#include "glInterface.h"
#include "GlobalLinesRenderer.h"
#include "common.h"

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

#include <QtOpenGL>

namespace GtpVisibilityPreprocessor {

static CGcontext sCgContext = NULL;
static CGprogram sCgDepthPeelingProgram = NULL;
static CGprofile sCgFragmentProfile;


static void handleCgError() 
{
    cerr << "Cg error: " << cgGetErrorString(cgGetError()) << endl;
    exit(1);
}


GlobalLinesRenderer::GlobalLinesRenderer(QGLPixelBuffer *buffer1, QGLPixelBuffer *buffer2):
mNewBuffer(buffer1), mOldBuffer(buffer2)
{
}


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

 
void GlobalLinesRenderer::CastGlobalLines(Beam &beam, const int samples)
{
	// bind pixel shader implementing the front depth buffer functionality
	cgGLBindProgram(sCgDepthPeelingProgram);
	cgGLEnableProfile(sCgFragmentProfile);

	ApplyDepthPeeling(beam, samples);
}


void GlobalLinesRenderer::DrawGeometry()
{
}

void GlobalLinesRenderer::ApplyDepthPeeling(Beam &beam, const int samples)
{
/*	if (rtNew->IsDoubleBuffered()) 
		glDrawBuffer(GL_BACK);
	
	rtNew->BeginCapture();
	{
		cgGLBindProgram(passthru);
		glColor3f(0,0.0,0.0);
		DrawGeometry();   //just random geomerty   
	}
	rtNew->EndCapture();

	for(int l = 0; l < mCurrentDepth; l++) 
	{
		// Peel another layer
		pingpong(); // switch pointer between rendertextures
     
		rtNew->BeginCapture();
		{
			if (rtNew->IsDoubleBuffered()) 
				glDrawBuffer(GL_BACK);
        
			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);         
			
			cgGLBindProgram(fragmentProgram);
			cgGLSetTextureParameter(input1, rtOld->GetDepthTextureID());
			cgGLEnableTextureParameter(input1);

            glColor3f(0,0.0,0.0);
			DrawGeometry();
			cgGLDisableTextureParameter(input1);
		}
		rtNew->EndCapture();
   }*/
}


}