Eigene Dateien/Vis/src/VSliceRenderer.cpp

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#include "VSliceRenderer.h"
#include "glew.h"
#include "VFramebufferObject.h"

VSliceRenderer::VSliceRenderer() : m_ActiveSlice(ALL), m_active_saggital(1), m_active_corronal(1),
m_active_transversal(1), m_ProgramLoaded(false), m_TransferFunctionHandle(0), m_tf_activated(0)
{
        m_Volume = NULL;
}


VSliceRenderer::VSliceRenderer(VVolume * volume) : m_ActiveSlice(ALL), m_active_saggital(1),
m_active_corronal(1), m_active_transversal(1), m_ProgramLoaded(false), m_TransferFunctionHandle(0)
{
        m_Volume = volume;
}

void VSliceRenderer::draw()
{
        switch (m_ActiveSlice)
        {
        case SAGGITAL:
                this->drawSaggitalSlice();
                break;
        case CORRONAL:
                this->drawCorronalSlice();
                break;
        case TRANSVERSAL:
                this->drawTransversalSlice();
                break;
        case ALL:
                this->drawAllSlices();
                break;
        }
}

void VSliceRenderer::processInput(guiInput input)
{
        /*this->m_ActiveSlice = input.m_ActiveSlice;
        this->m_CorSliceNumber = input.m_CorronalSlice;
        this->m_SagSliceNumber = input.m_SaggitalSlice;
        this->m_TransSliceNumber = input.m_TransversalSlice;*/
}

void VSliceRenderer::drawAllSlices()
{
        glActiveTextureARB(GL_TEXTURE0_ARB);
        glEnable(GL_TEXTURE_3D);
        glBindTexture(GL_TEXTURE_3D, m_Volume->getGLVolumeHandle());

        
        if (m_tf_activated)
        {
                
                glActiveTextureARB(GL_TEXTURE1_ARB);
                glEnable(GL_TEXTURE_2D);
                glBindTexture(GL_TEXTURE_2D, m_TransferFunctionHandle);
                
                m_Program_with_tf.bind();
                glUniform1i(m_Program_with_tf.getUniformLocation("mVolume"),0);
                glUniform1i(m_Program_with_tf.getUniformLocation("mTransfer"),1);
        }
        else
        {
                m_Program_without_tf.bind();
                glUniform1i(m_Program_without_tf.getUniformLocation("mVolume"),0);
        }
        

        

        const GLenum glError = glGetError();

        if (glError != GL_NO_ERROR)
                std::cout << "Error in draw " << gluErrorString(glError) << std::endl;

        glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

        //draw small corronal in lower left corner
        glBegin(GL_QUADS);

        float minx = 0.0f;
        float miny = 0.0f;
        float maxx = 0.0f;
        float maxy = 0.0f;

        float fw = 662.0f / (float)m_Width;
        float fh = 662.0f / (float)m_Height;

        float w0, h0;
        float aspect = ((float)m_Volume->getDimX()/(float)m_Volume->getDimZ());

        if(aspect < 1.0f)
        {
                h0 = 0.5f;
                w0 = 0.5f * aspect;
        }
        else
        {
                w0 = 0.5f;
                h0 = 0.5f / aspect;
        }

        //float aspect = ((float)m_Volume->getDimX()/(float)m_Volume->getDimZ());

        //if(windowaspect > 1.0f)
        //{
        //      higher width -> modify x
        //      minx += (1.0f - (1.0f/windowaspect))/2.0f;
        //      maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        //}
        //else if (windowaspect < 1.0f)
        //{
        //      higher height -> modify y
        //      miny += (1.0f - (windowaspect/1.0f))/2.0f;
        //      maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        //}

        //xsize = abs(minx) + abs(maxx);
        //ysize = abs(miny) + abs(maxy);

        //if(aspect > 1.0f)
        //{
        //      in y richtung drücken
        //      in x richtung auf 1.0 bringen

        //      miny /= aspect;
        //      maxy /= aspect;
        //      
        //      if(windowaspect >= 1.0f)
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny /= xsize/2.0f;
        //              maxy /= xsize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny *= ysize/2.0f;
        //              maxy *= ysize/2.0f;
        //      }
        //      

        //      if((miny < -1.0f) && (maxy > 1.0f))
        //      {
        //              float smax = maxy;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}
        //else if(aspect < 1.0f)
        //{
        //      in x richtung drücken
        //      in y richtung auf 1.0 bringen
        //      minx *= aspect;
        //      maxx *= aspect;

        //      if(windowaspect >= 1.0f)
        //      {
        //              minx *= xsize/2.0f;
        //              maxx *= xsize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= ysize/2.0f;
        //              maxx /= ysize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }

        //      if((minx < -1.0f) && (maxx > 1.0f))
        //      {
        //              float smax = maxx;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}

        if (fw > fh)
        {
                h0 /= fw;
                h0 *= fh;

        }else
        {
                w0 /= fh;
                w0 *= fw;
        }

        minx = -0.5f - w0;
        maxx = -0.5f + w0;
        miny = -0.5f - h0;
        maxy = -0.5f + h0;
        


        //glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        glTexCoord3f(0.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 0.0f);
        glVertex3f(minx, miny, 0.0f);

        //glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        glTexCoord3f(0.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 1.0f);
        glVertex3f(minx, maxy, 0.0f);

        //glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        glTexCoord3f(1.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 1.0f);
        glVertex3f(maxx, maxy, 0.0f);

        //glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        glTexCoord3f(1.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 0.0f);
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        //draw small saggital in upper left corner
        glBegin(GL_QUADS);
        
        
        aspect = ((float)m_Volume->getDimY()/(float)m_Volume->getDimZ());
        if(aspect < 1.0f)
        {
                h0 = 0.5f;
                w0 = 0.5f * aspect;
        }
        else
        {
                w0 = 0.5f;
                h0 = 0.5f / aspect;
        }

        //float aspect = ((float)m_Volume->getDimX()/(float)m_Volume->getDimZ());

        //if(windowaspect > 1.0f)
        //{
        //      higher width -> modify x
        //      minx += (1.0f - (1.0f/windowaspect))/2.0f;
        //      maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        //}
        //else if (windowaspect < 1.0f)
        //{
        //      higher height -> modify y
        //      miny += (1.0f - (windowaspect/1.0f))/2.0f;
        //      maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        //}

        //xsize = abs(minx) + abs(maxx);
        //ysize = abs(miny) + abs(maxy);

        //if(aspect > 1.0f)
        //{
        //      in y richtung drücken
        //      in x richtung auf 1.0 bringen

        //      miny /= aspect;
        //      maxy /= aspect;
        //      
        //      if(windowaspect >= 1.0f)
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny /= xsize/2.0f;
        //              maxy /= xsize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny *= ysize/2.0f;
        //              maxy *= ysize/2.0f;
        //      }
        //      

        //      if((miny < -1.0f) && (maxy > 1.0f))
        //      {
        //              float smax = maxy;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}
        //else if(aspect < 1.0f)
        //{
        //      in x richtung drücken
        //      in y richtung auf 1.0 bringen
        //      minx *= aspect;
        //      maxx *= aspect;

        //      if(windowaspect >= 1.0f)
        //      {
        //              minx *= xsize/2.0f;
        //              maxx *= xsize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= ysize/2.0f;
        //              maxx /= ysize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }

        //      if((minx < -1.0f) && (maxx > 1.0f))
        //      {
        //              float smax = maxx;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}

        if (fw > fh)
        {
                h0 /= fw;
                h0 *= fh;

        }else
        {
                w0 /= fh;
                w0 *= fw;
        }

        minx = -0.5f - w0; 
        maxx = -0.5f + w0; 
        miny =  0.5f - h0; 
        maxy =  0.5f + h0; 
        
        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 0.0f, 0.0f);
        glVertex3f(minx, miny, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 0.0f, 1.0f);
        glVertex3f(minx, maxy, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 1.0f, 1.0f);
        glVertex3f(maxx, maxy, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 1.0f, 0.0f);
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        //draw small transversal in upper right corner

        glBegin(GL_QUADS);
        aspect = ((float)m_Volume->getDimY()/(float)m_Volume->getDimX());

        if(aspect < 1.0f)
        {
                h0 = 0.5f;
                w0 = 0.5f * aspect;
        }
        else
        {
                w0 = 0.5f;
                h0 = 0.5f / aspect;
        }

        //float aspect = ((float)m_Volume->getDimX()/(float)m_Volume->getDimZ());

        //if(windowaspect > 1.0f)
        //{
        //      higher width -> modify x
        //      minx += (1.0f - (1.0f/windowaspect))/2.0f;
        //      maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        //}
        //else if (windowaspect < 1.0f)
        //{
        //      higher height -> modify y
        //      miny += (1.0f - (windowaspect/1.0f))/2.0f;
        //      maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        //}

        //xsize = abs(minx) + abs(maxx);
        //ysize = abs(miny) + abs(maxy);

        //if(aspect > 1.0f)
        //{
        //      in y richtung drücken
        //      in x richtung auf 1.0 bringen

        //      miny /= aspect;
        //      maxy /= aspect;
        //      
        //      if(windowaspect >= 1.0f)
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny /= xsize/2.0f;
        //              maxy /= xsize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= xsize/2.0f;
        //              maxx /= xsize/2.0f;

        //              miny *= ysize/2.0f;
        //              maxy *= ysize/2.0f;
        //      }
        //      

        //      if((miny < -1.0f) && (maxy > 1.0f))
        //      {
        //              float smax = maxy;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}
        //else if(aspect < 1.0f)
        //{
        //      in x richtung drücken
        //      in y richtung auf 1.0 bringen
        //      minx *= aspect;
        //      maxx *= aspect;

        //      if(windowaspect >= 1.0f)
        //      {
        //              minx *= xsize/2.0f;
        //              maxx *= xsize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }
        //      else
        //      {
        //              minx /= ysize/2.0f;
        //              maxx /= ysize/2.0f;

        //              miny /= ysize/2.0f;
        //              maxy /= ysize/2.0f;
        //      }

        //      if((minx < -1.0f) && (maxx > 1.0f))
        //      {
        //              float smax = maxx;

        //              minx /= smax;
        //              miny /= smax;

        //              maxx /= smax;
        //              maxy /= smax;
        //      }
        //}

        if (fw > fh)
        {
                h0 /= fw;
                h0 *= fh;

        }else
        {
                w0 /= fh;
                w0 *= fw;
        }

        minx = 0.5f - w0; 
        maxx = 0.5f + w0; 
        miny = 0.5f - h0; 
        maxy = 0.5f + h0; 

        glTexCoord3f(0.0f, 0.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(minx, miny, 0.0f);

        glTexCoord3f(0.0f, 1.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(minx, maxy, 0.0f);

        glTexCoord3f(1.0f, 1.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(maxx, maxy, 0.0f);

        glTexCoord3f(1.0f, 0.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        if(m_tf_activated)
        {
                m_Program_with_tf.release();

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glBindTexture(GL_TEXTURE_2D, 0);
                glDisable(GL_TEXTURE_2D);
        }
        else
        {
                m_Program_without_tf.release();
        }
        
        
        glActiveTextureARB(GL_TEXTURE0_ARB);
        glBindTexture(GL_TEXTURE_3D, 0);
        glDisable(GL_TEXTURE_3D);
        
        glBegin(GL_LINES);
        glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
        glVertex3f(0.0f, 1.0f, -1.0f);
        
        glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
        glVertex3f(0.0f, -1.0f, -1.0f);

        glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
        glVertex3f(1.0f, 0.0f, -1.0f);
        
        glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
        glVertex3f(-1.0f, 0.0f, -1.0f);
        glEnd();
}

void VSliceRenderer::drawCorronalSlice()
{
        glActiveTextureARB(GL_TEXTURE0_ARB);
        glEnable(GL_TEXTURE_3D);
        glBindTexture(GL_TEXTURE_3D, m_Volume->getGLVolumeHandle());


        if (m_tf_activated)
        {

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glEnable(GL_TEXTURE_2D);
                glBindTexture(GL_TEXTURE_2D, m_TransferFunctionHandle);

                m_Program_with_tf.bind();
                glUniform1i(m_Program_with_tf.getUniformLocation("mVolume"),0);
                glUniform1i(m_Program_with_tf.getUniformLocation("mTransfer"),1);
        }
        else
        {
                m_Program_without_tf.bind();
                glUniform1i(m_Program_without_tf.getUniformLocation("mVolume"),0);
        }

        float windowaspect = (float)m_Width / (float) m_Height;

        float minx = -1.0f;
        float miny = -1.0f;
        float maxx =  1.0f;
        float maxy =  1.0f;
        float xsize;
        float ysize;

        float aspect = ((float)m_Volume->getDimX()/(float)m_Volume->getDimZ());


        if(windowaspect > 1.0f)
        {
                //higher width -> modify x
                minx += (1.0f - (1.0f/windowaspect))/2.0f;
                maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        }
        else if (windowaspect < 1.0f)
        {
                //higher height -> modify y
                miny += (1.0f - (windowaspect/1.0f))/2.0f;
                maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        }

        xsize = abs(minx) + abs(maxx);
        ysize = abs(miny) + abs(maxy);

        if(aspect > 1.0f)
        {
                //in y richtung drücken
                //in x richtung auf 1.0 bringen

                miny /= aspect;
                maxy /= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny /= xsize/2.0f;
                        maxy /= xsize/2.0f;
                }
                else
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny *= ysize/2.0f;
                        maxy *= ysize/2.0f;
                }


                if((miny < -1.0f) && (maxy > 1.0f))
                {
                        float smax = maxy;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }
        else if(aspect < 1.0f)
        {
                //in x richtung drücken
                //in y richtung auf 1.0 bringen
                minx *= aspect;
                maxx *= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx *= xsize/2.0f;
                        maxx *= xsize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }
                else
                {
                        minx /= ysize/2.0f;
                        maxx /= ysize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }

                if((minx < -1.0f) && (maxx > 1.0f))
                {
                        float smax = maxx;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }

        glBegin(GL_QUADS);
        glTexCoord3f(0.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 0.0f);
        glVertex3f(minx, miny, 0.0f);

        glTexCoord3f(0.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 1.0f);
        glVertex3f(minx, maxy, 0.0f);

        glTexCoord3f(1.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 1.0f);
        glVertex3f(maxx, maxy, 0.0f);

        glTexCoord3f(1.0f, (float)(m_active_corronal - 1)/(float)m_Volume->getDimY(), 0.0f);
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        if(m_tf_activated)
        {
                m_Program_with_tf.release();

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glBindTexture(GL_TEXTURE_2D, 0);
                glDisable(GL_TEXTURE_2D);
        }
        else
        {
                m_Program_without_tf.release();
        }


        glActiveTextureARB(GL_TEXTURE0_ARB);
        glBindTexture(GL_TEXTURE_3D, 0);
        glDisable(GL_TEXTURE_3D);
}

void VSliceRenderer::drawSaggitalSlice()
{
        glActiveTextureARB(GL_TEXTURE0_ARB);
        glEnable(GL_TEXTURE_3D);
        glBindTexture(GL_TEXTURE_3D, m_Volume->getGLVolumeHandle());


        if (m_tf_activated)
        {

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glEnable(GL_TEXTURE_2D);
                glBindTexture(GL_TEXTURE_2D, m_TransferFunctionHandle);

                m_Program_with_tf.bind();
                glUniform1i(m_Program_with_tf.getUniformLocation("mVolume"),0);
                glUniform1i(m_Program_with_tf.getUniformLocation("mTransfer"),1);
        }
        else
        {
                m_Program_without_tf.bind();
                glUniform1i(m_Program_without_tf.getUniformLocation("mVolume"),0);
        }

        float windowaspect = (float)m_Width / (float) m_Height;

        float aspect = ((float)m_Volume->getDimY()/(float)m_Volume->getDimZ());
        float minx = -1.0f;
        float miny = -1.0f;
        float maxx =  1.0f;
        float maxy =  1.0f;
        float xsize;
        float ysize;

        if(windowaspect > 1.0f)
        {
                //higher width -> modify x
                minx += (1.0f - (1.0f/windowaspect))/2.0f;
                maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        }
        else if (windowaspect < 1.0f)
        {
                //higher height -> modify y
                miny += (1.0f - (windowaspect/1.0f))/2.0f;
                maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        }

        xsize = abs(minx) + abs(maxx);
        ysize = abs(miny) + abs(maxy);

        if(aspect > 1.0f)
        {
                //in y richtung drücken
                //in x richtung auf 1.0 bringen

                miny /= aspect;
                maxy /= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny /= xsize/2.0f;
                        maxy /= xsize/2.0f;
                }
                else
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny *= ysize/2.0f;
                        maxy *= ysize/2.0f;
                }


                if((miny < -1.0f) && (maxy > 1.0f))
                {
                        float smax = maxy;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }
        else if(aspect < 1.0f)
        {
                //in x richtung drücken
                //in y richtung auf 1.0 bringen
                minx *= aspect;
                maxx *= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx *= xsize/2.0f;
                        maxx *= xsize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }
                else
                {
                        minx /= ysize/2.0f;
                        maxx /= ysize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }

                if((minx < -1.0f) && (maxx > 1.0f))
                {
                        float smax = maxx;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }

        glBegin(GL_QUADS);
        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 0.0f, 0.0f);
        glVertex3f(minx, miny, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 0.0f, 1.0f);
        glVertex3f(minx, maxy, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 1.0f, 1.0f);
        glVertex3f(maxx, maxy, 0.0f);

        glTexCoord3f((float)(m_active_saggital-1)/(float)m_Volume->getDimX(), 1.0f, 0.0f);
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        if(m_tf_activated)
        {
                m_Program_with_tf.release();

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glBindTexture(GL_TEXTURE_2D, 0);
                glDisable(GL_TEXTURE_2D);
        }
        else
        {
                m_Program_without_tf.release();
        }


        glActiveTextureARB(GL_TEXTURE0_ARB);
        glBindTexture(GL_TEXTURE_3D, 0);
        glDisable(GL_TEXTURE_3D);
}

void VSliceRenderer::drawTransversalSlice()
{
        glActiveTextureARB(GL_TEXTURE0_ARB);
        glEnable(GL_TEXTURE_3D);
        glBindTexture(GL_TEXTURE_3D, m_Volume->getGLVolumeHandle());


        if (m_tf_activated)
        {

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glEnable(GL_TEXTURE_2D);
                glBindTexture(GL_TEXTURE_2D, m_TransferFunctionHandle);

                m_Program_with_tf.bind();
                glUniform1i(m_Program_with_tf.getUniformLocation("mVolume"),0);
                glUniform1i(m_Program_with_tf.getUniformLocation("mTransfer"),1);
        }
        else
        {
                m_Program_without_tf.bind();
                glUniform1i(m_Program_without_tf.getUniformLocation("mVolume"),0);
        }

        float windowaspect = (float)m_Width / (float) m_Height;


        float aspect = ((float)m_Volume->getDimY()/(float)m_Volume->getDimX());
        float minx = -1.0f;
        float miny = -1.0f;
        float maxx =  1.0f;
        float maxy =  1.0f;
        float xsize;
        float ysize;

        if(windowaspect > 1.0f)
        {
                //higher width -> modify x
                minx += (1.0f - (1.0f/windowaspect))/2.0f;
                maxx -= (1.0f - (1.0f/windowaspect))/2.0f;
        }
        else if (windowaspect < 1.0f)
        {
                //higher height -> modify y
                miny += (1.0f - (windowaspect/1.0f))/2.0f;
                maxy -= (1.0f - (windowaspect/1.0f))/2.0f;
        }

        xsize = abs(minx) + abs(maxx);
        ysize = abs(miny) + abs(maxy);

        if(aspect > 1.0f)
        {
                //in y richtung drücken
                //in x richtung auf 1.0 bringen

                miny /= aspect;
                maxy /= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny /= xsize/2.0f;
                        maxy /= xsize/2.0f;
                }
                else
                {
                        minx /= xsize/2.0f;
                        maxx /= xsize/2.0f;

                        miny *= ysize/2.0f;
                        maxy *= ysize/2.0f;
                }


                if((miny < -1.0f) && (maxy > 1.0f))
                {
                        float smax = maxy;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }
        else if(aspect < 1.0f)
        {
                //in x richtung drücken
                //in y richtung auf 1.0 bringen
                minx *= aspect;
                maxx *= aspect;

                if(windowaspect >= 1.0f)
                {
                        minx *= xsize/2.0f;
                        maxx *= xsize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }
                else
                {
                        minx /= ysize/2.0f;
                        maxx /= ysize/2.0f;

                        miny /= ysize/2.0f;
                        maxy /= ysize/2.0f;
                }

                if((minx < -1.0f) && (maxx > 1.0f))
                {
                        float smax = maxx;

                        minx /= smax;
                        miny /= smax;

                        maxx /= smax;
                        maxy /= smax;
                }
        }

        glBegin(GL_QUADS);
        glTexCoord3f(0.0f, 0.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(minx, miny, 0.0f);

        glTexCoord3f(0.0f, 1.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(minx, maxy, 0.0f);

        glTexCoord3f(1.0f, 1.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(maxx, maxy, 0.0f);

        glTexCoord3f(1.0f, 0.0f, (float)(m_active_transversal-1)/(float)m_Volume->getDimZ());
        glVertex3f(maxx, miny, 0.0f);
        glEnd();

        if(m_tf_activated)
        {
                m_Program_with_tf.release();

                glActiveTextureARB(GL_TEXTURE1_ARB);
                glBindTexture(GL_TEXTURE_2D, 0);
                glDisable(GL_TEXTURE_2D);
        }
        else
        {
                m_Program_without_tf.release();
        }


        glActiveTextureARB(GL_TEXTURE0_ARB);
        glBindTexture(GL_TEXTURE_3D, 0);
        glDisable(GL_TEXTURE_3D);
}

---