Polygon Edge Smoothing with Shaders

OpenGL OpenGL: Advanced Coding
1

I’m trying to smooth the edges of rendered lines implemented as textured quads, to compensate for a removed functionality (thick stippled lines).

I use vertex and pixel shaders so no fixed path is utilized.


        glDisable(GL_DEPTH_TEST);

        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE);
        
        glEnable(GL_POLYGON_SMOOTH);
        
        glDrawArrays(GL_TRIANGLES, 0, 3 * vertices.size());

This is causing polygons not rendered. Is this a consequence of using shaders with some kind of “fixed functionality (polygon soothing)?”

I had a problem with using shaders and stippled lines that’s why I’m using my own line rendering implementation instead.

Thanks.

2

implemented as textured quads

But you iussue this commmand: glDrawArrays(GL_TRIANGLES …

Anyway, not the cause of

This is causing polygons not rendered

So what is your vertex array setup code?

3

Wide lines are back in the spec, since long ago. You can simulate stipples and whatever in frag-shader.