Question

So I’m rendering this diagram each frame:

https://dl.dropbox.com/u/44766482/diagramm.png

Basically, each second it moves everything one pixel to the left and every frame it updates the rightmost pixel column with current data. So a lot of changes are made.

It is completely constructed from GL_LINES, always from bottom to top.

However those black missing columns are not intentional at all, it’s just the rasterizer not picking them up.

I’m using integers for positions and bytes for colors, the projection matrix is exactly 1:1; translating by 1 means moving 1 pixel. Orthogonal.

So my problem is, how to get rid of the black lines? I suppose I could write the data to texture, but that seems expensive. Currently I use a VBO.

Answer 1

Render you columns as quads instead with a width of 1 pixel, the rasterization rules of OpenGL will make sure you have no holes this way.