ShaderPart.h

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//    Copyright 2004-2019, SenseGraphics AB
//
//    This file is part of H3D API.
//
//    H3D API is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    H3D API is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with H3D API; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//    A commercial license is also available. Please contact us at 
//    www.sensegraphics.com for more information.
//
//
//
#ifndef __SHADERPART_H__
#define __SHADERPART_H__
 
#include <H3D/X3DNode.h>
#include <H3D/X3DUrlObject.h>
#include <GL/glew.h>
#include <H3D/SFString.h>
#include <H3D/SFInt32.h>
#include <H3D/SFBool.h>
#include <H3D/DebugOptions.h>
 
namespace H3D {
  // forward declarations
  class ComposedShader;
 
  class H3DAPI_API ShaderPart : 
    public X3DNode, 
    public X3DUrlObject {
  public:
    class H3DAPI_API SFShaderString : public TypedField< EventCollectingField< SFString >, 
      Types<MFString,SFBool>, AnyNumber< Field > > {
    protected:
      virtual void update();
 
      virtual bool doFullRebuild();
 
    public:
      bool modifyShaderConstants(Field* field);
    };
 
    ShaderPart( Inst< SFNode         > _metadata      = 0,
                Inst< MFString       > _url           = 0,
                Inst< SFString       > _type          = 0,
                Inst< SFShaderString > _shaderString = 0,
                Inst< SFBool         > _forceReload   = 0);
    
    virtual GLhandleARB compileShader();
 
    void setParentComposedShader( ComposedShader *s );
 
    inline ComposedShader * getParentComposedShader() {
      return parent_composed_shader;
    }
 
    bool modifyShaderConstants(Field* field);
 
    bool replaceString( string &string_to_update,
      const std::string& string_start,
      const std::string& string_end,
      const std::string& to_insert,
      const std::string& conditional_string = "");
 
    inline GLhandleARB getShaderHandle() {
      return shader_handle;
    }
 
    virtual bool isCompiled ();
 
    H3DUniquePtr< SFString > type;
 
    H3DUniquePtr< SFShaderString > shaderString;
 
    H3DUniquePtr< SFBool > forceReload;
 
    virtual string defaultXMLContainerField() {
      return "parts";
    }
 
    virtual X3DUrlObject::LoadStatus loadStatus();
 
    static H3DNodeDatabase database;
    
  protected:
    ComposedShader * parent_composed_shader;
 
    GLhandleARB shader_handle;
    GLhandleARB compileShaderPart();
 
    bool getConstantVariableString(Field* const in_variable, 
      std::string& out_name, std::string& out_type, std::string& out_field_value);
 
    std::string shaderStringFromURL ( const std::string& shader_url );
 
    std::string preProcess ( const std::string& input, const std::string& _url, int depth= 0 );
 
    void updateShaderConstantValues( std::string &input, bool update_all_values );
 
    void updateSinglePassStereoValues( std::string &input );
 
    bool printShaderLog();
    DebugOptions *debug_options_previous;
  public:
    virtual void initialize();
  };
}
 
#endif