/*=========================================================================

  Program:   Visualization Toolkit

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * @class   vtkSurfaceLICHelper
 *
 * A small collection of noise routines for LIC
*/

#ifndef vtkSurfaceLICHelper_h
#define vtkSurfaceLICHelper_h

#include "vtkRenderingLICOpenGL2Module.h" // for export
#include "vtkPixelExtent.h"
#include "vtkWeakPointer.h"
#include "vtkSmartPointer.h"
#include "vtkOpenGLHelper.h"
#include "vtk_glew.h"
#include "vtkTextureObject.h"

#include <deque> // for methods

class vtkOpenGLFramebufferObject;
class vtkOpenGLRenderWindow;
class vtkPainterCommunicator;
class vtkImageData;
class vtkSurfaceLICComposite;
class vtkLineIntegralConvolution2D;
class vtkRenderer;
class vtkActor;
class vtkDataObject;

class vtkSurfaceLICHelper
{
public:
  vtkSurfaceLICHelper();
  ~vtkSurfaceLICHelper();

  /**
   * Check for OpenGL support
   */
  static bool IsSupported(vtkOpenGLRenderWindow *context);

  /**
   * Free textures and shader programs we're holding a reference to.
   */
  void ReleaseGraphicsResources(vtkWindow *win);

  /**
   * Free textures we're holding a reference to.
   */
  void ClearTextures();

  /**
   * Allocate textures.
   */
  void AllocateTextures(
        vtkOpenGLRenderWindow *context,
        int *viewsize);

  /**
   * Allocate a size texture, store in the given smart pointer.
   */
  void AllocateTexture(
        vtkOpenGLRenderWindow *context,
        int *viewsize,
        vtkSmartPointer<vtkTextureObject> &tex,
        int filter = vtkTextureObject::Nearest);

  /**
   * Allocate a size texture, store in the given smart pointer.
   */
  void AllocateDepthTexture(
        vtkOpenGLRenderWindow *context,
        int *viewsize,
        vtkSmartPointer<vtkTextureObject> &tex);

  /**
   * After LIC has been computed reset/clean internal state
   */
  void Updated();

  /**
   * Force all stages to re-execute. Necessary if the
   * context or communicator changes.
   */
  void UpdateAll();

  //@{
  /**
   * Convert viewport to texture coordinates
   */
  void ViewportQuadTextureCoords(GLfloat *tcoords)
  {
    tcoords[0] = tcoords[2] = 0.0f;
    tcoords[1] = tcoords[3] = 1.0f;
  }
  //@}

  /**
   * Convert a viewport to a bounding box and it's texture coordinates for a
   * screen size texture.
   */
  void ViewportQuadPoints(const vtkPixelExtent &viewportExt, GLfloat *quadpts)
  {
    viewportExt.GetData(quadpts);
  }

  /**
   * Convert a viewport to a bounding box and it's texture coordinates for a
   * screen size texture.
   */
  void ViewportQuadTextureCoords(
        const vtkPixelExtent &viewExt,
        const vtkPixelExtent &viewportExt,
        GLfloat *tcoords);

  //@{
  /**
   * Convert the entire view to a bounding box and it's texture coordinates for
   * a screen size texture.
   */
  void ViewQuadPoints(GLfloat *quadpts)
  {
    quadpts[0] = quadpts[2] = 0.0f;
    quadpts[1] = quadpts[3] = 1.0f;
  }
  //@}

  //@{
  /**
   * Convert the entire view to a bounding box and it's texture coordinates for
   * a screen size texture.
   */
  void ViewQuadTextureCoords(GLfloat *tcoords)
  {
    tcoords[0] = tcoords[2] = 0.0f;
    tcoords[1] = tcoords[3] = 1.0f;
  }
  //@}

  /**
   * Render a quad (to trigger a shader to run)
   */
  void RenderQuad(
        const vtkPixelExtent &viewExt,
        const vtkPixelExtent &viewportExt,
        vtkOpenGLHelper *cbo);

  /**
   * Compute the index into the 4x4 OpenGL ordered matrix.
   */
  inline int idx(int row, int col) { return 4*col+row; }

  /**
   * given a axes aligned bounding box in
   * normalized device coordinates test for
   * view frustum visibility.
   * if all points are outside one of the
   * view frustum planes then this box
   * is not visible. we might have false
   * positive where more than one clip
   * plane intersects the box.
   */
  bool VisibilityTest(double ndcBBox[24]);

  /**
   * Given world space bounds,
   * compute bounding boxes in clip and normalized device
   * coordinates and perform view frustum visiblity test.
   * return true if the bounds are visible. If so the passed
   * in extent object is initialized with the corresponding
   * screen space extents.
   */
  bool ProjectBounds(
          double PMV[16],
          int viewsize[2],
          double bounds[6],
          vtkPixelExtent &screenExt);

  /**
   * Compute screen space extents for each block in the input
   * dataset and for the entire dataset. Only visible blocks
   * are used in the computations.
   */
  int ProjectBounds(
        vtkRenderer *ren,
        vtkActor *actor,
        vtkDataObject *dobj,
        int viewsize[2],
        vtkPixelExtent &dataExt,
        std::deque<vtkPixelExtent> &blockExts);

  /**
   * Shrink an extent to tightly bound non-zero values
   */
  void GetPixelBounds(float *rgba, int ni, vtkPixelExtent &ext);

  /**
   * Shrink a set of extents to tightly bound non-zero values
   * cull extent if it's empty
   */
  void GetPixelBounds(float *rgba, int ni, std::deque<vtkPixelExtent> &blockExts);

  static void StreamingFindMinMax(
    vtkOpenGLFramebufferObject *fbo,
    std::deque<vtkPixelExtent> &blockExts,
    float &min, float &max);

  vtkSmartPointer<vtkImageData> Noise;
  vtkSmartPointer<vtkTextureObject> NoiseImage;
  vtkSmartPointer<vtkTextureObject> DepthImage;
  vtkSmartPointer<vtkTextureObject> GeometryImage;
  vtkSmartPointer<vtkTextureObject> VectorImage;
  vtkSmartPointer<vtkTextureObject> CompositeVectorImage;
  vtkSmartPointer<vtkTextureObject> MaskVectorImage;
  vtkSmartPointer<vtkTextureObject> CompositeMaskVectorImage;
  vtkSmartPointer<vtkTextureObject> LICImage;
  vtkSmartPointer<vtkTextureObject> RGBColorImage;
  vtkSmartPointer<vtkTextureObject> HSLColorImage;

  bool HasVectors;
  std::deque<vtkPixelExtent> BlockExts;

  vtkOpenGLHelper *ColorEnhancePass;
  vtkOpenGLHelper *CopyPass;
  vtkOpenGLHelper *ColorPass;

  int Viewsize[2];
  vtkSmartPointer<vtkSurfaceLICComposite> Compositor;
  vtkSmartPointer<vtkOpenGLFramebufferObject> FBO;

  vtkSmartPointer<vtkLineIntegralConvolution2D> LICer;
  vtkPainterCommunicator *Communicator;
  vtkPixelExtent DataSetExt;

  vtkWeakPointer<vtkOpenGLRenderWindow> Context;

  bool ContextNeedsUpdate;
  bool CommunicatorNeedsUpdate;


protected:

};

#endif
// VTK-HeaderTest-Exclude: vtkSurfaceLICHelper.h