#include "glInterface.h"
#include "GlobalLinesRenderer.h"
#include "common.h"
#include "RenderTexture.h"
#include "Preprocessor.h"
#include "GlRenderer.h"
#include "Exporter.h"

// the devil library
#include <IL/il.h>
#include <IL/ilu.h>
#include <IL/ilut.h>

#include <Cg/cg.h>
#include <Cg/cgGL.h>

//#include <QtOpenGL>

namespace GtpVisibilityPreprocessor {


static CGcontext sCgContext = NULL;
static CGprogram sCgDepthPeelingProgram = NULL;
static CGprogram sCgPassThroughProgram = NULL;

static CGprofile sCgFragmentProfile;
static CGparameter sTextureParam;

GlobalLinesRenderer *globalLinesRenderer = NULL;

static int texWidth = 256;
static int texHeight = 256;

static bool isDepth = true;

static void InitDevIl()
{
	ilInit();
	ILuint ImageName;
	ilGenImages(1, &ImageName);
	ilBindImage(ImageName);
	ilEnable(IL_FILE_OVERWRITE);

	//  ilRegisterFormat(IL_RGBA);
	//  ilRegisterType(IL_FLOAT);

	//  ilEnable(IL_ORIGIN_SET);
	//  ilOriginFunc(IL_ORIGIN_UPPER_LEFT);
}


static void cgErrorCallback()
{
	CGerror lastError = cgGetError();

	if(lastError)
	{
		printf("%s\n\n", cgGetErrorString(lastError));
		printf("%s\n", cgGetLastListing(sCgContext));
		printf("Cg error, exiting...\n");

		exit(0);
	}
}

static void PrintGLerror(char *msg)
{
	GLenum errCode;
	const GLubyte *errStr;
	
	if ((errCode = glGetError()) != GL_NO_ERROR) 
	{
		errStr = gluErrorString(errCode);
		fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
	}
}


void Reshape(int w, int h)
{
	if (h == 0) h = 1;

	glViewport(0, 0, w, h);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	//gluPerspective(60.0, (GLfloat)w/(GLfloat)h, 3, 5000.0);
	//gluPerspective(60.0, (GLfloat)w/(GLfloat)h, 0.5, 10.0);
	glOrtho(-1, 1, -1, 1, 0.5, 15);
}


void SetFrustum(const int sizeX, const int sizeY, 
				const float nearPlane, const float farPlane)
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glOrtho(-sizeX * 0.5, sizeX * 0.5, 
			-sizeY * 0.5, sizeY * 0.5, 
			nearPlane, farPlane);

	/*glOrtho(0, sizeX, 
		    0, sizeY , 
			nearPlane, farPlane);*/
}

void Display()
{
	//globalLinesRenderer->DrawGeometry();
	//globalLinesRenderer->CastGlobalLines(Beam(), 0);
	globalLinesRenderer->DisplayBuffer(isDepth);
	PrintGLerror("display");

	glutSwapBuffers();
}


void Idle()
{
	glutPostRedisplay();
}


void Keyboard(unsigned char key, int x, int y)
{
	switch(key)
	{
	case '2':
		{
			VssRayContainer rays;

			++ globalLinesRenderer->mMaxDepth;
			globalLinesRenderer->ApplyDepthPeeling(rays, Beam(), 0);

			cout << "max depth: " << globalLinesRenderer->mMaxDepth << endl;
			CLEAR_CONTAINER(rays);
			return;
		}
	case '1':
		{
			VssRayContainer rays;

			-- globalLinesRenderer->mMaxDepth;
			cout << "max depth: " << globalLinesRenderer->mMaxDepth << endl;
			
			globalLinesRenderer->ApplyDepthPeeling(rays, Beam(), 0);
			CLEAR_CONTAINER(rays);
			return;
		}
	case '3':
		{
			//globalLinesRenderer->ApplyDepthPeeling(Beam(), 0);
			globalLinesRenderer->ExportDepthBuffer();
			
			return;
		}
	case '4':
		{
			//globalLinesRenderer->ApplyDepthPeeling(Beam(), 0);
			globalLinesRenderer->ExportItemBuffer();
			
			return;
		}
	case '8':
		{
			isDepth = !isDepth;
			return;
		}
	case '9':
		{
			VssRayContainer rays;
			globalLinesRenderer->ApplyDepthPeeling(rays, Beam(), 0);
			VssRayContainer outRays;
			VssRayContainer::const_iterator vit, vit_end = rays.end();

			const float p = 8.0f / (float)rays.size();

			for (vit = rays.begin(); vit != vit_end; ++ vit)
			{
				if (Random(1.0f) < p)
				{
					outRays.push_back(*vit);
				}
			}

			globalLinesRenderer->Visualize(rays);
			CLEAR_CONTAINER(rays);
			return;
		}
	case '0':
		{
			VssRayContainer rays;
			globalLinesRenderer->ApplyDepthPeeling(rays, Beam(), 0);
			CLEAR_CONTAINER(rays);
			return;
		}
	default:
		return;
	}
}


/*GlobalLinesRenderer::GlobalLinesRenderer(RenderTexture *buffer1, 
										 RenderTexture *buffer2, 
										 Preprocessor *preprocessor,
										 GlRenderer *renderer)
: mNewTexture(buffer1), mOldTexture(buffer2), mPreprocessor(preprocessor), mMaxDepth(100),
mRenderer(renderer)
{
}
*/


GlobalLinesRenderer::GlobalLinesRenderer(Preprocessor *preprocessor, 
										 GlRenderer *renderer): 
mNewTexture(NULL), 
mOldTexture(NULL), 
mMaxDepth(0), 
mRenderer(renderer), 
mPreprocessor(preprocessor)
{
}


void GlobalLinesRenderer::DisplayBuffer(const bool isDepth)
{
	if (!isDepth)
		mNewTexture->Bind();
	else
		mNewTexture->BindDepth();
	mNewTexture->EnableTextureTarget();
	
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	if (mNewTexture->IsRectangleTexture())
	{
		glBegin(GL_QUADS);
		glTexCoord2f(0, 0); glVertex3f(-1, -1, -0.5f);
		glTexCoord2f(mNewTexture->GetWidth(), 0); glVertex3f( 1, -1, -0.5f);
		glTexCoord2f(mNewTexture->GetWidth(), mNewTexture->GetHeight()); glVertex3f( 1,  1, -0.5f);
		glTexCoord2f(0, mNewTexture->GetHeight()); glVertex3f(-1, 1, -0.5f);
		glEnd();
	}
	else
	{
		glBegin(GL_QUADS);
		glTexCoord2f(0, 0); glVertex3f(-1, -1, -0.5f);
		glTexCoord2f(1, 0); glVertex3f( 1, -1, -0.5f);
		glTexCoord2f(1, 1); glVertex3f( 1,  1, -0.5f);
		glTexCoord2f(0, 1); glVertex3f(-1,  1, -0.5f);
		glEnd();
	}  

	mNewTexture->DisableTextureTarget();
	PrintGLerror("displaytexture");
}


GlobalLinesRenderer::~GlobalLinesRenderer()
{
	if (sCgDepthPeelingProgram)
		cgDestroyProgram(sCgDepthPeelingProgram);
	if (sCgContext)
		cgDestroyContext(sCgContext);

	// init the receiving buffers
	delete mNewDepthBuffer;
	delete mOldDepthBuffer;
	
	delete mNewItemBuffer;
	delete mOldItemBuffer;
}

 
void GlobalLinesRenderer::CastGlobalLines(Beam &beam, const int samples)
{
	VssRayContainer rays;

	// bind pixel shader implementing the front depth buffer functionality
	ApplyDepthPeeling(rays, beam, samples);
}


void GlobalLinesRenderer::RenderObject(Intersectable *obj)
{
	mRenderer->RenderIntersectable(obj);
}


void GlobalLinesRenderer::DrawGeometry()
{ 
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glMatrixMode(GL_MODELVIEW);

	glPushMatrix();
	{ 
		//glLoadIdentity();
		ObjectContainer::const_iterator oit, oit_end = mPreprocessor->mObjects.end();

		Intersectable::NewMail();

		for (oit = mPreprocessor->mObjects.begin(); oit != oit_end; ++ oit)
		{
			cout << (*oit)->GetId() << " ";
			RenderObject(*oit);
		}
	}
	glPopMatrix();
}


void GlobalLinesRenderer::SwitchRenderTextures()
{
	RenderTexture *buffer = mOldTexture;
	mOldTexture = mNewTexture;
	mNewTexture = buffer;
}


void GlobalLinesRenderer::ComputeLookAt(const float alpha, 
										const float beta,
										Vector3 &eye, 
										Vector3 &up, 
										Vector3 left)
{
	//float x = cos(alpha);
	//float y = sin(alpha);
	eye.x = sin(alpha) * cos(beta);
	eye.y = sin(alpha) * sin(beta);
	eye.z = cos(beta);

	eye.RightHandedBase(up, left);
}


void GlobalLinesRenderer::InitGl()
{
	InitDevIl();

    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
	glutInitWindowPosition(50, 50);
	glutInitWindowSize(512, 512);
	glutCreateWindow("TestRenderDepthTexture");  

	int err = glewInit();
	if (GLEW_OK != err)
	{
		// problem: glewInit failed, something is seriously wrong
		fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(err));
		exit(-1);
	}  
	
	glutKeyboardFunc(Keyboard);
	glutDisplayFunc(Display);
	glutIdleFunc(Idle);
	glutReshapeFunc(Reshape);

	Reshape(512, 512);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	// initialise the receiving buffers
	mNewDepthBuffer = new float[texWidth * texHeight];
	mNewItemBuffer = new unsigned char[texWidth * texHeight * 4];

	mOldDepthBuffer = new float[texWidth * texHeight];
    mOldItemBuffer = new unsigned char[texWidth * texHeight * 4];

	for (int i = 0; i < texWidth * texHeight; ++ i)
	{
		mNewDepthBuffer[i] = 1;
		mOldDepthBuffer[i] = 1;

		mNewItemBuffer[i * 4]     = 255;
		mNewItemBuffer[i * 4 + 1] = 255;
		mNewItemBuffer[i * 4 + 2] = 255;
		mNewItemBuffer[i * 4 + 3] = 255;

		mOldItemBuffer[i * 4]     = 255;
		mOldItemBuffer[i * 4 + 1] = 255;
		mOldItemBuffer[i * 4 + 2] = 255;
		mOldItemBuffer[i * 4 + 3] = 255;
	}

	AxisAlignedBox3 bbox = globalLinesRenderer->mPreprocessor->mKdTree->GetBox();
	
	Vector3 midPoint = bbox.Center();
	
	const float sceneSize = Magnitude(bbox.Diagonal());
	mViewPoint = midPoint + Vector3(0.5 * sceneSize, 0, 0);
	
	cout << "mid point: " << midPoint << endl;
	cout << "view point: " << mViewPoint << endl;
	cout << "scene: " << bbox << endl;

	mNear = 1;
	mFar = sceneSize;
	mWidth = sceneSize;

	mEyeVec = Normalize(midPoint - mViewPoint);
	mEyeVec.RightHandedBase(mUpVec, mLeftVec);

	/*gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z, 
			  midPoint.x, midPoint.y, midPoint.z, 
			  0, 1, 0);
*/
	gluLookAt(0, 0, 3, 0, 0, 0, 0, 1, 0);

	//glDisable(GL_CULL_FACE);
	glEnable(GL_CULL_FACE);
	glDisable(GL_LIGHTING);
	glDisable(GL_COLOR_MATERIAL);
	glEnable(GL_DEPTH_TEST); 
	glClearColor(0.1, 0.2, 0.3, 1);
	
	// A square, mipmapped, anisotropically filtered 8-bit RGBA texture with
	// depth and stencil.
	// Note that RT_COPY_TO_TEXTURE is required for depth textures on ATI hardware
	
	mNewTexture = new RenderTexture(texWidth, texHeight, true, true);
	//mNewTexture->Initialize(true, true, false, true, true, 8, 8, 8, 8);//, RenderTexture::RT_COPY_TO_TEXTURE);
	mNewTexture->Initialize(true, true, false, true, true, 8, 8, 8, 8, RenderTexture::RT_COPY_TO_TEXTURE);
	
	mOldTexture = new RenderTexture(texWidth, texHeight, true, true);
	//mOldTexture ->Initialize(true, true, false, true, true, 8, 8, 8, 8);//, RenderTexture::RT_COPY_TO_TEXTURE);
	mOldTexture ->Initialize(true, true, false, true, true, 8, 8, 8, 8, RenderTexture::RT_COPY_TO_TEXTURE);

	// Setup Cg
	cgSetErrorCallback(cgErrorCallback);

	// Create cgContext.
	sCgContext = cgCreateContext();

	// get the best profile for this hardware
	sCgFragmentProfile = cgGLGetLatestProfile(CG_GL_FRAGMENT);
	
	//assert(sCgFragmentProfile != CG_PROFILE_UNKNOWN);
	cgGLSetOptimalOptions(sCgFragmentProfile);

	sCgDepthPeelingProgram = 
		cgCreateProgramFromFile(sCgContext, 
								CG_SOURCE,
								mNewTexture->IsRectangleTexture() ? 
								"../src/depth_peelingRect.cg" : "../src/depth_peeling2d.cg", 
								GLEW_ARB_fragment_program ? CG_PROFILE_ARBFP1 : CG_PROFILE_FP30,
								NULL,
								NULL);

	if(sCgDepthPeelingProgram != NULL)
	{
		cgGLLoadProgram(sCgDepthPeelingProgram);
		sTextureParam = cgGetNamedParameter(sCgDepthPeelingProgram, "depthTex");  
	}

	sCgPassThroughProgram = 
		cgCreateProgramFromFile(sCgContext, 
								CG_SOURCE,
								"../src/passthrough.cg", 
								GLEW_ARB_fragment_program ? CG_PROFILE_ARBFP1 : CG_PROFILE_FP30,
								NULL,
								NULL);

	if(sCgPassThroughProgram != NULL)
	{
		cgGLLoadProgram(sCgPassThroughProgram);
	}

    // setup the rendering context for the RenderTexture
	mNewTexture->BeginCapture();
	{
		//Reshape(texWidth, texHeight);
		glViewport(0, 0, texWidth, texHeight);
		SetFrustum(mWidth, mWidth, mNear, mFar);

		// for item buffer: white means no color
		glClearColor(1, 1, 1, 1);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		glFrontFace(GL_CCW);
		glCullFace(GL_BACK);

		glDisable(GL_CULL_FACE);
		//glEnable(GL_CULL_FACE);

		glShadeModel(GL_FLAT);
		glEnable(GL_DEPTH_TEST);
		
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z, 
				  midPoint.x, midPoint.y, midPoint.z, 
				  0, 1, 0);

	}
	mNewTexture->EndCapture();

	// setup the rendering context for the other depth buffer
	mOldTexture->BeginCapture();
	{
		// for item buffer: white means no color
		glClearColor(1, 1, 1, 1);
       
		//Reshape(texWidth, texHeight);
		glViewport(0, 0, texWidth, texHeight);
		SetFrustum(mWidth, mWidth, mNear, mFar);

		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		
		glFrontFace(GL_CCW);
		glCullFace(GL_BACK);
		
		glDisable(GL_CULL_FACE);
		//glEnable(GL_CULL_FACE);
		
		glShadeModel(GL_FLAT);
		glEnable(GL_DEPTH_TEST);
		
		gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z, 
				  midPoint.x, midPoint.y, midPoint.z, 
				  0, 1, 0);

		//SetFrustum(sceneSize, sceneSize, 1, sceneSize);
	}
	mOldTexture->EndCapture();

	PrintGLerror("init");
}


Intersectable *GlobalLinesRenderer::ExtractSamplePoint(float *depthBuffer,
													   unsigned char *itemBuffer,
													   const int x, 
													   const int y,
													   Vector3 &hitPoint,
													   const bool isFrontBuffer) const
{
	const int depthIndex = x + texWidth * y;
	const int itemIndex = 4 * depthIndex;

	const float depth = depthBuffer[depthIndex];
	const float eyeDist = mNear + (mFar - mNear) * depth;
	
	const float leftDist = 0.5f * mWidth - mWidth * ((float)x + 0.5f) / texWidth;
	//const float upDist = 0.5f * mWidth - (float)mWidth * ((float)y + 0.5f) / texHeight;
	const float upDist = -0.5f * mWidth + mWidth * ((float)y + 0.5f) / texHeight;
	
	hitPoint = mViewPoint + 
		       eyeDist * mEyeVec + 
			   leftDist * mUpVec + 
			   upDist * mLeftVec;
				
	unsigned char r = itemBuffer[itemIndex];
	unsigned char g = itemBuffer[itemIndex + 1];
	unsigned char b = itemBuffer[itemIndex + 2];
			
	// 3 times 255 means no valid object
	if ((r == 255) && (g == 255) && (b == 255))
		return NULL;

	const int id = mRenderer->GetId(r, g, b);
	//cout << "r: " << (int)r << "g: " << (int)g << " b: " << (int)b << " id: " << id << "|";
	Intersectable *intersect = mPreprocessor->GetObjectById(id);

	const Vector3 dir = isFrontBuffer ? mEyeVec : -mEyeVec;
	// HACK: assume triangle intersectable
	const Vector3 norm = intersect->GetNormal(0); 

	// test for invalid view space
	if (DotProd(dir, norm) >= -Limits::Small) 
		return NULL;

	return intersect;
}


void GlobalLinesRenderer::ProcessDepthBuffer(VssRayContainer &vssRays, 
											 const bool oldBufferInitialised)
{
	GrabDepthBuffer(mNewDepthBuffer, mNewTexture);
	GrabItemBuffer(mNewItemBuffer, mNewTexture);

	if (oldBufferInitialised)
	{
		GrabDepthBuffer(mOldDepthBuffer, mOldTexture);
		GrabItemBuffer(mOldItemBuffer, mOldTexture);
	}
	else
	{
		for (int i = 0; i < texWidth * texHeight; ++ i)
		{
			mOldDepthBuffer[i] = 0;

			mOldItemBuffer[i * 4]     = 255;
			mOldItemBuffer[i * 4 + 1] = 255;
			mOldItemBuffer[i * 4 + 2] = 255;
			mOldItemBuffer[i * 4 + 3] = 255;
		}
	}

	cout << "vp: " << "eye: " << mEyeVec << " left: " << mLeftVec << " up: " << mUpVec << endl;

	for (int y = 0; y < texHeight; ++ y)
	{
		for (int x = 0; x < texWidth; ++ x)
		{
			Vector3 newPt, oldPt;

			Intersectable *termObj1 = ExtractSamplePoint(mNewDepthBuffer, 
														 mNewItemBuffer, 
														 x, 
														 y, 
														 newPt, 
														 true);

			Intersectable *termObj2 = ExtractSamplePoint(mOldDepthBuffer, 
														 mOldItemBuffer, 
														 x, 
														 y, 
														 oldPt, 
														 false);

			// create rays in both directions
			if (termObj1)
			{
				vssRays.push_back(new VssRay(oldPt, newPt, NULL, termObj1));
				//cout << "new pt: " << newPt << endl;
			}

			if (termObj2)
			{
				vssRays.push_back(new VssRay(newPt, oldPt, NULL, termObj2));
				//cout << "old pt: " << oldPt << endl;
			}
		}
	}
}


void GlobalLinesRenderer::Run()
{
	glutMainLoop();
}


void SetupFalseColor(const unsigned int id, 
					 unsigned char &r,
					 unsigned char &g,
					 unsigned char &b
					 )
{
	// swap bits of the color
	r = id & 255;
	g = (id >> 8) & 255;
	b = (id >> 16) & 255;
}


void GlobalLinesRenderer::Visualize(const VssRayContainer &vssRays)
{
	Exporter *exporter = Exporter::GetExporter("globalLines.wrl");
	
	if (!exporter)
		return;

	exporter->SetWireframe();
	//exporter->ExportGeometry(preprocessor->mObjects);
	exporter->SetFilled();

	VssRayContainer::const_iterator vit, vit_end = vssRays.end();

	for (vit = vssRays.begin(); vit != vit_end; ++ vit)
	{
		VssRay *ray = *vit;
		Intersectable *obj = (*vit)->mTerminationObject;	
		exporter->ExportIntersectable(obj);
	}	

//	exporter->ExportRays(vssRays);

	delete exporter;
}


void GlobalLinesRenderer::GrabDepthBuffer(float *data, RenderTexture *rt)
{
	rt->BindDepth();
	rt->EnableTextureTarget();
	cout << "depth: " << mNewTexture->GetDepthBits() << endl;

	const int texFormat = GL_DEPTH_COMPONENT;
	glGetTexImage(mNewTexture->GetTextureTarget(), 0, texFormat, GL_FLOAT, data);

	mNewTexture->DisableTextureTarget();
}


void GlobalLinesRenderer::GrabItemBuffer(unsigned char *data, RenderTexture *rt)
{
	rt->Bind();
	rt->EnableTextureTarget();
	//cout << "depth: " << mNewTexture->GetDepthBits() << endl;

	const int texFormat = GL_RGBA;
	glGetTexImage(mNewTexture->GetTextureTarget(), 0, texFormat, GL_UNSIGNED_BYTE, data);

	mNewTexture->DisableTextureTarget();
}


void GlobalLinesRenderer::ExportDepthBuffer()
{
	mNewTexture->BindDepth();
	mNewTexture->EnableTextureTarget();
	cout << "depth: " << mNewTexture->GetDepthBits() << endl;

	const int components = 1;//mNewTexture->GetDepthBits() / 8;

	float *data = new float[texWidth * texHeight * components];
	//const int texFormat = WGL_TEXTURE_DEPTH_COMPONENT_NV;
	const int texFormat = GL_DEPTH_COMPONENT;
	//const int texFormat = GL_RGBA;
	glGetTexImage(mNewTexture->GetTextureTarget(), 0, texFormat, GL_FLOAT, data);

	/*for (int i = texWidth * 123; i < texWidth * 124; ++ i)
	{
		cout << data[i] << " ";
	}
	cout << "Saving image " << texWidth << " " << texHeight << endl;
*/
	string filename("depth.tga");
	ilRegisterType(IL_FLOAT);

	const int depth = 1;
	const int bpp = components;

	ilTexImage(texWidth, texHeight, depth, bpp, IL_LUMINANCE, IL_FLOAT, data);
	ilSaveImage((char *const)filename.c_str());

	cout << "finished" << endl;
	delete data;
	cout << "data deleted" << endl;
	mNewTexture->DisableTextureTarget();
	PrintGLerror("grab texture");
}

/*
void GlobalLinesRenderer::ExportItemBuffer()
{
	mNewTexture->Bind();
	mNewTexture->EnableTextureTarget();
	cout << "depth: " << mNewTexture->GetDepthBits() << endl;

	const int components = 4;//mNewTexture->GetDepthBits() / 8;

	float *data = new float[texWidth * texHeight * components*8];
	const int texFormat = GL_RGBA;
	glGetTexImage(mNewTexture->GetTextureTarget(), 0, texFormat, GL_FLOAT, data);

	string filename("items.tga");
	ilRegisterType(IL_FLOAT);

	const int depth = 1;
	const int bpp = components;

	cout << "saving items to file " << endl;

	ilTexImage(16, 16, depth, bpp, IL_RGBA, IL_FLOAT, data);
	ilSaveImage((char *const)filename.c_str());

	cout << "finished" << endl;
	delete data;
	cout << "data deleted" << endl;
	mNewTexture->DisableTextureTarget();
	PrintGLerror("grab texture");
}
*/
void GlobalLinesRenderer::ExportItemBuffer()
{
	mNewTexture->Bind();
	mNewTexture->EnableTextureTarget();
	cout << "depth: " << mNewTexture->GetDepthBits() << endl;

	const int components = 4;//mNewTexture->GetDepthBits() / 8;

	unsigned char *data = new unsigned char [texWidth * texHeight * components];
	//const int texFormat = WGL_TEXTURE_DEPTH_COMPONENT_NV;
	const int texFormat = GL_RGBA;
	glGetTexImage(mNewTexture->GetTextureTarget(), 0, texFormat, GL_UNSIGNED_BYTE, data);

	string filename("items.jpg");
	ilRegisterType(IL_UNSIGNED_BYTE);

	const int depth = 1;
	const int bpp = components;

	ilTexImage(texWidth, texHeight, depth, bpp, IL_RGBA, IL_UNSIGNED_BYTE, data);
	ilSaveImage((char *const)filename.c_str());

	cout << "finished" << endl;
	delete data;
	cout << "data deleted" << endl;
	mNewTexture->DisableTextureTarget();
	PrintGLerror("grab texture");
}


void GlobalLinesRenderer::ApplyDepthPeeling(VssRayContainer &rays,
											Beam &beam, 
											const int samples)
{
	mNewTexture->BeginCapture();
	{
		//cgGLBindProgram(sCgPassThroughProgram);
		//cgGLEnableProfile(sCgFragmentProfile);
		DrawGeometry();
	}
	mNewTexture->EndCapture();
	
	PrintGLerror("firstpass");
	if (mNewTexture->IsRectangleTexture()) cout << "rect" << endl;

	// process the buffers for the first layer
	ProcessDepthBuffer(rays, false);

	for(int i = 0; i < mMaxDepth; ++ i) 
	{
		// Peel another layer
		SwitchRenderTextures(); // switch pointer between rendertextures

		mNewTexture->BeginCapture();
		{
			//if (mNewTexture->IsDoubleBuffered()) 
			//	glDrawBuffer(GL_BACK);

			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);         

			cgGLBindProgram(sCgDepthPeelingProgram);
			cgGLEnableProfile(sCgFragmentProfile);
			cgGLSetTextureParameter(sTextureParam, mOldTexture->GetDepthTextureID());
			cgGLEnableTextureParameter(sTextureParam);

			//glutSolidTorus(0.25, 1, 32, 64);
			DrawGeometry();
			
			glPopMatrix();

			cgGLDisableTextureParameter(sTextureParam);
			cgGLDisableProfile(sCgFragmentProfile);
		}
		mNewTexture->EndCapture();

		// process the buffers for following layer
		ProcessDepthBuffer(rays, true);
	}

	PrintGLerror("endpeeling");
}


}