iquadric_shading.h

Go to the documentation of this file.

#ifndef _IQUADRIC_SHADING_H_
#define _IQUADRIC_SHADING_H_

// includes, maya
#include <maya/MPoint.h>
#include <maya/MPlug.h>
#include <maya/M3dView.h>

// includes, project
#include <imaya_helper.h>
#include <ishading.h>

// variables, exported

// declaration, forward
class IMaterial;


class IQuadricShading {

  friend class IQuadricUI;

public:

  IQuadricShading();

  ~IQuadricShading();

  void initCg();

  void initGL();

  inline void activate( M3dView & view, const MMatrix& quadric, const MPoint& ci) const;

  inline void deactivate() const;

  inline void activateFBO() const;

  inline void deactivateFBO() const;

  inline void setLightPosition( MPoint &lightPosition ) const;
  
  inline void setTransformedLightParameter( M3dView &view ) const;

private:

  // set shading parameter (called from activate)
  void setUniforms( M3dView& view, const MMatrix& q_matrix, const MPoint& ci) const;
  
  // get IMaterial
  IMaterial* getMaterial() const { return materialProperty; };

  // get impl
  IShading* getImpl() const { return impl; };

private:

  CGparameter  quadric;

  CGparameter  clip_infinite;

  // Material Properties and Parameters
  class IMaterial* materialProperty;

  // class pimpl for the data members
  IShading*  impl;

};


inline void
IQuadricShading::activate( M3dView& view, const MMatrix& quadric, const MPoint& ci) const {

  setUniforms( view, quadric, ci);
  impl->activate();
}

inline void
IQuadricShading::activateFBO() const {

  impl->activateFBO();
}

inline void
IQuadricShading::deactivate() const {

  impl->deactivate();
}

inline void
IQuadricShading::deactivateFBO() const {

  impl->readbackFBO();
  impl->deactivateFBO();
}

inline void
IQuadricShading::setUniforms( M3dView& view, const MMatrix& q_matrix, const MPoint& ci) const {

  cgGLSetStateMatrixParameter( impl->mvp, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
  cgGLSetStateMatrixParameter( impl->mv, CG_GL_MODELVIEW_MATRIX, CG_GL_MATRIX_IDENTITY);
  cgGLSetStateMatrixParameter( impl->p, CG_GL_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
  
  // set the quadric parameter
  float params_quadric[4][4];
  CHECK_MAYA( q_matrix.get( params_quadric));
  cgGLSetMatrixParameterfr( quadric, &(params_quadric[0][0]));

  // set clipping information for infinite quadrics
  cgGLSetParameter4f( clip_infinite, ci[0], ci[1], ci[2], ci[3]);

  setTransformedLightParameter( view );
}

void 
IQuadricShading::setLightPosition( MPoint &lightPosition ) const {

  cgGLSetParameter4f( impl->plPos, lightPosition.x, lightPosition.y, lightPosition.z, 1.0 );
}

void 
IQuadricShading::setTransformedLightParameter( M3dView &view ) const {

  // Get and Transform the Light Position from World
  // to View/Eye space.
  MPoint pointLocation;
  MDagPath cameraDagPath;
  
  Util::getPointLightPosition( pointLocation );
  view.getCamera( cameraDagPath );
  
  // Get the transform node
  cameraDagPath.pop();
  MFnTransform cameraTransform( cameraDagPath );

  // Transform the light position in world space
  // to view/eye space by multiplying by the 
  // *inverse* of the camera transform.
  MMatrix cTransformMatrix = cameraTransform.transformationMatrix();
  pointLocation = pointLocation * (cTransformMatrix.inverse());
  
  // Toss the parameter to the shader.
  setLightPosition( pointLocation );
}


#endif // _IQUADRIC_SHADING_H_

---