flat_shade.H

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#ifndef FLAT_SHADE_H_IS_INCLUDED
#define FLAT_SHADE_H_IS_INCLUDED

/*!
 *  \file flat_shade.H
 *  \brief Contains the definition of the FlatShadeTexture GTexture and related
 *  classes.
 *
 *  \sa flat_shade.C
 *
 */

#include "basic_texture.H"
#include "gl_sphir_tex_coord_gen.H"

/*!
 *  \brief A callback class for rendering each face of a Patch with a flat
 *  shading style.
 *
 *  This is the GLStripCB for the FlatShadeTexture GTexture.
 *
 *  \sa FlatShadeTexture
 *
 */
class FlatShadeStripCB : public GLStripCB {
   
   public:
   
      FlatShadeStripCB() : do_texcoords(false) 
     {
       auto_UV = new GLSphirTexCoordGen;
       auto_UV->setup();
       use_auto=false;
     }

     ~FlatShadeStripCB() 
     {
        delete auto_UV;
     }
      
      //! \name Accessor Functions
      //@{
      
      void enable_texcoords() { do_texcoords = true; }
      void disable_texcoords() { do_texcoords = false; }
      bool texcoords_enabled() { return do_texcoords; }

     void enable_autoUV() { use_auto = true; }
     void disable_autoUV() { use_auto =false; }
     bool autoUV_enabled() { return use_auto; }
      
      //@}
      
      //! \name Callback Hooks
      //@{
   
      virtual void faceCB(CBvert* v, CBface* f);
      
      //@}
      
   private:
   
      //! Should texture coordinates be sent to OpenGL with each vertex?
      bool do_texcoords;
     bool use_auto;
     TexCoordGen* auto_UV;

};

/*!
 *  \brief A GTexture that renders Patches in a flat shaded style.
 *
 */
class FlatShadeTexture : public BasicTexture {
   
   public:
   
      FlatShadeTexture(Patch* patch = 0, StripCB* cb=0) :
         BasicTexture(patch, cb ? cb : new FlatShadeStripCB),
         _debug_uv_in_dl(false),
         _has_uv_coords(false),
         _check_uv_coords_stamp(0) {}
      
      virtual ~FlatShadeTexture();
      
      //! \name Run-Time Type Id
      //@{
            
      DEFINE_RTTI_METHODS3("Flat Shading", FlatShadeTexture*, BasicTexture, CDATA_ITEM*);

      
      //@}
      
      //! \name Statics
      //@{
      
      static void toggle_debug_uv() { _debug_uv = !_debug_uv; }
      static bool debug_uv()        { return _debug_uv; }
      
      //@}
      
      //! \name GTexture Virtual Methods
      //@{
      
      virtual int draw(CVIEWptr& v);
      
      //@}
      
      //! \name DATA_ITEM Virtual Methods
      //@{
      
      virtual DATA_ITEM  *dup() const { return new FlatShadeTexture; }
      
      //@}

   protected:
   
      //! True if "debug uv" calls are in current display list.
      bool         _debug_uv_in_dl;
      
      //! True if some faces have uv-coords.
      bool         _has_uv_coords;
      
      //! _patch->stamp() at last check for uv-coords.
      uint         _check_uv_coords_stamp;
      TEXTUREptr   _debug_uv_tex;   //!< texture image for revealing uv-coords
      str_ptr      _debug_tex_path; //!< path to above image
      
      //! Tells whether to make "debug uv" calls when rendering:
      static bool _debug_uv;

};

#endif // FLAT_SHADE_H_IS_INCLUDED

/* end of file flat_shade.H */

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