/*
-----------------------------------------------------------------------------
Filename:    BasicTutorial3.h
-----------------------------------------------------------------------------
 
This source file is part of the
   ___                 __    __ _ _    _ 
  /___\__ _ _ __ ___  / / /\ \ (_) | _(_)
 //  // _` | '__/ _ \ \ \/  \/ / | |/ / |
/ \_// (_| | | |  __/  \  /\  /| |   <| |
\___/ \__, |_|  \___|   \/  \/ |_|_|\_\_|
      |___/                              
      Tutorial Framework
      http://www.ogre3d.org/tikiwiki/
-----------------------------------------------------------------------------
*/
#ifndef __BasicTutorial3_h_
#define __BasicTutorial3_h_
 
#include "BaseApplication.h"
 
#include <Terrain/OgreTerrain.h>
#include <Terrain/OgreTerrainGroup.h>
 
class BasicTutorial3 : public BaseApplication
{
private:
    Ogre::TerrainGlobalOptions* mTerrainGlobals;
    Ogre::TerrainGroup* mTerrainGroup;
    bool mTerrainsImported;
    OgreBites::Label* mInfoLabel;
 
    void defineTerrain(long x, long y);
    void initBlendMaps(Ogre::Terrain* terrain);
    void configureTerrainDefaults(Ogre::Light* light);
public:
    BasicTutorial3(void);
    virtual ~BasicTutorial3(void);
 
protected:
    virtual void createScene(void);
    virtual void createFrameListener(void);
    virtual void destroyScene(void);
    virtual bool frameRenderingQueued(const Ogre::FrameEvent& evt);
};
 
#endif // #ifndef __BasicTutorial3_h_

/*
-----------------------------------------------------------------------------
Filename:    BasicTutorial3.cpp
-----------------------------------------------------------------------------
 
This source file is part of the
   ___                 __    __ _ _    _ 
  /___\__ _ _ __ ___  / / /\ \ (_) | _(_)
 //  // _` | '__/ _ \ \ \/  \/ / | |/ / |
/ \_// (_| | | |  __/  \  /\  /| |   <| |
\___/ \__, |_|  \___|   \/  \/ |_|_|\_\_|
      |___/                              
      Tutorial Framework
      http://www.ogre3d.org/tikiwiki/
-----------------------------------------------------------------------------
*/
 
#include "BasicTutorial3.h"
 
//-------------------------------------------------------------------------------------
BasicTutorial3::BasicTutorial3(void)
    :   mTerrainGlobals(0),
    mTerrainGroup(0),
    mTerrainsImported(false),
    mInfoLabel(0)
{
}
//-------------------------------------------------------------------------------------
BasicTutorial3::~BasicTutorial3(void)
{
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::destroyScene(void)
{
    OGRE_DELETE mTerrainGroup;
    OGRE_DELETE mTerrainGlobals;
}
//-------------------------------------------------------------------------------------
void getTerrainImage(bool flipX, bool flipY, Ogre::Image& img)
{
    img.load("terrain.png", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
    if (flipX)
        img.flipAroundY();
    if (flipY)
        img.flipAroundX();
 
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::defineTerrain(long x, long y)
{
    Ogre::String filename = mTerrainGroup->generateFilename(x, y);
    if (Ogre::ResourceGroupManager::getSingleton().resourceExists(mTerrainGroup->getResourceGroup(), filename))
    {
        mTerrainGroup->defineTerrain(x, y);
    }
    else
    {
        Ogre::Image img;
        getTerrainImage(x % 2 != 0, y % 2 != 0, img);
        mTerrainGroup->defineTerrain(x, y, &img);
        mTerrainsImported = true;
    }
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::initBlendMaps(Ogre::Terrain* terrain)
{
    Ogre::TerrainLayerBlendMap* blendMap0 = terrain->getLayerBlendMap(1);
    Ogre::TerrainLayerBlendMap* blendMap1 = terrain->getLayerBlendMap(2);
    Ogre::Real minHeight0 = 70;
    Ogre::Real fadeDist0 = 40;
    Ogre::Real minHeight1 = 70;
    Ogre::Real fadeDist1 = 15;
    float* pBlend1 = blendMap1->getBlendPointer();
    for (Ogre::uint16 y = 0; y < terrain->getLayerBlendMapSize(); ++y)
    {
        for (Ogre::uint16 x = 0; x < terrain->getLayerBlendMapSize(); ++x)
        {
            Ogre::Real tx, ty;
 
            blendMap0->convertImageToTerrainSpace(x, y, &tx, &ty);
            Ogre::Real height = terrain->getHeightAtTerrainPosition(tx, ty);
            Ogre::Real val = (height - minHeight0) / fadeDist0;
            val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
 
            val = (height - minHeight1) / fadeDist1;
            val = Ogre::Math::Clamp(val, (Ogre::Real)0, (Ogre::Real)1);
            *pBlend1++ = val;
        }
    }
    blendMap0->dirty();
    blendMap1->dirty();
    blendMap0->update();
    blendMap1->update();
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::configureTerrainDefaults(Ogre::Light* light)
{
    // Configure global
    mTerrainGlobals->setMaxPixelError(8);
    // testing composite map
    mTerrainGlobals->setCompositeMapDistance(3000);
 
    // Important to set these so that the terrain knows what to use for derived (non-realtime) data
    mTerrainGlobals->setLightMapDirection(light->getDerivedDirection());
    mTerrainGlobals->setCompositeMapAmbient(mSceneMgr->getAmbientLight());
    mTerrainGlobals->setCompositeMapDiffuse(light->getDiffuseColour());
 
    // Configure default import settings for if we use imported image
    Ogre::Terrain::ImportData& defaultimp = mTerrainGroup->getDefaultImportSettings();
    defaultimp.terrainSize = 513;
    defaultimp.worldSize = 12000.0f;
    defaultimp.inputScale = 600;
    defaultimp.minBatchSize = 33;
    defaultimp.maxBatchSize = 65;
    // textures
    defaultimp.layerList.resize(3);
    defaultimp.layerList[0].worldSize = 100;
    defaultimp.layerList[0].textureNames.push_back("dirt_grayrocky_diffusespecular.dds");
    defaultimp.layerList[0].textureNames.push_back("dirt_grayrocky_normalheight.dds");
    defaultimp.layerList[1].worldSize = 30;
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_diffusespecular.dds");
    defaultimp.layerList[1].textureNames.push_back("grass_green-01_normalheight.dds");
    defaultimp.layerList[2].worldSize = 200;
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_diffusespecular.dds");
    defaultimp.layerList[2].textureNames.push_back("growth_weirdfungus-03_normalheight.dds");
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::createScene(void)
{
    mCamera->setPosition(Ogre::Vector3(1683, 50, 2116));
    mCamera->lookAt(Ogre::Vector3(1963, 50, 1660));
    mCamera->setNearClipDistance(0.1);
    mCamera->setFarClipDistance(50000);
 
    if (mRoot->getRenderSystem()->getCapabilities()->hasCapability(Ogre::RSC_INFINITE_FAR_PLANE))
    {
        mCamera->setFarClipDistance(0);   // enable infinite far clip distance if we can
    }
 
// Play with startup Texture Filtering options
// Note: Pressing T on runtime will discarde those settings
//  Ogre::MaterialManager::getSingleton().setDefaultTextureFiltering(Ogre::TFO_ANISOTROPIC);
//  Ogre::MaterialManager::getSingleton().setDefaultAnisotropy(7);
 
    Ogre::Vector3 lightdir(0.55, -0.3, 0.75);
    lightdir.normalise();
 
    Ogre::Light* light = mSceneMgr->createLight("tstLight");
    light->setType(Ogre::Light::LT_DIRECTIONAL);
    light->setDirection(lightdir);
    light->setDiffuseColour(Ogre::ColourValue::White);
    light->setSpecularColour(Ogre::ColourValue(0.4, 0.4, 0.4));
 
    mSceneMgr->setAmbientLight(Ogre::ColourValue(0.2, 0.2, 0.2));
 
    mTerrainGlobals = OGRE_NEW Ogre::TerrainGlobalOptions();
 
    mTerrainGroup = OGRE_NEW Ogre::TerrainGroup(mSceneMgr, Ogre::Terrain::ALIGN_X_Z, 513, 12000.0f);
    mTerrainGroup->setFilenameConvention(Ogre::String("BasicTutorial3Terrain"), Ogre::String("dat"));
    mTerrainGroup->setOrigin(Ogre::Vector3::ZERO);
 
    configureTerrainDefaults(light);
 
    for (long x = 0; x <= 0; ++x)
        for (long y = 0; y <= 0; ++y)
            defineTerrain(x, y);
 
    // sync load since we want everything in place when we start
    mTerrainGroup->loadAllTerrains(true);
 
    if (mTerrainsImported)
    {
        Ogre::TerrainGroup::TerrainIterator ti = mTerrainGroup->getTerrainIterator();
        while(ti.hasMoreElements())
        {
            Ogre::Terrain* t = ti.getNext()->instance;
            initBlendMaps(t);
        }
    }
 
    mTerrainGroup->freeTemporaryResources();
 
    Ogre::ColourValue fadeColour(0.9, 0.9, 0.9);
    mSceneMgr->setFog(Ogre::FOG_LINEAR, fadeColour, 0.0, 10, 1200);
    mWindow->getViewport(0)->setBackgroundColour(fadeColour);
 
    Ogre::Plane plane;
    plane.d = 100;
    plane.normal = Ogre::Vector3::NEGATIVE_UNIT_Y;
 
    //mSceneMgr->setSkyDome(true, "Examples/CloudySky", 5, 8, 500);
    mSceneMgr->setSkyPlane(true, plane, "Examples/CloudySky", 500, 20, true, 0.5, 150, 150);
}
//-------------------------------------------------------------------------------------
void BasicTutorial3::createFrameListener(void)
{
    BaseApplication::createFrameListener();
 
    mInfoLabel = mTrayMgr->createLabel(OgreBites::TL_TOP, "TInfo", "", 350);
}
//-------------------------------------------------------------------------------------
bool BasicTutorial3::frameRenderingQueued(const Ogre::FrameEvent& evt)
{
    bool ret = BaseApplication::frameRenderingQueued(evt);
 
    if (mTerrainGroup->isDerivedDataUpdateInProgress())
    {
        mTrayMgr->moveWidgetToTray(mInfoLabel, OgreBites::TL_TOP, 0);
        mInfoLabel->show();
        if (mTerrainsImported)
        {
            mInfoLabel->setCaption("Building terrain, please wait...");
        }
        else
        {
            mInfoLabel->setCaption("Updating textures, patience...");
        }
    }
    else
    {
        mTrayMgr->removeWidgetFromTray(mInfoLabel);
        mInfoLabel->hide();
        if (mTerrainsImported)
        {
            mTerrainGroup->saveAllTerrains(true);
            mTerrainsImported = false;
        }
    }
 
    return ret;
}
 
 
 
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#define WIN32_LEAN_AND_MEAN
#include "windows.h"
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
    INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
#else
    int main(int argc, char *argv[])
#endif
    {
        // Create application object
        BasicTutorial3 app;
 
        try {
            app.go();
        } catch( Ogre::Exception& e ) {
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
            MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);
#else
            std::cerr << "An exception has occured: " <<
                e.getFullDescription().c_str() << std::endl;
#endif
        }
 
        return 0;
    }
 
#ifdef __cplusplus
}
#endif