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shurcool

Representing interval set with values for pixel values

5 posts in this topic

Edit: Here's an image that visualizes what I'm trying to do here...

[img]http://img163.imageshack.us/img163/2278/imagecpm.png[/img]

If you need to store some regular values (like R/G/B intensities) for your pixels, it's quite easy. Just use a colour framebuffer.

[code]vec3 ThisPixel = (value0, value1, value2); // Easy[/code]

Now, I want to store an interval set with values for my pixels. How can I do something like that?

The process of storing an interval set in memory is tricky to begin with. Because there could be a various number of intervals in the set.

[code]// Here's how you can do it in RAM

struct IntervalWithValue
{
float IntervalStart;
float IntervalEnd;
vec3 IntervalValue;
}

std::vector<IntervalWithValue> IntervalSet;

IntervalSet.push_back(IntervalWithValue(0.1, 0.3, vec3(255, 0, 0)));
IntervalSet.push_back(IntervalWithValue(0.5, 1.0, vec3(0, 255, 0)));

auto ThisPixel = IntervalSet;[/code]

I know it's probably really confusing what I want...

Let me explain it this way. Right now, it's easy to store and manipulate colour values in a colour framebuffer for each pixel.

But what if I want to store and later manipulate interval set with value (as defined in code above) for my pixel values? How can I store that in some sort of framebuffer on the GPU?

One of my thoughts was... if I know my interval sets will contain no more than 4 intervals, then perhaps I could use 4 framebuffers (or 4 textures, whatever). And define some sort of notation, like:

[code]framebuffer(Number).r = IntervalSet[Number].IntervalStart;
framebuffer(Number).g = IntervalSet[Number].IntervalEnd;
framebuffer(Number).b = IntervalSet[Number].IntervalValue;[/code]

Any other ideas? Thank you! Edited by shurcool
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What Are You Doing, Really(tm)? GPUs are in general not very well-suited to variable-length data like that. Bad for concurrency.
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I was afraid of that, but I thought it'd be worth asking anyway.

I've made an image to demonstrate what I want; added it to original post.

What I'm doing... is an experimental way of rendering non-standard images. Sure, I can go into details, but atm I want to see if this abstract graphics problem generates any interesting discussion/ideas on its own.
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Its a shame this is marked as OpenGL, because its quite easy to do in DirectX11 (albiet you wouldnt be writing to a framebuffer, but a UAV). Check out the "Linked List OIT" examples.

Actually, a quick google search returned this which is OpenGL:
http://blog.icare3d.org/2010/07/opengl-40-abuffer-v20-linked-lists-of.html
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Amazing!

Thanks for that info Digitalfragment, it looks very relevant and promising; I'm gonna look more into its details soon. I assume you were referring to [url="https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCwQFjAB&url=https%3A%2F%2Fgraphics.stanford.edu%2Fwikis%2Fcs448s-10%2FFrontPage%3Faction%3DAttachFile%26do%3Dget%26target%3DCS448s-10-11-oit.pdf&ei=CA9oT6_ZBI-RgQfS9unBCQ&usg=AFQjCNEx0bLp20q5rB_xMyFpMADpyZJPBg&sig2=FokN2XmpwHw44-EDnqaLKg"]this[/url] in the DirectX 11 world.

To those curious what I need this for, it's to extend my Non-Zero Exposure Time (i.e. Motion Blur) Rendering technique/demo. Right now, it does simple single-colour shaded non-overlapping triangles with a regular framebuffer, but if I wanna do overlapping geometry properly, I need something akin to Order-Independent Transparency. They've even mentioned Motion Blur as one of their potential future works, hehe.

You can see a WebGL version of my current Motion Blur demo here:

[url="http://www.cse.yorku.ca/~shuryork/MotionBlurTest.html"][img]http://www.cse.yorku.ca/~shuryork/WebGL_files/Motion%20Blur%20Demo.png[/img][/url]

[url="http://www.cse.yorku.ca/~shuryork/MotionBlurTest.html"]http://www.cse.yorku...onBlurTest.html[/url]
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Yeah, thats the demo I was referring to - it's a pretty awesome lead in to the things that can now be done with gpgpu.

I can see the use for it in motion blurring. Another use for it is resolving subpixel triangles without aliasing.
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