如何在OpenGL中使用alpha透明度？

Here's my code:

这是我的代码：

void display(void);

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGBA);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glEnable( GL_BLEND );
    glutInitWindowSize(600,600);
    glutInitWindowPosition(200,50);
    glutCreateWindow("glut test");
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glPointSize(8);
    glBegin(GL_POINTS);
    glColor4f(.23,.78,.32,1.0);
    glVertex2f(0,0);
    glColor4f(.23,.78,.32,0.1);
    glVertex2f(0.1,0);
    glEnd();
    glFlush();
}

The problem is that these two points appear identical (even when I set the alpha to 0). Is there something I missed to enable alpha transparency?

问题是这两个点看起来是相同的（即使我将alpha设置为0）。有没有我错过了启用alpha透明度的东西？

2 个解决方案

#1

Just a guess, but could it be that you dont have a background color ? So, when your rendering the second vertex which has alpha 0.1, there is no background to compute the proper color ? Just a guess, been years since i used opengl.

只是一个猜测，但可能是你没有背景颜色？那么，当你渲染第二个具有alpha 0.1的顶点时，没有背景来计算正确的颜色？只是猜测，自从我使用opengl以来已经有好几年了。

#2

have you glEnable'd alpha blending? And have you set up your blend parameters? You can't just set the alpha you need to setup various other parameters in OpenGL.

你有glEnable'd alpha混合吗？你有没有设置你的混合参数？您不能只设置在OpenGL中设置各种其他参数所需的alpha。

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