background.cpp

SDL-Ball这款经典的弹球游戏克隆自arkanoid、dxball、breakout

/* ************************************************************************* * 
    SDL-Ball - DX-Ball/Breakout remake with openGL and SDL for Linux 
    Copyright (C) 2008 DusteD.dk

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>. 
 * ************************************************************************* */


class backgroundClass {
  private:
  GLfloat rot, zoom,zoomb;
  GLfloat r[12], g[12], b[12], a[12];

  textureClass tex;
  bool dir;
  bool firstTexture;
  public:

    
    backgroundClass()
    {
      initb();
      firstTexture=1;
    }
    
    void init(textureManager & texMgr)
    {
      //Så vi ikke kommer til at slette texture 0 første gang funktionen bliver kaldt
      if(!firstTexture)
        glDeleteTextures(1, &tex.prop.texture);
      
      float t = 0.25 * ((float)player.level+1);

      if(t <= 1.0)
        texMgr.load("data/gfx/bg/1.png", tex);
      else if(t <= 2.0)
        texMgr.load("data/gfx/bg/2.png", tex);
      else if(t <= 3.0)
        texMgr.load("data/gfx/bg/3.png", tex);
      else if(t <= 4.0)
        texMgr.load("data/gfx/bg/4.png", tex);
      else if(t <= 5.0)
        texMgr.load("data/gfx/bg/5.png", tex);
      else if(t <= 6.0)
        texMgr.load("data/gfx/bg/6.png", tex);
      else if(t <= 7.0)
        texMgr.load("data/gfx/bg/7.png", tex);
      else if(t <= 8.0)
        texMgr.load("data/gfx/bg/8.png", tex);
      else if(t <= 9.0)
        texMgr.load("data/gfx/bg/9.png", tex);
      else if(t <= 10.0)
        texMgr.load("data/gfx/bg/10.png", tex);
      else if(t <= 11.0)
        texMgr.load("data/gfx/bg/11.png", tex);
      else if(t <= 12.0)
        texMgr.load("data/gfx/bg/12.png", tex);
      else if(t <= 13.0)
        texMgr.load("data/gfx/bg/13.png", tex);
      else if(t <= 14.0)
        texMgr.load("data/gfx/bg/14.png", tex);
      else if(t <= 15.0)
        texMgr.load("data/gfx/bg/15.png", tex);
      else if(t <= 16.0)
        texMgr.load("data/gfx/bg/16.png", tex);
      else if(t <= 17.0)
        texMgr.load("data/gfx/bg/17.png", tex);
      else if(t <= 18.0)
        texMgr.load("data/gfx/bg/18.png", tex);
      else if(t <= 19.0)
        texMgr.load("data/gfx/bg/19.png", tex);
      else if(t <= 20.0)
        texMgr.load("data/gfx/bg/20.png", tex);
      else if(t <= 21.0)
        texMgr.load("data/gfx/bg/21.png", tex);
      else if(t <= 22.0)
        texMgr.load("data/gfx/bg/22.png", tex);
      else if(t <= 23.0)
        texMgr.load("data/gfx/bg/23.png", tex);
      else if(t <= 24.0)
        texMgr.load("data/gfx/bg/24.png", tex);
      else if(t <= 25.0)
        texMgr.load("data/gfx/bg/25.png", tex);
      else
        texMgr.load("data/gfx/bg/final.png", tex);
      

      firstTexture=0;
      initb();
    }
    
    void initb()
    {
      int i;
      
      for(i = 0; i  < 4; i++)
      {
        r[i] = rndflt(1,0);
        g[i] = rndflt(1,0);
        b[i] = rndflt(1,0);
        a[i] = 1;
      }
      
      for(i = 4; i  < 12; i++)
      {
        r[i] = rndflt(1,0);
        g[i] = rndflt(1,0);
        b[i] = rndflt(1,0);
        a[i] = 0.6;
      }

      rot=0;
      zoom=1.0;
      zoomb=1.0;
       
      dir=1;
    }

    void draw()
    {

      glLoadIdentity();
      glTranslatef( 0, 0, -3.0 );
  
      glEnable(GL_TEXTURE_2D);
      glEnable(GL_BLEND);
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    
      glBindTexture(GL_TEXTURE_2D, tex.prop.texture);
      
      glBegin( GL_QUADS );
        glColor4f(r[0],g[0],b[0],a[0]); 
        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.66, 1.25, 0.0f );
        glColor4f(r[1],g[1],b[1],a[1]); 
        glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.66, 1.25, 0.0f );
        glColor4f(r[2],g[2],b[2],a[2]); 
        glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.66,-1.25, 0.0f );
        glColor4f(r[3],g[3],b[3],a[3]); 
        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.66,-1.25, 0.0f );
      glEnd( );

      if(setting.eyeCandy)
      {
        
        if(dir)
        {
          zoomb+= globalTicks/200000.0;
          zoom += globalTicks/400000.0;
        }  else {
          zoomb-= globalTicks/100000.0;
          zoom -= globalTicks/200000.0;
        }
  
        if(zoomb > 2.0)
          dir=0;
        if(zoomb < 1.0)
          dir=1;
      
        glBegin( GL_QUADS );
          glColor4f(r[4],g[4],b[4],a[4]); 
          glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.66*zoom, 1.25*zoom, 0.0f );
          glColor4f(r[5],g[5],b[5],a[5]); 
          glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.66*zoom, 1.25*zoom, 0.0f );
          glColor4f(r[6],g[6],b[6],a[6]); 
          glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.66*zoom,-1.25*zoom, 0.0f );
          glColor4f(r[7],g[7],b[7],a[7]); 
          glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.66*zoom,-1.25*zoom, 0.0f );
        glEnd( );
        
        glBegin( GL_QUADS );
          glColor4f(r[8],g[8],b[8],a[8]); 
          glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.66*zoomb, 1.25*zoomb, 0.0f );
          glColor4f(r[9],g[9],b[9],a[9]); 
          glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.66*zoomb, 1.25*zoomb, 0.0f );
          glColor4f(r[10],g[10],b[10],a[10]); 
          glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.66*zoomb,-1.25*zoomb, 0.0f );
          glColor4f(r[11],g[11],b[11],a[11]); 
          glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.66*zoomb,-1.25*zoomb, 0.0f );
        glEnd( );
      }

    }
};