Advanced OpenGL: Point Size

toneburst

I've been hacking on the Advanced OpenGL example sketch, trying to create a VBO-based grid that I can then apply GLSL shaders to, to do various cool things.

One of the things I want to do is add an option to display grid vertices as points. I've managed to get that working, but I can't work out how to change the point-size with an OpenGL call.

I'm currently using

gl.glDrawElements(PGL.POINTS, indices.length, GL.GL_UNSIGNED_INT, 0);

to draw the verts as points.

I'd like to add a line to change point-size, and maybe add the possibility of antialiasing them, too. I've tried various things, but haven't been able to get it to work.

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toneburst

I'm also wondering if it would be possible to draw all the vertices just once, rather than every draw cycle, as in the example.

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nabr

for GL3
gl = ((PJOGL)beginPGL()).gl.getGL3();
gl.glPointSize(25.0);

for ES 2.0 vertexShader
gl_Pointsize=25.0

http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL3.html

toneburst

Great, thanks once again @nabr. I'll try that. I'm thinking of using OpenGL 4 because I want to try Geometry Shaders.

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nabr

Share a demo when you done :)

toneburst

@nabr I'm hoping to have some PostFX render pass classes to share.

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