Hello,
I start in opengl programming. I successfully render a face (2 triangles) with vertex and fragment shader. Now I want to see if it's also to render a shader whitout faces. I mean a shader that is simply painting the screen surface with color. Does someone has already done this kind of rendering?
Thank you for your help.
I think that if you want to do that, you need to render two triangles of the size of the screen, otherwise you can use the glClear color to do that. I also recommend you to take a look to this http://duriansoftware.com/joe/An-intro-to-modern-OpenGL.-Chapter-1:-The-Graphics-Pipeline.html
Pay special attention to the rasterizing part, that would help you to understand better how it works
Thank you Diego for your answer. It's exactly what I did, using a face that match the screen but I was curious to know if it's possible to manipulate directly the framebuffer in shaders.
Thank you also for the link I will read it to have better knowledge on the pipeline.
You can use a single triangle with doubled side-lengths containing the whole screen and some outside, it will be clipped automatically and is a bit better than 2.
Though, for just a single color use glClear, as said above, because it doesn't need a shader.
