读书笔记——使用模板缓冲区

GLfloat angle=0.0f;  
GLfloat radius=1.01f;  
  
glEnable(GL_STENCIL_TEST);  
glClearStencil(0);  
glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);  
  
glColor3f(1.0f,0.0f,1.0f);  
glStencilFunc(GL_NEVER,0,0);  
glStencilOp(GL_INCR,GL_INCR,GL_INCR);  
glBegin(GL_LINE_STRIP);  
    for (angle=0.0f;angle<400.0f;angle+=0.1)  
    {  
        glVertex2f(radius*cos(angle),radius*sin(angle));  
        radius*=1.002;  
    }  
glEnd();  
  
glColor3f(1.0f,0.0f,0.0f);  
glStencilFunc(GL_NOTEQUAL,1,1);  
glStencilOp(GL_KEEP,GL_KEEP,GL_KEEP);  
glRectf(x,y,x+RectSize,y-RectSize);  
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