/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 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
LGPL like the rest of the engine.
-----------------------------------------------------------------------------
*/
/*
-----------------------------------------------------------------------------
Filename:    CelShading.cpp
Description: Demo of cel-shaded graphics using vertex & fragment programs
-----------------------------------------------------------------------------
*/


#include "ExampleApplication.h"

SceneNode* rotNode;

// Listener class for frame updates
class CelShadingListener : public ExampleFrameListener
{
protected:
public:
    CelShadingListener(RenderWindow* win, Camera* cam)
        : ExampleFrameListener(win, cam)
    {
    }

    bool frameRenderingQueued(const FrameEvent& evt)
    {
	if( ExampleFrameListener::frameRenderingQueued(evt) == false )
		return false;

        rotNode->yaw(Degree(evt.timeSinceLastFrame * 30));
        return true;
    }
};

// Custom parameter bindings
#define CUSTOM_SHININESS 1
#define CUSTOM_DIFFUSE 2
#define CUSTOM_SPECULAR 3

class CelShadingApplication : public ExampleApplication
{
public:
    CelShadingApplication() { 
    }

    ~CelShadingApplication() {  }

protected:
    
	void createFrameListener(void)
    {
		// This is where we instantiate our own frame listener
        mFrameListener= new CelShadingListener(mWindow, mCamera);
        mRoot->addFrameListener(mFrameListener);

    }
    

    // Just override the mandatory create scene method
    void createScene(void)
    {
        // Check capabilities
		const RenderSystemCapabilities* caps = Root::getSingleton().getRenderSystem()->getCapabilities();
        if (!caps->hasCapability(RSC_VERTEX_PROGRAM) || !(caps->hasCapability(RSC_FRAGMENT_PROGRAM)))
        {
			OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED, "Your card does not support vertex and fragment programs, so cannot "
                "run this demo. Sorry!", 
                "CelShading::createScene");
        }

        // Create a point light
        Light* l = mSceneMgr->createLight("MainLight");
        // Accept default settings: point light, white diffuse, just set position
        // Add light to the scene node
        rotNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();
        rotNode->createChildSceneNode(Vector3(20,40,50))->attachObject(l);

        Entity *ent = mSceneMgr->createEntity("head", "ogrehead.mesh");

        mCamera->setPosition(20, 0, 100);
        mCamera->lookAt(0,0,0);


        // Set common material, but define custom parameters to change colours
        // See Example-Advanced.material for how these are finally bound to GPU parameters
        SubEntity* sub;
        // eyes
        sub = ent->getSubEntity(0);
        sub->setMaterialName("Examples/CelShading");
        sub->setCustomParameter(CUSTOM_SHININESS, Vector4(35.0f, 0.0f, 0.0f, 0.0f));
        sub->setCustomParameter(CUSTOM_DIFFUSE, Vector4(1.0f, 0.3f, 0.3f, 1.0f));
        sub->setCustomParameter(CUSTOM_SPECULAR, Vector4(1.0f, 0.6f, 0.6f, 1.0f));
        // skin
        sub = ent->getSubEntity(1);
        sub->setMaterialName("Examples/CelShading");
        sub->setCustomParameter(CUSTOM_SHININESS, Vector4(10.0f, 0.0f, 0.0f, 0.0f));
        sub->setCustomParameter(CUSTOM_DIFFUSE, Vector4(0.0f, 0.5f, 0.0f, 1.0f));
        sub->setCustomParameter(CUSTOM_SPECULAR, Vector4(0.3f, 0.5f, 0.3f, 1.0f));
        // earring
        sub = ent->getSubEntity(2);
        sub->setMaterialName("Examples/CelShading");
        sub->setCustomParameter(CUSTOM_SHININESS, Vector4(25.0f, 0.0f, 0.0f, 0.0f));
        sub->setCustomParameter(CUSTOM_DIFFUSE, Vector4(1.0f, 1.0f, 0.0f, 1.0f));
        sub->setCustomParameter(CUSTOM_SPECULAR, Vector4(1.0f, 1.0f, 0.7f, 1.0f));
        // teeth
        sub = ent->getSubEntity(3);
        sub->setMaterialName("Examples/CelShading");
        sub->setCustomParameter(CUSTOM_SHININESS, Vector4(20.0f, 0.0f, 0.0f, 0.0f));
        sub->setCustomParameter(CUSTOM_DIFFUSE, Vector4(1.0f, 1.0f, 0.7f, 1.0f));
        sub->setCustomParameter(CUSTOM_SPECULAR, Vector4(1.0f, 1.0f, 1.0f, 1.0f));

        // Add entity to the root scene node
        mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(ent);

        mWindow->getViewport(0)->setBackgroundColour(ColourValue::White);
    }
};



#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
    CelShadingApplication app;

    try {
        app.go();
    } catch( 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();
#endif
    }


    return 0;
}

#ifdef __cplusplus
}
#endif
