GLPCTexture.h

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//# GLPCTexture.h:      Holds data for displaying images as textures.
//# Copyright (C) 2001
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef TRIALDISPLAY_GLPCTEXTURE_H
#define TRIALDISPLAY_GLPCTEXTURE_H

#include <graphics/X11/X_enter.h>
#include <GL/gl.h>
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <graphics/X11/X_exit.h>
#include <casa/aips.h>
#include <display/Display/GLPCDisplayList.h>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Holds parameters for setting glTexParameteri variables.
// </summary>
// <visibility=local>
// <synopsis>
// Holds parameters for setting glTexParameteri variables. See the man
// page for glTexParameteri for description. This class is not needed
// unless the caller wishes to change the defaults for a textured image.
// maxtexturesize is used to specify the maximum texture size used for
// an image. The value used will be the smallest power of 2 that
// is >= maxtexturesize. By default, the display hosts' maximum texture
// size will be used. Again, this isn't normally changed.
// GLPCTextureParams may be deleted after GLPCTexturedImage is created.
class GLPCTextureParams {
  public:
        GLPCTextureParams();
        GLPCTextureParams(const GLPCTextureParams &);
        GLPCTextureParams(const GLPCTextureParams *);
        void copy(const GLPCTextureParams &p);
        ~GLPCTextureParams();
        // Set min/mag filters. If magFilter is 0, use min Filter.
        void filter(GLint minFilter, GLint magFilter=0);
        // Set wrap parameters. If wrapT is 0, use wrapS.
        void wrap(GLint wrapS, GLint wrapT=0);

        // Set value to use for max texture size. Value will be rounded
        // up to a power of 2 >= maxTextureSize.
        void maxTextureSize(GLint maxtexturesize);
        void format(GLenum fmt);
        
        // For glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, mode);
        void environMode(GLenum mode);
  public:
        // glTexParameteri(GL_TEXTURE_2D, x, y).
        GLint   min_filter_;    // GL_TEXTURE_MIN_FILTER
        GLint   mag_filter_;    // GL_TEXTURE_MAG_FILTER
        GLint   wrap_s_;        // GL_TEXTURE_WRAP_S
        GLint   wrap_t_;        // GL_TEXTURE_WRAP_T

        // Maximum texture size to use. Default is host's max texture size.
        GLuint  maxtexturesize_;
        GLenum  envmode_;       // GL_DECAL, GL_BLEND or GL_MODULATE.
        GLenum  format_;        // GL_RGB or GL_COLOR_INDEX.
  private:
        void init();
};

class GLPCTextureObject;

// <prerequisite>
// <li> <linkto class="GLPCDisplayListEntry">GLPCDisplayListEntry</linkto>
// </prerequisite>
// <synopsis>
// GLPCTexturedImage is used to convert an image to texture objects for
// display. The pixels array contains pixels stored as RGB triples.
// This class is typically only used by
// <linkto class="GLPixelCanvas">GLPixelCanvas</linkto>
// If the image is larger than the maximum texture size, it will be broken
// into pieces that fit.
// </synopsis>
//<thrown><li> AipsError </thrown>
class GLPCTexturedImage : public GLPCDisplayListEntry {
  public:
        GLPCTexturedImage(GLsizei width, GLsizei height,
                          const GLushort *pixels,
                          const GLPCTextureParams* = NULL);
        ~GLPCTexturedImage();
        void draw();    // Draw image using current values.
        // Draw image and save values for later.
        void draw(GLfloat x, GLfloat y, GLfloat z=0.0,
                  GLfloat xscale=1.0, GLfloat yscale=1.0);

        void envmode(GLenum mode);
        GLenum envmode()const{return params_->envmode_;}
        GLPCTextureParams *params()const {return params_;}
  private:
        void createTextures(GLsizei dWidth, GLsizei dHeight);
        void storeImage(GLsizei dWidth, GLsizei dHeight,
                        const GLushort *pixels);
        int     ntx_, nty_;
        int     numTextures_;           // ntx_*nty_;
        GLPCTextureObject **textures_;  // numtexures entries.
        GLfloat x_, y_, z_;
        GLfloat xscale_, yscale_;
        GLsizei dWidth_, dHeight_;
        GLPCTextureParams *params_;
        GLint   maxTextureSize_;
};


} //# NAMESPACE CASA - END

#endif