X3DTextureNode.h

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//    Copyright 2004, 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 __X3DTEXTURENODE_H__
#define __X3DTEXTURENODE_H__

#include "X3DAppearanceChildNode.h"
#include "Image.h"
#include "GL/glew.h"

namespace H3D {

  class H3DAPI_API X3DTextureNode : public X3DAppearanceChildNode {
  public:
        
    H3D_API_EXCEPTION( InvalidTextureDimensions );

    H3D_API_EXCEPTION( OpenGLTextureError );

    H3D_API_EXCEPTION( glTexImageFunctionNotDefined );

    X3DTextureNode( Inst< DisplayList > _displayList = 0,
                    Inst< SFNode>  _metadata = 0 );
        
    virtual void enableTexturing() = 0;

    virtual void disableTexturing() = 0;
        
    virtual string defaultXMLContainerField() {
      return "texture";
    }

    virtual void preRender() {
      glPushAttrib( GL_TEXTURE_BIT | GL_LIGHTING_BIT );
      setActiveTexture( this );
    }

    virtual void postRender() {
      glPopAttrib();
      setActiveTexture( NULL );
    }

    virtual Vec3f textureSize() { return Vec3f( 0, 0, 0 ); } 

    static X3DTextureNode *getActiveTexture() { return active_texture; }

    virtual GLuint renderImage( Image *image, 
                                GLenum texture_target,
                                bool scale_to_power_of_two );

    // Below are help functions for getting OpenGL constants from an Image.

    virtual GLint glInternalFormat( Image *image );

    virtual GLenum glPixelFormat( Image *image );

    virtual GLenum glPixelComponentType( Image *image );

    virtual void glTexImage( Image *image,
                             GLenum texture_target,
                             bool scale_to_power_of_two ){
      throw glTexImageFunctionNotDefined( "", H3D_FULL_LOCATION ); 
    }

  protected:
    // The glTexImage functions needs each line of image data to be 4 byte 
    // aligned. This function takes a pointer to image data and width,height
    // and bits per pixel for that data and returns a pointer to new image
    // data where the data has been padded with dummy values in order to
    // align it to the closest 4 byte position.
    static void *padTo4ByteAlignment( const void *data,
                                      unsigned int width,
                                      unsigned int height,
                                      unsigned int depth,
                                      unsigned int bits_per_pixel );

    static void setActiveTexture( X3DTextureNode *t ) { active_texture = t; }
  
  private:
    static X3DTextureNode *active_texture;
  };
}

#endif

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