Check available texture units in shadow mapping settings

src/graphics/engine/engine.cpp

@@ -2908,9 +2908,14 @@ int CEngine::GetTextureAnisotropyLevel()
     return m_textureAnisotropy;
 }
 
+bool CEngine::IsShadowMappingSupported()
+{
+    return m_device->IsShadowMappingSupported() && m_device->GetMaxTextureStageCount() >= 3;
+}
+
 void CEngine::SetShadowMapping(bool value)
 {
-    if(!m_device->IsShadowMappingSupported()) value = false;
+    if(!IsShadowMappingSupported()) value = false;
     if(value == m_shadowMapping) return;
     m_shadowMapping = value;
     if(!value)
@@ -2962,8 +2967,14 @@ int CEngine::GetShadowMappingOffscreenResolution()
     return m_offscreenShadowRenderingResolution;
 }
 
+bool CEngine::IsShadowMappingQualitySupported()
+{
+    return IsShadowMappingSupported() && m_device->GetMaxTextureStageCount() >= 6;
+}
+
 void CEngine::SetShadowMappingQuality(bool value)
 {
+    if(!IsShadowMappingQualitySupported()) value = false;
     m_qualityShadows = value;
 }
 
@@ -3445,14 +3456,6 @@ void CEngine::RenderShadowMap()
 
     if (!m_shadowMapping) return;
 
-    if (m_device->GetMaxTextureStageCount() < 3)
-    {
-        m_shadowMapping = false;
-        GetLogger()->Error("Cannot use shadow maps, not enough texture units\n");
-        GetLogger()->Error("Disabling shadow mapping\n");
-        return;
-    }
-
     m_app->StartPerformanceCounter(PCNT_RENDER_SHADOW_MAP);
 
     // If no shadow map texture exists, create it
@@ -3636,14 +3639,6 @@ void CEngine::UseShadowMapping(bool enable)
         m_device->SetShadowColor(m_shadowColor);
 
         if (m_qualityShadows)
-        {
-            if (m_device->GetMaxTextureStageCount() < 6)
-            {
-                m_qualityShadows = false;
-                GetLogger()->Error("Cannot use quality shadow maps, not enough texture units\n");
-                GetLogger()->Error("Attempting to use lower quality shadow maps\n");
-            }
-            else
         {
             // Texture Unit 2
             m_device->SetTextureEnabled(2, true);
@@ -3725,7 +3720,6 @@ void CEngine::UseShadowMapping(bool enable)
 
             m_device->SetTextureStageParams(5, params);
         }
-        }
         else        // Simpler shadows
         {
             // Texture Unit 2

src/graphics/engine/engine.h

@@ -1087,12 +1087,14 @@ public:
 
     //@{
     //! Management of shadow mapping
+    bool            IsShadowMappingSupported();
     void            SetShadowMapping(bool value);
     bool            GetShadowMapping();
     void            SetShadowMappingOffscreen(bool value);
     bool            GetShadowMappingOffscreen();
     void            SetShadowMappingOffscreenResolution(int resolution);
     int             GetShadowMappingOffscreenResolution();
+    bool            IsShadowMappingQualitySupported();
     void            SetShadowMappingQuality(bool value);
     bool            GetShadowMappingQuality();
     //@}

src/ui/screen/screen_setup_graphics.cpp

@@ -253,7 +253,7 @@ void CScreenSetupGraphics::CreateInterface()
         shadowOptions[0] = "Screen buffer"; // TODO: Is this the proper name for this?
     }
     pes->SetPossibleValues(shadowOptions);
-    if (!m_engine->GetDevice()->IsShadowMappingSupported())
+    if (!m_engine->IsShadowMappingSupported())
     {
         pes->ClearState(STATE_ENABLE);
     }
@@ -270,6 +270,10 @@ void CScreenSetupGraphics::CreateInterface()
     ddim.y = dim.y*0.5f;
     pc = pw->CreateCheck(pos, ddim, -1, EVENT_INTERFACE_SHADOW_MAPPING_QUALITY);
     pc->SetState(STATE_SHADOW);
+    if (!m_engine->IsShadowMappingQualitySupported())
+    {
+        pes->ClearState(STATE_ENABLE);
+    }
 
     ddim.x = dim.x*2;
     ddim.y = dim.y*1;