Draw the 2d Tile Image Using OpenGL and C++

leothenerd 2:59 am on December 3, 2009 | Answers: 1    
Tags: draw (2), image (24), opengl (8), tile

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• leothenerd 2:59 am on December 3, 2009
  

  void drawGLTexture(GLuint *texture, int x, int y, int width, int height, int tileIndex, int column, int row)
  {
    float cOffset = (float)1.0 / (float)column;
    float rOffset = (float)1.0 / (float)row;
    float tileRowPos = (float)(tileIndex / column) * rOffset;
    float tileColumnPos = (float)(tileIndex % column) * cOffset;
    float x2 = (float)x + width;
    float y2 = (float)y + height;
    // Bind the texture to which subsequent calls refer to
    glBindTexture( GL_TEXTURE_2D, *texture );
  
    glBegin( GL_QUADS );
    //Top-left vertex (corner)
    glTexCoord2f((float)tileColumnPos, (float)tileRowPos );
    //glTexCoord2f(0.0f, 0.0f );
    glVertex3f((float)x, (float)y, 0.0f );
  
    //Bottom-left vertex (corner)
    glTexCoord2f( (float)tileColumnPos + cOffset, (float)tileRowPos );
    glVertex3f((float)x2, (float)y, 0 );
  
    //Bottom-right vertex (corner)
    glTexCoord2f( (float)tileColumnPos + cOffset, (float)tileRowPos + rOffset );
    glVertex3f((float)x2, (float)y2, 0 );
  
    //Top-right vertex (corner)
    glTexCoord2f( (float)tileColumnPos, (float)tileRowPos + rOffset );
    glVertex3f((float)x, (float)y2, 0 );
    glEnd();
  }