使用freeglut进行OpenGL抗锯齿处理

Question

我正在使用freeglut.我正在努力让FSAA工作,但似乎没有任何工作.样本缓冲区为1,样本为4.但我没有看到任何抗锯齿.我错过了什么吗？目前,我正在运行Ubuntu 12.04; 不确定是否会改变任何东西.

#include <GL/glut.h>
#include <GL/glext.h>
#include <stdio.h>


void render(void);

int main(int argc, char **argv){    
    glutInit(&argc,argv);

    //Initialize the window
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_MULTISAMPLE);
    glutInitWindowPosition(100,100);
    glutInitWindowSize(200,200);
    glutCreateWindow("Testing");
    glutDisplayFunc(render);

    //Enable FSAA       
    glEnable(GL_MULTISAMPLE);

    //2D graphics
    glDisable(GL_DEPTH_TEST);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT), 0, 0, 1);
    glMatrixMode(GL_MODELVIEW);


    GLint buf, sbuf;
    glGetIntegerv(GL_SAMPLE_BUFFERS, &buf);
    printf("number of sample buffers is %d\n", buf);
    glGetIntegerv(GL_SAMPLES, &sbuf);
    printf("number of samples is %d\n", sbuf);

    glutMainLoop();
    return 0;
}

//Draw some stuff
void render(void){  
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

    glColor3f(0.0f,1.0f,0.0f);
    glBegin(GL_LINE_LOOP);
        glVertex2f(10.0,10.0);
        glVertex2f(170.0,60.0);
        glVertex2f(50.0,130.0);
        glVertex2f(50.0,60.0);
    glEnd();    

    glutSwapBuffers();
}

我很清楚SDL和GLFW.我想让它在freeglut中工作.

更多信息:
显卡:ATI Radeon HD 4250
OpenGL版本:3.3.11627兼容性配置文件上下文

Answer 1

要对 2D 中的点和线进行抗锯齿处理，您还可以执行以下操作：

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH, GL_NICEST);

glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH, GL_NICEST);