OpenGL Screencast 15: Textures part 2

015.c

int main(int argc,char* argv[])
{
  initializeGlobals();
  /* screencast specific variables */
  windowName = "OpenGL screenscasts 15: Textures part 2";
  screencastID = 15;
  dim = 4;
  fov = 50;
  th = -25;
  ph = 15;
  ecX = -1.0;
  ecZ = -1.0;
  distance = 2;
  toggleLight = 0;
  toggleAxes = 0;

  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
  glutInitWindowSize(windowWidth,windowHeight);
  glutInitWindowPosition(450,350);
  glutCreateWindow(windowName);

  glutDisplayFunc(display);
  glutReshapeFunc(displayReshape);
  glutKeyboardFunc(windowKey);
  glutSpecialFunc(windowSpecial);

  initializeTextures();

  redisplayAll();
  glutMainLoop();
  return 0;
}

draw.c

void drawScreencast15(void)
{

  GLenum minfilter = GL_NEAREST;
  GLenum magfilter = GL_NEAREST;
  GLenum env = GL_MODULATE;
  //GLenum env = GL_REPLACE;

  GLenum wraps = GL_CLAMP;
  GLenum wrapt = GL_REPEAT;
  //  GLenum wrapt = GL_MIRRORED_REPEAT;

  
  if (toggleLight)
    drawLight();
  /*
  currentTexture = textures[TEX_CRATE];
  cube(0,0,0, 1,1,1, 0);

  currentTexture = textures[TEX_FIRE];
  cone(2,0,0, 1,1, 5); 

  currentTexture = textures[TEX_VENUS];
  sphere(0,1,1.5, 0.5,0);
  */
  //currentTexture = textures[TEX_FIRE];
  //currentTexture = textures[TEX_EARTH];
  //currentTexture = textures[TEX_ICE];
  //currentTexture = textures[TEX_DEFAULT];
  //cylinder(-2,0,0, 1,1);
  //currentTexture = textures[TEX_DEFAULT];

  /*
   * Other Texture functions/Parameters
   */

  glEnable(GL_TEXTURE_2D);  
  currentTexture = textures[TEX_ICE];
  glBindTexture(GL_TEXTURE_2D,currentTexture);
  // Minification and Magnification Filters
  // Used to perform calculations as to how a texel corresponds to 
  //  a pixel on the screen
  // GLenum minfilter = GL_NEAREST
  // GLenum magfilter = GL_NEAREST
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilter);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilter);
  // Clamp or Repeat texture outside of [0,1]
  // GLenum wraps|wrapt = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_BORDER,
  //                      GL_CLAMP_TO_EDGE, GL_MIRRORED_REPEAT
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wraps);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapt);
  // Specifies how texture values are combined with the color values of 
  //  the fragment being processed
  // GLenum env = GL_REPLACE, GL_BLEND, GL_MODULATE, GL_DECAL, 
  //              GL_COMBINE, GL_ADD
  glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, env);
  // Determine the color to be used for GL_BLEND operations
  //glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, env_color);
  // 
  //glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, border_color);
  
  glBegin(GL_QUADS);
  glNormal3f(0,0,1);
  glTexCoord2f(0,0); glVertex3f(0,0,0);
  glTexCoord2f(2,0); glVertex3f(1,0,0);
  glTexCoord2f(2,2); glVertex3f(1,1,0);
  glTexCoord2f(0,2); glVertex3f(0,1,0);

  glTexCoord2f(0,0); glVertex3f(-1,1,0);
  glTexCoord2f(2,0); glVertex3f(1,1,0);
  glTexCoord2f(2,2); glVertex3f(1,3,0);
  glTexCoord2f(0,2); glVertex3f(-1,3,0);
  glEnd();
  glDisable(GL_TEXTURE_2D);

}