Efficient drawing of 2d gridlines with shaders

Mike Mayo · 2012-07-05T08:00:43

I'm working on an android app and I'm targeting OpenGL ES 2 only. I want to draw grid lines around quads and I'm currently compiling them as a VBO and drawing them after I draw the quad itself. It currently looks like this: Now as you can see the grid lines aren't entirely symmetrical with respect to the quad itself. Neither is the fade-out I'm applying in the shader. I know I could fix this with a bit of math when I'm calculating the grid line VBO and applying a translation to the center-point used to calculate the fade, but that won't work when I start varying the size of the quads itself. Is there a simpler way to draw the grid lines than what I've come up with? I just want them to show up surrounding the quad and with a bit of a fade off that I can adjust no matter whether the quad is 1 unit or 3 units on a side or whatever. I've considered using a texture that looks like the grid lines but I don't think that'll work because of aliasing as I zoom out.

Graphics and GPU Programming Programming OpenGL

Started by ChugginWindex January 19, 2012 12:23 AM

19 comments, last by alb 11 years, 10 months ago

alb

107

July 05, 2012 08:00 AM

I would like to implement the approach of the virtual texturing.

I'm following the instructions of this thesis http://www.graphics....ring_low_03.pdf
I need what the author calls "Needbuffer" (pag 14).

I'm more or less at this point: [media]http://www.youtube.com/watch?feature=player_embedded&v=ONYt4hbitFE[/media]
and using the information about the level of detail I would like to load a texture composed with different level of details like in this video: [media]http://www.youtube.com/watch?feature=player_embedded&v=YCZl16JMF08[/media]

Efficient drawing of 2d gridlines with shaders

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Efficient drawing of 2d gridlines with shaders

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