source: nanovis/trunk/nanovis.h @ 4894

/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * ----------------------------------------------------------------------
 *  nanovis.h: package header
 *
 * ======================================================================
 *  AUTHOR:  Wei Qiao <qiaow@purdue.edu>
 *           Purdue Rendering and Perceptualization Lab (PURPL)
 *
 *  Copyright (c) 2004-2013  HUBzero Foundation, LLC
 *
 *  See the file "license.terms" for information on usage and
 *  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * ======================================================================
 */
#ifndef NV_NANOVIS_H
#define NV_NANOVIS_H

#include <cstddef> // For size_t
#include <string>
#include <tr1/unordered_map>

#include <tcl.h>

#include <GL/glew.h>

#include <vrmath/BBox.h>
#include <vrmath/Vector3f.h>

#include "config.h"
#include "Camera.h"
#include "FlowTypes.h"

//defines for the image based flow visualization
#define NMESH 256       //resolution of flow mesh
#define NPIX  512       //display size

namespace nv {
namespace graphics {
    class RenderContext;
}
namespace util {
    class Fonts;
}

class Flow;
class Grid;
class HeightMap;
class LIC;
class OrientationIndicator;
class PlaneRenderer;
class Texture2D;
class TransferFunction;
class VelocityArrowsSlice;
class Volume;
class VolumeRenderer;

class NanoVis
{
public:
    typedef std::string TransferFunctionId;
    typedef std::string VolumeId;
    typedef std::string FlowId;
    typedef std::string HeightMapId;
    typedef std::tr1::unordered_map<TransferFunctionId, TransferFunction *> TransferFunctionHashmap;
    typedef std::tr1::unordered_map<VolumeId, Volume *> VolumeHashmap;
    typedef std::tr1::unordered_map<FlowId, Flow *> FlowHashmap;
    typedef std::tr1::unordered_map<HeightMapId, HeightMap *> HeightMapHashmap;

    static bool init(const char *path);
    static bool initGL();
    static bool initOffscreenBuffer();
    static bool resizeOffscreenBuffer(int w, int h);
    static void setBgColor(float color[3]);
    static void render();
    static void update();
    static void removeAllData();

    static const Camera *getCamera()
    {
        return _camera;
    }
    static void panCamera(float dx, float dy);
    static void zoomCamera(float z);
    static void orientCamera(double *quat);
    static void setCameraPosition(vrmath::Vector3f pos);
    static void setCameraUpdir(Camera::AxisDirection dir);
    static void resetCamera(bool resetOrientation = false);

    static void eventuallyRedraw();
 
    static TransferFunction *getTransferFunction(const TransferFunctionId& id);
    static TransferFunction *defineTransferFunction(const TransferFunctionId& id, 
                                                    size_t n, float *data);

    static int renderLegend(TransferFunction *tf, double min, double max, 
                            int width, int height, const char *volArg);

    static Volume *loadVolume(const char *tag, int width, int height, int depth,
                              int numComponents, float *data, double vmin, double vmax, 
                              double nonZeroMin);

    static void removeVolume(Volume *volume);

    static void readScreen()
    {
        glPixelStorei(GL_PACK_ALIGNMENT, 1);
        glReadPixels(0, 0, winWidth, winHeight, GL_RGB, GL_UNSIGNED_BYTE, 
                     screenBuffer);
    }
    static void bindOffscreenBuffer()
    {
        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _finalFbo);
    }

    static void setVolumeRanges();
    static void setHeightmapRanges();
    static bool setFlowRanges();

    static Flow *getFlow(const char *name);
    static Flow *createFlow(Tcl_Interp *interp, const char *name);
    static void deleteFlows(Tcl_Interp *interp);
    static void deleteFlow(const char *name);

    static void renderFlows();
    static void resetFlows();
    static bool updateFlows();
    static void advectFlows();

    static Tcl_Interp *interp;

    static bool redrawPending;
    static bool debugFlag;

    static int winWidth;        ///< Width of the render window
    static int winHeight;       ///< Height of the render window
    static int renderWindow;    ///< GLUT handle for the render window
    static unsigned char *screenBuffer;
    static Texture2D *legendTexture;
    static util::Fonts *fonts;
    static graphics::RenderContext *renderContext;

    static TransferFunctionHashmap tfTable; ///< maps transfunc name to TransferFunction object
    static VolumeHashmap volumeTable;
    static FlowHashmap flowTable;
    static HeightMapHashmap heightMapTable;

    static vrmath::BBox sceneBounds;

    static VolumeRenderer *volRenderer;
    static VelocityArrowsSlice *velocityArrowsSlice;
    static LIC *licRenderer;
    static PlaneRenderer *planeRenderer;
    static OrientationIndicator *orientationIndicator;
    static Grid *grid;

private:
    static void collectBounds(bool onlyVisible = false);

    static Camera *_camera;

    //frame buffer for final rendering
    static GLuint _finalFbo, _finalColorTex, _finalDepthRb;
};

}

#endif