restore terrain in sample using LegacyTerrainLoader

Author: paroj

samples/include/CaelumDemo.h

@@ -4,6 +4,7 @@
 
 #include "CaelumDemoCommon.h"
 #include "ExampleApplication.h"
+#include "LegacyTerrainLoader.h"
 
 class CaelumSampleFrameListener : public OgreBites::InputListener
 {
@@ -119,8 +120,8 @@ class CaelumSampleApplication : public ExampleApplication
         // Start the camera on a hill in the middle of the terrain
         // looking towards Z+ (north).
         // Sun should rise in the east(left) and set in the west(right).
-        mCamera->setPosition (Vector3 (775, 100, 1997));
-        mCamera->lookAt (Vector3 (0, 0, 0));
+        mCamera->setPosition (Vector3 (775, 100, 997));
+        mCamera->lookAt (Vector3 (775, 99, 1000));
 
         mCamera->setNearClipDistance(5);
 
@@ -132,13 +133,13 @@ class CaelumSampleApplication : public ExampleApplication
 
     void createScene ()
     {
-        mSceneMgr->getRootSceneNode()->attachObject(
-                mSceneMgr->createEntity("House", "TudorHouse.mesh"));
-        // needs porting to new terrain system
-#if 0
+
+        SceneNode* houseNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();
+        houseNode->setPosition(Vector3 (775, 60, 1150));
+        houseNode->setScale(0.05, 0.05, 0.05);
+        houseNode->yaw(Degree(45));
+        houseNode->attachObject(mSceneMgr->createEntity("House", "TudorHouse.mesh"));
         // Put some terrain in the scene
-        std::string terrain_cfg("CaelumDemoTerrain.cfg");
-        mSceneMgr->setWorldGeometry (terrain_cfg);
-#endif
+        loadLegacyTerrain("CaelumDemoTerrain.cfg", mSceneMgr);
     }
 };

samples/include/LegacyTerrainLoader.h

@@ -0,0 +1,96 @@
+/*
+-----------------------------------------------------------------------------
+This source file is part of OGRE
+(Object-oriented Graphics Rendering Engine)
+For the latest info, see http://www.ogre3d.org/
+
+Copyright (c) 2000-2009 Torus Knot Software Ltd
+Also see acknowledgements in Readme.html
+
+You may use this sample code for anything you like, it is not covered by the
+same license as the rest of the engine.
+-----------------------------------------------------------------------------
+*/
+
+#include <OgreTerrain.h>
+#include <OgreTerrainGroup.h>
+#include <OgreConfigFile.h>
+
+namespace Ogre
+{
+class CustomMatProfile : public Ogre::TerrainMaterialGenerator::Profile
+{
+    MaterialPtr mMaterial;
+    bool mIsInit;
+    bool mNormalMapRequired;
+public:
+    CustomMatProfile(const String& matName) : Profile(NULL, "", ""), mIsInit(false), mNormalMapRequired(true)
+    {
+        auto terrainGlobals = TerrainGlobalOptions::getSingletonPtr();
+        mMaterial =
+            MaterialManager::getSingleton().getByName(matName, terrainGlobals->getDefaultResourceGroup());
+    }
+
+    bool isVertexCompressionSupported() const { return false; }
+
+    void setNormalMapRequired(bool enable) { mNormalMapRequired = enable; }
+
+    MaterialPtr generate(const Terrain* terrain)
+    {
+        if (!mIsInit && mNormalMapRequired)
+        {
+            // Get default pass
+            Pass *p = mMaterial->getTechnique(0)->getPass(0);	
+
+            // Add terrain's global normalmap to renderpass so the fragment program can find it.
+            p->createTextureUnitState()->_setTexturePtr(terrain->getTerrainNormalMap());
+
+        }
+        mIsInit = true;
+
+        return mMaterial;
+    }
+    MaterialPtr generateForCompositeMap(const Terrain* terrain)
+    {
+        return terrain->_getCompositeMapMaterial();
+    }
+    void updateCompositeMap(const Terrain* terrain, const Rect& rect) {}
+    void setLightmapEnabled(bool enabled) {}
+    uint8 getMaxLayers(const Terrain* terrain) const { return 0; }
+
+    void updateParams(const MaterialPtr& mat, const Terrain* terrain) {}
+    void updateParamsForCompositeMap(const MaterialPtr& mat, const Terrain* terrain) {}
+    void requestOptions(Terrain* terrain)
+    {
+        terrain->_setLightMapRequired(false);
+        terrain->_setCompositeMapRequired(false);
+        terrain->_setNormalMapRequired(mNormalMapRequired); 
+    }
+};
+} // namespace Ogre
+
+inline Ogre::TerrainGroup* loadLegacyTerrain(const Ogre::String& cfgFileName, Ogre::SceneManager* sceneMgr)
+{
+    using namespace Ogre;
+
+    ConfigFile cfg;
+    cfg.loadFromResourceSystem(cfgFileName, RGN_DEFAULT);
+
+    auto terrainGlobals = TerrainGlobalOptions::getSingletonPtr();
+    if(!terrainGlobals)
+        terrainGlobals = new TerrainGlobalOptions();
+
+    const String& customMatName = cfg.getSetting("CustomMaterialName");
+
+    if(!customMatName.empty())
+    {
+        auto profile = new CustomMatProfile(customMatName);
+        profile->setNormalMapRequired(StringConverter::parseBool(cfg.getSetting("VertexNormals")));
+        terrainGlobals->getDefaultMaterialGenerator()->setActiveProfile(profile);
+    }
+
+    auto terrainGroup = new TerrainGroup(sceneMgr);
+    terrainGroup->loadLegacyTerrain(cfgFileName);
+
+    return terrainGroup;
+}

samples/resources/CaelumSample.cg

@@ -144,6 +144,7 @@ void MainFP
     uniform sampler mainTexture : register(s0),
     #if TERRAIN
         uniform sampler detailTexture : register(s1),
+        uniform sampler normalTexture : register(s2),
     #endif
 #endif
 
@@ -203,18 +204,22 @@ void MainFP
     oColour += baseColour * derived_scene_colour;
 #endif
 
-#if ONE_LIGHT
-    float3 normal = normalize(iNormal);
+#if ONE_LIGHT || TWO_LIGHTS
+    #if TERRAIN
+        float3 normal = tex2D(normalTexture, iTexcoord).rgb * 2 - 1;
+    #else
+        float3 normal = normalize(iNormal);
+    #endif
+#endif
 
+#if ONE_LIGHT
     float diffuse_factor = max(0, dot(float4(normal, 1), light_position_view_space));
     float4 light_colour = diffuse_factor * derived_light_diffuse_colour * shadowing;
 
     oColour += baseColour * light_colour;
 #endif
 
 #if TWO_LIGHTS
-    float3 normal = normalize(iNormal);
-
     // Accumulate two lights
     float4 light_colour = float4(0, 0, 0, 0);