Fix transparency sorting

components/nifogre/ogrenifloader.cpp

@@ -755,7 +755,8 @@ static Ogre::String getMaterial(const Nif::NiTriShape *shape, const Ogre::String
         instance->setProperty("alpha_rejection", sh::makeProperty(new sh::StringValue(reject)));
     }
 
-    instance->setProperty("transparent_sorting", sh::makeProperty(new sh::StringValue(!((alphaFlags>>13)&1) ? "on" : "off")));
+    // Ogre usually only sorts if depth write is disabled, so we want "force" instead of "on"
+    instance->setProperty("transparent_sorting", sh::makeProperty(new sh::StringValue(!((alphaFlags>>13)&1) ? "force" : "off")));
 
     instance->setProperty("depth_check", sh::makeProperty(new sh::StringValue((depthFlags&1) ? "on" : "off")));
     instance->setProperty("depth_write", sh::makeProperty(new sh::StringValue(((depthFlags>>1)&1) ? "on" : "off")));

extern/shiny/Platforms/Ogre/OgreMaterialSerializer.cpp

@@ -1,5 +1,7 @@
 #include "OgreMaterialSerializer.hpp"
 
+#include <OgrePass.h>
+
 namespace sh
 {
 	void OgreMaterialSerializer::reset()
@@ -19,6 +21,13 @@ namespace sh
 
 	bool OgreMaterialSerializer::setPassProperty (const std::string& param, std::string value, Ogre::Pass* pass)
 	{
+		// workaround https://ogre3d.atlassian.net/browse/OGRE-158
+		if (param == "transparent_sorting" && value == "force")
+		{
+			pass->setTransparentSortingForced(true);
+			return true;
+		}
+
 		reset();
 
 		mScriptContext.section = Ogre::MSS_PASS;

extern/shiny/Platforms/Ogre/OgrePass.cpp

@@ -50,13 +50,6 @@ namespace sh
 			return true; // handled already
 		else if (name == "fragment_program")
 			return true; // handled already
-		else if (name == "ffp_vertex_colour_ambient")
-		{
-			bool enabled = retrieveValue<BooleanValue>(value, context).get();
-			// fixed-function vertex colour tracking
-			mPass->setVertexColourTracking(enabled ? Ogre::TVC_AMBIENT : Ogre::TVC_NONE);
-			return true;
-		}
 		else
 		{
 			OgreMaterialSerializer& s = OgrePlatform::getSerializer();

files/materials/objects.mat

@@ -11,6 +11,7 @@ material openmw_objects_base
     scene_blend default
     depth_write default
     alpha_rejection default
+    transparent_sorting default
 
     pass
     {
@@ -30,6 +31,7 @@ material openmw_objects_base
         scene_blend $scene_blend
         alpha_rejection $alpha_rejection
         depth_write $depth_write
+        transparent_sorting $transparent_sorting
 
         texture_unit diffuseMap
         {