glsl_hatching.H

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/**********************************************************************
 * glsl_hatching.H:
 **********************************************************************/
#ifndef GLSL_HATCHING_H_IS_INCLUDED
#define GLSL_HATCHING_H_IS_INCLUDED

#include "glsl_paper.H"

/**********************************************************************
 * GLSLHatching:
 *
 *  Simple image-space hatching via GLSL fragment program
 *
 **********************************************************************/
class GLSLHatching : public GLSLPaperShader {
 public:
   //******** MANAGERS ********
   GLSLHatching(Patch* patch = 0);
   
   virtual ~GLSLHatching();

   //******** RUN-TIME TYPE ID ********
   DEFINE_RTTI_METHODS3("GLSL Hatching", GLSLHatching*, BasicTexture, CDATA_ITEM*);

   //******** ACCESSORS ********
   void set_style(int l, int l2, int l3) {
      _style[0] = l; 
      _style[1] = l2; 
      _style[2] = l3; 
   }

   //******** GLSLShader VIRTUAL METHODS ********
   void set_tone_shader(GTexture* g);

   // using a static variable for program, so all GLSLHatching
   // instances share the same program:
   virtual GLuint& program() { return _program; }
   virtual bool&  did_init() { return _did_init; }

   virtual bool get_variable_locs();

   virtual bool set_uniform_variables() const;

   virtual void set_gl_state(GLbitfield mask=0) const;

   // ******** GTexture VIRTUAL METHODS ********
   virtual ref_img_t use_ref_image();
   virtual int       draw_tex_mem_ref();

   // Returns a list of the slave gtextures of this class
   virtual GTexture_list gtextures() const;

   //******** DATA_ITEM VIRTUAL METHODS ********
   virtual DATA_ITEM  *dup() const { return new GLSLHatching; }

 protected:
   // shader used to draw the tone reference image:
   GTexture*     _tone_shader;

   GLint         _style[4];

   static GLuint _program;  // GLSL program shared by all instances
   static bool   _did_init; // tells whether initialization attempt was made

   // tone map variables:
   static GLint  _tone_tex_loc;
   static GLint  _width_loc;
   static GLint  _height_loc;

   static GLint  _style_loc;  

   //******** VIRTUAL METHODS ********

   // GLSL vertex shader name
   virtual str_ptr vp_filename() { return vp_name("hatching"); }

   // GLSL fragment shader name
   virtual str_ptr fp_filename() { return fp_name("hatching"); }
};

#endif // GLSL_HATCHING_H_IS_INCLUDED

// end of file glsl_hatching.H

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