opengl 开发笔记-性能优化之顶点缓存

• 定义顶点缓存

  static GLuint vertex_buffer = 0;
  static GLuint texcoord_buffer = 0;

• 初始化顶点缓存

  void initVBO(){
      glGenBuffers(1,&vertex_buffer);   
      glBindBuffer(GL_ARRAY_BUFFER,vertex_buffer);
      glBufferData(GL_ARRAY_BUFFER,sizeof(rect_vertexes),rect_vertexes,GL_STATIC_DRAW);
     
      glGenBuffers(1,&texcoord_buffer);   
      glBindBuffer(GL_ARRAY_BUFFER,texcoord_buffer);
      glBufferData(GL_ARRAY_BUFFER,sizeof(texture_coords),texture_coords,GL_STATIC_DRAW);
  }
  

• 绘制图形

  void draw_texture(){
      glEnableClientState(GL_VERTEX_ARRAY);
      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  
      glEnable(GL_TEXTURE_2D);
      glBindTexture(GL_TEXTURE_2D,texture_id);
      glBindBuffer(GL_ARRAY_BUFFER,texcoord_buffer);
      glTexCoordPointer(sizeof(Vertex2F)/sizeof(GLfloat),GL_FLOAT,0,NULL);
     
      glColor4f(white_color.r,white_color.g,white_color.b,white_color.a);
      glBindBuffer(GL_ARRAY_BUFFER,vertex_buffer);
      glVertexPointer(sizeof(Vertex2F)/sizeof(GLfloat),GL_FLOAT,0,NULL);
     
      glDrawArrays(GL_TRIANGLE_STRIP,0,4);
     
      glBindBuffer(GL_ARRAY_BUFFER,0);
      glDisable(GL_TEXTURE_2D);
      glDisableClientState(GL_TEXTURE_COORD_ARRAY);
      glDisableClientState(GL_VERTEX_ARRAY);
  }  
  

• 编译程序

  g++ DrawBuffers.cpp -lGLEW -lGL -lGLU -lglut -lpng -o DrawBuffers

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