glh_glut_text.h

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/*
glh - is a platform-indepenedent C++ OpenGL helper library 

  
    Copyright (c) 2000 Cass Everitt
        Copyright (c) 2000 NVIDIA Corporation
    All rights reserved.
        
    Redistribution and use in source and binary forms, with or
    without modification, are permitted provided that the following
    conditions are met:
          
        * Redistributions of source code must retain the above
          copyright notice, this list of conditions and the following
          disclaimer.
                
    * Redistributions in binary form must reproduce the above
          copyright notice, this list of conditions and the following
          disclaimer in the documentation and/or other materials
          provided with the distribution.
                  
        * The names of contributors to this software may not be used
          to endorse or promote products derived from this software
          without specific prior written permission. 
                        
        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
        ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
        LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
        FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
        REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
        INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
        BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
        CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
        POSSIBILITY OF SUCH DAMAGE. 
                          
                                
        Cass Everitt - cass@r3.nu
*/

#ifndef GLH_GLUT_TEXT_H
#define GLH_GLUT_TEXT_H

#include <glh/glh_obs.h>
#include <glh/glh_text.h>

#ifdef MACOS
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

namespace glh
{
        
        struct glut_stroke_roman : font
        {
                glut_stroke_roman() : initialized(false) {}

        virtual ~glut_stroke_roman() { } 
        
        struct glyph
                {
                        float width;
                        display_list dl;
                };
                
                
                // get font metrics
                virtual float get_ascent()
                {  return 119.05f; }
                virtual float get_descent()
                {  return  33.33f; }
                virtual float get_width(int i)
                {
                        if(32 <= i && i <= 127)
                        {
                                if(! initialized) init();
                                return glyphs[i].width;
                        }
                        return 0;
                }
                
                // draw
                virtual void  render(int i)
                {
                        if(32 <= i && i <= 127)
                        {
                                if(! initialized) init();
                                glyphs[i].dl.call_list();
                        }                       
                }

                virtual void initialize() { if(! initialized) init(); }
                
                bool initialized;
                glyph glyphs[128];
                
        private:
                        
                void init()
                {
                        initialized = true;
                        GLfloat m[16];
                        glColorMask(0,0,0,0);
                        glDepthMask(0);
                        glStencilMask(0);
                        for(int i=32; i < 128; i++)
                        {
                                glPushMatrix();
                                glLoadIdentity();

                                // build display list
                                glyphs[i].dl.new_list(GL_COMPILE_AND_EXECUTE);
                                glutStrokeCharacter(GLUT_STROKE_ROMAN, i);
                                glyphs[i].dl.end_list();
                                // get *float* character width (glut only returns integer width)
                                glGetFloatv(GL_MODELVIEW_MATRIX, m);
                                glyphs[i].width = m[12];

                                glPopMatrix();
                        }
                        glColorMask(1,1,1,1);
                        glDepthMask(1);
                        glStencilMask(1);
                }

        };
        
        
        struct glut_stroke_mono_roman : font
        {
                glut_stroke_mono_roman() : initialized(false) {}
                
        virtual ~glut_stroke_mono_roman() { }
        
                struct glyph
                {
                        display_list dl;
                };
                
                
                // get font metrics
                virtual float get_ascent()
                {  return 119.05f; }
                virtual float get_descent()
                {  return  33.33f; }
                virtual float get_width(int i)
                {
                        if(32 <= i && i <= 127)
                        {
                                if(! initialized) init();
                                return 104.76;
                        }
                        return 0;
                }
                
                // draw
                virtual void  render(int i)
                {
                        if(32 <= i && i <= 127)
                        {
                                if(! initialized) init();
                                glyphs[i].dl.call_list();
                        }                       
                }

                virtual void initialize() { if(! initialized) init(); }
                
                bool initialized;
                glyph glyphs[128];
                
        private:
                        
                void init()
                {
                        initialized = true;
                        for(int i=32; i < 128; i++)
                        {
                                // build display list
                                glyphs[i].dl.new_list(GL_COMPILE);
                                glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN, i);
                                glyphs[i].dl.end_list();
                        }
                }

        };
        
        
        
}

#endif