source: trunk/src/testing/app/volvis/vRenderer.h @ 4

/********************************************************************************
 * Volatile - Volume Visualization Software for SAGE
 * Copyright (C) 2004 Electronic Visualization Laboratory,
 * University of Illinois at Chicago
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the distribution.
 *  * Neither the name of the University of Illinois at Chicago nor
 *    the names of its contributors may be used to endorse or promote
 *    products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Direct questions, comments etc about Volatile to www.evl.uic.edu/cavern/forum
 *********************************************************************************/

#ifndef _VRENDERER_H
#define _VRENDERER_H
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "global.h"
#include "vVolume.h"
#include "vCut.h"
#include "vPrimitive.h"
#include "vSliceView.h"
#define depX 256
#define depY 256
class vRenderer :public vPrimitive
{
public:
        vRenderer();
        virtual ~vRenderer();
        //the volume to render
        void setVolume(vVolume* theVolume) {
                myVolume = theVolume;
        }

        void init();          //primitive call-back
        void draw();          //primitive call-back
        void update();          //update the variables here - called every loop
        int select() ;
        inline void enableCut() {
                cutEnabled = true;
        }

        inline void disableCut() {
                cutEnabled = false;
        }
        inline void enableShowOverview() {
                showOverview = true;
        }

        inline void disableShowOverview() {
                showOverview = false;
        }
        void prev();
        void next();

private:
        //loads the buffer to the texture mem
        void loadTexture3D(unsigned char *tex, int sx, int sy, int sz);
        //draw the bounding box
        void drawBoundBox();
        //draw the bounding box for the subvolume if any
        void drawSubvolBoundBox();
        //draws the 3 orthogonal slice views
        void drawSliceView();
        void renderAll();     //renders 3d texture, slice views, clip plane, bound box etc


        //generic slice allong axis volume renderer
        void renderTexture3D(float sampleFrequency,
                              GLdouble mv[16],  //Model View Matrix
                              float vo[8][3],     //volume vertex coords model-space coords
                              float tx[8][3],     //texture vertex coords tex-space coords
                              float axis[3]);     //axis to slice along world-space coords
        //to render one slice -called in the loop from renderTexture3D
        inline void renderSlice(int edges, float tc[6][3],float pc[6][3],int   order[6]);
        //does the intersection between a slice plane and the texture3D
        inline int intersect(const float p0[3], const float p1[3], //line end points
                     const float t0[3], const float t1[3], //texture points
                     const float v0[3], const float v1[3], //view coord points
                     const float sp[3], const float sn[3], //plane point & norm
                     float pnew[3], float tnew[3], float vnew[3]); //new values

        //Dependant texture related functions
        //loads a dependant texture(interactive or good) for CG to handle the map
        void loadDepTex(unsigned int deptexName, unsigned char *dtex);
        //takes the data from the 2d texture sent from the UI and copies it to the dependant texture(1D)
        //that will be passed to CG
        //For now, just extract the first row of the UI 2d texture to the dependant texture
        //scale the alpha values depending on the sample rate
        void copyScale(float sampleRate, unsigned char *cgTex);

        //---------------------member variables--------------
        vVolume*        myVolume; //pointer to the volume Im supposed to render
        vCut cut;                       //cutting plane
        vProbe volProbe;                //probe for the volume
        float xptr, yptr, zptr;         //location of the probe in the volume
        bool cutEnabled;        //whether cutplane is enabled
        bool showOverview; //show the subvolumes that are rendered
};

#endif