Render fog zones in Gothic 1

D3D11Engine/D3D11PFX_HeightFog.cpp

@@ -59,23 +59,35 @@ XRESULT D3D11PFX_HeightFog::Render( RenderToTextureBuffer* fxbuffer ) {
 	cb.HF_WeightZFar = std::min( cb.HF_WeightZFar, atmoMax );
 	cb.HF_WeightZNear = std::min( cb.HF_WeightZNear, atmoMin );
 
+#ifndef BUILD_GOTHIC_1_08k
+    float fogDensityFactor = 2;
+    float fogDensityFactorRain = (1.0f - Engine::GAPI->GetFogOverride());
+#else
+    float fogDensityFactor = pow( 15000.0f / Engine::GAPI->GetFarZ(), 4.0f );
+    float fogDensityFactorRain = 1.0f;
+#endif
+
 	if ( Engine::GAPI->GetFogOverride() > 0.0f ) {
 		// Make sure the camera is inside the fog when in fog zone
 		height = Toolbox::lerp( height, Engine::GAPI->GetCameraPosition().y + 10000, Engine::GAPI->GetFogOverride() ); // TODO: Get this from the actual fog-distance in the fogzone!
 
 		// Override fog color when in fog zone
 		color = Engine::GAPI->GetFogColor();
 
+#ifndef BUILD_GOTHIC_1_08k
 		// Make it z-Fog
 		cb.HF_HeightFalloff = Toolbox::lerp( cb.HF_HeightFalloff, 0.000001f, Engine::GAPI->GetFogOverride() );
+#endif
 
 		// Turn up density
-		cb.HF_GlobalDensity = Toolbox::lerp( cb.HF_GlobalDensity, cb.HF_GlobalDensity * 2, Engine::GAPI->GetFogOverride() );
+		cb.HF_GlobalDensity = Toolbox::lerp( cb.HF_GlobalDensity, cb.HF_GlobalDensity * fogDensityFactor, Engine::GAPI->GetFogOverride() );
 
+#ifndef BUILD_GOTHIC_1_08k
 		// Use other fog-values for fog-zones
 		float distNear = WORLD_SECTION_SIZE * ((ffar - fnear) / ffar);
 		cb.HF_WeightZNear = Toolbox::lerp( cb.HF_WeightZNear, WORLD_SECTION_SIZE * 0.09f, Engine::GAPI->GetFogOverride() );
 		cb.HF_WeightZFar = Toolbox::lerp( cb.HF_WeightZFar, WORLD_SECTION_SIZE * 0.8, Engine::GAPI->GetFogOverride() );
+#endif
 	}
 
 	//Engine::GAPI->GetRendererState().RendererSettings.FogColorMod;
@@ -94,7 +106,7 @@ XRESULT D3D11PFX_HeightFog::Render( RenderToTextureBuffer* fxbuffer ) {
 	XMStoreFloat3( &FogColorMod, XMVectorLerpV( color, XMLoadFloat3( &Engine::GAPI->GetRendererState().RendererSettings.RainFogColor ), XMVectorSet( std::min( 1.0f, rain * 2.0f ), std::min( 1.0f, rain * 2.0f ), std::min( 1.0f, rain * 2.0f ), 0 ) ) ); // Scale color faster here, so it looks better on light rain
 	cb.HF_FogColorMod = FogColorMod;
 	// Raining Density, only when not in fogzone
-	cb.HF_GlobalDensity = Toolbox::lerp( cb.HF_GlobalDensity, Engine::GAPI->GetRendererState().RendererSettings.RainFogDensity, rain * (1.0f - Engine::GAPI->GetFogOverride()) );
+	cb.HF_GlobalDensity = Toolbox::lerp( cb.HF_GlobalDensity, Engine::GAPI->GetRendererState().RendererSettings.RainFogDensity, rain * fogDensityFactorRain );
 
 
 	hfPS->GetConstantBuffer()[0]->UpdateBuffer( &cb );

D3D11Engine/GothicAPI.cpp

@@ -2720,6 +2720,12 @@ GInventory* GothicAPI::GetInventory() {
     return Inventory.get();
 }
 
+/** Returns the far Z */
+float GothicAPI::GetFarZ() {
+    zCSkyController_Outdoor* sc = oCGame::GetGame()->_zCSession_world->GetSkyControllerOutdoor();
+    return sc->GetFarZ();
+}
+
 /** Returns the fog-color */
 FXMVECTOR GothicAPI::GetFogColor() {
     zCSkyController_Outdoor* sc = oCGame::GetGame()->_zCSession_world->GetSkyControllerOutdoor();

D3D11Engine/GothicAPI.h

@@ -403,6 +403,9 @@ class GothicAPI {
     /** Returns the GSky-Object */
     GSky* GetSky() const;
 
+    /** Returns the far Z */
+    float GetFarZ();
+
     /** Returns the fog-color */
     FXMVECTOR GetFogColor();
 

D3D11Engine/GothicMemoryLocations1_08k.h

@@ -123,8 +123,8 @@ struct GothicMemoryLocations {
         static const unsigned int Init = 0x005E6A00;*/
 
         static const unsigned int GetUnderwaterFX = 0x5baaa0;
-        static const unsigned int Offset_OverrideColor = 0x558;
-        static const unsigned int Offset_OverrideFlag = 0x564;
+        static const unsigned int Offset_FarZ = 0x56C;
+        static const unsigned int Offset_Color = 0x580;
 
         static const unsigned int SetCameraLocationHint = 0x005BC7D0;
 

D3D11Engine/GothicMemoryLocations2_6_fix.h

@@ -191,6 +191,8 @@ struct GothicMemoryLocations {
         static const unsigned int Offset_SkyLayerState1 = 0x124;
         static const unsigned int Offset_OverrideColor = 0x558;
         static const unsigned int Offset_OverrideFlag = 0x564;
+        static const unsigned int Offset_FarZ = 0x580;
+        static const unsigned int Offset_Color = 0x594;
         static const unsigned int Interpolate = 0x005E8C20;
         static const unsigned int Offset_InitDone = 0x7C;
         static const unsigned int Init = 0x005E6A00;

D3D11Engine/zCSkyController_Outdoor.h

@@ -208,13 +208,22 @@ class zCSkyController_Outdoor : public zCSkyController {
 #ifndef BUILD_GOTHIC_1_08k
         return *reinterpret_cast<XMFLOAT3*>(THISPTR_OFFSET( GothicMemoryLocations::zCSkyController_Outdoor::Offset_OverrideColor ));
 #else
-        return XMFLOAT3( 0, 0, 0 );
+        zColor color = *reinterpret_cast<zColor*>THISPTR_OFFSET( GothicMemoryLocations::zCSkyController_Outdoor::Offset_Color );
+        return XMFLOAT3( color.bgra.r / 255.0f, color.bgra.g / 255.0f, color.bgra.b / 255.0f );
 #endif
     }
 
     bool GetOverrideFlag() {
 #ifndef BUILD_GOTHIC_1_08k
         return *reinterpret_cast<int*>(THISPTR_OFFSET( GothicMemoryLocations::zCSkyController_Outdoor::Offset_OverrideFlag )) != 0;
+#else
+        return 1;
+#endif
+    }
+
+    float GetFarZ() {
+#if defined(BUILD_GOTHIC_1_08k) || defined(BUILD_GOTHIC_2_6_fix)
+        return *reinterpret_cast<float*>THISPTR_OFFSET( GothicMemoryLocations::zCSkyController_Outdoor::Offset_FarZ );
 #else
         return 0;
 #endif