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#ifndef GLT_TEXTURE_H
#define GLT_TEXTURE_H
/*
GLT OpenGL C++ Toolkit
Copyright (C) 2000-2002 Nigel Stewart
Email: nigels@nigels.com WWW: http://www.nigels.com/glt/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! \file
\brief OpenGL Texture Class
\ingroup GLT
$Id: texture.h,v 1.22 2002/10/07 16:33:35 nigels Exp $
$Log: texture.h,v $
Revision 1.22 2002/10/07 16:33:35 nigels
Added CVS info
*/
#include "glt_config.h"
#include "glt_gl.h"
#include "glt_refcount.h"
#include <iosfwd>
#include <string>
/*! \class GltTexture
\brief OpenGL Texture Class
\ingroup GLT
*/
class GltTexture;
typedef ReferenceCountPtr<GltTexture> GltTexturePtr;
class GltTexture
{
public:
//
// Constructor/Destructor
//
/// Constructor
GltTexture(const GLenum target = GL_TEXTURE_2D);
/// Destructor
~GltTexture();
//
// Textures can't be copied
//
private:
/// Copy constructor is private to prevent copying
GltTexture(const GltTexture &);
/// Assignment operator is private to prevent copying
GltTexture &operator=(const GltTexture &);
public:
/// Reset texture and release OpenGL resources
void clear();
#if 0
/// Initialise from compressed GLT format
bool init(const void *,const bool mipmap = true);
/// Initialise from raw string buffer
bool init(const GLsizei width,const GLsizei height,const std::string &image,const bool mipmap = true);
#endif
/// Initialise from raw memory buffer
bool init(const GLsizei width,const GLsizei height,const byte *image,const GLsizei channels,const bool mipmap = true);
/// Set the current OpenGL texture
void set() const;
/*!
\brief Set wrapping of OpenGL texture coordinates
\param s Horizontal mapping mode
\param t Vertical mapping mode
Wrapping mode can be either of
<table>
<tr><td><b>GL_CLAMP </b></td><td> Clamp coordinate to [0,1].</td></tr>
<tr><td><b>GL_REPEAT </b></td><td> Ignore integer part of coordinate.</td></tr>
</table>
*/
void setWrap(const GLenum s,const GLenum t);
/*!
\brief Set filtering of OpenGL texture
\param min Texture minification function
\param mag Texture magnification function
Wrapping mode is one of
<table>
<tr><td><b>GL_NEAREST </b></td><td>Nearest texel.</td></tr>
<tr><td><b>GL_LINEAR </b></td><td>Linearly interpolate.</td></tr>
<tr><td><b>GL_NEAREST_MIPMAP_NEAREST</b></td><td>Nearest texel in nearest mipmap.</td></tr>
<tr><td><b>GL_NEAREST_MIPMAP_LINEAR </b></td><td>Linearly interpolate nearest texel from closest two mipmaps.</td></tr>
<tr><td><b>GL_LINEAR_MIPMAP_NEAREST </b></td><td>Linearly interpolate from nearest mipmap.</td></tr>
<tr><td><b>GL_LINEAR_MIPMAP_LINEAR </b></td><td>Linearly interpolate interpolated texel from closest two mipmaps.</td></tr>
</table>
*/
void setFilter(const GLenum min,const GLenum mag);
/// Gamma adjustment of OpenGL texture
void setGamma(const real gamma);
/// Hue-saturation-value adjustment of OpenGL texture
void setHSVAdjust(const real hue,const real saturation,const real value);
//
//
//
/// Texture width
const GLsizei &width() const;
/// Texture height
const GLsizei &height() const;
/// OpenGL texture identifier
const GLuint id() const;
// Serialisation
/*!
\brief GLT texture types
\ingroup GLT
*/
typedef enum
{
TEXTURE_TYPE_RGB = 0, /*!< RGB */
TEXTURE_TYPE_RGBA, /*!< RGBA */
TEXTURE_TYPE_GREY, /*!< Greyscale */
TEXTURE_TYPE_GREYA, /*!< Greyscale, Alpha */
TEXTURE_TYPE_ALPHA, /*!< Alpha */
TEXTURE_TYPE_BITMAP, /*!< Bitmap */
TEXTURE_TYPE_INDEXED_RGB, /*!< Indexed RGB */
TEXTURE_TYPE_INDEXED_RGBA, /*!< Indexed RGBA */
// Add new types to the end, for compatibility
} GltTextureType;
/// Encode GLT Texture header
static bool makeHeader(std::string &header,const int type,const int width,const int height,const int alignment,const int compressed);
/// Extract GLT Texture header
static void *getHeader(const void * const h,int &type,int &width,int &height,int &alignment,int &compressed);
private:
GLenum _target;
GLint _components;
GLsizei _width;
GLsizei _height;
GLint _border;
GLenum _format;
GLenum _type;
GLint _alignment;
GLenum _wrapS,_wrapT;
GLenum _filterMin,_filterMag;
real _gamma;
real _hue,_saturation,_value;
GLuint _id; // OpenGL texture ID
};
#endif
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