SoShaderProgramElement.h

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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
 
#ifndef  _SO_SHADER_PROGRAM_ELEMENT_
#define  _SO_SHADER_PROGRAM_ELEMENT_
 
#include <Inventor/elements/SoReplacedElement.h>
#include <Inventor/misc/SoRef.h>
#include <Inventor/nodes/SoShaderProgram.h>
 
class SoGLShaderProgram ;
class SoGLRenderAction;

SoEXTENDER_Documented class  SoShaderProgramElement : public SoReplacedElement {
 
  SO_ELEMENT_HEADER(SoShaderProgramElement);
 
public:
 

  static void set(SoState *state, SoNode *node);

  static void get(SoState *state, SoShaderProgram *&);

  virtual void push(SoState *) ;

  virtual void pop(SoState *state, const SoElement *prevTopElement);
 
private:

  virtual void commonInit();

  virtual void init(SoState *state);
 
private:
  // Initializes the classes.
  static void initClass();
  static void exitClass();

  static const SoShaderProgramElement* get(SoState *state);

  inline bool isEnabled() const { return m_enabled; }

  inline bool isInternal() const { return m_internal; }
 
  static SoShaderProgramElement * getCurrentElement(SoState *);

  static SbBool generatesTransparency(SoState *state);

  static bool hasTessellationShader(SoState *state);
 
private:
  // Destructor
  virtual ~SoShaderProgramElement();
 
  // Current shader storage
  SoRef<SoShaderProgram> m_shaderProgram ;

  bool m_enabled;
 
  // describes if the shader program is set by the user (i.e. false) or by a
  // shader-dependent node (i.e. true, such as SoShadowGroup or SoMultipleInstance).
  bool m_internal;
 
};
#endif /* _SO_GL_SHADER_PROGRAM_ELEMENT_ */