406,12 @@ class CRender final : public D3DXRenderBase
 #   error No graphics API selected or enabled!
 #endif
 
+    [[nodiscard]]
+    bool IsFastGeomSupported() const
+    {
+        return m_fast_geom_loaded;
+    }
+
     // Loading / Unloading
     void create() override;
     void destroy() override;

src/Layers/xrRender_R2/r2_loader.cpp

@@ -67,11 +67,11 @@ void CRender::level_Load(IReader* fs)
         }
 
         //...and alternate/fast geometry
+        if (CStreamReader* geom = FS.rs_open("$level$", "level.geomX"))
         {
-            CStreamReader* geom = FS.rs_open("$level$", "level.geomx");
-            R_ASSERT2(geom, "level.geomX");
             LoadBuffers(geom, true);
             FS.r_close(geom);
+            m_fast_geom_loaded = true;
         }
 
         // Visuals
@@ -177,6 +177,8 @@ void CRender::level_Unload()
     nDC.clear();
     xDC.clear();
 
+    m_fast_geom_loaded = false;
+
     //*** Components
     xr_delete(Details);
     xr_delete(Wallmarks);