isphere_shading.h

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#ifndef _ISPHERE_SHADING_H_
#define _ISPHERE_SHADING_H_

// includes, file
#include <ishading.h>
#include <imaterial.h>

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

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

// variables, exported

class ISphereShading {

  friend class ISphereUI;

private:

  ISphereShading();

  ~ISphereShading();

  void initCg();

  void initGL();

  inline void activate( M3dView & view ) 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;

  // set shading parameter (called from activate)
  void setUniforms( M3dView & view ) const;

  // get IMaterial
  IMaterial* getMaterial() const { return materialProperty; };

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

private:

  // Material Properties and Parameters
  IMaterial* materialProperty;

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

};

inline void
ISphereShading::activate( M3dView & view) const {

  setUniforms( view);
  impl->activate();

  IShading::checkCgError( "IShading::init():: Creating program failed.");
}

inline void
ISphereShading::activateFBO() const {

  impl->activateFBO();
}

inline void
ISphereShading::deactivate() const {

  impl->deactivate();

  IShading::checkCgError( "IShading::init():: Creating program failed.");
}

inline void
ISphereShading::deactivateFBO() const {

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

inline void
ISphereShading::setUniforms( M3dView & view ) 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);
  
  setTransformedLightParameter( view );

  //getMaterial()->setShaderParameters();

  IShading::checkCgError( "IShading::init():: Creating program failed.");  
}

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

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

void ISphereShading::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 // _ISPHERE_SHADING_H_

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